白垩纪—古近纪界限时期的陆地气候重建进展
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本文为国家自然科学基金项目(编号42072116,41888101)和国家重点研发计划项目课题(编号2018YFE0204204)联合资助的成果


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

    白垩纪—古近纪(K- Pg)界限时期发生了地质历史中最严重的生物大灭绝事件之一,重建该时期气候演化历史及其对生态系统的影响对理解深时气候演化规律和预测未来气候变化都具有重要意义。相比海相剖面而言,基于陆相剖面的白垩纪—古近纪界限时期古气候重建研究开展较晚,相关成果缺乏系统总结和集成。本文系统回顾了全球陆相白垩纪—古近纪界限剖面的分布情况和事件年代学新进展,总结了基于以上剖面重建的定量古气候记录和德干火山喷发记录,建立了界限时期中纬度陆地年平均温度和大气CO2浓度时间演化序列。陆相剖面分布相对集中且数量较少,中国是该时期陆相剖面发育最多的国家之一,多个盆地已经建立了德干火山喷发记录,在重建该时期陆地气候上具有很大潜力。基于陆相沉积物汞元素地球化学记录表明,德干火山作用导致了晚马斯特里赫特期变暖事件并触发了白垩纪末期生物大灭绝。中纬度陆地年平均温度重建结果显示马斯特里赫特期中期全球经历了~10℃的降温,到马斯特里赫特期晚期德干火山初始喷发前显著升温至~20℃,并在白垩纪—古近纪界限前后发生多次快速波动。尽管65~63 Ma之间陆地温度记录相对缺失,69~65 Ma之间重建的大气CO2浓度记录与陆地年平均温度记录之间具有良好的耦合性,表明白垩纪—古近纪界限时期大气CO2浓度变化是全球温度变化的主要驱动因素。

    Abstract:

    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 Deccan 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℃ in the middle Maastrichtian, and increased significantly to ~20℃ 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.

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顾雪,赵晓梅,殷艺天,于欣鹭,张来明.2023.白垩纪—古近纪界限时期的陆地气候重建进展[J].地质学报,97(9):3116-3131.
GU Xue, ZHAO Xiaomei, YIN Yitian, YU Xinlu, ZHANG Laiming.2023. Progress in terrestrial paleoclimate reconstruction during the Cretaceous- Paleogene boundary interval[J]. Acta Geologica Sinica,97(9):3116-3131.

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  • 收稿日期:2023-05-31
  • 最后修改日期:2023-07-17
  • 在线发布日期: 2023-10-10