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Controls on modern erosion and the development of the Pearl River drainage fa in the late Paleogene
Liu, C; Clift, PD; Carter, A; Boning, P; Hu, ZC; Sun, Z; Pahnke, K;
摘要The Pearl River and its tributaries drains large areas of southern China and has been the primary source of sediment to the northern continental margin of the South China Sea since its opening. In this study we use a combination of bulk sediment geochemistry, Nd and Sr isotope geochemistry, and single grain zircon U-Pb dating to understand the source of sediment in the modern drainage. We also performed zircon U-Pb dating on Eocene sedimentary rocks sampled by International Ocean Discovery Program (IODP) Expedition 349 in order to constrain the source of sediment to the rift before the Oligocene. A combination of Nd and Sr isotopes shows that the Gui, Liu and Dong Rivers are likely not important sources. Single grain zircon dates emphasize the importance of the westernmost tributaries (Hongshui and Yu Rivers), which drain the highest topography and tectonically active areas, as the primary sediment producers. Our data indicate that climate is not the primary control on erosion patterns and intensities. Zircon dating also shows that the Gui and Liu Rivers are not generating large sediment yields. Discrepancies between these new data and earlier samples make the role of the Dong River hard to determine, although Nd isotopes suggest that it is not dominant. The source of sediment during the Eocene at IODP Site U1435 appears to have been a relatively local basement source, or a regionally restricted river only draining nearby areas of the Cathaysia Block, similar, but not identical, to the modern Dong River. There is no evidence for a large regional river and we exclude sediment transport from the southwest (Indochina). Our data are consistent with small drainage systems dominating the basin until the end of the Oligocene (similar to 24 Ma), after which the Pearl River expanded towards its modern state as a result of headwater capture largely towards the west.
部门归属[Liu, Chang; Clift, Peter D.] Louisiana State Univ, Dept Geol & Geophys, Baton Rouge, LA 70803 USA; [Clift, Peter D.] Nanjing Normal Univ, Sch Geog Sci, Nanjing 210023, Jiangsu, Peoples R China; [Carter, Andrew] Univ London, Birkbeck Coll, Dept Earth & Planetary Sci, London WC1E 7HX, England; [Boening, Philipp; Pahnke, Katharina] Carl von Ossietzky Univ Oldenburg, Inst Chem & Biol Marine Environm ICBM, Max Planck Res Grp Marine Isotope Geochem, D-26129 Oldenburg, Germany; [Hu, Zhaochu] China Univ Geosci, State Key Lab Geol Proc & Mineral Resources, Wuhan 430074, Hubei, Peoples R China; [Sun, Zhen] Chinese Acad Sci, South China Sea Inst Oceanol, Key Lab Marginal Sea Geol, 164 Xingangxi Rd, Guangzhou 510301, Guangdong, Peoples R China
学科领域Geology ; Oceanography
关键词[WOS]Zircon ; Nd isotope ; Erosion ; Provenance ; Pearl River ; South China Sea ; International Ocean discovery program ; IODP site U1435
GB/T 7714
Liu, C,Clift, PD,Carter, A,et al. Controls on modern erosion and the development of the Pearl River drainage fa in the late Paleogene[J]. MARINE GEOLOGY,2018,394:52-68.
APA Liu, C.,Clift, PD.,Carter, A.,Boning, P.,Hu, ZC.,...& on modern erosion and the development of the Pearl River drainage fa in the late Paleogene.MARINE GEOLOGY,394,52-68.
MLA Liu, C,et al."Controls on modern erosion and the development of the Pearl River drainage fa in the late Paleogene".MARINE GEOLOGY 394(2018):52-68.
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