广西恭城奥陶纪笔石动物群特征与沉积环境  

Ordovician graptolite fauna characteristics and sedimentary environment of Gongcheng, Guangxi, China

作　　者：唐兰[1] 

机构地区：[1]中国地质大学地球科学与资源环境学院

出　　处：《成都理工大学学报（自然科学版）》2005年第2期177-181,共5页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：广西青年科学基金资助项目(9811714)

摘　　要：论述桂北恭城奥陶纪笔石动物群特征及其岩性岩相特点。该笔石动物群属于华南型的珠江亚型,具有典型的太平洋型动物群的特点。奥陶系总体由一套具复理石建造特征的砂岩、板岩组成,自下而上为:黄隘组、升坪组及田岭口组。笔石组合特征及岩相特点表明早奥陶世到中奥陶世早期该区为一快速堆积的槽盆沉积环境。中奥陶世黑色的笔石页岩为典型的半封闭缺氧的深水沉积环境,反映了海水逐步加深,水体也变得相对宁静。The present paper discusses the Ordovician graptolite fauna and depositiona characteristics in Gongcheng, Guangxi. The graptolite fauna belongs to the Zhujiang sub-form of Huanan form with typical characteristics of the Pacific graptolite fauna. The Ordovician rocks consist of argillaceous flyschiod. In ascending order, they are Huang’ai Formation, Shengping Formation and Tianlingkou Formation. The graptolite fauna and depositional characteristics indicate that in the Yushanian and the basin was an active tectonic one and then the water body became relatively tranquil and increasing in depth. The black graptolite shale facies indicate a deep-water, half enclosed and anoxic sedimentary environment.

关 键 词：笔石动物群 奥陶纪 恭城 广西 深水沉积环境 中奥陶世 岩性岩相 建造特征 早奥陶世 组合特征 特点 华南型 太平洋 复理石 奥陶系 半封闭 砂岩 板岩 堆积 页岩 海水 

分 类 号：P534.43[天文地球—古生物学与地层学] P534.42[天文地球—地质学]