东昆仑南缘早三叠世洪水川组的源区特征：来自碎屑组成、重矿物和岩石地球化学的证据  

Provenance of Early Triassic Hongshuichuan Formation in the southern margin of the East Kunlun Mountains:Constrains from detrital framework,heavy mineral analysis and geochemistry.

作　　者：闫臻[1] 边千韬[2] Oleg A. Korchagin Igor I. Pospelov 李继亮[2] 王宗起[1] 

机构地区：[1]中国地质科学院地质研究所,北京100037 [2]中国科学院地质与地球物理研究所,北京100029 [3]俄罗斯科学院地质研究所,莫斯科119017

出　　处：《岩石学报》2008年第5期1068-1078,共11页Acta Petrologica Sinica

基　　金：国家科技支撑计划项目(2006BAB01A11);国家自然科学基金委项目(40334044,40772137,40725009)联合资助

摘　　要：分布于东昆仑南缘的早三叠世洪水川组系一套由砾岩、砂岩、页岩和鲕粒灰岩等浅海相和河流相沉积物构成的弧前盆地沉积组合。砂岩碎屑组成、重矿物组合、岩石地球化学和古水流综合研究结果表明,洪水川组砂岩物源主要来自于北侧的岛弧带,同时南侧的阿尼玛卿蛇绿混杂带也为其形成提供了部分物源;源区主要出露长英质岩石、变质岩和硅质岩。Early Triassic Hongshuichuan Formation in the southern margin of the East Kunlun Mountains is composed of shallow- marine and nonmarine conglomerate, sandstone, siltstones, shale and oomicrite, which accumulated in a forearc basin. Sandstone detrital modes, heavy mineral assemblages, geochemistry and paleocurrent data indicate that the source of the Hongshuichuan Formation predominately derived from the island-arc northward, and the A＇ nyemaqen ophiolite complex also provided some detritus for the Hongshuichuan Formation. In the source area, there was mainly exposed of felsic rocks, metamorphic rocks and cherts.

关 键 词：早三叠世 洪水川组 源区背景 东昆仑 

分 类 号：P588.213[天文地球—岩石学]