燕山地区下寒武统昌平组豹斑状灰岩的古环境意义

<正> 燕山地区的昌平组以豹斑状灰岩为主的碳酸盐岩地层,假整合覆于震旦系青白口统景儿峪组之上,与上覆地层馒头组呈整合接触。昌平组在北京昌平县龙山一带发育最好。项礼文等(1964)在该地昌平组灰岩中发现Palaeolenus fengyangensis Chu和Redlichia sp.     

江西玉山祝宅晚奥陶世地层、沉积特征及环境初探

<正> 江西玉山县城东南约15km处的祝宅,出露着富含壳相化石、以碳酸盐岩相为主的奥陶纪地层。这一地层最早为张利民等于1977年发现,1980年韩乃仁、李罗照等测制剖面,写了“江西玉山祝宅奥陶系剖面”初稿。1985年,陈旭、戎嘉余、李守军在前人工作的基础上进行野外调查,室内研究后草成本文。 本文珊瑚、藻类和层孔虫由邓占球、穆西南和董得源鉴定。刘云做了红外曲线分析,杨荣庆清绘插图,毛继良摄制沉积岩薄片,李懋摄制高岭石的扫描电镜照片,均一并致谢。     

中国西南地区晚震旦世碳酸盐岩与磷块岩的沉积环境

<正> 西南诸省是我国碳酸盐岩最发育的地区。震旦系碳酸盐岩沉积巨厚,出露广泛,分布稳定,矿产丰富,别具特色。其地层记录具有地史发生重要转折阶段的特征。因而探讨其沉积环境对于解决或认识我国南方晚前寒武系的划分对比、岩石成因、地质发展史以及寻找矿产资源都具有一定的意义。为此,自1966年以来,笔者先后对川、黔、滇、湘、鄂西、陕南等省震旦系陡山沱组和灯影组具代表性的地层剖面,进行了野外调查和室内研究。本文仅将碳酸盐岩和磷块岩的简要特征及沉积环境方面的资料予以整理,供今后深入研究参考。     

我国西南地区震旦系灯影组碳酸盐岩石学特征及其储集性

In the present paper a brief account is given of the depositional characteristics,the classification, the deuterodiagenetic changes and the reservior behavior of the carbonate rocks in the Sinian Dengying Formation in Southwest China. The authors have come to the conclusions: (1) During the Dengying age, this region was, as a whole, covered by a vast expanse of epicontinental sea; while in central Sichuan and northern Guizhou spread a great mass of shallow-water carbonate platform, and in western Hunan and Hubeiwas a still water basin. (2) In the Dengying Formation, dolomites are of eonnate deposits. The thallophyta seem apparently to have plaid an important role in the rock-forming and in the reef-building. (3) Thin-bedded algal dolomites with botryoidal structure were deposited on the Siehuan-Guizhou carbonate platform. As characterized by the presence of bedded reef or hicstrome, this type of dolomites is more or less of interest to the study of stratigraphy.     

安徽宿县夹沟及其邻区寒武系海绿石的研究

本文所研究的海绿石,主要采自安徽宿县夹沟寒武系地层的16个层位中,共76个标本。此外还有9个标本采自徐州贾汪徐庄组及其以上的寒武系地层中,1个标本采自宿县驴山馒头组。