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| 湖南道县虎子岩碱性玄武岩及其基性捕虏体成因和地质意义 | |
| 引用本文： | 杨金豹,赵志丹,莫宣学,盛丹,丁聪,王丽丽,侯青叶,李红进.湖南道县虎子岩碱性玄武岩及其基性捕虏体成因和地质意义[J].岩石学报,2015,31(5):1421-1432. |
| 作者姓名： | 杨金豹 赵志丹 莫宣学 盛丹 丁聪 王丽丽 侯青叶 李红进 |
| 作者单位： | 1. 中国地质大学地质过程与矿产资源国家重点实验室,地球科学与资源学院,北京100083 2. 湖南省国土资源规划院,长沙,410007 3. 延长石油集团研究院,西安,710077 |
| 基金项目： | 本文受深部探测技术与实验研究专项课题(Sinoprobe-04-02)、科技部国际合作基金(2011DFA22460)和111计划(B07011)联合资助. |
| 摘 要： | 本文在湖南道县虎子岩地区采集了碱性玄武岩、橄榄辉长岩和基性麻粒岩捕虏体。碱性玄武岩的斑晶为橄榄石(10%~15%),岩石K2O含量为2.88%~3.51%,Mg#值为80,具有洋岛玄武岩的微量元素特征,岩石具有富集的氧同位素组成(7.8‰~11.0‰),可能是其上升到地表后由碳酸盐岩组分的加入及后期风化蚀变作用造成的,其相对均一且为负的εNd(t)值和靠近EMⅡ地幔端员的特点,指示了该玄武岩是拉张构造环境下富集地幔部分熔融的产物。橄榄辉长岩具有弱富集的LREE(La/Yb)N=2.5~3.0)、弱的Eu正异常(δEu=1.03~1.06),其Sr-Nd同位素组成更靠近EMⅡ地幔端员,87Sr/86Sr比值、εNd(t)值及Nd模式年龄均高于碱性玄武岩,说明橄榄辉长岩是先形成的上述玄武岩浆在未到达地表之前局部发生结晶作用后形成的。基性麻粒岩捕虏体具较强的正Eu异常(δEu=1.42~4.41),其重稀土元素含量出现明显的分组特征,强烈亏损U、Th和Nb、Ta、Zr、Hf、Ti等高场强元素,同时Sr-Nd同位素组成显示其具有壳幔混合的特征。本文结合已有研究结果,探讨了岩浆起源和演化,以及与古太平洋板片俯冲有关的构造环境转换。 |
| 关 键 词： | 碱性玄武岩 基性麻粒岩捕虏体 富集地幔 构造环境 华南 |
| 收稿时间： | 2014/4/29 0:00:00 |
| 修稿时间： | 2015/1/20 0:00:00 |
Petrogenesis and implications for alkali olivine basalts and its basic xenoliths from Huziyan in Dao County, Hunan Province. |
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| YANG JinBao,ZHAO ZhiDan,MO XuanXue,SHENG Dan,DING Cong,WANG LiLi,HOU QingYe and LI HongJin.Petrogenesis and implications for alkali olivine basalts and its basic xenoliths from Huziyan in Dao County, Hunan Province.[J].Acta Petrologica Sinica,2015,31(5):1421-1432. | |
| Authors: | YANG JinBao ZHAO ZhiDan MO XuanXue SHENG Dan DING Cong WANG LiLi HOU QingYe and LI HongJin |
| Institution: | State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083, China;Hunan Land and Resources Planning Institute, Changsha 410007, China;State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083, China;State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Science and Mineral Resources, China University of Geosciences, Beijing 100083, China;Research Institute of Yanchang Petroleum (Group) Co., Ltd., Xi'an 710077, China |
| Abstract: | |
| Keywords: | Alkali basalts Basic granulite xenoliths Enriched mantle Tectonic setting South China |
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