| 扬子陆块西缘晚古生代玄武岩浆的性质和演化——玄武岩-辉绿玢岩稀土元素-微量元素地球化学研究 |
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| 引用本文： | 韩吟文,陈北岳,柳建华,许继锋.扬子陆块西缘晚古生代玄武岩浆的性质和演化——玄武岩-辉绿玢岩稀土元素-微量元素地球化学研究[J].地球科学,1999,8(3):234-239. |
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| 作者姓名： | 韩吟文 陈北岳 柳建华 许继锋 |
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| 作者单位： | 中国地质大学地球化学研究所,武汉,430074,中国科学院广州地球化学研究所,广州,510640 |
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| 基金项目： | 国家自然科学基金;49290102; |
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| 摘 要： | 以四川和云南晚二叠世-早三叠世形成的峨嵋山玄武岩和同期形成的龙门山、墨江辉绿玢岩为主要研究对象,结合与勉略、三江蛇绿岩套内的玄武岩的对比,从岩石的化学成分、稀土元素和微量元素的含量和特征比值分析,提出晚古生代扬子陆块西缘的基性岩浆活动经历了由特提斯洋壳俯冲诱发陆块内玄武岩浆的发生、洋壳消减和陆块内大规模玄武岩浆喷发及局部小规模岩浆活动的萎缩消亡3个发展演化阶段.扬子陆块内玄武岩浆主要来源于正常或富集型地幔,在发生和萎缩阶段部分岩浆源自亏损型地幔.扬子陆块西缘晚古生代时期的基性岩浆活动是全球岩石圈构造活动的局域表现,与特提斯洋的俯冲-封闭有直接联系.
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| 关 键 词： | 扬子陆块西缘 晚古生代 玄武岩浆 稀土元素 微量元素 特提斯洋 |
| 修稿时间： | 1999-01-10 |
NATURE AND EVOLUTION OF LATE PALEOZOIC BASALTIC MAGMAS ALONG WESTERN MARGIN OF YANGTZE CRATON: GEOCHEMICAL STUDY OF REE AND TRACE ELEMENTS |
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| Han Yinwen,Chen Beiyue,Liu Jianhua,Xu Jifeng.NATURE AND EVOLUTION OF LATE PALEOZOIC BASALTIC MAGMAS ALONG WESTERN MARGIN OF YANGTZE CRATON: GEOCHEMICAL STUDY OF REE AND TRACE ELEMENTS[J].Earth Science-Journal of China University of Geosciences,1999,8(3):234-239. |
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| Authors: | Han Yinwen Chen Beiyue Liu Jianhua Xu Jifeng |
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| Abstract: | Emeishan basalt, Longmenshan
diabase-prophyrite, and Mojiang diabase-prophyrite in the Late Permian-Early Triassic are
important objects of the present paper. A correlation between the basalt in the Mianl e ophiolite
suite and that in the Sanjiang ophiolite suite can be used to suggest, on the bases of the
chemical compositions of the rocks, the contents of the REE and trace elements, and the
ratio of special elements in these rocks, that the Late Paleozoic basic magmatic activity
in the western margin of Yangtze craton can be divided into three evolutionary stages (1)
basaltic magma in Yangtze continent was induced by the subduction of Tethyan oceanic
crust; (2) the basaltic magma erupted on a large scale within the Yangtze craton with the
subduction of Tethyan oceanic crust, and (3) the magmatic activity turned weaker and
weaker until it was extinct within a limited region. The basaltic magma within the Yangtze
craton mainly originated from the normal or concentrated mantle. During the initial and
final evolutionary stages, part of magma originated from the depleted mantle. The Late
Paleozoic basic magma activity in the western margin of the Yangtze craton must have been
part of the tectonic changes of the global lithosphere and, therefore, must have been
directly correlated with the subduction of Tethyan oceanic plate. |
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| Keywords: | western margin of Yangtze craton Late Paleozoic basaltic magma rare earth element trace element Tethys |
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