扬子地台北缘寒武纪同沉积断裂控制的斜坡沉积特征*

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。

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

Based on summarizing regional data and practical investigation，the sedimentary characteristics of the slope controlled by synsedimentary faults were studied.It is found that rock types include pebble clastic 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.Palaeogeographic division was controlled by bordering fault zone，and locations of platform，slope and basin remained stationary during different phases of the Cambrian.Region of the slope subsided in a tension environment，with a continuous increasing accommodation space and plenty of sediments from platform，which resulted in much thicker strata in slope than that in shallow platform and deep basin.