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| 桂北龙胜丹洲群火山岩的地幔源区及大地构造环境 | |
| 引用本文： | 葛文春,李献华,李正祥,周汉文.桂北龙胜丹洲群火山岩的地幔源区及大地构造环境[J].吉林大学学报(地球科学版),2001,31(1):20-24. |
| 作者姓名： | 葛文春 李献华 李正祥 周汉文 |
| 作者单位： | 1. 中国科 学院 广州地球化学研究所，广东 广州 510640 2. 西澳大学 地质和地球物理系，澳大利 亚 WA6009 3. 中国地质大学 地球科学学院，湖北 武汉 430074 |
| 基金项目： | 国家杰出青年科学研究基金(49725309)和中国科学院资源与 生态环境重大项目B(KZ951-B1-413)资助 |
| 摘 要： | 桂北龙胜地区丹洲群形成于新元古代 ( 82 0～ 76 0Ma) ,其合桐组火山岩由细碧岩和流纹岩组成 ,构成双峰式岩石组合。细碧岩的母岩浆起源于经消减板片流体交代而成的富集陆下岩石圈地幔 ,流纹岩与细碧岩是同源岩浆结晶分异的产物。双峰式火山岩形成于大陆岩石圈减薄的拉张环境 ,与导致新元古代Rodinia超大陆裂解作用的地幔柱活动相联系 |
| 关 键 词： | 双峰式火山岩 岩石圈地幔 大陆裂解 新元古代 广西龙胜 |
| 文章编号： | 1008-0058(2001)01-0020-05 |
| 修稿时间： | 2000年6月19日 |
MANTLE SOURCE AND TECTONIC SETTINGS FOR THE VOLCANIC ROCKS FROM DANZHOU GROUP IN LONGSHENG AREA, NORTHERN GUANGXI |
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| GE Wen_chun ,LI Xian_hua ,LI Zheng_xiang ,ZHOU Han_wen.MANTLE SOURCE AND TECTONIC SETTINGS FOR THE VOLCANIC ROCKS FROM DANZHOU GROUP IN LONGSHENG AREA, NORTHERN GUANGXI[J].Journal of Jilin Unviersity:Earth Science Edition,2001,31(1):20-24. | |
| Authors: | GE Wen_chun LI Xian_hua LI Zheng_xiang ZHOU Han_wen |
| Institution: | GE Wen_chun 1,LI Xian_hua 1,LI Zheng_xiang 2,ZHOU Han_wen 3 |
| Abstract: | Danzhou group in Longsheng area formed at late Proterozoic e ra(820～760 Ma), and its Hetong formation is composed of spilite and rhyolite w hich constit ute the bimodal rock association. The source magma of spilite deserved from enri ched lower lithospheric mantle which had ever been metasomatized by fluid from s ubducted slab. Rhyolite and spilite are the products of cogenetic magma through the process of crystallization and differentiation. Bimodal volcanic rocks forme d at an extensional setting of continental lithospheric thinning, and related to the activities of mantle plume, which led to the breakup of late Proterozoic Ro dinia supercontinent. |
| Keywords: | bimodal volcanic rocks lithospheric mantle continental breakup Neoproterozoic Longsheng area in Guangxi |
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