城巴断块震旦系陡山沱组地层对比与划分及沉积相研究

Stratigraphic correlation and division and sedimentary facies of the Sinian Doushantuo Formation in Chengba Fault Block

研究城巴断块震旦系陡山沱组沉积相及地层对比与划分,旨在为探讨陡山沱组黑色岩系成矿性打下基础。通过野外观测和室内综合研究,结合区域地层对比,明月剖面的第一、二段大致相当于川西观音崖组第一段的滨海相沉积,第三段大致相当于峡东剖面第二段的深水相沉积,第四段的条带状白云岩组合和川西剖面及峡东剖面基本一致。将明月地区陡山沱期的沉积相模式归结为浅海陆棚盆地—水下隆起带—次深海陆棚边缘盆地的模式,为下一步找矿指明了方向。

By studying the stratigraphic correlation and division and sedimentary facies of the Sinian Doushantuo Formation in the Chengba Fault Block,the paper aims to prepare for discussing the mineralization of the black lithology of the targeted formation. With field observation and desk study of the stratigraphic correlation,it is found out that the sedimentary facies of the first and the second parts of the Mingyue section are roughly corresponding to the littoral facies deposit of the first Member of the Guanyinya Formation in Chuanxi section; the sedimentary facies of its third part is roughly corresponding to the deep-water facies deposit of the second part of the Shaandong section; the stripped dolomite pack of its fourth part is basically identical to the that of the Chuanxi section and Shaandong section. It is concluded that the sedimentary facies model is neritic shelf basin-submarine uplift belt-bathyal shelf marginal basin,which could guide future prospecting.