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Geochemical Characteristics and Origin of Permian Basalts in Binchuan-Lijiang Area, Yunnan Province
Author(s): 
Pages: 130-138
Year: Issue:  2
Journal: JOURNAL OF EARCH SCIENCES AND ENVIRONMENT

Keyword:  宾川-丽江地区大陆溢流玄武岩岩石化学地幔柱构造背景;
Abstract: 通过对云南省宾川-丽江地区岩石学和地球化学研究,系统阐述了玄武岩岩石地球化学及其岩浆活动特征.认为研究区玄武岩可划分为高镁、低镁和过渡3个系列火山岩,其岩石地球化学性质呈现递变性,富集轻稀土和大离子亲石元素,具有与洋岛玄武岩相似的地球化学特征,为板内拉张玄武岩.同时运用现代岩石成因理论探讨了玄武岩的地幔源区特征、岩浆过程及可能的形成机制.运用多个玄武岩大地构造环境判别图解,确定玄武岩形成于大陆拉张环境,与地幔柱活动有关.起源于地幔柱的岩浆与岩石圈相互作用,经历不同程度的壳源混染,形成系列玄武岩.
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