岩石矿物学杂志2025，Vol.44Issue(4)：839-854,16.DOI:10.20086/j.cnki.yskw.2025.4062
塔里木盆地始新统卡拉塔组极热事件记录
Records of extreme heat events from the Eocene Karatal Formation in the Tarim Basin
摘要
Abstract
The Paleocene to Early Eocene was an important climate transition period in the Cenozoic Era,with mul-tiple extreme heat events leading to a weakening of the earth's surface carbon sink capacity and fluctuations in sea levels.Since the Eocene epoch,marine sediment has been recorded in only three areas in China,and the Karatal Formation in southwest Tarim retains a complete record of marine transgression during this period,making it an im-portant stratum for studying the Cenozoic paleoclimate and the evolution of the paleo-Tethys Ocean.This article fo-cuses on the study of extreme climate sedimentary characteristics recorded by the Karatal Formation.The results show that:① the Karatal Formation records a reliable astronomical cycle,with a depositional duration of 6.6 Ma,consistent with the Lutetai Stage;② Five components of the storm sequence,namely grain sequence bedding,par-allel bedding,mound cross bedding,wavy bedding and massive mudstone,observed in the Kalatal Formation,indicating that the Tarim Basin was in the tropical-subtropical low-latitude area where storms frequently occurred during the sedimentary period;③ Affected by differences in sedimentary facies and hydrodynamics,10 types of oo-ids have developed,including radial ooid,concentric ooid,superficial ooid,complex ooid,elliptical ooid,and ec-centric ooid of primary sedimentary origin,as well as micritic ooid,deformed ooid,negative ooid,and dolomitized ooid of secondary alteration origin.In the middle Eocene,abnormal climate events pushed up sea level and seawa-ter entered the Tarim Basin,which lasted until the end of the Lutetai Stage.During the sedimentation period,un-der the control of greenhouse effect,storms occurred frequently,CO2 concentration increased,seawater evaporation increased,and continental weathering intensified.The long-term deterioration of the environment resulted in oppor-tunistic selection characteristics of biological fossils.This article supplements the research on abnormal climate in the Cenozoic era in China with evidence from marine profiles.关键词
塔里木盆地/卡拉塔尔组/风暴作用/鲕粒/极热事件Key words
Tarim Basin/Karatal Formation/storm action/ooid/extreme heat events分类
天文与地球科学引用本文复制引用
张现军,刘宣威,王睦童,姜福杰,王东辰,燕卓越,陈君青,孙海涛,张京伟..塔里木盆地始新统卡拉塔组极热事件记录[J].岩石矿物学杂志,2025,44(4):839-854,16.基金项目
国家自然科学基金项目(41872128) National Natural Science Foundation of China(41872128) （41872128）
