黔南上司地区石炭系有孔虫:兼论华南维宪阶有孔虫生物地层序列  

Carboniferous foraminifers from the Shangsi area in southern Guizhou and the Visean foraminiferal succession in South China

作　　者：沈阳[1,2] 王训练 李玉坤[4] 杨志华 岑武轩[3] 王雪兵 SHEN Yang;WANG Xunlian;LI Yukun;YANG Zhihua;CEN Wuxuan;WANG Xuebing(Museum of China University of Geosciences(Beijing),Beijing 100083,China;State Key Laboratory of Palaeobiology and Stratigraphy,Nanjing Institute of Geology and Palaeontology,Chinese Academy of Sciences,Nanjing 210008,China;School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083,China;Guangxi Institute of Geological Survey,Nanning 530023,China)

机构地区：[1]中国地质大学(北京)博物馆,北京100083 [2]中国科学院南京地质古生物研究所现代古生物学和地层学国家重点实验室,江苏南京210008 [3]中国地质大学(北京)地球科学与资源学院,北京100083 [4]广西壮族自治区地质调查院,广西南宁530023

出　　处：《地学前缘》2020年第6期213-233,共21页Earth Science Frontiers

基　　金：国家自然科学基金项目(41702023);现代古生物学和地层学国家重点实验室(中国科学院南京地质古生物研究所)开放基金项目(173122);中央高校基本科研业务费专项资金项目(53200759040);中国地质调查局项目(DD20189612)。

摘　　要：石炭纪时期有孔虫具有演化快、分布广、数量丰富、分异度高的特点,对于地层的划分对比具有极为重要的意义。与全球其他重要的石炭纪沉积区相比,华南有孔虫生物地层划分精度相对较低。本文首次较为系统地报道了华南石炭系代表性岩石地层单位旧司组和上司组下部丰富的有孔虫化石及其在剖面上的分布情况,并综合现有关于华南的有孔虫化石资料,将华南维宪阶划分为7个有孔虫化石带,自下而上分别为Eoparastaffella simplex带、Viseidiscus/Planoarchaediscus带、Paraarchaediscus带、Pojarkovella nibelis带、Koskinotextularia带、Bradyina带和Janischewskina带。这些有孔虫带可与全球其他典型的石炭纪沉积区进行很好的对比,从而为相关的研究提供一个较为精细的地层格架。通过对黔南上司地区有孔虫的研究,提议中国石炭系区域性年代地层单位上司阶底界可用有孔虫Bradyina的首现定义,并将上司阶与西欧的Warnantian亚阶中上部和俄罗斯的Aleksinian亚阶—Venevian亚阶对比,对应国际维宪阶上部,为全球石炭系年代地层对比提供了可靠的化石依据。Abundant and highly diversified foraminifers were widely distributed in the Carboniferous period with high evolutionary rate,which is of great significance to the stratigraphic division and correlation.Compared with some important Carboniferous sedimentary regions in the world,the accuracy of the foraminiferal biostratigraphic division in South China is relatively low.We report in this paper on the abundant foraminifers from the Jiusi Formation and from the lower part of the Shangsi Formation,both are token as the representative lithostratigraphic units of the Carboniferous system in South China.Based on the existing data of foraminifers,seven foraminiferal zones are recognized in the Visean stage of South China.In ascending order,they are the Eoparastaffella simplex,Viseidiscus/Planoarchaediscus,Paraarchaediscus Zone,Pojarkovella nibelis,Koskinotextularia,Bradyina,and Janischewskina Zones.These foraminiferal zones can be well correlated with other typical Carboniferous sedimentary regions in the world,thus providing a high-resolution stratigraphic framework for related studies.Based on the study of foraminifers from the Shangsi area,we propose that the first appearance of foraminifer Bradyina can be used as a biostratigraphic criterion to define the base of the Shangsian Stage,a regional chronostratigraphic unit of the Carboniferous system in China.Moreover,the Shangsian Stage can be correlated to the middle and upper parts of the Warnantian Substage in Western Europe or to the Aleksinian Venevian Substage in Russia.Altogether it provides reliable fossil evidence for the regional chronostratigraphic unit correlation of the Carboniferous system worldwide.

关 键 词：有孔虫 生物地层 上司阶 维宪阶 石炭系 华南 

分 类 号：P52[天文地球—古生物学与地层学] P534.45[天文地球—地质学]