白垩纪中期热室地球陆地古气候研究进展  

ADVANCES IN RESEARCH ON TERRESTRIAL PALEOCLIMATE IN THE MID-CRETACEOUS HOTHOUSE EARTH

作　　者：杨柳[1] 高远[1] 毋正轩 张琪[1] YANG Liu;GAO Yuan;WU Zhengxuan;ZHANG Qi(School of Earth Sciences and Resources,China University of Geosciences(Beijing),Beijing 100083)

机构地区：[1]中国地质大学(北京)地球科学与资源学院,北京100083

出　　处：《第四纪研究》2024年第5期1188-1204,共17页Quaternary Sciences

基　　金：国家重点研发计划项目(批准号:2022YFF0800804);国家自然科学基金项目(批准号:42222207)共同资助。

摘　　要：白垩纪中期(约125~80 Ma)是过去150 Ma以来温度最高的极端温室气候时期,也被称为“热室地球”时期。本研究对全球白垩纪中期陆地古气候研究进行了系统梳理,根据其研究内容及方法进行了分类。通过总结分析陆地温度、降水的定量重建数据,发现在约100 Ma时陆地温度开始上升,在Cenomanian末期达到温度最高值(中纬度约14~26℃;高纬度约8~18℃);而降水记录由于受地形等众多因素的影响,并没有显示出明显的趋势,仅能看出在Cenomanian期约100 Ma起,随着温度的逐渐升高,降水量也呈现增多的趋势。进一步与白垩纪中期全球海相温度记录进行对比,发现陆地气候与海相气候具有基本一致的变化趋势,即在Cenomanian初期约100 Ma时海-陆温度都具有明显上升,在Cenomanian-Turonian界限附近达到最高值。当前的白垩纪中期陆地古气候研究也存在一些不足,如定量古气候数据相对较少、缺乏连续和高分辨率陆地古气候记录等。松辽盆地国际大陆科学钻探获得了白垩纪约118~80 Ma累计约6000 m近乎连续的陆相岩芯,为研究热室地球陆地古气候变化提供了重要的地质资料,未来有望建立连续且高分辨率的白垩纪中期陆地古气候记录,探索热室地球气候运作机制。The mid-Cretaceous period(ca.125~80 Ma)was the extreme greenhouse period since the last 150 Ma,also known as the"hothouse Earth"period.In this paper,the current global terrestrial paleoclimate researches in the mid-Cretaceous are systematically reviewed and classified according to their research contents and methods.By summarizing and analyzing the quantitative data of terrestrial temperature and precipitation,it is found that the land temperature increased at about 100 Ma and reached the maximum value at the end of Cenomanian(14~26℃in the middle latitude;8~18℃in the high latitude).However,due to various factors such as topography,the precipitation records did not exhibit a clear trend.Notably,starting from around 100 Ma during the Cenomanian period,precipitation showed an increasing trend alongside the gradual rise in temperature.Further comparison with the global marine temperature records of the mid-Cretaceous shows that the terrestrial climate and marine climate had the same changing trend,which is the marine-terrestrial temperature rose in the early Cenomanian,and reached the highest value near the Cenomanian-Turonian boundary.The current terrestrial paleoclimate researches in the mid-Cretaceous also have some shortcomings,such as relatively few quantitative paleoclimate data and lack of continuous and high-resolution terrestrial paleoclimate records.The International Continental Scientific Drilling of the Songliao Basin has obtained approximately 6000-meter of nearly continuous terrestrial cores from the Cretaceous period(about 118~80 Ma),providing important geological data for the study of terrestrial paleoclimate changes in the hothouse Earth.In the future,it is expected to establish continuous and high-resolution terrestrial paleoclimate records in the mid-Cretaceous and explore the mechanism of the hothouse Earth climate.

关 键 词：白垩纪中期 热室地球 古气候 陆相 

分 类 号：P534.53[天文地球—古生物学与地层学] P532[天文地球—地质学]