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福建黄塘晚侏罗世长林组硅质岩地球化学特征及其沉积环境意义
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作者 张金虎 金春爽 +5 位作者 徐立明 王海荣 杨玉茹 邓克 高永进 吴兆剑 《地学前缘》 EI CAS CSCD 北大核心 2019年第3期190-201,共12页
福建黄塘地区晚侏罗世长林组发育一套层状硅质岩,夹薄层凝灰岩,产硅质海绵骨针和硅质钙藻,其硅质岩沉积环境复杂,成因一直存在不同认识。本文通过野外地质调查和岩相学研究,以及主量元素、稀土元素和微量元素分析认为,该区硅质岩为非纯... 福建黄塘地区晚侏罗世长林组发育一套层状硅质岩,夹薄层凝灰岩,产硅质海绵骨针和硅质钙藻,其硅质岩沉积环境复杂,成因一直存在不同认识。本文通过野外地质调查和岩相学研究,以及主量元素、稀土元素和微量元素分析认为,该区硅质岩为非纯硅质岩,在Fe-Mn-Al三角图中样品位于生物成因区及附近,Mo和V含量富集、轻稀土富集、Eu弱负异常及U/Th值也都具有典型的生物成因特征,且微观特征显示其受到火山活动的影响。黄塘硅质岩在Fe2O3/TiO2Al2O3/(Al2O3+Fe2O3)、TFe2O3/(100-SiO2)Al2O3/(100-SiO2)和(La/Ce)NAl2O3/(Al2O3+Fe2O3)图解中都投在了大陆边缘及附近。ΣREE值较高、Ceanom值、MnO/TiO2值及(La/Yb)N值等这些地球化学指标一致表明黄塘硅质岩处于受陆源物质影响的大陆边缘浅海沉积环境。在前人研究基础上,认为研究区在晚侏罗世早期开始发生海侵并伴有小规模的火山活动,整体为还原环境,局部可能水体较深,为进一步开展福建、浙江地区的石油地质评价工作提供了依据。 展开更多
关键词 中国东南部 长林组 硅质岩 地球化学 沉积环境
中国东南部晚中生代基性岩脉地幔源区的岩性演化历史
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作者 雷祝梁 曾罡 +1 位作者 王小均 陈立辉 《地球科学》 EI CAS CSCD 北大核心 2019年第4期1159-1170,共12页
中国东南部晚中生代的岩浆活动被认为与古太平洋板块的俯冲作用密切相关,而板块的俯冲作用又势必会对地幔的性质产生重要影响.晚中生代基性岩脉在中国东南部尤其是沿海地区广泛分布,为揭示中国东南部地幔演化历史及其与古太平洋板块俯... 中国东南部晚中生代的岩浆活动被认为与古太平洋板块的俯冲作用密切相关,而板块的俯冲作用又势必会对地幔的性质产生重要影响.晚中生代基性岩脉在中国东南部尤其是沿海地区广泛分布,为揭示中国东南部地幔演化历史及其与古太平洋板块俯冲之间的潜在成因联系提供了理想的研究对象.因此,对湘、赣、浙、闽、粤五省基性岩脉的年代学和地球化学数据进行了总结,通过恢复它们的原始岩浆组成,厘定其地幔源区岩性,揭示了研究区地幔的岩性演化历史.研究发现,中国东南部晚中生代基性岩脉的源区岩性在地域上没有显著差异,在时间尺度上表现出明显变化.在150~110Ma期间,中国东南部地幔源区的岩性包含富硅辉石岩和贫硅辉石岩两类;而在110~64Ma期间,地幔源区的主体岩性转变为贫硅辉石岩,伴随部分橄榄岩.基于上述地幔岩性的演化规律,并结合前人对研究区基性玄武岩的研究工作,认为研究区晚中生代地幔的岩性转变主要受控于古太平洋板块的俯冲过程,是板块俯冲角度改变的结果. 展开更多
关键词 基性岩脉 原始岩浆 源区岩性 古太平洋板块 中国东南部 岩石学
绿色希望金色理想百年沉淀与时俱进——白云山下珠江水畔的华南农业大学
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作者 朱鹏辉 曹伟 《中外建筑》 2019年第4期10-16,共7页
1前言羊城广州地处中国东南部,位于珠三角核心地带,其重要水系为珠江,孕育着广州一代又一代的人才,凝聚浓厚的水文化;广州是中国最早的一批沿海开放城市之一,这座城市经济发达,历史文化浓厚,是现代与历史融合的一座魅力都市。华南农业大... 1前言羊城广州地处中国东南部,位于珠三角核心地带,其重要水系为珠江,孕育着广州一代又一代的人才,凝聚浓厚的水文化;广州是中国最早的一批沿海开放城市之一,这座城市经济发达,历史文化浓厚,是现代与历史融合的一座魅力都市。华南农业大学(下简称"华农")正是位于羊城白云山下珠江水畔的一座百年高校,本文所讲述的华南农业大学具体所指天河区的五山校区,占地面积294hm^2,校园内充满了景观、建筑和文化的特色美。 展开更多
关键词 华南农业大学 白云山 与时俱进 江水 中国东南部 沉淀 理想 金色
美国西部红层地貌发育及与中国东南部丹霞地貌的对比 被引量:1
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作者 潘志新 任舫 彭华 《地理研究》 CSSCI CSCD 北大核心 2018年第12期2399-2410,共12页
美国西部和中国东南部都是世界上中生代红层的主要分布区,形成了以赤壁丹崖为特征的地貌景观,具有很高的对比研究价值。通过地质资料分析和野外考察,对美国西部红层的分布和形成年代,地质构造背景,岩性和地貌特征等进行梳理,并和中国东... 美国西部和中国东南部都是世界上中生代红层的主要分布区,形成了以赤壁丹崖为特征的地貌景观,具有很高的对比研究价值。通过地质资料分析和野外考察,对美国西部红层的分布和形成年代,地质构造背景,岩性和地貌特征等进行梳理,并和中国东南部丹霞地貌进行对比。结果表明:美国西部红层地貌和中国东南部丹霞地貌都是发育在红层基础上的侵蚀地貌,都有显著的红色陡崖坡,但受控于区域地质构造、物质基础、及主导外营力等因素的差异,两地具体的地貌特征并不完全一致。美国西部红层主要形成于三叠纪和侏罗纪,红层堆积的构造环境为大型弧后盆地,沉积环境复杂多变,以陆相为主,尤以风沙沉积最为典型,岩性以细砂-粉砂岩和泥岩为主,砾岩很少,主导外营力为流水下切,红层发育的地貌类型相对单一,总体以高原-峡谷景观为主。中国东南部丹霞地貌区的红层多形成于白垩纪,构造环境为内陆中小型断陷/拗陷盆地,沉积环境全部为陆相,以粗碎屑混杂堆积为主,主导外营力以流水冲刷侧蚀为主,发育的地貌类型较为多样,整体以簇群式峰丛-峰林景观为主。 展开更多
关键词 红层 丹霞地貌 美国西部 中国东南部 对比研究
Two centuries of April-July temperature change in southeastern China and its influence on grain productivity
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作者 Jiangfeng Shi Jinbao Li +7 位作者 David D. Zhang Jingyun Zheng Shiyuan Shi Quansheng Ge Harry F. Lee Yesi Zhao Jie Zhang Huayu Lu 《科学通报:英文版》 SCIE EI CSCD 2017年第1期40-45,共6页
China is a traditional agriculture based country and one main region for crop production is southeastern China where temperature is a dominant climate variable affecting agriculture. Temperature and social disturbance... China is a traditional agriculture based country and one main region for crop production is southeastern China where temperature is a dominant climate variable affecting agriculture. Temperature and social disturbances both influence crop production, yet distinguishing their relative impacts is difficult due to a lack of reliable, high-resolution historical climatic records before the very recent period. Here we present the first tree-ring based warm-season temperature reconstruction for southeastern China, a core region of the East Asian monsoon, for the past 227 years. The reconstruction target was April-July mean temperature, and our model explained 60.6% of the observed temperature variance during 1953–2012.Spatial correlation analysis showed that the reconstruction is representative of April-July temperature change over most of eastern China. The reconstructed temperature series agrees well with China-scale(heavily weighted in eastern China) agricultural production index values quite well at decadal timescales.The impacts of social upheavals on food production, such as those in the period 1920–1949, were confirmed after climatic influences were excluded. Our study should help distinguish the influence of social disturbance and warm-season temperature on grain productivity in the core agricultural region of China during the past two centuries. 展开更多
关键词 中国东南部 温度变化 粮食产量 气候变化影响 传统农业 作物生产 中国东部 粮食生产
Governance for A Better Future
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《北京周报:英文版》 2017年第34期22-23,共2页
关键词 治理 中国共产党 中国东南部 俄罗斯 副部长 委员会 福建省 金砖
Geochemistry,petrogenesis and tectonic significance of the late Triassic A-type granite in Fujian,South China
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作者 Dawei Cai Jingyu Zhao +3 位作者 Yong Tang Hui Zhang Yunlong Liu Zhenghang Lv 《中国地球化学学报:英文版》 EI CAS CSCD 2017年第2期166-180,共15页
The late Permian–Triassic granites in southeastern China have important tectonic significance for the evolution of South China. Here, we present the detailed geochronological, geochemical and petrological analyses fo... The late Permian–Triassic granites in southeastern China have important tectonic significance for the evolution of South China. Here, we present the detailed geochronological, geochemical and petrological analyses for the Jinlongyan(JLY) granite in northwest Fujian Province, southeast China. LA–ICP–MS zircon U–Pb dating yielded a weighted average ~(206)Pb/~(238)U age of 224.1 ±3.3 Ma. The granite is mainly comprised of K-feldspar,plagioclase, quartz, biotite and minor amphibole. It is characterized by enrichments in Rb, Th, REEs(total REE = 295.1–694.3 ppm), and HFSEs(e.g., Zr = 289–520 ppm, Hf = 9.3–15.0 ppm, Y = 36.2–68.2 ppm) but depletions in Ba, Sr, Eu and Ti. The granite is metaluminous to weakly peraluminous and show a clear A-type granite geochemical signature with high SiO_2(70.89 wt%–75.76 wt%), total alkalis(Na_2O + K_2O = 7.51 wt%–8.72 wt%), Ga/Al ratios(10000 Ga/Al = 2.72–3.43). Insitu zircon Hf isotope analysis shows their eHf(t) values ranging from-7.2 to-3.2, with Mesoproterozoic T2DM ages(1308–1525 Ma). Whole-rock Nd isotope data show their eNd(t) values in the range of-9.5 to-9.1 and yield paleoproterozoic TDMages(1606–1985 Ma). These characteristics indicate that the JLY A-type granite magma was formed by the partial melting of Meso-Paleoproterozoic crust rocks in the Cathaysia Block. Our study of the JLY A-type granite, together with other Triassic A-type granitesin South China, defines an extensional environment in the late Triassic which probably was caused by the collision of the South China Block with Indochina Block. 展开更多
关键词 中国南方地区 A型花岗岩 构造意义 晚三叠世 福建省 地球化学特征 中国东南部 家用净水器
Response of gaseous carbon emissions to low-level salinity increase in tidal marsh ecosystem of the Min River estuary,southeastern China
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作者 Minjie Hu Hongchang Ren +3 位作者 Peng Ren Jiabing Li Benjamin J.Wilson Chuan Tong 《环境科学学报:英文版》 SCIE EI CAS CSCD 2017年第2期210-222,共13页
尽管河口潮汐的沼泽地是到进空气的温室气体的排放的重要贡献者,在二氧化碳之间的关系(公司 <sub>2</sub>), 甲烷(关于河口沼泽地, CH <sub>4</sub>) 排放,和环境因素没彻底地被澄清。这研究调查了从一块淡... 尽管河口潮汐的沼泽地是到进空气的温室气体的排放的重要贡献者,在二氧化碳之间的关系(公司 <sub>2</sub>), 甲烷(关于河口沼泽地, CH <sub>4</sub>) 排放,和环境因素没彻底地被澄清。这研究调查了从一块淡水沼泽地和在东南的中国,以及他们的大小位于一个副热带的河口的一块略有盐味的沼泽地控制公司 <sub>2</sub> 和 CH <sub>4</sub> 的排放的关键因素。学习时期的持续时间是到 2014 年 10 月的 2013 年 11 月。与从二块沼泽地的 <sub>4</sub> 排出物显示出的实验, CO <sub>2</sub> 和 CH 读季节的领域和孵化相关变化。从两块沼泽地的公司<sub>2</sub>和 CH <sub>4</sub>排出物与空气/土壤温度表明了重要积极关联( p ?</sup>并且那么<sub>4</sub><sup>2?</sup>( p ?在在副热带的河口的淡水和略有盐味的沼泽地之间的 2 </sub>排出物,而在在二个地点之间的 CH <sub>4</sub>排出物有差别( p ?从河口淡水沼泽地的 4 </sub>排出物,这些因素关于 incr 在 CO <sub>2</sub>排出物上有小效果这研究的调查结果能为沿着不同咸度坡度估计河口沼泽地的全球温暖贡献有重要含意。 展开更多
关键词 二氧化碳排放量 沼泽湿地 闽江河口 中国东南部 盐度梯度 生态系统 CH4排放 底层
China's Approach to Global Governance
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《北京周报:英文版》 2017年第36期46-47,共2页
关键词 中国东南部 治理 Robert 福建省 NAR
BRICS: APowerful Voice
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《中国与非洲:英文版》 2017年第9期18-19,共2页
关键词 金砖 中国东南部 声音 国家领导人 伙伴关系 厦门市 福建省 南非
Impact of assimilating Taiwan's coastal radar radial velocity on forecasting Typhoon Morakot (2009) in southeastern China using a WRF-based EnKF
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作者 YUE Jian MENG ZhiYong 《中国科学:地球科学英文版》 SCIE EI CAS CSCD 2017年第2期315-327,共13页
This study explores for the first time the impact of assimilating radial velocity(Vr)observations from a single or multiple Taiwan's coastal radars on tropical cyclone(TC)forecasting after landfall in the Chinese ... This study explores for the first time the impact of assimilating radial velocity(Vr)observations from a single or multiple Taiwan's coastal radars on tropical cyclone(TC)forecasting after landfall in the Chinese mainland by using a Weather Research and Forecasting model(WRF)-based ensemble Kalman filter(EnKF)data assimilation system.Typhoon Morakot(2009),which caused widespread damage in the southeastern coastal regions of the mainland after devastating Taiwan,was chosen as a case study.The results showed that assimilating Taiwan's radar Vr data improved environmental field and steering flow and produced a more realistic TC position and structure in the final EnKF cycling analysis.Thus,the subsequent TC track and rainfall forecasts in southeastern China were improved.In addition,better observations of the TC inner core by Taiwan's radar was a primary factor in improving TC rainfall forecast in the Chinese mainland. 展开更多
关键词 东南沿海地区 中国东南部 预测模型 径向速度 WRF 台湾 雷达 吸收
“宜兴青瓷”及相关问题研究 预览
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作者 周少华 《江苏陶瓷》 CAS 2017年第B10期8-13,共6页
中国是一个由多元文明组成且有着5000年延续不断灿烂文明史的国家,以环太湖为中心的地区被考古学家苏秉琦先生称为中国东南部文明起源的中心,著名的“马家滨文化”、“良渚文化”相继诞生于此.“马家浜文化”主要分布在太湖流域,南达浙... 中国是一个由多元文明组成且有着5000年延续不断灿烂文明史的国家,以环太湖为中心的地区被考古学家苏秉琦先生称为中国东南部文明起源的中心,著名的“马家滨文化”、“良渚文化”相继诞生于此.“马家浜文化”主要分布在太湖流域,南达浙江的钱塘江北岸,西北到江苏常州一带.西部为天目山、茅山及山麓丘陵.北、东、南三边受长江口及杭州湾泥沙淤积的影响,形成沿江及沿海高地,整个地形成碟状,据碳14断代并经校正,距今已有7000余年.距今4300年左右又出现了“良渚文化”,它们是我国长江下游、太湖流域新石器时代早期文化的典型代表,是中华民族文化起源的摇篮之一. 展开更多
关键词 宜兴青瓷 良渚文化 中国东南部 太湖流域 碳14断代 新石器时代 文明起源 泥沙淤积
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THE DAWN OF A NEW GOLDEN DECADE
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作者 Michael Zakkour 《北京周报:英文版》 2017年第37期20-21,共2页
关键词 国家领导人 黄金 中国东南部 海上贸易 全球贸易 海滨城市 福建省 俄罗斯
Bioavailability of heavy metals in soil of the Tieguanyin tea garden, southeastern China
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作者 Jingwei Sun Ruilian Yu +3 位作者 Gongren Hu Songhe Jiang Yunfeng Zhang Xiaoming Wang 《中国地球化学学报:英文版》 EI CAS CSCD 2017年第3期519-524,共6页
The bioavailability of 22 heavy metals was investigated at 19 sampling sites in Tieguanyin tea garden in Anxi County,Fujian Province,southeastern China.Heavy metal concentrations were determined by inductively coupled... The bioavailability of 22 heavy metals was investigated at 19 sampling sites in Tieguanyin tea garden in Anxi County,Fujian Province,southeastern China.Heavy metal concentrations were determined by inductively coupled plasma-mass spectrometry(ICP-MS)and evaluated by geo-accumulation index(I_(geo)).Dilute nitric acid extraction was used to evaluate biological activity.Cu,Pb,and Cd were highly bioavailable and most easily absorbed by tea trees.Heavy metal bioavailability in the surface soil was as the ratio of the effective state to the total amount.Cd had the highest I_(geo)values,and the respective samples and sites were classified as moderately/strongly contaminated.Cd element is considered the main factor of heavy metal pollution in the tea garden in Anxi.The other heavy metals studied were present in lower concentrations;thus,the samples were classified as uncontaminated or slightly contaminated. 展开更多
关键词 生物有效性 土壤重金属 中国东南部 铁观音 电感耦合等离子体质谱法 茶园 重金属污染 地质累积指数
A LEGACY OF THE SPICE TRADE
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作者 Xinhua 《北京周报:英文版》 2017年第18期26-29,共4页
关键词 遗产 贸易 香料 中国东南部 生产需要 永春县 泉州市 福建省
Rare earth element chemistry indicates chemical alteration of zircons during the evolution of weathering profile
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作者 Ni Su Shouye Yang Wei Yue 《中国地球化学学报:英文版》 EI CAS CSCD 2017年第3期433-436,共4页
Although rare earth elements(REEs)in magmatic zircons have been widely used to identify the type and compositional evolution of host rocks,REE distribution patterns during the chemical alteration of zircons need clari... Although rare earth elements(REEs)in magmatic zircons have been widely used to identify the type and compositional evolution of host rocks,REE distribution patterns during the chemical alteration of zircons need clarification.We investigated REE characteristics in zircons with different degrees of chemical weathering through systematic observation of a granodiorite-weathering profile in southeast China.Despite the relatively stable provenance of the studied profile(zircon U–Pb ages are95.2±4.8 Ma),the zircon REEs exhibited systematic differences in abundance and fractionation patterns from the bedrock to upper layers,e.g.∑PREE,(LREE/HREE)_(CN),and Ce/Ce*.This evidence suggests chemical alteration of zircons during intensive chemical weathering and an expected influence on REE variability in the weathered products due to the presence of REE-bearing minerals. 展开更多
关键词 稀土元素特征 化学变化 风化剖面 演化过程 锆石 元素化学 中国东南部 花岗闪长岩
Spatial and Temporal Changes in Vapor Pressure Deficit and Their Impacts on Crop Yields in China during 1980–2008
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作者 Shuai ZHANG Fulu TAO Zhao ZHANG 《气象学报:英文版》 SCIE CSCD 2017年第4期800-808,共9页
Vapor pressure deficit(VPD) is a widely used measure of atmospheric water demand. It is closely related to crop evapotranspiration and consequently has major impacts on crop growth and yields. Most previous studies ha... Vapor pressure deficit(VPD) is a widely used measure of atmospheric water demand. It is closely related to crop evapotranspiration and consequently has major impacts on crop growth and yields. Most previous studies have focused on the impacts of temperature, precipitation, and solar radiation on crop yields, but the impact of VPD is poorly understood. Here, we investigated the spatial and temporal changes in VPD and their impacts on yields of major crops in China from 1980 to 2008. The results showed that VPD during the growing period of rice, maize, and soybean increased by more than 0.10kPa(10 yr)~(–1) in northeastern and southeastern China, although it increased the least during the wheat growing period. Increases in VPD had different impacts on yields for different crops and in different regions. Crop yields generally decreased due to increased VPD, except for wheat in southeastern China. Maize yield was sensitive to VPD in more counties than other crops. Soybean was the most sensitive and rice was the least sensitive to VPD among the major crops. In the past three decades, due to the rising trend in VPD, wheat, maize, and soybean yields declined by more than 10.0% in parts of northeastern China and the North China Plain, while rice yields were little affected. For China as a whole, the trend in VPD during 1980–2008 increased rice yields by 1.32%,but reduced wheat, maize, and soybean yields by 6.02%, 3.19%, and 7.07%, respectively. Maize and soybean in the arid and semi-arid regions in northern China were more sensitive to the increase in VPD. These findings highlight that climate change can affect crop growth and yield through increasing VPD, and water-saving technologies and agronomic management need to be strongly encouraged to adapt to ongoing climate change. 展开更多
关键词 中国东南部 作物产量 蒸汽压 时空变化 亏缺 玉米产量 大豆产量 半干旱地区
中国东南部与日本中生代岩浆作用差异性 预览
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作者 赵希林 于胜尧 +5 位作者 李三忠 彭银彪 姜杨 邢光福 余明刚 刘凯 《海洋地质与第四纪地质》 CSCD 北大核心 2017年第4期65-82,共18页
中国东南部和日本同处西太平洋构造-岩浆岩带,中生代均发育了大规模的侵入岩浆作用,但两者对比研究尚相对缺乏。通过对比中国东南部和日本中生代岩浆作用,发现二者既具有相似性,又具有明显的差异性。中国东南部和日本均经历了印支期后... 中国东南部和日本同处西太平洋构造-岩浆岩带,中生代均发育了大规模的侵入岩浆作用,但两者对比研究尚相对缺乏。通过对比中国东南部和日本中生代岩浆作用,发现二者既具有相似性,又具有明显的差异性。中国东南部和日本均经历了印支期后的岩浆作用沉寂期,中国东南部岩浆沉寂期为210~185 Ma,持续了约25Ma;而后中国东南部在170~150 Ma期间岩石圈发生伸展-减薄,导致大量的以黑云母二长花岗岩为主体的"改造型"或"陆壳重熔型"花岗岩类在南岭及其周边地区广泛出现,而在南岭以东的武夷山地区,发育大量的同时代的S型花岗岩及地壳增厚背景下形成的具埃达克质特征的花岗岩类,表明太平洋板块俯冲效应在该区已经显现。然而,日本未见该时期中酸性岩浆活动,日本中生代岩浆活动的沉寂期持续了约50Ma(180~130Ma)。中国东南部晚中生代大规模的岩浆侵入活动主要发生在145~80 Ma之间,并经历了121~117 Ma的动力变形作用;日本在140~100 Ma之间的花岗岩浆活动并不强烈,早期发育大洋俯冲板块熔融相关的埃达克质TTG和高镁安山岩组合,而峰期年龄介于100~60 Ma的花岗质岩石则部分经历了90~87 Ma的动力变形作用。日本晚中生代花岗质岩浆活动、动力变形作用明显比中国东南部大规模的花岗质岩浆活动晚约30~40 Ma。西南日本内带花岗质侵入岩在地质年代上呈现出由西向东逐渐变年轻的趋势,这一现象同中国东南部岩浆活动的迁移性是相同的,而且西南日本内带岩浆岩的同位素组成上也显示出明显的区域性变化。中国东南部中生代岩浆作用结束于80 Ma左右,以A型花岗岩及双峰式的岩浆岩的出现为主要标志;而日本的中生代花岗质岩浆活动则延续到古近纪,以挤压性地壳重熔的富含石榴石/白云母的S型花岗岩的出现为标志;这种差异性可能是由于两地地壳物质组成和性 展开更多
关键词 岩浆作用 太平洋板块 中国东南部 日本 中生代
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The distribution, hydrocarbon potential, and development of the Lower Cretaceous black shales in coastal southeastern China
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作者 Guang Hu Wen-Xuan Hu +6 位作者 Jian Cao Ruo-Fei Yang Hong-Yu Chen Dong-Fang Zhao Qian Pang Hong-Yuan Wang Xiu-Cheng Tan 《古地理学报:英文版》 CSCD 2017年第4期333-351,共19页
Lower Cretaceous black shales in coastal southeastern China are of significance to the geological study of the Tethys and Pacific realms and to hydrocarbon exploration of southeastern China and East China Sea. However... Lower Cretaceous black shales in coastal southeastern China are of significance to the geological study of the Tethys and Pacific realms and to hydrocarbon exploration of southeastern China and East China Sea. However, the stratigraphic correlation, distribution patterns and hydrocarbon potential of the black shales have not been well constrained so far. In this study, the zircon UePb ages, organic petrologic and geochemical analyses were performed for representative outcrop sections in the region. Zircon UePb ages demonstrate that the Lower Cretaceous black shales in coastal southeastern China can be divided into two regional-scale sets. The first set was deposited during the early stage of the Early Cretaceous(K_1~1, BerriasianeHauterivian). The second set was deposited during the late stage of the Early Cretaceous(K_1~2), and might extend to the Taiwan Strait. Detailed organic geochemical analyses including organic matter abundance, type and maturity of the Lower Cretaceous black shales demonstrate that the organic matter abundance of the sources reached medium to good quality by the hydrocarbon source rock standards, and the average TOC values and the chloroform bitumen 'A' of the K_1~1 black shales are higher. The type of organic matter is mainly type III, type II can also be found from the K_1~2 black shales. The thermal maturity of most samples is high to overmature. A relatively comprehensive hydrocarbon resource evaluation indicates that favorable regions are in the northern Guangdong Province for the K_1~1 and in the coastal region of Zhejiang Province and the westernFujian Province for the K_1~2. Sedimentology studies on the Shipu section for the K_1~1 black shales illuminated that the K_1~2 black shales in coastal southeastern China were mainly deposited during transgressive period. The relative sea level changes controlled the sequential development pattern of the K_1~2 black shales. 展开更多
关键词 中国东南部 黑色页岩 下白垩统 东南沿海 生烃潜力 地球化学分析 有机质丰度 开发
Effects of molasses on the fermentation characteristics of mixed silage prepared with rice straw, local vegetable by-products and alfalfa in Southeast China 预览
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作者 WANG Jian CHEN Lei +4 位作者 YUAN Xian-jun GUO Gang LI Jun-feng BAI Yun-feng SHAO Tao 《农业科学学报:英文版》 SCIE CAS CSCD 2017年第3期664-670,共7页
This experiment was conducted to study the effect of molasses on the fermentation characteristics of mixed silage ensiled rice straw and vegetable by-products with alfalfa.Mixture(202 g kg~(–1) dry matter(DM))consist... This experiment was conducted to study the effect of molasses on the fermentation characteristics of mixed silage ensiled rice straw and vegetable by-products with alfalfa.Mixture(202 g kg~(–1) dry matter(DM))consisting of rice straw,broccoli residue and alfalfa at the ratio of 5:4:1 was ensiled with three experimental treatments:(1)no additives(control);(2)molasses at 2.5%(M1);(3)molasses at 5%(M2)on a fresh matter basis of mixture,respectively.All treatments were packed into laboratory-scale silos,and three silos per treatment were sampled on days 1,3,5,14 and 30.The result showed that the p H value of all mixed silages decreased gradually with the time of ensiling except for the control silage,in which a significant increase(P<0.05)on day 30 occurred.The lactic acid content increased gradually with the time of ensiling and reached the highest value on day 14,and a marked decrease(P<0.05)was found in the control silage on day 30.The changes of acetic acid content showed similar pattern with lactic acid content.A trace amount of propionic and butyric acid contents were found in the three mixed silages during the fermentation period.Comparing to the control,M1 and M2 treatments improved the fermentation quality of mixed silages as indicated by higher(P<0.05)lactic acid contents and lower(P<0.05)p H and ammonia-N contents.The Flieg points also showed that M1 and M2 silages were well preserved,whereas the control silage had a bad quality.Overall,the findings of this study suggested that adding molasses could improve fermentation quality of mixed silage,and M1 was more suitable for practical application. 展开更多
关键词 混合青贮 发酵品质 稻草秸秆 苜蓿植物 副产品 中国东南部 糖蜜 乳酸含量
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