右江盆地西北缘中三叠世深水沉积岩相特征及盆地充填样式  

Deep-water Sedimentary Rocks Facies Characteristics and Filling Patterns of the Middle Triassic in the Northwest Margin of Youjiang Basin

作　　者：彭成龙 周鸿 王文明 龚桂源 张德明 跃连红 李月森 PENG Cheng-long;ZHOU Hong;WANG Wen-ming;GONG Gui-yuan;ZHANG De-ming;YUE Lian-hong;LI Yue-sen(Guizhou Geological Survey,Guiyang,Guizhou 550081,China;117 Geological Part,Guzhou Bureau of Geology and Mineral Exploration and Development,Guiyang,Guizhou 550018,China)

机构地区：[1]贵州省地质调查院,贵州贵阳550081 [2]贵州省地矿局117地质大队,贵州贵阳550018

出　　处：《贵州地质》2021年第1期43-50,共8页Guizhou Geology

基　　金：贵州1∶5万册亨县、雅长、八渡、百乐幅地质矿产综合调查(编号:12120115026401);贵州省地质矿产勘查开发局地质科研项目《右江盆地北缘T/P界面附近滑脱构造变形及其对金矿的控制作用—以贵州册亨地区为例》(编号:QDKKH[2020]27);贵州省科技支撑计划平台人才项目(编号:QKHPTRC[2018]5626)共同资助。

摘　　要：右江盆地北西缘中三叠世发育一套巨厚的深水沉积陆源碎屑岩。基于岩相剖面测制、面上地质调查和岩矿鉴定资料,结合前人研究成果,对贵州册亨一带中三叠世许满组-边阳组共识别出6种岩相,叠置构成3种主要岩相组合:岩相组合Ⅰ以砂质碎屑流沉积为主,指示扇根-内扇沉积;相组合Ⅱ代表扇中沉积作用的产物;相组合Ⅲ为外扇沉积作用的产物。盆内发育陆源碎屑水道充填的砂质透镜体及浊积扇体,而靠近台地边缘一侧仅有碳酸盐岩滑塌扇裙,是同生断裂控制的结果。在此基础上,根据区域构造背景,结合物源及古流向等资料,建立了册亨一带盆地充填样式,这对于进一步认识右江盆地中三叠世沉积及演化提供基础资料。A suit of extremely thick deep-water sedimentary clastic rocks developed in the Middle Triassic in the northwest margin of Youjiang Basin. Based on the geological survey,petrographic section and rock chips identification,as well as previous research results,6 types of lithofacies and 3 lithofacies assemblages were identified in Xuman formation and Bianyang formation of Ceheng region in Guizhou Province: Lithofacies assemblage Ⅰ mainly consist of sandy debris flow deposits,indicated the roots to the inner of the submarine fans,and the lithofacies assemblage Ⅱ and Ⅲ represent the middle and the outer fans,respectively. Sandy lens and turbiditic fan filled with clastic channel are widely developed in the basin,and due to the influence of syngenetic faults,the carbonate slide fan is found near the edge of the platform only. According to the tectonic background,provenance and paleoflow data in regional,this study established the filling patterns,which provide basic data for further understanding of the sedimentary evolution of Youjiang Basin.

关 键 词：右江盆地西北缘 中三叠世 岩相特征 充填样式 

分 类 号：P534.51[天文地球—古生物学与地层学] P539.2[天文地球—地质学]