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Geochemistry of the sedimentary rocks from the Nanxiong Basin, South China and implications for provenance, paleoenvironment and paleoclimate at the K/T boundary
Yan, Y; Xia, B; Lin, G; Cui, XJ; Hu, XQ; Yan, P; Zhang, FQ; yanyi@gig.ac.cn
2007
Source PublicationSEDIMENTARY GEOLOGY
ISSN0037-0738
Volume197Issue:40545Pages:127-140
AbstractCretaceous 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.
DepartmentChinese 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
KeywordSouth China Nanxiong Basin Geochemistry Provenance Paleoclimate
Subject AreaGeology
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Indexed Bysci
Funding Project海洋地质
WOS IDWOS:000246465900007
Citation statistics
Document Type期刊论文
Identifierhttp://ir.scsio.ac.cn/handle/344004/4488
Collection中科院边缘海地质重点实验室
Corresponding Authoryanyi@gig.ac.cn
Recommended Citation
GB/T 7714
Yan, Y,Xia, B,Lin, G,et al. Geochemistry of the sedimentary rocks from the Nanxiong Basin, South China and implications for provenance, paleoenvironment and paleoclimate at the K/T boundary[J]. SEDIMENTARY GEOLOGY,2007,197(40545):127-140.
APA Yan, Y.,Xia, B.,Lin, G.,Cui, XJ.,Hu, XQ.,...&yanyi@gig.ac.cn.(2007).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,197(40545),127-140.
MLA Yan, Y,et al."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 197.40545(2007):127-140.
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