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Extreme weathering/erosion during the Miocene Climatic Optimum: Evidence from sediment record in the South China Sea
Wan, Shiming1,2; Kurschner, Wolfram M.3; Clift, Peter D.4; Li, Anchun1; Li, Tiegang1
2009-10-06
发表期刊GEOPHYSICAL RESEARCH LETTERS
ISSN0094-8276
卷号36页码:L19706
文章类型Article
摘要Investigating the interplay between continental weathering and erosion, climate, and atmospheric CO(2) concentrations is significant in understanding the mechanisms that force the Cenozoic global cooling and predicting the future climatic and environmental response to increasing temperature and CO(2) levels. The Miocene represents an ideal test case as it encompasses two distinct extreme climate periods, the Miocene Climatic Optimum (MCO) with the warmest time since 35 Ma in Earth's history and the transition to the Late Cenozoic icehouse mode with the establishment of the east Antarctic ice sheet. However the precise role of continental weathering during this period of major climate change is poorly understood. Here we show changes in the rates of Miocene continental chemical weathering and physical erosion, which we tracked using the chemical index of alteration ( CIA) and mass accumulation rate ( MAR) respectively from Ocean Drilling Program (ODP) Site 1146 and 1148 in the South China Sea. We found significantly increased CIA values and terrigenous MARs during the MCO (ca. 17-15 Ma) compared to earlier and later periods suggests extreme continental weathering and erosion at that time. Similar high rates were revealed in the early-middle Miocene of Asia, the European Alps, and offshore Angola. This suggests that rapid sedimentation during the MCO was a global erosion event triggered by climate rather than regional tectonic activity. The close coherence of our records with high temperature, strong precipitation, increased burial of organic carbon and elevated atmospheric CO(2) concentration during the MCO argues for long-term, close coupling between continental silicate weathering, erosion, climate and atmospheric CO(2) during the Miocene. Citation: Wan, S., W. M. Kurschner, P. D. Clift, A. Li, and T. Li (2009), Extreme weathering/ erosion during the Miocene Climatic Optimum: Evidence from sediment record in the South China Sea, Geophys. Res. Lett., 36, L19706, doi: 10.1029/2009GL040279.; Investigating the interplay between continental weathering and erosion, climate, and atmospheric CO2 concentrations is significant in understanding the mechanisms that force the Cenozoic global cooling and predicting the future climatic and environmental response to increasing temperature and CO2 levels. The Miocene represents an ideal test case as it encompasses two distinct extreme climate periods, the Miocene Climatic Optimum (MCO) with the warmest time since 35 Ma in Earth's history and the transition to the Late Cenozoic icehouse mode with the establishment of the east Antarctic ice sheet. However the precise role of continental weathering during this period of major climate change is poorly understood. Here we show changes in the rates of Miocene continental chemical weathering and physical erosion, which we tracked using the chemical index of alteration ( CIA) and mass accumulation rate ( MAR) respectively from Ocean Drilling Program (ODP) Site 1146 and 1148 in the South China Sea. We found significantly increased CIA values and terrigenous MARs during the MCO (ca. 17-15 Ma) compared to earlier and later periods suggests extreme continental weathering and erosion at that time. Similar high rates were revealed in the early-middle Miocene of Asia, the European Alps, and offshore Angola. This suggests that rapid sedimentation during the MCO was a global erosion event triggered by climate rather than regional tectonic activity. The close coherence of our records with high temperature, strong precipitation, increased burial of organic carbon and elevated atmospheric CO2 concentration during the MCO argues for long-term, close coupling between continental silicate weathering, erosion, climate and atmospheric CO2 during the Miocene. Citation: Wan, S., W. M. Kurschner, P. D. Clift, A. Li, and T. Li (2009), Extreme weathering/ erosion during the Miocene Climatic Optimum: Evidence from sediment record in the South China Sea, Geophys. Res. Lett., 36, L19706, doi: 10.1029/2009GL040279.
关键词Atmospheric Carbon-dioxide Late Cenozoic Uplift Himalayan Erosion 20 Ma Evolution Burial Rates Asia Vegetation Paleosols
学科领域Geosciences, Multidisciplinary
DOI10.1029/2009GL040279
收录类别SCI
语种英语
WOS记录号WOS:000270696200006
引用统计
被引频次:62[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.qdio.ac.cn/handle/337002/3700
专题海洋地质与环境重点实验室
作者单位1.Chinese Acad Sci, Inst Oceanol, Key Lab Marine Geol & Environm, Qingdao 266071, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, Beijing, Peoples R China
3.Univ Utrecht, Dept Palaeoecol, Inst Environm Biol, NL-3584 CD Utrecht, Netherlands
4.Univ Aberdeen, Sch Geosci, Kings Coll, Aberdeen AB24 3UE, Scotland
第一作者单位中国科学院海洋研究所
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Wan, Shiming,Kurschner, Wolfram M.,Clift, Peter D.,et al. Extreme weathering/erosion during the Miocene Climatic Optimum: Evidence from sediment record in the South China Sea[J]. GEOPHYSICAL RESEARCH LETTERS,2009,36:L19706.
APA Wan, Shiming,Kurschner, Wolfram M.,Clift, Peter D.,Li, Anchun,&Li, Tiegang.(2009).Extreme weathering/erosion during the Miocene Climatic Optimum: Evidence from sediment record in the South China Sea.GEOPHYSICAL RESEARCH LETTERS,36,L19706.
MLA Wan, Shiming,et al."Extreme weathering/erosion during the Miocene Climatic Optimum: Evidence from sediment record in the South China Sea".GEOPHYSICAL RESEARCH LETTERS 36(2009):L19706.
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