北黄海盆地东部坳陷侏罗纪北部物源--沉积体系的岩矿特征  

Mineral and lithological features of north provenance-depositional system of Jurassic in eastern depression of North Yellow Sea Basin

作　　者：宋雪[1] 程日辉[1] 高丹[1] 沈艳杰[1] 王嘹亮[2] 

机构地区：[1]吉林大学地球科学学院,长春130061 [2]广州海洋地质调查局,广州510760

出　　处：《世界地质》2015年第4期1002-1012,共11页World Geology

基　　金：中国地质调查项目(GZH200700405)

摘　　要：以北黄海盆地东部坳陷北部侏罗系为目的层,探讨侏罗纪北部物源-沉积体系的岩矿特征、物源区构造背景和物源方向。研究区侏罗系是一套陆相碎屑岩沉积,主要岩石类型为岩屑石英砂岩和岩屑砂岩。通过对北黄海盆地东部坳陷侏罗系沉积序列的研究,识别出三角洲、扇三角洲和湖泊等3类沉积环境。根据碎屑组分和灰岩丰度可知,北部物源-沉积体系为风化物源,并存在附加的火山物源,物源区为再旋回造山带,沉积体系为自北向南方向的扇三角洲沉积体系。对岩石样品进行微观特征及粒度特征研究,识别出沉积微相类型有扇三角洲前缘亚相的远砂坝、河口坝、水下河道和重力水下河道4种微相。This paper presents the mineral and lithological features,tectonic setting and direction of the north provenance-depositional system of Jurassic,and the Jurassic strata in the north of eastern depression of North Yellow Sea Basin are as a target strata. The Jurassic strata are a set of terrigenous clastic rocks mainly with lithic quartz sandstone and lithic sandstone in type. Studying the sedimentary sequences of eastern depression of North Yellow Sea Basin,the authors identify three kinds of sedimentary environment which contain delta deposit,fan delta deposit and lake deposit. Based on the fragment composition and content of limestone,the north provenance-depositional system is defined as a weathered provenance added by volcanic materials,the provenance is the recycled orogeny and the depositional system is the fan delta system of a direction from north to south. Studying the microscopic and particle characteristics of samples,the authors identify four microfacies in this area including distal-bar,mouth bar,underwater channel and gravity underwater channel of fan delta front subfacies.

关 键 词：物源区 沉积体系 岩屑 矿物成分 侏罗纪 北黄海盆地 

分 类 号：P534.52[天文地球—古生物学与地层学]