西天山乌孙山地区大哈拉军山组火山岩岩石组合与喷发序列研究进展  

Volcanic Rocks Assemblage and Eruption Sequence of Dahalajunshan Formation in Wusunshan Region,Western Tianshan

作　　者：茹艳娇 李智佩[3] 白建科[3] 李婷[3] 夏昭德[2] RU Yanjiao;LI Zhipei;BAI Jianke;LI Ting;XIA Zhaode(Geophysical and Geochemical Exploration Corporation,Bureau of Geological Exploration for Nonferrous Metals in Northwest China,Xi＇an 710068,Shaanxi,China;School of Earth Science and Resources,Chang＇an University,Xi＇an 710054,Shaanxi,China;Xi＇an Center of China Geological Survey,Xi＇an 710054,Shaanxi,China)

机构地区：[1]西安西北有色物化探总队有限公司,陕西西安710068 [2]长安大学地球科学与资源学院,陕西西安710054 [3]中国地质调查局西安地质调查中心,陕西西安710054

出　　处：《西北地质》2018年第4期33-42,共10页Northwestern Geology

基　　金：长安大学中央高校基本科研业务费专项“岩浆成矿与遥感技术应用”(310827173401)

摘　　要：新疆西天山地区伊犁地块南北缘以及地块内部广泛分布着大哈拉军山组火山岩系。笔者在前人研究基础上,以乌孙山一带出露的大哈拉军山组火山岩为主要研究对象,通过路线地质调查、剖面测制和岩相学等方面的系统研究,厘定了大哈拉军山组的岩石组合、地层序列及其变化规律。大哈拉军山组火山岩总体由玄武岩、安山岩、英安岩、流纹岩,以及中酸性火山碎屑岩组成。乌孙山—塔斯巴山地区以安山岩为主,占50%,玄武岩、英安岩和流纹岩比例相近。火山岩地层喷发序列上,乌孙山—塔斯巴山一带底部为中酸性火山岩,向上为中基性与中酸性火山岩的交替喷发,可划分出5～7个喷发旋回,火山活动整体上具有裂隙式-中心式喷发的特征。The volcanic rocks of Dahalajunshan Formation are widespread in the Western Tians han Mountain, which are mainly exposed at north and south edges and inside of Yili Block. On the basis of previous work, the volcanic rocks of Dahalajunshan Formation exposed in Wusunshan region have been taken as studying objects in this paper. By systematically field geology, profile and petrography, the rock association, stratigraphic sequence and its variation have been deter mined. The volcanic rocks of Dahalajunshan Formation are overall composed of basalt, andesite, dacite, rhyolite and intermediate acid pyroclastic rock. At the south part of Yili block, the vol canic rocks in Wusunshan Tasibashan area are mainly andesite （up to 50%）, with a similar pro portion of basalt, dacite and rhyolite. In the aspects of lava＇s eruption sequence, the acid magma was firstly erupted in Wusunshan Tasibashan area, and then basic and acid magma were erupted in turn, which can be divided into 5~7 eruption cycles, with a character o{ fissure central eruption.

关 键 词：大哈拉军山组 岩石组合 喷发序列 乌孙山 西天山 

分 类 号：P317[天文地球—固体地球物理学]