| 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
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| 2009-10-06 | |
| 发表期刊 | GEOPHYSICAL RESEARCH LETTERS
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| ISSN | 0094-8276 |
| 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 |
| DOI | 10.1029/2009GL040279 |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000270696200006 |
| 引用统计 | |
| 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 |
| 推荐引用方式 GB/T 7714 | 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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