Variations in the radiolarian assemblages in the Bering Sea since Pliocene and their implications for paleoceanography

CORC > 南海海洋研究所 > 中国科学院南海海洋研究所 > 中科院边缘海地质重点实验室

	Variations in the radiolarian assemblages in the Bering Sea since Pliocene and their implications for paleoceanography
	Zhang, Q ; Chen, MH ; Zhang, LL ; Hu, WF ; Xiang, R
刊名	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
	2014
卷号	410 页码:337-350
关键词	The Bering Sea Site U1340 Pliocene Radiolarian assemblages Paleoenvironmental conditions
ISSN号	0031-0182
通讯作者	zhangqiang210@scsio.ac.cn ; mhchen@scsio.ac.cn ; llzhang@scsio.ac.cn ; su_dada@foxmail.com ; rxiang@scsio.ac.cn
中文摘要	Radiolarian assemblages were analyzed using samples from the IODP Site U1340 to reconstruct the paleoceanographic conditions in the Bering Sea Based on the characteristic faunal changes, the radiolarian evolution at Site U1340 was divided into four major intervals from Stages I to IV, with Stage IV divided into Substages IVa and IVb. The radiolarians in each stage recorded significant paleoenvironmental conditions. In general, the Bering Sea was governed by an ocean ecological environment with stable warm and saline surface water during Stage I (4.15 Myr to 3.91 Myr). The environment in the Bering Sea fluctuated strongly during Stage 11 (3.91 Myr to 2.75 Myr) and was controlled by the cold-water masses and sea ices during Stage III (2.75 Myr to 1.07 Myr) with the gradual development of cold and well-ventilated intermediate water. Stage IVa (1.07 Myr to 0.47 Myr) was a transitional period characterized by the enhanced formation of cold subsurface and intermediate water as well as of the oxygen-rich deep water. During Stage IVb (after 0.47 Myr), the Bering Sea was mainly characterized by enhanced warmth during interglacial episodes and well-developed water layers that were generally comparable to those of the modern Bering Sea. These conditions indicated that the vertical water-mass structure of the modern Bering Sea began to form since 0.47 Ma. Every Stage boundary in the studied core was marked by notable changes in the radiolarian assemblages. These changes corresponded to the climatic cooling event at similar to 3.91 Ma, the intensification of Northern Hemisphere glaciation at similar to 2.75 Ma, the beginning of the middle Pleistocene transition at similar to 1.07 Ma, and the low-latitude radiolarian ecology event at similar to 0.47 Ma. In addition, the relative abundance pattern of Cycladophora davisiana indicates that the Bering Sea was the main source of the past North Pacific Intermediate Water at ca. 0.85 Ma (MIS22), ca. 0.63 Ma (MIS16), and ca. 0.18 Ma (MIS6), just as it was during the last glacial maximum. (C) 2014 Elsevier B.V. All rights reserved.
学科主题	Physical Geography ; Geology ; Paleontology
收录类别	SCI
资助信息	National Natural Science Foundation of China [41076026, 41276051, 91228207]; National Key Basic Research Program of China [2013CB956102]; IODP-China
原文出处	ELSEVIER SCIENCE BV
WOS记录号	WOS:000340687700026
公开日期	2014-12-11
内容类型	期刊论文
源URL	[http://ir.scsio.ac.cn/handle/344004/10604]
专题	南海海洋研究所_中科院边缘海地质重点实验室
推荐引用方式 GB/T 7714	Zhang, Q,Chen, MH,Zhang, LL,et al. Variations in the radiolarian assemblages in the Bering Sea since Pliocene and their implications for paleoceanography[J]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2014,410:337-350.
APA	Zhang, Q,Chen, MH,Zhang, LL,Hu, WF,&Xiang, R.(2014).Variations in the radiolarian assemblages in the Bering Sea since Pliocene and their implications for paleoceanography.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,410,337-350.
MLA	Zhang, Q,et al."Variations in the radiolarian assemblages in the Bering Sea since Pliocene and their implications for paleoceanography".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 410(2014):337-350.