新疆西昆仑独尖山地区新生代火山岩地球化学特征及其构造意义  

Geochemical Characteristics and Tectonic Significance of Cenozoic Volcanic Rocks in Dujianshan Area in Xikunlun in Xinjiang Uygur Autonomous Region

作　　者：郑春波 李芝荣 袭著鹏 于森 万全政 邹键 ZHENG Chunbo;LI Zhirong;XI Zhupeng;YU Sen;WAN Quanzheng;ZOU Jian(Pingdu Bureau of Natural Resources,Shandong Qingdao 266700,China;No.3 Exploration Institute of Geology and Mineral Resources,Shandong Yantai 264004,China)

机构地区：[1]平度市自然资源局,山东青岛266700 [2]山东省第三地质矿产勘查院,山东烟台264004

出　　处：《山东国土资源》2022年第12期1-9,共9页Shandong Land and Resources

基　　金：新疆地勘基金中心项目“新疆西昆仑温泉-独尖山一带1∶5万区域地质矿产调查”项目(K15-1-LQ20)”和“新疆若羌县大沙沟一带1∶5万区域地质矿产调查项目(XB-DK-2015-1-05)的成果

摘　　要：新疆西昆仑独尖山地区发育第四纪乌鲁克库勒组火山岩,根据岩石分布范围,将研究区内乌鲁克库勒组火山岩分为阿塔木帕下火山岩区和阿什库勒火山岩区,二者岩石组合相似,以爆发相凝灰质(角)砾岩、火山渣及溢流相玄武岩、玄武安山岩为主。岩石SiO 2含量为60.42%~61.99%,Na 2O+K 2O为6.31%~7.10%,里特曼指数为2.22~2.67,固结指数8.27~14.36,铝质指数为0.63~0.73,岩石总体表现为偏铝质钾质钙碱性岩石系列特征。样品富集大离子亲石元素,亏损高场强元素,稀土元素配分曲线呈右陡倾型,显示出岛弧火山岩的特点。结合区域地质特征,乌鲁克库勒组火山岩形成时代为中新世,其岩浆主要来源于地幔,且岩石在形成过程中明显受到地壳物质混染,形成环境为大陆岛弧环境。Quaternary Wulukekule formation volcanic rocks are developed in Dujianshan area in Xikunlun in Xinjiang Uygur Autonomous Region.According to the distribution range of rocks,volcanic rocks of Wulukekule formation in the study area are divided into the lower Atamupa volcanic rock area and Ashkule volcanic rock area.The rock combination of the two areas is similar,mainly including explosive facies tuffaceous(breccia)conglomerate,volcanic scoria,overflow facies basalt and basalt andesite.The content of SiO 2 in the rock is 60.42%~61.99%,Na 2O+K 2O is 6.31%~7.10%,the Ritman index is 2.22~2.67,the consolidation index is 8.27~14.36,and the aluminous index is 0.63~0.73.The rock is generally characterized by a series of aluminous potassium calc alkaline rocks.The samples are enriched in large ion lithophile elements,but depleted in high field strength elements.The REE distribution curve is right steep,and shows the characteristics of island arc volcanic rocks.Combining with regional geological characteristics,the formation age of the volcanic rocks of Wulukekule formation is Miocene.Its magma mainly comes from the mantle,and the rocks are obviously contaminated by crustal materials in the formation process.The formation environment is a continental island arc environment.

关 键 词：乌鲁克库勒组 阿什库勒火山群 地球化学 构造环境 独尖山 新疆西昆仑 

分 类 号：P59[天文地球—地球化学]