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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/24693

Title: Authigenic Uranium in Marine Sediments of the Benguela Current Upwelling Region During the Last Glacial Period
Authors: Ein-Fen Yu;Chih-Hung Liang;Min-Te Chen
Contributors: NTOU:Institute of Applied Geosciences
Keywords: Authigenic Uranium;Last Glacial Stage;Benguela Current Upwelling
Date: 1999-03-01
Issue Date: 2011-10-20T08:17:24Z
Publisher: Terrestrial, Atmospheric and Oceanic Sciences
Abstract: abstract:Ultrahigh resolution records of carbonate and organic carbon concentrationsfrom core MD972148(19°47.804'N 117°32.56'E;water depth 2830m)provide information on glacial-interglacial as well as millennial to centennial scale variability in the production of biogenic sediments in the northern slope of the South China Sea(SCS)over the past 150,000 years.Apreliminary age model of this record is estimated using a biostratigraphicdatum of Globigerinoides ruber(pink)and the relationship of carbonateconcentrations and (The equation is abbreviated)^(18)O of planktonic foraminifers shown in previous SCSrecords.The downcore patterns in this record show that the carbonateconcentration maxima correspond to interglacial times and minima correspondto glacials,indicating effects of dilution of terrengious clastic sediments from nearby continents.Exposure of extensive continental shelf andrelatively dry climate during glacial periods are responsible for the enhancedinput of terrengious components into the SCS.Two long-term trends inwhich the organic carbon content was increased steadily from stage 5 tostage 2 and from the late stage 7 to stage 6 are clearly observed.Highorganic carbon concentrations seem to occur during the transition frommajor glacial to interglacial stages and are probably controlled by effectsof preservation or rates of sedimentation,or biological productivity.Wehave also observed significant components of high-frequency variability inthe carbonate and organic carbon concentration records.These rapid concentration changes can be attributed possibly to highly-unstable climaticconditions in the SCS during the late Quaternary.
Relation: 10(1), pp.201-214
URI: http://ntour.ntou.edu.tw/handle/987654321/24693
Appears in Collections:[應用地球科學研究所] 期刊論文

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