扬子地台北缘寒武纪同沉积断裂控制的斜坡沉积特征  

Sedimentary characteristics of the Cambrian slope controlled by synsedimentary faults in northern margin of Yangtze Platform

作　　者：余宽宏[1] 金振奎[1] 董晓东[1] 苏奎[1] 张伟[1] 杜宏宇[1] 陈英[1] 张卫丹[1] 

机构地区：[1]中国石油大学(北京)地球科学学院,北京102249

出　　处：《古地理学报》2013年第3期401-412,共12页Journal of Palaeogeography：Chinese Edition

基　　金：中国石油化工股份有限公司海相油气前瞻性科研项目(合同编号:YPH08015)成果之一

摘　　要：通过对扬子地台北缘寒武系剖面实测以及前人资料的综合分析,研究了同沉积断裂控制的斜坡沉积特征。斜坡区岩石类型丰富,包括砾屑石灰岩、灰泥石灰岩、硅岩和页岩等,沉积构造丰富,沉积厚度远大于台地区以及深海盆地区。断裂带在宏观上控制了扬子地台北缘寒武纪古地理分区,台地区、斜坡—深海盆地区的古地理位置在寒武纪的不同地质时期基本保持不变。寒武纪持续拉伸的构造环境造成斜坡区持续下降拗陷,从而为沉积物的堆积提供了足够大的可容空间,同时来自台地区的沉积物补给充足,导致了斜坡区相对于台地区以及深海盆地区而言具有巨厚的沉积层。Abstract Based on summarizing regional data and practical investigation, the sedimentary charac- teristics of the slope controlled by synsedimentary faults were studied. It is found that rock types include pebble elastic limestone, micrite, cherts, shale and so on, with abundant sedimentary structures, and the thickness of sedimentary rocks in slope is much larger than that in platform and basin. Palaeogeo- graphic division was controlled by bordering fault zone, and locations of platform, slope and basin re- mained stationary during different phases of the Cambrian. Region of the slope subsided in a tension envi- ronment, with a continuous increasing accommodation space and plenty of sediments from platform, whichresulted in much thicker strata in slope than that in shallow platform and deep basin.

关 键 词：寒武纪 扬子地台北缘 斜坡 同沉积断裂 沉积特征 

分 类 号：P512.2[天文地球—地质学]