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Title: A preliminary study of a sediment core drilled from the mud area on the inner shelf of the East China Sea: implications for paleoclimatic changes during the fast transgression period (13 ka BP-8 ka BP)
Authors: ShengfaLiu;BeibeiMi;XishengFang;XiaoyanLi;Hui-JuanPan;Min-TeChen;XuefaShi
Contributors: 國立臺灣海洋大學:應用地球科學研究所
Keywords: East China Sea;Provenance;Transgression;Mud deposit;Late Pleistocene;Paleoclimate
Date: 2017-06
Issue Date: 2018-03-16T06:28:48Z
Publisher: Quaternary International
Abstract: Abstract:A 35.30 m-long core (MZ02) that was recovered from a water depth of 32.4 m from the inner shelf mud deposit of the East China Sea is analyzed to determine its sedimentary characteristics, color reflectance, clay mineral content, element geochemistry components and AMS 14C dating to investigate the sedimentation rate, sediment provenance and paleoclimate evolution during the fast transgression period. Rare earth element and clay mineral proxies indicate that mixed-provenance sediment accumulated in the foreshore–nearshore region at the beginning of the fast transgression period, with a higher sedimentation rate of 5.58 m/ka. From the early Holocene (9.8–9.5 ka B.P.), the sedimentation rate declined by approximately 1.73 m/ka, and the sediment provenance obviously changed. The silt fraction resembled that of Taiwan's mountainous rivers and the clay fraction was primarily transported from the Yangtze River. A multiple proxy system including sediment redness (a*), chemical index of alteration (CIA), clay mineral ratio (smectite/kaolinite), and major and trace element ratios (CaO/MgO, Ba/Sr), also provides a good paleoclimate record during the fast transgression period, which can be divided into three units. All the proxies barely changed during Unit I (12.88–10.85 ka B.P.), revealing that the climate remained relatively stable. Obvious fluctuations occurred during Unit II (10.85–10.05 ka B.P.), and the temperature kept decreasing for more than 1 ka until the Younger Dryas event, showing a notable regional response to global climate changes. A continuous warming trend resumed again during Unit III (10.05–8.15 ka B.P.), which may mark the threshold of the Holocene warm period. In addition, we find significant 80-yr, 89-yr and 100-yr cycles in the CIA, CaO/MgO and Ba/Sr records, which imply the possible influence of solar activity on regional climate change during the fast transgression period in the Asian margin region.
Relation: 441 pp.35-50
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/45394
Appears in Collections:[應用地球科學研究所] 期刊論文

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