期刊文献+

汉诺坝幔源橄榄岩包体的微量元素和Re-Os同位素地球化学:SCLM的性质和形成时代 预览 被引量:12

The trace element and Re-Os isotopic geochemistry of mantle-derived peridotite xenoliths from Hannuoba:Nature and age of SCLM beneath the area
在线阅读 下载PDF
收藏 分享 导出
摘要 本文报道了汉诺坝新生代碱性玄武岩中地幔橄榄岩包体的主量、微量元素和Re-Os同位素.14个尖晶石橄榄岩Re、Os含量分别为0.022~0.193ng/g和1.237~4.304 ng/g,187Os/188Os比值为0.1183~0.1244,与187Re/188Os比值相关性不好,但与熔体亏损指标如重稀土元素Yb的含量、全岩Al2O3的百分含量有很好的线性关系,可能反映了地幔熔融后的Re或/和Os的活动.全岩Al2O3、CaO、TiO2含量均与MgO有很好的负相关性,全岩原始地幔标准化REE丰度模式呈现了LREE亏损,表明该区橄榄岩包体是由软流圈地幔经过部分熔融,亏损了玄武质组分后形成的.由Os同位素代理等时线得到该区陆下岩石圈地幔的形成年龄为1.7~2.0Ga,表明尖晶石相橄榄岩所代表的岩石圈地幔是中元古代的陆下岩石圈地幔减薄后的残留体. The major elements, trace elements and Re-Os isotopic data of mantle peridotite xenoliths entrained in Hannuoba Cenozoic alkali basalts were obtained in this study. The contents of Re and Os of 14 samples of spinel peridotites are 0.022 similar to 0.193 ng/g and 1.237 similar to 4.304 ng/g, respectively, and the Os-187/(188) Os ratio is 0.1183 similar to 0.1244. The osmium isotope compositions do not correlate well with Re-187/Os-188, but correlate well with indices of basaltic melt extraction, such as the content of Yb and the weight percent of Al2O3, which may reflect mobility of Re and/or Os after mantle partial melting. The negative correlations between Al2O3, CaO, TiO2 and MgO contents and the depleted primitive mantle-normalized REE patterns of whole rock indicate the removal of basaltic melts from asthenosphere mantle during partial melting. The osmium proxy isochron age of the peridotite xenoliths is 1.7 similar to 2.0Ga, therefore the present upper mantle, consisting of spinel lherzolites, in this area is probably the residue of the Middle Proterozoic SCLM after lithosphere delamination.
作者 夏琼霞 支霞臣 孟庆 郑磊 彭子成 Xia, QX;Zhi, XC;Meng, Q;Zheng, L;Peng, ZC;
出处 《岩石学报》 SCIE CAS CSCD 北大核心 2004年第5期 1215-1224,共10页 Acta Petrologica Sinica
基金 国家自然科学基金,高等学校博士学科点专项科研项目
关键词 RE-OS同位素 微量元素 橄榄岩包体 汉诺坝 Re-Os isotopes trace elements peridotite xenoliths Hannuoba
  • 相关文献

参考文献42

  • 1[1]Allegre C J, Luck J M. 1980. Osmium isotopes as petrogenetic and geological trace. Earth. Planet. Sci. Lett., 48:148-154 被引量:1
  • 2[2]Bennett V C, Nutman A P, Esat T M. 2002. Constraints on mantle evolution from 187Os/188 Os isotopic compositions of Archean ultramafic rocks from southern West Greenland (3. 8Ga) and Western Australia (3. 46Ga). Geochim. Cosmochim. Acta, 66(14) :2615 -2630 被引量:1
  • 3[3]Birck J L, Roy Barman M, Capmas F. 1997. Re-Os isotope measurements at the femtomole level in natural samples.Geostandards Newsletter, 21:19-27 被引量:1
  • 4[4]Creaser R A, Papanastassiou D, Wasserburg G J. 1991. Negative thermal ion mass spectrometry of osmium, rhenium, and iridium. Geochim.Cosmochim. Acta, 55:397 -401 被引量:1
  • 5[5]Feng Jialin, Xie Manze, Zhang Hong, Li Wenxuan. 1982. Hannuoba basalts and its deep source xenoliths. Bulletin of Hebei Geological College, 1-2: 45-63 (in Chinese) 被引量:1
  • 6[6]Gao S, Rudnick R L, Carlson R W, McDonough W F, Liu Y S. 2002.Re-Os evidence for replacement of ancient mantle lithosphere beneath the North China craton. Earth and Planetary Science Letters, 198 (3-4): 307-322 被引量:1
  • 7[7]Handler M R, Bennett V C, Esat T M. 1997. The persistence of offcratonic lithospheric mantle: Os isotope systematics of variably metasomatised southeast Australian xenoliths. Earth Planet. Sci.Lett. , 151:61 -75 被引量:1
  • 8[8]Handler M R, Wysoczanski R J, Gamble J A. 2003. Proterozoic lithosphere in Marie Byrd Land, West Antarctica: Re-Os systematics of spinel peridotite xenoliths. Chemical Geology, 196: 131-145 被引量:1
  • 9[9]Jin Yongbin, Zhi Xiachen, Meng Qing, Gao Tianshan, Peng Zicheng.2003. Re-Os dating of the Raobazhai ultramafic massif in North Dabie. Chinese Science Bulletin. 49(5): 508 -513 被引量:1
  • 10[10]Li Guohui. 1999. Determination of major and minor elements in chromite by X-ray fluorescence spectrometry. Rock and Mineral Analysis, 18(2): 131-134(in Chinese) 被引量:1

同被引文献776

引证文献12

二级引证文献79

投稿分析
职称考试

相关作者

内容加载中请稍等...

相关机构

内容加载中请稍等...

相关主题

内容加载中请稍等...

浏览历史

内容加载中请稍等...
;
使用帮助 返回顶部 意见反馈