Deepwater redox changes in the southern Okinawa Trough since the last glacial maximum

doi:10.1016/j.pocean.2015.04.007

	Deepwater redox changes in the southern Okinawa Trough since the last glacial maximum
	Dou, Yanguang 1; Yang, Shouye 2; Li, Chao 2; Shi, Xuefa 3; Liu, Jihua 3; Bi, Lei 2
刊名	PROGRESS IN OCEANOGRAPHY
	2015-06
卷号	135 页码:77-90
ISSN号	0079-6611
DOI	10.1016/j.pocean.2015.04.007
英文摘要	In this study, rare earth element (REE) was treated as a paleo-redox proxy to investigate the changes of depositional environment in the southern Okinawa Trough since the last glacial maximum. The acid-leachable fraction (leachate) of the sediments recovered from the ODP Site 1202B is dominated by biogenic and authigenic components while detrital contamination is minor. The significant enrichment of middle REE suggests a large contribution from authigenic Mn oxyhydroxides and cerium (Ce) anomaly can indicate deepwater redox change. The REE parameters including Ce anomaly in the leachate exhibit remarkable and abrupt changes in the early Holocene (similar to 9.5 ka) and during LGM (similar to 20 ka). An increase of Ce anomaly at 28-22 ka implies the suboxic deepwater condition probably caused by increased primary productivity. Weak positive Ce anomalies during the last glacial maximum and deglaciation suggest an oxic depositional environment responding to the enhanced deepwater ventilation with the advection of the North Pacific Intermediate Water and/or South China Sea Intermediate Water into the trough. A decrease of Ce anomaly in the early Holocene might be caused by the intrusion and strengthening of the Kuroshio Current in the trough that enhanced the water stratification and induced a gradual development of suboxic depositional condition. Furthermore, an abrupt change of chemical composition at ca. 4 ka probably indicates a decrease of dissolved oxygen in deepwater and a weakening of ventilation in the Okinawa Trough. This study suggests that REE proxy can provide new insights into the linkage among surface current, deepwater circulation and sediment record in the continental margin where terrigenous input dominates. (C) 2015 Elsevier Ltd. All rights reserved.
资助项目	Key Laboratory of Marine Sedimentology & Environmental Geology, State Ocean Administration[MASEG201202]
WOS关键词	RARE-EARTH-ELEMENTS ; EAST CHINA SEA ; PACIFIC INTERMEDIATE WATER ; DILUTE HYDROCHLORIC-ACID ; NORTH PACIFIC ; MARINE-SEDIMENTS ; INDIAN-OCEAN ; FERROMANGANESE NODULES ; NORTHWESTERN PACIFIC ; PELAGIC SEDIMENTS
WOS研究方向	Oceanography
语种	英语
出版者	PERGAMON-ELSEVIER SCIENCE LTD
WOS记录号	WOS:000356552100006
内容类型	期刊论文
源URL	[http://ir.fio.com.cn:8080/handle/2SI8HI0U/25704]
专题	自然资源部第一海洋研究所
通讯作者	Yang, Shouye
作者单位	1.Qingdao Inst Marine Geol, Minist Land & Resources, Key Lab Marine Hydrocarbon Resources & Environm G, Qingdao 266071, Peoples R China 2.Tongji Univ, State Key Lab Marine Geol, Shanghai 200092, Peoples R China 3.SOA, Inst Oceanog 1, Key Lab Marine Sedimentol & Environm Geol, Qingdao 266071, Peoples R China
推荐引用方式 GB/T 7714	Dou, Yanguang,Yang, Shouye,Li, Chao,et al. Deepwater redox changes in the southern Okinawa Trough since the last glacial maximum[J]. PROGRESS IN OCEANOGRAPHY,2015,135:77-90.
APA	Dou, Yanguang,Yang, Shouye,Li, Chao,Shi, Xuefa,Liu, Jihua,&Bi, Lei.(2015).Deepwater redox changes in the southern Okinawa Trough since the last glacial maximum.PROGRESS IN OCEANOGRAPHY,135,77-90.
MLA	Dou, Yanguang,et al."Deepwater redox changes in the southern Okinawa Trough since the last glacial maximum".PROGRESS IN OCEANOGRAPHY 135(2015):77-90.