梁文博;郭瑞清;刘桂萍;邹明煜;胡雪原;吴华楠;张梦迪;崔涛;

• 1:新疆大学地质与矿业工程学院
• 2:中国矿业大学资源与地球科学学院

摘要(Abstract)：

对新疆库鲁克塔格西段橄榄辉长岩脉进行了系统的岩石学、年代学和全岩地球化学研究,确定了岩脉成因,并探讨了其构造意义。LA-ICP-MS锆石U-Pb测年结果表明,橄榄辉长岩脉结晶年龄为(433.4±1.6)Ma(MSWD=2.2),属志留纪中期岩浆活动的产物。全岩地球化学表明,岩脉具有高Al2O3和CaO、贫碱、低P2O5和TiO2的特征,属于钙碱性系列;另外,岩脉具有较高的Mg#值(77.47～79.01)、明显的Eu正异常(δEu=1.12～1.23),其轻稀土元素轻微富集,重稀土元素相对平缓;微量元素蛛网图上岩脉富集大离子亲石元素Rb、Ba、K、Sr,亏损高场强元素Nb、Ta、P、Ti。综合分析表明,岩脉岩浆源自被俯冲板片流体改造过的地幔楔部分熔融,部分熔融比例在2%～10%之间,由其形成的母岩浆在演化过程中遭受了低程度的陆壳混染,并经历了橄榄石和斜长石的堆晶作用。结合区域已有资料,认为塔里木北缘库鲁克塔格地区在古生代中期经历了南天山洋向南俯冲,橄榄辉长岩脉产于主动大陆边缘环境,该时期存在显著的大陆地壳垂向生长。

关键词(KeyWords)： 橄榄辉长岩脉;志留纪;主动大陆边缘;垂向生长;库鲁克塔格;塔里木北缘

Abstract:

Keywords:

基金项目(Foundation): 中国地质科学院地质研究所联合基金项目(U1403291)

作者(Author): 梁文博;郭瑞清;刘桂萍;邹明煜;胡雪原;吴华楠;张梦迪;崔涛;

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