青海南部治多-杂多地区石炭纪-三叠纪砂岩地球化学特征与构造背景探讨

永颉同心 · 发表于 2011-10-13 11:15

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青海南部治多-杂多地区石炭纪-三叠纪砂岩地球化学特征与构造背景探讨

赵小明　王建雄　牛志军　汤朝阳　姚华舟　

摘　要：选取青海南部治多-杂多地区石炭纪-三叠纪的砂岩、粉砂岩样品,进行主量元素地球化学分析,利用分析结果判别物源区大地构造背景,探讨北羌塘盆地的性质及演化.研究结果表明:北羌塘中段的治多-杂多地区物源区大地构造背景早石炭世为被动大陆边缘;早中二叠世为被动大陆边缘、活动大陆边缘和大陆岛弧;晚三叠世为被动大陆边缘、活动大陆边缘和大陆岛弧.结合地层学、沉积学和岩石学,治多-杂多地区的沉积盆地经历了早石炭世被动陆缘克拉通盆地-早中二叠世裂陷盆地和早中三叠世被动边缘克拉通盆地-晚三叠世弧后前陆盆地的两个演化旋回,体现了金沙江缝合带和甘孜-理塘缝合带成生发展在研究区内的沉积响应.
关键词：盆地;构造背景;主量元素;北羌塘;青海
分类号：P595542　文献标识码：A
文章编号：1000-0550(2008)01-0011-10

Discussion on the Tectonic Setting and Geochemical Characteristics of Sandstones from Carboniferous to Triassic in Zhidoi-Zadoi Area, Southern Qinghai

ZHAO Xiao-ming　 WANG Jian-xiong　 NIU Zhi-jun　 TANG Zhao-yang　 YAO Hua-zhou　

基金项目：中国地质调查局基础地质调查《1:25万直根尕卡幅(200213000003)》、《1:25万曲麻莱县幅(200313000006)》和国家自然科学基金项目(批准号:40372004)资助.
作者简介：赵小明男 1970年出生在读博士高级工程师区域地质与地层古生物学
作者单位：赵小明（宜昌地质矿产研究所,湖北宜昌,443003）　
　　　　　王建雄（宜昌地质矿产研究所,湖北宜昌,443003）　
　　　　　牛志军（宜昌地质矿产研究所,湖北宜昌,443003）　
　　　　　汤朝阳（宜昌地质矿产研究所,湖北宜昌,443003）　
　　　　　姚华舟（宜昌地质矿产研究所,湖北宜昌,443003）　

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