DOI: 10.1016/j.palaeo.2014.06.032
论文题名: The "Northern guests" and other palaeoclimatic ostracod proxies in the late Quaternary of the Basque basin (S Bay of Biscay)
作者: Martínez-García B. ; Rodríguez-Lázaro J. ; Pascual A. ; Mendicoa J.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 419, 期: 1 起始页码: 100
结束页码: 114
语种: 英语
英文关键词: "Northern guests"
; Basque shelf
; Bay of Biscay
; Late Quaternary
; Ostracod assemblages
; Water masses
英文摘要: The analysis of the ostracod assemblages from three cores obtained from the middle and outer shelves of the Basque Basin, allows us to evidence the influence of different water masses on the Basque shelf during late Quaternary (MIS 3 - the present). During pre-Holocene, the dominance of Krithe spp. and Cytherella lata marks the input of cold (b5 °C) waters coming from deeper areas of the southern Bay of Biscay. During the Holocene, in thewestern outer Basque shelf the dominance of Costa edwardsii and Palmoconcha guttata evidences the presence ofwarmwaters (11-17 °C). However, the abundance of Krithe spp., C. lata and Cytherella alvearium in the eastern outer shelf shows the input of colderwaters by upwelling currents fromdeeper areas of the southern Bay of Biscay and their restricted influence to the eastern margin. In the middle shelf, despite the affectation ofwarmwaters (dominance of C. edwardsii) during the earlyHolocene (c. 8.8-6.8 ka cal BP), the values of δ18Obull, Neogloboquadrina pachyderma sin. and "Northern guests" Acanthocythereis dunelmensis and "Trachyleberis" sp. percentages point to the entrance of colder polar surface and bottom waters during the mid-Holocene (c. 6.8-4.3 ka cal BP), which came from the west of the study area as upwelling currents. During the late Holocene (c. 4.3 ka cal BP to the present) these circumpolar waters retreated fromthe middle shelf and the bottomwaters suffered a relativewarming. Besides, some "cold" climatic events, such as Heinrich event HE 3 (c. 31.3 ka cal BP), have been characterized in the Basque shelf by the presence of "Northern guests" A. dunelmensis, Cytheropteron testudo and "Trachyleberis" sp., which defines the occasional input of cold (0-8 °C) bottom waters coming from the circumpolar area of the North Atlantic Ocean into the Basque shelf during late Quaternary. © 2014 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69126
Appears in Collections: 过去全球变化的重建
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作者单位: Universidad del País Vasco UPV/EHU, Facultad de Ciencia y Tecnología, Dpto. Estratigrafía y Paleontología, B. Sarriena s/n, Apartado 644, Bilbao, Spain
Recommended Citation:
Martínez-García B.,Rodríguez-Lázaro J.,Pascual A.,et al. The "Northern guests" and other palaeoclimatic ostracod proxies in the late Quaternary of the Basque basin (S Bay of Biscay)[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,419(1)