| 扬子克拉通北缘新元古代大陆岩石圈脱层作用信息——毕机沟镁铁质-超镁铁质侵入体同位素地球化学指示 |
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| 引用本文： | 凌文黎,张本仁,周炼,赵祖斌.扬子克拉通北缘新元古代大陆岩石圈脱层作用信息——毕机沟镁铁质-超镁铁质侵入体同位素地球化学指示[J].矿物岩石,1997(1). |
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| 作者姓名： | 凌文黎 张本仁 周炼 赵祖斌 |
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| 作者单位： | “壳幔体系组成、物质交换及动力学”开放研究实验室，中国地质大学 |
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| 基金项目： | 国家自然科学基金,地质矿产部“壳幔体系组成、物质交换及动力学”开放研究实验室研究基金 |
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| 摘 要： | 毕机沟侵入体作为扬子克拉通北缘已知分布面积最大的镁铁质－超镁铁质侵入岩体，在扬子克拉通岩石圈演化研究中具有重要地位。除在七十年代开展过部分矿产资源调查工作外，长期缺乏深入研究。本文在Ｓｍ－Ｎｄ和Ｒｂ－Ｓｒ年代学工作基础上厘定了毕机沟侵入体的侵位和后期构造热事件时代；根据侵入体源区地幔组成特征和地幔端元组成，显示出毕机沟岩体源区具有与大陆岩石圈脱层作用有关的成因信息，结合晚元古代扬子克拉通北缘在构造体制、幔源岩浆性质和地壳增生方式等发生突变的地质背景以及现代大陆岩石圈脱层作用研究成果，提出了区内新元古代可能存在大陆岩石圈脱层作用的初步认识
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| 关 键 词： | 毕机沟岩体 新元古代 扬子克拉通北缘 大陆岩石圈 脱层作用 |
CONTINENTAL DELAMILATION SIGNALS BENEATH THE NORTHERN MARGIN OF THE YANGTZE CRATON DURING NEOPROTEROZOIC:INDICATION OF ISOTOPIC GEOCHEMISTRY FROM BIJIGOU MAFIC ULTRAMAFIC INTRUSIVE ROCK |
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| Ling Wenli,Zhang Benren,Zhou Lian,Zhao Zubin.CONTINENTAL DELAMILATION SIGNALS BENEATH THE NORTHERN MARGIN OF THE YANGTZE CRATON DURING NEOPROTEROZOIC:INDICATION OF ISOTOPIC GEOCHEMISTRY FROM BIJIGOU MAFIC ULTRAMAFIC INTRUSIVE ROCK[J].Journal of Mineralogy and Petrology,1997(1). |
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| Authors: | Ling Wenli Zhang Benren Zhou Lian Zhao Zubin |
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| Abstract: | As the largest mafic ultramafic intrusive body in the Qinling orogenic belt is very important for the studying of the evolution of the continental lithosphere beneath the northern margin of Yangtze Craton.According to Sm Nd and Rb Sr isotopic analyses,the intrusive rock was formated at about 940 Ma and subjected a tectonothermal reworking at some 700 Ma.A continental lithospheric delamination related signatures are indicated from the isotopic array and mantle components of the magma reservoirs of the intrusion.Based on the model and knowledge about contemporary continental lithospheric delamilation with the regional geological background,a sudden change in crust growth pattern,tectonic mechanism and mantle reservoir nature etc.along the northern margin of the Yangtze Craton during the Neoproterozoic,it is proposed that continental lithopheric delamination may have taken placed during the Neoproterozoic in the area. |
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| Keywords: | Bijigou intrusion Neoproterozoic northern margin of the Yangtze Craton continental lithosphere delamination |
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