新疆哈拉阿拉特山太勒古拉组黑色页岩构造背景及物源分析  

Tectonic setting and provenance analysis for Tailegula Formation black shales in Hala-alat Mountain of Xinjiang

作　　者：舒想清 高宝龙 杨育振 邹璇 袁雄 闵丹 SHU Xiangqing;GAO Baoong;YANG Yuzhen;ZOU Xuan;YUAN Xiong;MIN Dan(Central South Geo-Exploration Institute,China Metallurgical Geology Bureau,Hubei Wuhan 430081,China;Institute of Mineral Resources Research,China Metallurgical Geology Bureau,Beijing 101300,China)

机构地区：[1]中国冶金地质总局中南地质调查院,湖北武汉430081 [2]中国冶金地质总局矿产资源研究院,北京101300

出　　处：《中国地质调查》2024年第6期44-53,共10页Geological Survey of China

基　　金：中国地质调查局“新疆区域地质调查片区总结与服务产品开发(编号:DD20160345-04)”项目资助。

摘　　要：新疆哈拉阿拉特山地区(简称哈山地区)在晚石炭世为沟弧盆体系下岛弧较发育的构造格局,上石炭统太勒古拉组黑色页岩被认为是岛弧作用相对减弱时期海沟和弧前盆地深水沉积的产物,但尚缺乏地球化学依据。对哈山地区太勒古拉组黑色页岩开展探槽施工并进行采样分析,结果表明:黑色页岩具有富MgO和Na(2)O,贫TiO_(2)、Al_(2)O_(3)、Fe_(2)O_(3)及CaO,SiO_(2)含量适中,大离子亲石元素相对贫乏,轻稀土相对富集,重稀土相对亏损,负Eu异常的特征,与上地壳稀土元素配分模式相近;哈山地区太勒古拉组黑色页岩的构造背景主要为大陆岛弧,母岩属于中酸性-长英质物源,主要来自上地壳,物源区可能为北部的塔尔巴哈台—纳尔曼得早古生代沟弧带和谢米斯台—东泉晚古生代岛弧带。研究可为哈山地区巨厚页岩的物质来源提供参考。The tectonic framework in Hala-alate Mountain area of Xinjiang at the Late Carboniferous is island arc developed under trench-arc-basin system,and the Upper Carboniferous Tailegula Formation black shale is con-sidered to be a product of deep-water deposition in the trench and forearc basin during the period of island arc effect being relatively weakened,but with a lack of geochemical evidence.Trench exploration and sampling analy-sis were conducted on the black shales of Tailegula Formation in the study area.The results show that the black shale of Tailegula Formation in the study area is rich in MgO and Na(2)O,poor in TiO_(2),Al_(2)O_(3),Fe_(2)O_(3) and CaO_(2),and moderate in SiO_(2).The large ion lithophile element is relatively poor,and light rare earth element is relatively rich.The heavy rare earth element is relatively loss,and theδEu has negative anomaly,indicating similar distri-bution pattern with rare earth element in the upper crust.The tectonic setting of Tailegula Formation black shale in Hala-alate Mountain is mainly the continental island arc.The source rock belongs to intermediate to acid and felsic provenance,and it mainly originates from upper continental crust.The source region is probably Early Paleo-zoic trench-arc of Tarbagatay-Narmande and Late Paleozoic island arc of Xiemisitai-Dongquan in the north.This study could provide some references for the provenance analysis of the giant thick shales in Hala-alate Mountain area.

关 键 词：太勒古拉组 黑色页岩 构造背景 物源 

分 类 号：P595[天文地球—地球化学]