贵州六枝郎岱中下侏罗统成岩特征与上覆剥蚀厚度的推断

DIAGENETIC CHARACTERS OF MIDDLE-LOWER JURASSIC SYSTEMS AND THE DENUDED THICKNESS OF OVERLYING SEQUENCES IN LIUZHILANGDAI AREA, GUIZHOU PROVINCE

胡惟元 刘树辉 邹志福

Hu Weiyuan Liu Shuhui Zou Zhifu

地质矿产部○五项目工程处

No.5 Project Division, Ministry of Geology and Mineral Resources

本文叙述了中、下侏罗统泥岩、自流井群砂岩、沙溪庙组长石砂岩的成岩特征并对成岩作用的阶段作了划分。鉴论已剥蚀地层存在时对下伏地层施加了若干影响,一些以成岩标志留在残留地层中,在研究这些成岩标志的基础上,通过与已知埋深地区的相应成岩标志类比,推断本区剥蚀地层厚度约为1800m。

The diagenetic characters and the diagenesis stages of Middle and Lower Jurassic mudstones, Zhiliujin Group quartzose sandstones and Shaxi For-mation feldspathic sandstones in Liuzhilangdai Area, Guizhou Province are described in this paper. Since the denuded sequence would influence on the underlying strata before the denudation,some diagenetic marks would be surely remained in the residual strata. According to the analysis of the diagenetic marks and the correlation to relative diagenetic marks in certain known burial depth area, the thickness of denuded strata are deducted as 1800 meters in this area.

https://doi.org/10.11781/sysydz198703259