Progress in terrestrial paleoclimate reconstruction during the Cretaceous-Paleogene boundary interval

被引：0
|
作者：
Gu X. [1 ]
Zhao X. [1 ]
Yin Y. [1 ]
Yu X. [1 ]
Zhang L. [1 ]
机构：
[1] State Key Laboratory of Biogeology and Environmental Geology, School of Earth Sciences and Resources, China University of Geosciences (Beijing), Beijing
来源：
Dizhi Xuebao/Acta Geologica Sinica | 2023年 / 97卷 / 09期
关键词：
Cretaceous-Paleogene boundary; Deccan volcanism; paleo-atmospheric CO[!sub]2[!/sub]concentration; paleotemperature; terrestrial paleoclimate;
D O I：
10.19762/j.cnki.dizhixuebao.2023031
中图分类号：
学科分类号：
摘要：
One of the most catastrophic mass extinction events in geological history occurred during the Cretaceous-Paleogene (K-Pg) boundary interval. The reconstruction of the climate evolution and its impact on the ecosystem during this period is of great significance for understanding the climate evolution of deep time and predicting future climate change. Compared with marine sections, the paleoclimate reconstructions based on terrestrial sections were slower and lacked systematic summary and compilation. In this study, we systematically review the distribution of terrestrial K-Pg boundary sections and the progress of event chronology during the K-Pg boundary interval, summarize the quantitative terrestrial paleoclimate records and the Deccan Traps eruption records, establish the mean annual terrestrial temperature of mid-latitudes and atmospheric CO2 concentration. The distribution of terrestrial sections is relatively limited. China is one of the countries with the largest number of terrestrial K-Pg boundary sections, several basins have established Deccan eruption records, which has great potential for reconstructing the terrestrial climate during this period. The mercury geochemistry in terrestrial sediments suggest that Dcccan volcanism caused the Late Maastrichtian Warming Event and triggered the end-Cretaceous mass extinction. The reconstruction results of the mean annual terrestrial temperature of mid-latitudes show that the global temperature decreased by ~10°C in the middle Maastrichtian, and increased significantly to ~20°C before the initial eruption of Deccan Traps in the late Maastrichtian, with multiple fluctuations across the K-Pg boundary. Although the terrestrial temperature records between 65~63 Ma are relatively absent, the coupling between atmospheric CO2 concentration and global mean annual terrestrial temperature from 69 ~ 65 Ma complicated in this study suggests that atmospheric CO2 concentration was the main driver of global temperature variation during the K-Pg boundary interval. © 2023 Geological Society of China. All rights reserved.
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页码：3116 / 3131
页数：15
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