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Analysis of the Oldest Carbonate Gas Reservoir in China——New Geological Significance of the Dengying Gas Reservoir in the Weiyuan Structure, Sichuan Basin
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作者 Xiao Liang Shugen Liu +3 位作者 Shubei Wang Bin Deng Siyu Zhou Wenxin Ma 《地球科学学刊:英文版》 SCIE CAS CSCD 2019年第2期348-366,共19页
The Weiyuan Structure is the largest surface structure in the Sichuan Basin. However, the abundance of the Dengying Formation gas reservoir in the Weiyuan Structure is low. The height of the gas column is 244 m, but t... The Weiyuan Structure is the largest surface structure in the Sichuan Basin. However, the abundance of the Dengying Formation gas reservoir in the Weiyuan Structure is low. The height of the gas column is 244 m, but the integrated abundance is only 26.4%. After nearly 40 years of exploration, the Gaoshi1 Well and Moxi8 Well yielded gas flows that marked an important exploration success after the discovery of the Sinian Dengying Formation gas reservoir in the Weiyuan Structure, Sichuan Basin, Lower-Paleozoic in 1964. Combined with research examples of oil and gas migration and gas chimneys around the world, the authors used comprehensive geological-geophysical-geochemical research methods to provide a reasonable explanation of the low abundance of the gas reservoir in the Weiyuan Structure based on the surface and subsurface data. The latest research results show that(1) currently, the Weiyuan Structure is the apex of the Dengying Formation in the Mid-Sichuan Basin. The Guang’an, Longnüsi, Gaoshiti-Moxi, and Weiyuan structures are a series of traps in the Dengying Formation with gradual uplifting spill and closure points during the regional uplift of the Himalayan period. The natural gas of the Dengying Formation accumulated in different ways over a wide range and long distance in the Sichuan Basin.(2) At approximately 40 Ma, the Weiyuan area started to uplift and form the present structure, and it is the only outcropped area with the Triassic Jialingjiang Formation and Leikoupo Formation in the surface of the Sichuan Basin(except the steep structural belt in East Sichuan). Caused by the uplift and denudation, the core of the Weiyuan Structure has formed an escaping 'skylight' for natural gas. The evidence of a gas chimney includes(1) the component percentage of non-hydrocarbon gas, which decreased from the bottom to the top,(2) the pressure coefficient is normal because the gas reservoir from the Upper Sinian to the Lower Permian commonly have a normal pressure coefficient(an average of 1.0), and(3) the isotop 展开更多
关键词 SICHUAN Basin Weiyuan STRUCTURE Dengying Formation LATE reconstruction differential ACCUMULATION gas CHIMNEY
Geological significance of the former Xiong'er Volcanic Belt on the southwestern margin of the North China Craton
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作者 Guanxu CHEN Jinhai LUO +3 位作者 Huan XU Jia YOU Yifei LI Zichen CHE 《地球科学前沿:英文版》 SCIE CAS CSCD 2019年第1期191-208,共18页
The rock association of low-grade metasedimentary rocks and greenschists located within the Meso- Cenozoic Liupanshan Fault system on the southwestern margin of the North China Craton (NCC)is regarded as part of the P... The rock association of low-grade metasedimentary rocks and greenschists located within the Meso- Cenozoic Liupanshan Fault system on the southwestern margin of the North China Craton (NCC)is regarded as part of the Paleoproterozoic Xiong'er Group.These low- grade rocks are separated by normal faults,with the greenschist located in the hanging wails.Zircon LA-ICP- MS U-Pb ages of the greenschists range from 2455 to 423 Ma,suggesting that they are not Paleoproterozoic in age. The protolith ages (206-194 Ma)of the greenschists were determined by LA-ICP-MS U-Pb dating of zircons from two siltstone inteflayers.The petrology and geochemistry of the greenschists reveal that their protolith was continental tholeiitic basalt that formed in an extensional environment such as a continental rift.Thus,it is proposed that the protolith of the greenschists was a mafic volcanic rock of Late Triassic-Early Jurassic age and was metamorphosed during the Jurassic due to tectonism within the Liupanshan tectonic belt.These results show that the greenschists should be reclassified and removed from the Xiong'er Group,and explains why they differ so much from those of typical Xiong'er Group successions in other areas.The formation of the mafic volcanic rocks under conditions of continental rifting differs from that of coeval granitic rocks in the western Qinling Orogen,where the extension occurred during a post-collisional stage in the Late Triassic,which further suggests that the southwestern margin of the NCC became an extensional setting after the Late Triassic. 展开更多
关键词 southwestern MARGIN of the NCC PALEOPROTEROZOIC Xiong'er Group GREENSCHIST DETRITAL zircon U-Pb geochronology Late Triassic to Early Jurassic
A new member of Sphenopsida,Neolobatannularia gen. nov. from Late Triassic of western Liaoning,China 预览
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作者 WANG Junyou LI Tao +7 位作者 LIU Zhiping GUO Bin KANG Ai NA Yuling LI Yunfeng WANG Hongshan BO Junchen SUN Chunlin 《世界地质:英文版》 2019年第1期1-8,共8页
A new genus Neolobatannularia Sun et Li gen. nov. with the type species Neolobatannularia liaoningensis Sun et Li sp. nov. from the Upper Triassic Yangcaogou Formation of Beipiao, Liaoning, China, is described in this... A new genus Neolobatannularia Sun et Li gen. nov. with the type species Neolobatannularia liaoningensis Sun et Li sp. nov. from the Upper Triassic Yangcaogou Formation of Beipiao, Liaoning, China, is described in this paper. The new taxon is attributed to Equisetales of Sphenopsida based on its branch with internodes, node and leaves borne in whorls on nodes. It is a new member of the Mesozoic Sphenopsida. Although the new taxon shares some morphological characters with the genus Lobatannularia Kawasaki, a genus widely distributed in the Permian Cathaysia flora in East Asia, and the genus Lobatannulariopsis Yang from the Late Triassic of southwestern China, its unique branching pattern is markedly distinguished from the two known genera. Some Triassic known species of Lobatannularia may belong to the present new genus Neolobatannularia. 展开更多
关键词 Sphenopsida NEW GENUS LATE TRIASSIC Yangcaogou Formation Beipiao
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Introduction:Empire and Information in Late Imperial Chinese History
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作者 Matthew W. Mosca 《中国历史学前沿:英文版》 2019年第1期2-18,共17页
In the last few decades,empire and infbnnation have come into focus in Chinese history as concepts demanding analysis and debate in their own right.1 Neither,to be sure,were neglected in earlier studies.As the realm o... In the last few decades,empire and infbnnation have come into focus in Chinese history as concepts demanding analysis and debate in their own right.1 Neither,to be sure,were neglected in earlier studies.As the realm of the Huangdi,China between 221 BCE and 1912 is nomially tenned an empire in European languages. 展开更多
关键词 INTRODUCTION EMPIRE and INFORMATION LATE Imperial CHINESE HISTORY
没有五四,何来晚清?
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作者 王德威 《南方文坛》 CSSCI 北大核心 2019年第1期72-73,共2页
“没有晚清,何来五四?”是我论晚清小说专书《被压抑的现代性》(Fin-de-siecle Splendor:Repressed Modernities of Late Qing Fiction,1997)中文版导论的标题。长久以来,文学和政治文化史上的晚清一直被视为五四新文化运动的对立面,集... “没有晚清,何来五四?”是我论晚清小说专书《被压抑的现代性》(Fin-de-siecle Splendor:Repressed Modernities of Late Qing Fiction,1997)中文版导论的标题。长久以来,文学和政治文化史上的晚清一直被视为五四新文化运动的对立面,集颓废封建于一身。相对于此,五四则代表现代性的开端;启蒙与革命,民主与科学的号召至今不绝。 展开更多
关键词 五四新文化运动 晚清小说 民主与科学 LATE 文化史 文学 颓废 革命
Using geophysical logs to identify Milankovitch cycles and to calculate net primary productivity(NPP) of the Late Permian coals,western Guizhou,China
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作者 Zhi-Ming Yan Long-Yi Shao +2 位作者 David Large Hao Wang Baruch Spiro 《古地理学报:英文版》 CSCD 2019年第1期31-42,共12页
Milankovitch periodicities of 123 kyr(eccentricity), 35.6 kyr(obliquity), and 21.2 kyr(precession) were identified in geophysical logs of three Late Permian coals: 17#, 18#, and 17 + 18#, from the Songhe mining area i... Milankovitch periodicities of 123 kyr(eccentricity), 35.6 kyr(obliquity), and 21.2 kyr(precession) were identified in geophysical logs of three Late Permian coals: 17#, 18#, and 17 + 18#, from the Songhe mining area in western Guizhou Province. Based on the astronomic temporal framework, the periods of deposition of the 17#(5.6 m), 18#(6.4 m), and 17 + 18#(5.4 m) coals were constrained to 140.8–119.8 kyr, 160–136.2 kyr, and 135–114.9 kyr,respectively. The overall depositional period of the 18# coal of 160–136.2 kyr was further subdivided using the wavelet analysis method, into short and precise periods corresponding to the Milankovitch periodicities. It includes one eccentricity periodicity(123 kyr), three obliquity periodicities(35.6 kyr), and five precession periodicities(21.2 kyr). Different thicknesses of the subdivided coal sections, equivalent to the same time span of deposition, indicate different rates of coal deposition, i.e., thicker sections imply higher rates while the thinner sections represent lower rates. The combination of the measured average carbon concentration with the density of the coals gave rise to long-term average values of carbon accumulation rates for the Late Permian coals, in the range of 42.4–50.6 g·C·m^-2·a^-1. This range corresponds to the long-term average carbon accumulation rates for the initial peat in the range of 60.6–72.3 g·C·m^-2·a^-1. Based on the known quantitative relation between net primary productivity(NPP)values and long-term average carbon accumulation rates for the Holocene tropical peatlands, the range of NPP values for the Late Permian tropical peatlands was estimated as 242.4–433.8 g·C·m^-2·a^-1.A comparison of existing information about peatland NPP levels of various ages and latitudes indicated that when conditions of high rain and high humidity prevail in the palaeo-peatland at given latitude, the NPP rates will vary with changes in atmospheric concentration of CO2 and O2. This relationship may lead to the use of coals as an indicator 展开更多
关键词 MILANKOVITCH cycle Coal deposition PEATLAND Long-term average carbon accumulation rate Net primary productivity Late PERMIAN GUIZHOU Province
Oil exploration breakthrough in the Wensu salient, northwest Tarim Basin and its implications
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作者 ZHANG Junfeng GAO Yongjin +3 位作者 YANG Youxing ZHOU Xingui ZHANG Jinhu ZHANG Yuanyin 《石油勘探与开发:英文版》 2019年第1期16-26,共11页
Both the XWD1 and XWD2 wells drilled in 2017 in the Wensu salient, northwest Tarim Basin have achieved high-yield industrial oil flow. Based on the comprehensive research on drilling, oil testing, geochemistry and log... Both the XWD1 and XWD2 wells drilled in 2017 in the Wensu salient, northwest Tarim Basin have achieved high-yield industrial oil flow. Based on the comprehensive research on drilling, oil testing, geochemistry and logging data, in combination with the field surveys, 2 D seismic data processing and interpretation as well as sedimentation and accumulation history comparison, we carefully compared the source conditions, migration channels, reservoir-cap distribution and trapping types in the Wensu salient, and subsequently constructed a reservoir-forming pattern. Though the Wensu salient is lack of source rocks, some drainage systems were widely developed and efficiently connected to adjacent fertile depressions. Due to the moderate Miocene paleogeomorphic conditions in the Wensu salient, the delta and shore-shallow lacustrine beach bar sandy bodies were developed within the Jidike formation, and consequently form widely distributed structural-lithologic traps. The hydrocarbon generation, migration and accumulation mainly happened in the Neogene-Quaternary period, which suggests that the reservoir-forming pattern should be characterized as late-period and compound accumulation. It suggests that, although the border belts in the Tarim Basin might be short of source rocks and structural traps, they are potential to accumulate hydrocarbon in a large scale;the description of efficient hydrocarbon migration channels and structural-lithologic traps is crucial for any successful exploration. 展开更多
关键词 structural-lithologic TRAPS late hydrocarbon accumulation NEOGENE Jidike Formation weathering METAMORPHIC crust Wensu salient TARIM Basin
Interior Monologue in Katherine Mansfield’s Two Short Stories 预览
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作者 李清 《海外英语》 2019年第2期192-193,共2页
Katherine Mansfield is a central figure in the development of the modern short story.Among modernist techniques of novels in the 20th century,interior monologue plays a significant role.Katherine Mansfield was the fir... Katherine Mansfield is a central figure in the development of the modern short story.Among modernist techniques of novels in the 20th century,interior monologue plays a significant role.Katherine Mansfield was the first writer to use it consciously as a literary device.Her frequent and skillful use of interior monologue not only makes her works more unique and more attractive but also leaves a deep influence upon many writers.This paper mainly introduces interior monologue in her two famous short stories——The Daughters of the Late Colonel and Life of Ma Parker,in order to make readers have a better appreciation of Mansfield’s flexible use of interior monologue and comprehend her love and hatred towards society and her contemporaries. 展开更多
关键词 Katherine MANSFIELD SHORT STORIES modernist techniques INTERIOR MONOLOGUE The Daughters of the LATE Colonel Life of Ma Parker
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Discovery of Kilometer-Scale Uplift and Exhumation Related to the Late Indosinian Movement in the Northern Ordos Basin,North China 预览
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作者 ZHANG Long LIU Chiyang HE Xiaoyuan 《地质学报:英文版》 SCIE CAS CSCD 2019年第1期231-232,共2页
The tectonic response of the Ordos Basin to Indosinian movement mainly occurred in the southwestern part of the basin due to the Late Triassic collisional Qinling orogeny to the south.The orogeny resulted in intense u... The tectonic response of the Ordos Basin to Indosinian movement mainly occurred in the southwestern part of the basin due to the Late Triassic collisional Qinling orogeny to the south.The orogeny resulted in intense uplift and exhumation of the southwestern section of the Ordos Basin,where the upper and middle parts of the Upper Triassic Yanchang Formation were exhumated and the magnitude of exhumation progressively decreased to the northeast(Liu Chiyang et al.,2008).However,little attention has been paid to the influence of Indosinian movement to the northern Ordos Basin.In this study,stratigraphic observations and new apatite fission track(AFT)data are integrated to characterize the effect of Indosinian movement in the northern Ordos Basin. 展开更多
关键词 LATE TRIASSIC SOUTHWESTERN progressively
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Exploration and Sources of Bauxite Deposit in the Boloven Plateau, Southern Laos
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作者 Yongzhen Long Xiaoyong Yang +1 位作者 Mu Yang Dexian Zhang 《地球科学学刊:英文版》 SCIE CAS CSCD 2019年第1期121-130,共10页
The Boloven bauxite deposit occurs either in the weathered basalt(alkali basalt and tholeiite), or in the Cretaceous sandstone. It is generally agreed that the bauxite deposits/laterites overlying the alkali basalt an... The Boloven bauxite deposit occurs either in the weathered basalt(alkali basalt and tholeiite), or in the Cretaceous sandstone. It is generally agreed that the bauxite deposits/laterites overlying the alkali basalt and tholeiite were derived from weathering of underlying basalt, however, the origin of bauxite deposit overlying the sandstone remains controversial. Chondrite-normalized REE patterns show that the bauxite ores/laterites overlying the sandstone exhibit quite similar chondrite-normalized REE patterns to those overlying the alkali basalt. Diagram of Al-Ti-Zr shows that the bauxite ores/laterites overlying the sandstone, tholeiite and alkali basalt are close to each other and to the calc-alkaline suite, however, significantly different from the sandstone and shales. Binary diagram of log Nb/Y vs log Zr/Ti further indicates that the parent rocks of bauxite ores/laterites overlying the sandstone belong to the suit of ultra-alkali to alkali basalt. Multivariate statistical analysis of geochemical data exhibit that the geochemical characteristics of HREE, Y, LREE and Al2O3 for bauxite ores/laterites overlying the sandstone are similar to those overlying the alkali basalt(15.7 Ma), obviously different from those overlying the tholeiite(1.2 to 0.5 Ma). Consequently, it can be inferred that the bauxite deposits/laterites overlying the sandstone were derived from the alkali basalt. 展开更多
关键词 late ritic-type BAUXITE XRD DATUM processing EXPLORATION SOURCES Boloven PLATEAU Laos
Embellishing Appearances with Fragrant Cosmetic Cases:Transforming Women's Bodies to Nourish Life in the Late Ming
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作者 Xiaoqian Ji 《中国历史学前沿:英文版》 2019年第1期137-162,共26页
Through a close examination of late Ming publisher Hu Wenhuan's Embellishing Appearances with Fragrant Cosmetic Cases,this article shows how beautification techniques became part of the culture of nourishing life.... Through a close examination of late Ming publisher Hu Wenhuan's Embellishing Appearances with Fragrant Cosmetic Cases,this article shows how beautification techniques became part of the culture of nourishing life.Hu encouraged women to make and use cosmetics as a way of practicing womanly work.For men,these techniques became a means of investigating things and cultivating the self.Hu's text is an example of amateur experimentation involving medical knowledge in late imperial China that went beyond proprietary expertise.The practice-oriented recipes in Fragrant Cosmetic Cases helped readers to translate written knowledge into practical knowledge,and to circulate them to a broad group of users that included women,the less literate,and even the illiterate.By the early seventeenth century,what Hu marketed as knowledge to nourish the lives of women had become common knowledge for male elites. 展开更多
关键词 nourishing LIFE the body WOMEN medicine KNOWLEDGE LATE Ming
Complications of proximal hypospadias repair with transverse preputial island flap urethroplasty: a 15-year experience with long-term follow-up
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作者 Chao-Xu Wang Wei-Ping Zhang Hong-Cheng Song 《亚洲男性学杂志:英文版》 SCIE CAS CSCD 2019年第3期300-303,共4页
There is still debate regarding the optimal surgical approach for proximal hypospadias. This retrospective study aims to evaluate the long-term outcomes using transverse preputial island flap urethroplasty. A total of... There is still debate regarding the optimal surgical approach for proximal hypospadias. This retrospective study aims to evaluate the long-term outcomes using transverse preputial island flap urethroplasty. A total of 320 patients were included, with a mean follow-up of 40.2 months (range: 1–156 months). Complications were encountered in 125 patients (39.1%), including fistulas in 53 (16.6%), urethral strictures in 31 (9.7%), and diverticula in 41 (12.8%). The mean timing of presentation with a complication was 15.8 months (median: 1.7, range: 1–145), of which 79.2% were early complications and 20.8% were late complications. In all, 20.8% of the patients with complications presented after ≥1 year, and 12.8% presented after ≥5 years. Univariate analysis revealed that age at the time of surgery, flap length, and location of the urethral meatus were not correlated with complications. A stricture was present in 31.7%(13/41) of those with diverticula (P < 0.001), while late urethral diverticula were accompanied by urethral strictures in 11.1%(1/9) of cases (P = 0.213). These results indicate that transverse preputial island flap urethroplasty still has a high incidence of complications, even when performed by highly experienced physicians. Most complications of hypospadias are diagnosed within 1 year postoperatively, while fistulas and urinary strictures generally occur within 2 months and diverticula tend to be present by 1 year. 展开更多
关键词 DIVERTICULUM fistula follow-up HYPOSPADIAS late COMPLICATIONS URETHRAL STRICTURE
Two cases of variant late infantile ceroid lipofuscinosis in Jordan 预览
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作者 Omar Nafi Bashar Ramadan +2 位作者 Olaf Riess Rebecca Buchert Tawfiq Froukh 《世界临床病例杂志》 2019年第2期203-208,共6页
BACKGROUND Late infantile ceroid lipofuscinosis is a rare neurodegenerative disorder that appears between the ages of 2 and 4 years and is difficult to diagnose.In this report we present two sisters with this conditio... BACKGROUND Late infantile ceroid lipofuscinosis is a rare neurodegenerative disorder that appears between the ages of 2 and 4 years and is difficult to diagnose.In this report we present two sisters with this condition,and the clinical course consisted of delayed developmental skills initially and later regression of previously acquired skills.The cases were initially considered as childhood disintegrative disorder(CDD);however,when whole exome sequencing(WES)genetic testing was done,they proved to be variant late infantile ceroid lipofuscinosis.This is the first report from Jordan.CASE SUMMARY Clinical presentation included developmental delay and initially speech delay,followed by lose of sphincter control.Motor development was normal until 4 years of age,then they developed ataxia(fear of going downstairs)and weakness while walking.Atonic and myoclonic seizures become intractable,and this was followed by inability to stand or sit and loss of expressive language.In addition to complete blood count test,liver function test,kidney function test,serum electrolyte test,and blood sugar test,serum amino acid profile,B12 level test,thyroid function test,and a brain computed tomography scan were also normal.An electroencephalogram showed a generalized spike and wave pattern,and magnetic resonance imaging showed little to no abnormalities.After dealing with the cases as CDD,WES testing proved a final diagnosis of variant late infantile ceroid lipofuscinosis.Current treatment is anti-epileptic drugs and supportive care at home,and they are now in vegetative state.CONCLUSION This report highlights the importance of WES for the identification of genetic diseases,especially neurodegenerative disorders. 展开更多
关键词 Ceroid lipofuscinosis Childhood disintegrative disorder LYSOSOMAL storage DISORDERS NEURODEGENERATIVE DISORDERS VARIANT LATE INFANTILE Case report
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Evaluation of Cold Dew Wind Monitoring Precision for Late Rice Based on CLDAS Data in Guangxi 预览
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作者 Yanli CHEN Yan HE +1 位作者 Jianfei MO Yongming LUO 《农业生物技术:英文版》 CAS 2019年第1期194-198,共5页
The low temperature process of cold dew wind(from September 19 to 27 in 2011)for late rice production was dynamically monitored by using CLDAS temperature,combined with the background information of rice cultivation f... The low temperature process of cold dew wind(from September 19 to 27 in 2011)for late rice production was dynamically monitored by using CLDAS temperature,combined with the background information of rice cultivation from multi-source satellite database together with an reference to the monitoring indexes of cold dew wind disaster to verify the precision of CLDAS data,so as to provide a reference for monitoring chilling damage caused by cold dew wind in late rice production in Guangxi.The results showed that the cold wind dew caused heavy damage to an area of 3 159.76 km 2,moderate damage to an area of 559.77 km 2 and light damage to an area of 2 452.14 km 2.The correlation coefficients between CLDAS inversion temperature and actual temperature of 12 verification meteorological stations were all larger than 0.93,and the difference in daily average temperature was 0.3℃.The time difference between maximum and minimum temperature provided by CLDAS and corresponding actual temperature from 12 meteorological stations was less than 1 h.The temperature data provided by CLDAS was in accordance with actual temperature data.With an advantage of rapidly,minutely and accurately monitoring the grade distribution of local cold dew wind disaster for late rice,CLDAS can be used in monitoring cold dew wind in late rice production in Guangxi. 展开更多
关键词 Cold DEW WIND LATE rice CLDAS REMOTE SENSING GUANGXI
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Re-Defining the Late Qing Revolution:Its Continuity with the Taiping Rebellion,Radical Student Politics and Larger Global Context
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作者 Lin Shaoyang 《中国历史学前沿:英文版》 2018年第4期531-557,共27页
Studies in recent decades conducted from the angle of provincial-level local self-government have done much to help relativize narratives of the 1911 Revolution in China that emphasize the importance of armed uprising... Studies in recent decades conducted from the angle of provincial-level local self-government have done much to help relativize narratives of the 1911 Revolution in China that emphasize the importance of armed uprisings.However, these endeavors still have room to locate the revolution within a global context and to understand its implications as a revolution conducted through the conduits of culture and thought.More importantly,these existing studies are also insufficient in terms of viewing the Late Qing Revolution through a longer time span to see the Revolution as the new development and continuity of a much longer revolution that began with the Taiping Rebellion (1851-64).The Taiping Rebellion substantially weakened the rule of the Qing court.In other words,this author regards the Late Qing Revolution as a part of the long revolution starting from the outbreak of the Taiping Rebellion.Through this analysis,the author demonstrates how the Late Qing Revolution was comprised of three key components:armed uprisings,self-government movements,and finally,a revolution through words and culture including the student movements at home and in Tokyo.It argues that,to a certain degree,it is the Taiping Rebellion that made the Revolution successful in a relatively pacifistic way,and that,in particular,made possible the non-violent revolutions of self-government and the revolution through words and culture. 展开更多
关键词 the Taiping REBELLION and LATE QING REVOLUTION the LATE QING REVOLUTION of culture and thought self-government the STUDENT POLITICS the REBELLION by genteel scholars(xiucai)
Georgia and Europe in the Early Middle Ages 预览
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作者 Bejan Javakhia 《文学与艺术研究:英文版》 2018年第12期1702-1712,共11页
The article deals with relations of Georgia to Europe in the late antique period and the early Middle Ages.The analyses rests on the Byzantium and the Western European,as well as on Georgian written sources:historical... The article deals with relations of Georgia to Europe in the late antique period and the early Middle Ages.The analyses rests on the Byzantium and the Western European,as well as on Georgian written sources:historical chronicles,hagiographic texts and other information,reflecting political relations of the Iberia and Lazika—those-days kingdoms,located on the territory of Georgia—to the Western European and Byzantine space.The offered analysis will concentrate on the shared characteristics of European space in the Middle Ages and will compare them to the general tendencies of development of Georgia in the same period.This enables to draw conclusion that Georgia was the part of the unified Christian space of the early Middle Ages. 展开更多
关键词 Georgia EUROPE MIDDLE AGES LATE ANTIQUE
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Stratigraphy of late Quaternary deposits in the mid-western North Yellow Sea 预览
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作者 陈晓辉 李日辉 +1 位作者 蓝先洪 王燕 《海洋湖沼学报(英文)》 SCIE CAS CSCD 2018年第6期2130-2153,共24页
The North Yellow Sea(NYS)is characterized by strong land-sea interaction and paleo-environmental changes with sea-level fluctuations during the late Quaternary.However,large-time scale depositional stratigraphy in thi... The North Yellow Sea(NYS)is characterized by strong land-sea interaction and paleo-environmental changes with sea-level fluctuations during the late Quaternary.However,large-time scale depositional stratigraphy in this area and its relationship with sea-level changes remain unresolved.High-resolution seismic profiles from NYS were subdivided into eleven seismic units(U1 to U11 in descending order).A 70.6-m-long borehole(DLC70-2)from localities on seismic profiles,analyzed for lithology,microfossil assemblages and geochronology,comprises eleven sedimentary units(D1 to D11 in descending order),which were clearly correlated with the eleven seismic units.These units constitute four distinctive sequences(SQ1 to SQ4 from top to bottom)bounded by three sequence boundaries(S3,S5 and S10)with obvious depositional hiatus,correlated with sea-level lowstands of MIS2,MIS4 and MIS6,respectively.The lowermost SQ4 below S10,has been identified only upper part of transgressive systems tract(TST)(D11,tidal flat facies in early MIS6).SQ3 overlying S10 consists of a set of lowstand systems tracts(LST)(D10,fluvial to incised-channel filling facies in late MIS6),TST and highstand systems tracts(HST)(D9 to D6,interactive deposits of neritic and littoral facies in MIS5 and early MIS4).SQ2 above S5 is composed of LST(D5,channel-filling facies in late MIS4)and TST(D4,littoral to estuary facies in early-middle MIS3),but lack of HST resulting from subaerial exposure and channel incising during the Last Glacial Maximum(LGM).The uppermost SQ1 overlying S3 comprises LST(D3,channel-filling to flooding plain or marsh facies in MIS2),Holocene TST(D2,littoral and tidal sand ridge facies)and HST(D1,neritic facies).The unusual depositional stratigraphy was largely dominated by sea-level fluctuations and the Bohai Strait topography.This study confirms that TSTs are relative continuous and widely distributed,while LSTs vary considerably in thickness and lateral extent since MIS6 in NYS. 展开更多
关键词 LATE QUATERNARY seismic STRATIGRAPHY North Yellow Sea SEA-LEVEL fl uctuation
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A New Ootype of Dinosaur Egg (Faveoloolithidae: Duovallumoolithus shangdanensis oogen, et oosp. nov.) from the Late Cretaceous in the Shangdan Basin, Shaanxi Province, China 预览
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作者 ZHENG Tingting BAI Yi +5 位作者 WANG Qiang ZHU Xufeng FANG Kaiyong YAO Yuan ZHAO Yongqiang WANG Xiaolin 《地质学报:英文版》 SCIE CAS CSCD 2018年第3期897-903,共7页
A new ootype collected from the Upper Cretaceous Lijiacun Formation in the Shangdan Basin,Shaanxi Province is described in this paper. Based on general external shape, size, eggshell thickness andhoneycomb-like eggshe... A new ootype collected from the Upper Cretaceous Lijiacun Formation in the Shangdan Basin,Shaanxi Province is described in this paper. Based on general external shape, size, eggshell thickness andhoneycomb-like eggshell microstructure, eggs are referable to the oofamily Faveoloolithidae. Comparedwith other members of Faveoloolithidae, specimens described in this paper show special characteristics:adjacent pores are usually separated by two eggshell units between which often develop interspaces;columnar eggshell units are relatively closely arranged in radial view. According to these characteristics,we erect a new oogenus and a new oospecies: Duovallumoolithus shangdanensis oogen, et oosp. nov. Thenew discovery expands the diversity of Faveoloolithidae. 展开更多
关键词 DINOSAUR EGG Faveoloolithidae Late CRETACEOUS Shangdan BASIN SHAANXI Province China
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The Late Triassic I-Type Granites from the Longmu Co-Shuanghu Suture Zone in the interior of Tibetan Plateau, China: Petrogenesis and Implication for Slab Break-Off 预览
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作者 ZHAO Zhen WU Zhenhan +2 位作者 LU Lu YU Junqiu WU Yanjun 《地质学报:英文版》 SCIE CAS CSCD 2018年第3期935-951,共17页
The Jiangaidarina granitic mass (JM) is an important part of the magmatic belt in Longmu Co-Shuanghu Suture Zone (LSSZ) in the central Tibetan Plateau. An integrated research involving whole-rock geochemistry, zir... The Jiangaidarina granitic mass (JM) is an important part of the magmatic belt in Longmu Co-Shuanghu Suture Zone (LSSZ) in the central Tibetan Plateau. An integrated research involving whole-rock geochemistry, zircon LA-ICP-MS U-Pb ages and Hf isotopic compositions was carried out to definethe timing, genesis and tectonic setting of the JM. Zircon LA-ICP-MS U-Pb ages have been obtainedranging from 210 to 215 Ma, rather than the Early Jurassic as previously thought. Fifteen granite samplescontain hornblendes and show a negative correlation between P2O5 and SiO2, indicating that the JM is an I-type granite. All the granites are enriched in LREE relative to HREE, with negative En anomalies (Eu/Eu*=0.56-0.81), and have similar trace elements patterns, with depletion of Ba, Nb, Sr and P. Thesesuggest that the JM was fractionated, and this is also proved by the characteristic of negative correlationsbetween oxide elements (TiO2, MgO, FeOt, MnO, CaO) and SiO2. Almost all εHf(t) values of the granitesare between -10.3 and -5.8, implying that the JM has a crustal source intimately related with the SouthQiangtang Block (SQB), except for one (+10.2), showing a minor contribution from mantle source.Moreover, relatively low Na20/K20 ratios (0.42-0.93) and high A/CNK values (0.91-1.50) reflect that theJM was predominately derived from the medium-high potassium basaltic crust, interacted withgreywacke. Our new geochemical data and geochronological results imply that the Late Triassic magmaswere generated in a post-collisional tectonic setting, probably caused by slab break-off of the Longmu Co-Shuanghu Tethyan Ocean (LSTO). This mechanism caused the asthenosphere upwelling, formedextension setting, offered an enormous amount of heat, and provided favorable conditions foremplacement of voluminous felsic magmas. Furthermore, the LSTO could be completely closed during theMiddle Triassic, succeed by continental collision and later the slab broke off in the Late Triassic. 展开更多
关键词 the Late TRIASSIC I-TYPE granite slab break-off Longmu Co-Shuanghu SUTURE TIBETANPLATEAU China
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Late Cenozoic Sedimentary Evolution of Pagri-Duoqing Co graben, Southern End of Yadong-Gulu Rift, Southern Tibet 预览
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作者 HA Guanghao WU Zhonghai +1 位作者 HE Lin WANG Shubing 《地质学报:英文版》 SCIE CAS CSCD 2018年第3期972-987,共16页
The north trending rifts in southern Tibet represent the E-W extension of the plateau andconfirming the initial rifting age is key to the study of mechanics of these rifts. Pagri-Duoqing Co graben islocated at souther... The north trending rifts in southern Tibet represent the E-W extension of the plateau andconfirming the initial rifting age is key to the study of mechanics of these rifts. Pagri-Duoqing Co graben islocated at southern end of Yadong-Gulu rift, where the late Cenozoic sediments is predominately composedof fluvio-lacustrine and moraine. Based on the sedimentary composition and structures, the fluvio-lacustrine could be divided into three facies, namely, lacustrine, lacustrine fan delta and alluvial fan. Thepresence of paleo-currents and conglomerate components and the provenance of the strata around thegraben indicate that it was Tethys Himalaya and High Himalaya. Electron spin resonance (ESR) dating andpaleo-magnetic dating suggest that the age of the strata ranges from ca. 1.2 Ma to ca. 8 Ma. Opticallystimulated luminescence (OSL) dating showed that moraine in the graben mainly developed from around181-109 ka (late Middle Pleistocene). Combining previous data about the Late Cenozoic strata in otherbasins, it is suggested that 8-15 Ma may be the initial rifting time. Together with sediment distribution anddrainage system, the sedimentary evolution of Pagri could be divided into four stages. The graben rifted ataround 15-8 Ma due to the eastern graben-boundary fault resulting in the appearance of a paleolake.Following by a geologically quiet period about 8-2.5 Ma, the paleolake expanded from east to west ataround 8-6 Ma reaching its maximum at ca. 6 Ma. Then, the graben was broken at about 2.5 Ma. At last,the development of the glacier separated the graben into two parts that were Pagri and Duoqing Co sincethe later stages of the Middle Pleistocene. 展开更多
关键词 north trending RIFTS initial RIFTING age Late Cenozoic strata sedimentary evolution OSL ESR and PALEOMAGNETIC dating Tibet China
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