气候变化领域集成服务门户(CCPortal): Paleoclimatic evolution of the SW and NE South China Sea and its relationship with spectral reflectance data over various age scales

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DOI	10.1016/j.palaeo.2019.02.019
	Paleoclimatic evolution of the SW and NE South China Sea and its relationship with spectral reflectance data over various age scales
	Liu C.; Clift P.D.; Giosan L.; Miao Y.; Warny S.; Wan S.
发表日期	2019
ISSN	0031-0182
起始页码	25
结束页码	43
卷号	525
英文摘要	Spectral analysis of sediment from International Ocean Discovery Program (IODP) Site U1433 in the South China Sea can be used to constrain humidity and temperature through time by constructing hematite/goethite records spanning the last 10 million years. Records in the southwest and northern parts of this basin show long-term contrasting trends, despite the fact that geochemical evidence for alteration is similar in both parts of the basin, i.e. towards less alteration since 10 Ma. However, contrasting clay mineral assemblages in the northern and southwestern areas do suggest long-term changes in the relative climate of Indochina and southern China. We interpret this to reflect the northward migration of the ITCZ since the Miocene resulting in a progressive drying of Indochina and increasingly wet conditions in South China. Sediment believed to be supplied from the Mekong River (IODP Site U1433) shows increasing chemical weathering at a time of long-term drying of the climate. This probably reflects increasing chemical weathering driven by slower transport and despite reduced rates of chemical alteration in the context of a colder, drier climate since the Miocene. In general hematite/goethite data are consistent with pollen constraints from the same drill site that show colder conditions with increasing hematite/goethite since 3 Ma and with a transition to apparently wetter conditions since the mid-Pleistocene transition (MPT). This implies that most of the sediment in the southwestern basin is weathered and eroded during warmer, wetter interglacial phases, at least since the MPT. © 2019 Elsevier B.V.
英文关键词	Bulk geochemistry; Chemical weathering; Clay mineralogy; Hematite/Goethite; Intertropical convergence zone (ITCZ); IODP Exp. 349
语种	英语
scopus关键词	air temperature; chemical alteration; chemical weathering; clay mineral; geochemistry; goethite; hematite; historical record; humidity; interglacial; intertropical convergence zone; long-term change; marine sediment; Miocene; paleoclimate; Pleistocene; pollen; scale effect; spectral reflectance; Indochina; Mekong River; Pacific Ocean; South China Sea
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150962
作者单位	International Ocean Discovery Program, Texas A&M University, College Station, TX 77845, United States; Department of Geology and Geophysics, Louisiana State University, Baton Rouge, 70803, United States; Research Center for Earth System Science, Yunnan University, Chenggong District, Kunming, Yunnan, China; Department of Geology and Geophysics, Woods Hole Oceanographic Institution, Woods Hole, MA 02540, United States; Key Laboratory of Desert and Desertification, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou, 730000, China; Key Laboratory of Marine Geology and Environment, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China
推荐引用方式 GB/T 7714	Liu C.,Clift P.D.,Giosan L.,et al. Paleoclimatic evolution of the SW and NE South China Sea and its relationship with spectral reflectance data over various age scales[J],2019,525.
APA	Liu C.,Clift P.D.,Giosan L.,Miao Y.,Warny S.,&Wan S..(2019).Paleoclimatic evolution of the SW and NE South China Sea and its relationship with spectral reflectance data over various age scales.Palaeogeography, Palaeoclimatology, Palaeoecology,525.
MLA	Liu C.,et al."Paleoclimatic evolution of the SW and NE South China Sea and its relationship with spectral reflectance data over various age scales".Palaeogeography, Palaeoclimatology, Palaeoecology 525(2019).