Phanerozoic oceanic and climatic perturbations in the context of Tethyan evolution  

作　　者：Li TIAN Haijun SONG Yuchu LIU Yuyang WU Daoliang CHU Huyue SONG 

机构地区：[1]State Key Laboratory of Biogeology and Environmental Geology,School of Earth Sciences,China University of Geosciences(Wuhan),Wuhan 430074,China

出　　处：《Science China Earth Sciences》2023年第12期2791-2806,共16页中国科学（地球科学英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos.92155201,42272361);China Geological Survey (The Establishment of Chinese Stratigraphic Standards Project)。

摘　　要：Climatic and environmental conditions play a pivotal role in the evolution of the biosphere,serving as the primary natural factors influencing biological evolution and the development of human civilization.The study of the evolution of Earth's habitability primarily revolves around the reconstruction of climatic and oceanic conditions in geohistorical periods,shedding light on their dynamic changes.This paper collates classic geological indicators and geochemical proxies associated with paleoclimatic and oceanic environmental conditions.The latest“big data”analyses and simulations made possible by the availability of previously unimagined massive datasets reveal several key findings:During the early Paleozoic,atmospheric oxygen levels were low,and widespread oceanic anoxia was prevalent;the Devonian era witnessed a greenhouse climate,followed by the Carboniferous ice age characterized by higher oceanic oxidation levels and alkalinity.The latest Paleozoic deglaciation occurred under high pCO_(2) conditions,extending into much of the Mesozoic and early Cenozoic,marked by multiple hyperthermal and anoxia expansion events,until the resurgence of global glaciation in the middle-late stages of the Cenozoic,ultimately bringing environmental and climatic conditions closer to modern levels.By correlating the aforementioned long-term trends with major geological events,we can delineate the co-evolution of paleoclimate and oceanic environments in tandem with the development of Tethys tectonics as follows.(1)During the Proto-Tethys stage,global paleo-elevations were relatively low,and atmospheric oxygen levels were also relatively modest.Despite the occurrence of significant tectonic movements that led to noticeable transgressive-regressive cycles,their effects on climate and oceanic environments were somewhat limited due to the relatively weak interactions.(2)The emergence of the Paleo-Tethys was a significant event that coincided with the formation of the supercontinent Pangaea.Intensive orogenic movements during this

关 键 词：Paleo-temperature Paleo-redox Paleo-pH Tectonic movements Earth's habitability 

分 类 号：P542[天文地球—构造地质学] P53[天文地球—地质学]