Paleoweathering and paleoenvironmental change recorded in lacustrine sediments of the early to middle Eocene in Fushun Basin, Northeast China

Chen Zuoling; Ding Zhongli; Tang Zihua; Yang Shiling; Wang Xu; Cui Linlin

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Paleoweathering and paleoenvironmental change recorded in lacustrine sediments of the early to middle Eocene in Fushun Basin, Northeast China

机译：在中国东北抚顺盆地的早期中期占地面积的湖泊沉积物中记录了古环境和古环境变化

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Deciphering the long-term interaction among continental silicate weathering, global climate, and atmospheric CO2 concentrations is helpful in understanding the mechanisms of the Cenozoic climate change and accessing the future climatic and environmental response to anthropogenic carbon emissions. The Eocene, which is characterized by the Early Eocene Climatic Optimum (EECO) and the following global cooling, represents an ideal test case. Here we generate geochemical data of the Eocene lacustrine sediments from the Fushun Basin, northeast China, to explore the regional climatic response to the global climate change. The chemical index of alteration (CIA) and plagioclase index of alteration (PIA) consistently show a gradual, long-term decrease, indicating a climatic transition from warm and humid to relatively cold and arid during the Eocene in the Fushun Basin. This climatic trend is broadly coincident with the global cooling and decreasing CO2 concentration, implying that the regional climate is closely correlated with the global climate change over geological time scales. Additionally, the extreme silicate weathering and high lake productivity as reflected by relatively positive C-13 values of lacustrine organic matter are associated with the EECO. This consistency may demonstrate that enhanced continental weathering and lake productivity had served as effective sinks to lower atmospheric CO2 across the EECO. Collectively, our new geochemical data add supporting evidence for a long-term, close coupling among continental silicate weathering, climate, and global carbon cycle during the Eocene.

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来源
《Geochemistry, geophysics, geosystems》 |2017年第1期|共11页
作者
Chen Zuoling; Ding Zhongli; Tang Zihua; Yang Shiling; Wang Xu; Cui Linlin;
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作者单位

Chinese Acad Sci Inst Geol &

Geophys Key Lab Cenozo Geol &

Environm Beijing Peoples R China;

Chinese Acad Sci Inst Geol &

Geophys Key Lab Cenozo Geol &

Environm Beijing Peoples R China;

Chinese Acad Sci Inst Geol &

Geophys Key Lab Cenozo Geol &

Environm Beijing Peoples R China;

Chinese Acad Sci Inst Geol &

Geophys Key Lab Cenozo Geol &

Environm Beijing Peoples R China;

Chinese Acad Sci Inst Geol &

Geophys Key Lab Cenozo Geol &

Environm Beijing Peoples R China;

Chinese Acad Sci Inst Geol &

Geophys Key Lab Cenozo Geol &

Environm Beijing Peoples R China;

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原文格式 PDF
正文语种 eng
中图分类地球物理学;
关键词
paleoweathering; Eocene; carbon cycle; global change; Fushun Basin;

机译：荒野;eocene;碳循环;全球变化;抚顺盆地;

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Paleoweathering and paleoenvironmental change recorded in lacustrine sediments of the early to middle Eocene in Fushun Basin, Northeast China

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