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学科主题: Paleontology
题名: Paleoenvironmental changes during the last 8400 years in the southern Yellow Sea: Benthic foraminiferal and stable isotopic evidence
作者: Xiang, R ; Yang, Z ; Saito, Y ; Fan, D ; Chen, MH ; Guo, Z ; Chen, Z
通讯作者: rxiang@scsio.ac.cn
关键词: benthic foraminifera ; oxygen isotope ; carbon isotope ; grain-size ; holocene ; paleoenvironment ; Yellow Sea ; salinity
刊名: MARINE MICROPALEONTOLOGY
发表日期: 2008
卷: 67, 期:40545, 页:104-119
收录类别: sci
部门归属: [Xiang, Rong; Chen, Muhong; Chen, Zhong] Chinese Acad Sci, S China Sea Inst Oceanol, CAS Key Lab Marginal Sea Geol, Guangzhou 510301, Peoples R China; [Yang, Zuosheng; Fan, Dejiang; Guo, Zhigang] China Ocean Univ, Coll Geosci, Qingdao 266003, Peoples R China; [Saito, Yoshiki] Geol Survey Japan, Tsukuba, Ibaraki 3058567, Japan
项目归属: 海洋地质
摘要: We used benthic foraminiferal, stable isotopic and grain-size data from an AMS C-14 dated core from the southern Yellow Sea to decipher Holocene paleoenvironmental changes. Large-amplitude changes in 6180, 613 C and benthic foraminiferal assemblage composition indicate that major environmental changes occurred during the last 8400 years in the southern Yellow Sea. We recognize 3 stages of environmental development: 1. A low salinity estuarine environment stage, at 8.4-6.9 cal. kyr BP, 2. A low salinity shallow sea environment stage at 6.9 to about 6-5 cal. kyr BP and 3. A modem marine shelf environment stage after about 6-5 cal. kyr BP The delta O-18 and delta C-13 values of Ammonia aomoriensis (Asano), combined with benthic foraminiferal assemblage data indicate a low bottom-water salinity (< 15 parts per thousand) during stage 1, suggesting a large amount of river runoff. Abrupt increases in delta O-18 and delta C-13 around 6.9 cal. kyr BP were accompanied by a decrease in mean grain-size and in abundance of benthic foraminifera, possibly caused by a North-ward shift of the Yellow River's outlet. During subsequent stage 2 the southern Yellow Sea was still characterized by a low salinity (<28 parts per thousand) even though sea-level was high, possibly due to the continued strong influence of river input, and/or limited exchange between the southern Yellow Sea and the open ocean. At about 6-5 cal. kyr BP, an A. aomoriensis dominated benthic foraminiferal assemblage was replaced by an Ammonia ketienziensis (Ishizaki) dominated assemblage, indicating an increase in bottom-water salinity. Grain-size and stable isotope data, suggest that the modem circulation was probably established at that time. We speculate that the combined impacts of reduced river runoff, enhanced East Asia Winter Monsoon, and increased influence of southern, warm ocean currents caused this transition. (C) 2007 Elsevier B.V. All rights reserved.
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WOS记录号: WOS:000255237100006
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内容类型: 期刊论文
URI标识: http://ir.scsio.ac.cn/handle/344004/4560
Appears in Collections:中科院边缘海地质重点实验室_期刊论文

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Recommended Citation:
Xiang, R; Yang, Z; Saito, Y; Fan, D; Chen, MH; Guo, Z; Chen, Z.Paleoenvironmental changes during the last 8400 years in the southern Yellow Sea: Benthic foraminiferal and stable isotopic evidence,MARINE MICROPALEONTOLOGY,2008,67(40545):104-119
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