Paleocene-Eocene Thermal Maximum lacustrine sediments in deep drill core SKD1 in the Jianghan Basin: A record of enhanced precipitation in central China
Paleocene-Eocene Thermal Maximum lacustrine sediments in deep drill core SKD1 in the Jianghan Basin: A record of enhanced precipitation in central China
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江汉盆地深钻岩心SKD1古新世-始新世热最大湖相沉积：中国中部地区降水增强的记录
DOI：
10.1016/j.gloplacha.2021.103620
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发表时间：
2021-10
影响因子：
3.9
通讯作者：
Zeng Luo
中科院分区：
文献类型：
--
作者：
Xiaohua Teng;Chunlian Wang;Chenglin Liu;Kai Yan;Zeng Luo
全球变暖对全球和区域水文循环产生重大影响，预计将加剧各区域降雨量分布不均，从而影响与水有关的人类活动（例如，农业）和人类社会的发展，特别是在人口稠密的东亚。古新世-始新世热盛期（PETM）是古近纪以来研究最多、影响最大的高温事件，其特征是全球变暖迅速而极端，并造成强烈的环境效应，是预测未来全球变暖对水文情势影响的一个类比。然而，在PETM降水的矛盾的影响/模式，限制了我们的水文响应全球变暖的理解。此外，与海洋记录相比，PETM的大陆沉积记录非常有限，大多数通常仅限于风化，通常不连续的露头暴露，亚洲缺乏环境扰动的相关记录。本文首次详细记录了江汉盆地古近系的古近系演化过程，揭示了古近系的环境和水文变化。根据SKD 1孔深湖相碳酸盐岩（主要为方解石和白云岩）的高分辨率碳、氧同位素特征，确定了沙市组和新沟嘴组边界的古近系古近系事件。碳酸盐（δ 13 Ccarb）和方解石（δ 13 Ccalcite）的碳同位素值在古新世晚期出现了较大的负偏移（分别为~10.7‰和8.7‰）。碳酸盐（δ 18 Ocarb）和方解石（δ 18 Ocalcite）的氧同位素值也显示出较大的负偏移（分别为7.9‰和6.1‰），表明整个古近系的降水量增加，气候更加湿润，碳酸盐中碳酸盐的消失和方解石的优势证明了这一点。降水量的增加和pCO 2浓度的升高可能导致SKD 1孔δ 13 C碳值的异常大幅度负偏移，并为江汉盆地发现的已知最古老的灵长类动物提供了有利的生存条件。δ 18 O碳和δ 18 O方解石值在古新世时期以上增加，并表现出高频大幅度波动，表明古新世后气候总体上处于干旱状态，气候条件在干湿之间迅速转换。
Global warming has a significant effect on global and regional hydrological cycles and is expected to exacerbate the uneven distribution of rainfall in various regions, thereby influencing water-related human activities (e.g., agriculture) and the development of human society, especially in densely populated East Asia. As an analog to predict the future impact of global warming on hydrological regimes, the Paleocene-Eocene Thermal Maximum (PETM) at ~56 Ma is the most prominent and extensively studied Paleogene hyperthermal event, and it featured rapid and extreme global warming that caused intense environmental effects. However, the contradictory effects/mode of precipitation during the PETM has constrained our understanding of the hydrological response to global warming. Moreover, compared with marine records, continental sedimentary records of the PETM are very limited, and most are typically limited to weathered, often discontinuous, outcrop exposures, and relevant records of environmental perturbations in Asia are lacking. This study presents the first detailed record of the PETM in the Jianghan Basin, central China, and identifies the environmental and hydrological changes across the PETM. Based on high-resolution carbon and oxygen isotopes in the lacustrine carbonates (mainly calcite and dolomite) in the deep drill core SKD1, we identified the PETM event at the boundary of the Shashi and Xingouzui Formations. The carbon isotopic values of carbonate (δ13Ccarb) and calcite (δ13Ccalcite) show large negative excursions (~10.7‰ and 8.7‰, respectively) during the PETM. The oxygen isotopic values of carbonate (δ18Ocarb) and calcite (δ18Ocalcite) also show large negative excursions (7.9‰ and 6.1‰, respectively), indicating increased precipitation and a wetter climate across the PETM, as evidenced by the disappearance of evaporites and the dominance of calcite in the carbonates. Increased precipitation with elevated pCO2concentration might have caused the anomalous large negative excursion of theδ13Ccarbvalues in the SKD1 core and provided favorable living conditions for the oldest known primate, whose fossil was found in the Jianghan Basin. Theδ18Ocarbandδ18Ocalcitevalues increase and show high-frequency and large-amplitude fluctuations above the PETM interval, indicating rapid shifts between wet and dry climatic conditions in an overall arid climate after the PETM.
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影响因子：
0.9
作者：
Z. Şen
通讯作者：
Z. Şen
DOI：
10.2208/prohe.49.493
发表时间：
2005-02
期刊：
Doboku Gakkai Ronbunshuu B
影响因子：
--
作者：
K. Wada;M. Murase;Y. Tomizawa
通讯作者：
K. Wada;M. Murase;Y. Tomizawa
中国古新世-始新世热极增温对降水空间变化的响应
影响因子：
3.9
作者：
Chen, Zuoling;Dong, Xinxin;Ding, Zhongli
通讯作者：
Ding, Zhongli
DOI：
10.1016/s0031-0182(04)00307-4
发表时间：
2004-09
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
--
作者：
C. Garzione;C. Garzione;D. Dettman;D. Dettman;B. Horton
通讯作者：
C. Garzione;C. Garzione;D. Dettman;D. Dettman;B. Horton
影响因子：
4.3
作者：
A. Sluijs;P. Bijl;Stefan Schouten;U. Röhl;G. Reichart;H. Brinkhuis
通讯作者：
A. Sluijs;P. Bijl;Stefan Schouten;U. Röhl;G. Reichart;H. Brinkhuis