粤西德庆地区晚奥陶世化石的发现及其地质意义  

DISCOVERY OF THE LATE ORDOVICIAN FOSSILS IN DEQING,WESTERN GUANGDONG AND ITS GEOLOGICAL SIGNIFICANCE

作　　者：王志宏[1,2] 纵瑞文 牛志军[1,2] 林小明 李出安 严成文 宋芳[1,5] 何垚砚[2,5] WANG Zhi-hong;ZONG Rui-wen;NIU Zhi-jun;LIN Xiao-ming;LI Chu-an;YAN Cheng-wen;SONG Fang;HE Yao-yan(Wuhan Center of China Geological Survey, Wuhan 430205;Key Laboratory for Paleontology and Coevolution of Life and Environment, CGS, Wuhan 430205;State Key Laboratory of Biogeology and Environmental Geology,China University of Geosciences, Wuhan 430074;Guangdong Geologic Survey Institute, Guangzhou 510080;Institute of Geological Survey, China University of Geosciences, Wuhan 430074)

机构地区：[1]中国地质调查局武汉地质调查中心,湖北武汉430205 [2]中国地质调查局古生物与生命-环境协同演化重点实验室,湖北武汉430205 [3]中国地质大学(武汉)生物地质与环境地质国家重点实验室,湖北武汉430074 [4]广东省地质调查院,广东广州510080 [5]中国地质大学(武汉)地质调查院,湖北武汉430074

出　　处：《地层学杂志》2019年第2期181-187,共7页Journal of Stratigraphy

基　　金：国家自然科学基金项目(41772019);中国地质调查局项目(DD20190047);中国博士后科学基金(2017M612537)联合资助

摘　　要：本文介绍了广东西部德庆地区近年来新发现的一个晚奥陶世动物群,包括化石产出层位、生物组合类群及其科学意义。该动物群产自原划分为中奥陶世东冲组的地层内,化石产出层位岩性为泥质粉砂岩,动物类群以三叶虫为主,伴生有腕足动物、棘皮动物及少量短剑类化石,化石保存多较破碎,仅少部分保存较好,分布非常集中,结合野外露头与沉积相特征,其沉积环境为正常浪基面至风暴浪基面间的高能滨浅海环境。该动物群的发现,不仅厘定了这套地层时代,而且丰富了粤西地区晚奥陶世的生物组合面貌,为该地区奥陶系的划分对比和区域地质演化研究提供了新资料。This paper reports a newly discovered Late Ordovician fauna in Deqing, western Guangdong. The argillaceous siltstone yielding the fauna was previously assigned to the Middle Ordovician Dongchong Formation, but is here redefined to the Late Ordovician Lanweng Formation. The fauna consists mainly of trilobites, accompanied by brachiopods, echinoderms and machaeridians. The fossils are only founded in certain layers and are mostly fragmental. Fossil preservation and sedimentary features suggest a high-energy sedimentary environment ranging from the fairweather wave-base to the storm wave-base. The discovery of this fauna not only provided new information for the stratigraphic subdivision and correaltion, but also enriched the Late Ordovician biodiversity in the area.

关 键 词：生物组合 三叶虫 兰瓮组 晚奥陶世 云开地区 粤西 

分 类 号：P534.42[天文地球—古生物学与地层学]