Benthic foraminiferal assemblages and bottom water evolution off the Portuguese margin since the Middle Pleistocene

doi:10.1016/j.gloplacha.2016.11.004

NIGPAS OpenIR

	Benthic foraminiferal assemblages and bottom water evolution off the Portuguese margin since the Middle Pleistocene
	Guo, Qimei 1,2; Li, Baohua 1; Kim, Jin-Kyoung 3
	2017-03-01
发表期刊	GLOBAL AND PLANETARY CHANGE
ISSN	0921-8181
卷号	150 页码:94-108
摘要	The upper 250 meter-long sediment core of Site U1391 (1085 m water depth) retrieved from the Portuguese margin in the Northeast Atlantic Ocean was adopted for the benthic foraminiferal analyses to disclose the variations in Mediterranean Outflow Water (MOW) intensity over the last similar to 0.9 Ma. Benthic foraminifera are abundant at this site and mainly composed of the hyaline forms (80%, such as Cibicidoides/Cibicides spp., Globobulimina spp., Bulimina spp., Uvigerina spp., Melonis spp., Sphaeroidina bulloides, Hoeglundina elegans, Gyroidinoides spp., Lenticulina spp. and Planulina ariminensis), while the agglutinated and porcelaneous forms have only 5% and 14.1% on average, respectively. Down-core variations of the benthic foraminifera show glacial-interglacial contrasts, especially those of Lenticulina spp. and Planulina ariminensis, which is also supported by the benthic foraminiferal cluster analysis. During the interglacial periods, the fauna are dominated by Sphaeroidina bulloides, Lenticulina spp., Planulina ariminensis, Dentalina spp., Cibicidoides robertsonianus and the agglutinated forms, while by Cibicidoides pachyderma, Praeglobobulimina ovata, Praeglobobulimina pupoides, Bulimina mexicana, Uvigerina mediterranea, Bolivinita quadrilatera and mililoids during the glacial periods. Benthic foraminiferal faunal data at Site U1391 was detailed analyzed to disclose the bottom water property over the last similar to 0.9 Ma. Variations of the character species or assemblages, such as Planulina ariminensis, and the "elevated epibenthos" group suggest that the MOW intensity has typical glacial-interglacial cycles, strengthening during the interglacial periods and weakening during the glacial periods, and reaches its peak at MIS 11. The strongest MOW intensity during MIS 11 confirms the climatic influence of waving sea level on the MOW current by its +20 m high-stand above the present sea level. The agglutinated benthic foraminifera have a significantly positive correlation with the MOW index of "elevated epibenthos", which suggests that their abundance can be used to monitor the hydrodynamic conditions of bottom water off the Portuguese margin. Consistent with the MOW intensity, the lower miliolids content implies a lower salinity which supported the stronger vertical density gradient during the interglacial periods in this region; while the glacial ocean has a higher salinity with a weak vertical density gradient/MOW intensity. (C) 2016 Elsevier B.V. All rights reserved.
关键词	Benthic foraminifera Portuguese margin Mediterranean outflow water Middle-Late Pleistocene
DOI	10.1016/j.gloplacha.2016.11.004
语种	英语
关键词[WOS]	MEDITERRANEAN OUTFLOW WATER ; CONTINENTAL-MARGIN ; NORTH-ATLANTIC ; COMMUNITY STRUCTURE ; SEA-LEVEL ; OCEAN ; GULF ; CADIZ ; CIRCULATION ; GIBRALTAR
资助项目	National Natural Science Foundation of China[41276044] ; CAS Strategic Priority Project[XDA11030104] ; IODP-China
WOS研究方向	Physical Geography ; Geology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary
WOS记录号	WOS:000397370100007
项目资助者	National Natural Science Foundation of China ; CAS Strategic Priority Project ; IODP-China
出版者	ELSEVIER SCIENCE BV
文献类型	期刊论文
条目标识符	http://ir.nigpas.ac.cn/handle/332004/20527
通讯作者	Li, Baohua
作者单位	1.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Nanjing 210008, Jiangsu, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Korean Inst Ocean Sci & Technol, Ansan 426744, South Korea 4.Texas A&M Univ, IODP, College Stn, TX USA
推荐引用方式 GB/T 7714	Guo, Qimei,Li, Baohua,Kim, Jin-Kyoung. Benthic foraminiferal assemblages and bottom water evolution off the Portuguese margin since the Middle Pleistocene[J]. GLOBAL AND PLANETARY CHANGE,2017,150:94-108.
APA	Guo, Qimei,Li, Baohua,&Kim, Jin-Kyoung.(2017).Benthic foraminiferal assemblages and bottom water evolution off the Portuguese margin since the Middle Pleistocene.GLOBAL AND PLANETARY CHANGE,150,94-108.
MLA	Guo, Qimei,et al."Benthic foraminiferal assemblages and bottom water evolution off the Portuguese margin since the Middle Pleistocene".GLOBAL AND PLANETARY CHANGE 150(2017):94-108.