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学科主题: Geology
题名: Geochemistry of the sedimentary rocks from the Nanxiong Basin, South China and implications for provenance, paleoenvironment and paleoclimate at the K/T boundary
作者: Yan, Y ; Xia, B ; Lin, G ; Cui, XJ ; Hu, XQ ; Yan, P ; Zhang, FQ
通讯作者: yanyi@gig.ac.cn
关键词: South China ; Nanxiong Basin ; geochemistry ; provenance ; paleoclimate
刊名: SEDIMENTARY GEOLOGY
发表日期: 2007
卷: 197, 期:40545, 页:127-140
收录类别: sci
部门归属: Chinese Acad Sci, Key Lab Marginal Sea Geol, Guangzhou Inst Geochem, Guangzhou 510640, Peoples R China; Chinese Acad Sci, Key Lab Marginal Sea Geol, S China Sea Inst Oceanol, Guangzhou 510640, Peoples R China; Res Inst Petr Proc, Beijing 100083, Peoples R China
项目归属: 海洋地质
摘要: Cretaceous and Tertiary clastic sedimentary rocks from the Nanxiong Basin, South China have been analyzed to constrain their provenance, depositional climate and environment. Evidence from discrimination diagrams for sedimentary provenance and tectonic setting show that the Nanxiong Basin sediments were derived from typical continental sources. Geochemical signatures (e.g. Eu/Eu*, Th/Ti, La/Ti, Ta/Ti, Y-b/Ti and Y/Ti ratios of the claystone) are nearly constant, suggesting the provenance of the Nanxiong Basin remained similar throughout the Late Cretaceous to Early Paleocene (83-56 Ma). In contrast Rb/Ti, Cs/Ti ratios and TOC and CaCO3 concentrations require an obvious change in climate across the Late Cretaceous and Early Paleocene boundary. Singularly higher CaCO3 contents and lower TOC values and Rb/Ti, Cs/Ti ratios in the Late Cretaceous indicate that a long period extreme dry climate occurred at that time in South China. Rb/Ti, Cs/Ti ratios and TOC values escalated and CaCO3 contents decreased in the Early Paleocene suggesting that the climate became relatively wet, which resulted in greater vegetation cover. The lasting extreme dry climate in the Late Cretaceous may provide a clue to the extinction of the dinosaurs in the Nanxiong Basin. (C) 2006 Elsevier B.V. All rights reserved.
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WOS记录号: WOS:000246465900007
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4488
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Recommended Citation:
Yan, Y; Xia, B; Lin, G; Cui, XJ; Hu, XQ; Yan, P; Zhang, FQ.Geochemistry of the sedimentary rocks from the Nanxiong Basin, South China and implications for provenance, paleoenvironment and paleoclimate at the K/T boundary,SEDIMENTARY GEOLOGY,2007,197(40545):127-140
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