| 南海渐新世以来粘土矿物的演变特征及意义 |
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| 引用本文： | 唐松,邵磊,赵泉鸿.南海渐新世以来粘土矿物的演变特征及意义[J].沉积学报,2004,22(2):337-342. |
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| 作者姓名： | 唐松 邵磊 赵泉鸿 |
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| 作者单位： | 同济大学海洋地质教育部重点实验室 上海 200092 |
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| 基金项目： | 国家自然科学基金
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国家重点基础研究发展计划(973计划) |
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| 摘 要： | 通过对南海北部ODP184航次1148站32.8Ma以来深海沉积物中粘土矿物组成及其变化特征的分析,发现以15.5Ma为界,下部沉积物粘土矿物组成中蒙脱石含量高达70%,上部则以伊利石和绿泥石逐步增高、蒙脱石含量明显下降为特征,揭示出该区深海沉积物中粘土矿物演变可以分为32.8～15.5Ma的构造控制期和15.5Ma以来的气候控制期。在构造控制期,粘土矿物成分记录了南海扩张演变的历史;而在气候控制期,粘土矿物特征除反映出南海北部周边总体降温的过程外,还显示了3Ma的突然降温,与该站底栖有孔虫氧同位素资料反映的全球气候变化具有很好的对比性。
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| 关 键 词： | 南海 粘土矿物 构造 气候变化 ODP1148 |
| 文章编号： | 1000-0550(2004)02-0337-06 |
| 收稿时间： | 2003-05-28 |
| 修稿时间： | 2003年5月28日 |
Characteristics of Clay Mineral in South China Sea since Oligocene and Its Significance |
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| TANG Song,SHAO Lei,ZHAO Quan-hong.Characteristics of Clay Mineral in South China Sea since Oligocene and Its Significance[J].Acta Sedimentologica Sinica,2004,22(2):337-342. |
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| Authors: | TANG Song SHAO Lei ZHAO Quan-hong |
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| Institution: | Key Laboratory of Marine Geology, Ministy of Education,Tongji University, Shanghai 200092 |
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| Abstract: | The distribution of clay mineral in the sediments of ODP Leg 184 Site 1148, located on the north slope of the South China Sea and recovered 32.8Ma sediments,shows different character between 32.8-15.5 Ma and since 15.5-0Ma periods. In 32.8-15.5 Ma the sediments are dominated by smectite,whose relative abundance is as high as 70 percent,while the abundance of illite and chlorite increase gradually with the decrease of smectite into the last 15.5 Ma. Thus, the evolution of clay mineral in the sediments can be divided into two stages. 32.8-15.5 Ma is tectonic-controlled stage,in which the clay mineral record the speading history of South China Sea.Whereas the climate controlled the distribution of clay mineral since last 15.5 Ma.In this climate-controlled stage the distribution of clay mineral indicated that the temperature decreased gradually and droped rapidly at 3Ma.This result is well consistent with that of δ18O of benthic foraminifera. |
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| Keywords: | South China Sea clay mineral tectonic activity climate change ODP 1148 |
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