黔西水城长兴期晚期生物与环境突变响应:基于古生物学和地球化学证据  

Response of biological and environmental catastrophe in the late Changhsingian in Shuicheng area,western Guizhou,China:evidence based on paleontology and geochemistry

作　　者：党志英 沈玉林[1,2] 杨天洋 金军[1,2,3] 赵勇 DANG Zhiying;SHEN Yulin;YANG Tianyang;JIN Jun;ZHAO Yong(School of Resources and Geosciences,China University of Mining and Technology,Jiangsu Xuzhou 221008,China;Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process,Ministry of Education,Jiangsu Xuzhou 221008,China;Guizhou Engineering Technology Research Center for Coalbed Methane and Shale Gas,Guiyang 550081,China;Sinopec Xinjiang Xinchun Petroleum Development Co.,Ltd,Shandong Dongying 257000,China)

机构地区：[1]中国矿业大学资源与地球科学学院,江苏徐州221008 [2]煤层气资源与成藏过程教育部重点实验室,江苏徐州221008 [3]贵州省煤层气页岩气工程技术研究中心,贵州贵阳550081 [4]中国石化新疆新春石油开发有限责任公司,山东东营257000

出　　处：《古地理学报》2023年第6期1421-1436,共16页Journal of Palaeogeography：Chinese Edition

基　　金：国家自然科学基金项目(编号:42172186,41872168);国家重点研发计划项目(编号:2021YFC2902002)联合资助。

摘　　要：微体化石和地球化学数据的综合应用在重建古环境的研究中发挥着重要的作用。黔西水城地区上二叠统长兴组可见钙质藻类、有孔虫、腕足类、腹足类、双壳类、海百合、介形虫和海胆等化石,以钙质藻类和浮游有孔虫最为丰富多样。基于古生物分布特征,结合全岩微量元素(Rb、Cu、Sr/Ba、V/(V+Ni)、Ni/Co、V/Cr、Zr/Rb、(Zr+Rb)/Sr和Rb/Sr)和生物壳体的微量元素(Mg/Ca、Sr/Ca、B/Ca、Fe/Mn和^(87)Sr/^(86)Sr)分析结果,发现研究区长兴期晚期生物对环境演化较为敏感,Hindeodus changxingensis-Clarkina zhejiangensis带(长兴期晚期,约251.9 Ma)的古气候和生物演化快速变化,短时间内发生了生物数量锐减至消失、水体盐度剧增、气温突然升高以及从海退转为快速海侵的一系列变化。推测在二叠纪末生物大灭绝事件中,短期的、快速的和极端的多重相互作用(盐度、温度和快速的海侵事件等)产生的环境突变可能是当时海洋生物遭受沉重打击的主要诱因。The comprehensive application of microfossils and geochemistry plays an important role in the reconstruction of paleoenvironments.Abundant biological fossils,such as calcareous algae,foraminifers,brachiopods,gastropods,bivalves,crinoids,ostracods,and echinoids,were developed in the marine carbonates of the Late Permian Changhsingian in the Shuicheng area of western Guizhou,and calcareous algae and foraminifers are the most abundant species.In this paper,the distribution characteristics of fossils,whole-rock trace elements(Rb,Cu,Sr/Ba,V/(V+Ni),Ni/Co,V/Cr,Zr/Rb,(Zr+Rb)/Sr,and Rb/Sr)and trace element analysis of biogenic shells(Mg/Ca,Sr/Ca,B/Ca,Fe/Mn and ^(87)Sr/^(86)Sr)were studied.It was found that biological evolution was sensitive to paleoclimate variation.During the Hindeodus changxingensis-Clarkina zhejiangensis(ca.251.9 Ma),there was a rapid variation in paleoclimate and marine organisms,and biotic groups declined sharply to disappear in a short time.Meanwhile,a series of variations occurred,including a dramatic increase in water salinity,sudden warming,and a shift from regression to a rapid transgression process.It was speculated that the interactions among salinity,temperature and rapid transgression-regression events led to climate change,which was the main reason for the extinction of marine life in the Late Permian.

关 键 词：古生物 古盐度 古气候 二叠纪末 长兴组 

分 类 号：P534.46[天文地球—古生物学与地层学]