伊宁地块阿腾套山一带大哈拉军山组流纹岩地球化学特征及其地质意义  

Geochemical characteristics and geological significance of rhyolites of the Dahalajunshan formation in the altentiushan area of Yining block

作　　者：王伟宁 滕明耀 罗耀清 罗鑫 李宇航 WANG Wei-ning;TENG Ming-yao;LUO Yao-qing;LUO Xin;LI Yu-hang(School of Geosciences and resources,Chang'an University,Xi’an 710054,China)

机构地区：[1]长安大学地球科学与资源学院

出　　处：《世界有色金属》2019年第23期169-171,共3页World Nonferrous Metals

摘　　要：本文对伊宁地块阿腾套山一带大哈拉军山组的流纹岩进行了时代和地球化学研究。地球化学分析结果表明,岩石具富硅、富铝、富碱、贫钙、低钛特征,稀土元素总量较低,稀土分布模式为轻稀土富集右倾型,铕负异常明显,相对富集大离子亲石元素K、R b、Th、U,相对亏损高场强元素Nb、Ta,显著亏损Sr、P和Ti,岩石成因为地壳部分熔融。综合最新研究资料和区域构造演化,认为,在早石炭世早期,阿腾套山一带大哈拉军山组流纹岩形成与弧后拉张早期,地球化学表现以陆源弧特征为主。In this paper,the age and geochemistry of rhyolites from the Dahalajunshan formation in the area of atentoushan,Yining block are studied.The results of geochemical analysis show that the rocks are characterized by rich silicon,rich aluminum,rich alkali,poor calcium and low titanium.The total amount of rare earth elements is relatively low.The distribution pattern of rare earth elements is light rare earth enrichment right incline type.The negative anomaly of europium is obvious.The relative enrichment of large ion lithophile elements K,Rb,th,u,relative loss of high field strength Elements Nb,Ta,and significant loss of Sr,P and Ti.The lithogenesis is due to partial melting of the crust.Based on the latest research data and regional tectonic evolution,it is believed that in the early Early Carboniferous,the formation of rhyolite and the early stage of back arc extension of the Dahalajunshan formation in the area of atentoushan are characterized by terrigenous arc.

关 键 词：伊宁地块 大哈拉军山组 流纹岩 地球化学 

分 类 号：P588.1[天文地球—岩石学]