DOI: 10.1016/j.palaeo.2015.09.012
论文题名: Surface-water conditions in the Mediterranean Basin during earliest Pliocene as revealed by calcareous nannofossil assemblages: Comparison between western and eastern sectors
作者: Di Stefano A. ; Baldassini N. ; Alberico I.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2015
卷: 440 起始页码: 283
结束页码: 296
语种: 英语
英文关键词: Calcareous nannofossils
; Mediterranean Sea
; ODP sites 975B and 969B
; Principal Component Analysis (PCA)
; Surface-water conditions
; Zanclean (early Pliocene)
英文摘要: The abundant and diverse calcareous nannofossil assemblages found in the sediments of two ODP cores from the Western (Site 975B, South Balearic Basin) and Eastern (Site 969B, Mediterranean Ridge) Mediterranean Sea have been taken into account for the paleoenvironmental reconstruction of the surface water conditions during the first 490 kyrs immediately following the end of the Messinian Salinity Crisis, chronostratigraphically settled at 5.332 Ma. The areal distribution of the calcareous nannofossils is closely linked to their ecological and environmental affinities, mostly driven by temperature, salinity, nutrients or other chemical parameters of the water masses. Hence, taxa (or groups of taxa) showing well-known ecological behaviors were considered, and different environmental evolutions were recognized for the two sectors of the Mediterranean Basin during the early Zanclean (early Pliocene). Specifically, in the Western Mediterranean a switching from a warm and oligotrophic water environment, showing normal open-marine conditions, to a colder and eutrophic one, characterized by a decrease in salinity rates and the development of a more restricted environment, can be recorded. Conversely, in the Eastern Mediterranean the environmental setting immediately following the MSC is indicative of temperate waters and normal open-marine conditions, which evolves, in the younger layers, to a warmer environment characterized by high salinity rates and typical of a restricted marine context. The timing of the environmental transitions recognized at the two sites has been set through the Principal Component Analysis. Taxa and groups of taxa reflecting precise ecological affinities have been handled together and a transition interval have been defined between 5.20/5.15 Ma and 5.06/4.98 Ma, and between 5.10 Ma and 4.92 Ma in the Western and Eastern Mediterranean, respectively. © 2015 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68767
Appears in Collections: 过去全球变化的重建
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作者单位: Università di Catania, Dipartimento di Scienze Biologiche, Geologiche e Ambientali, Corso Italia 57, Catania, Italy; Consiglio Nazionale delle Ricerche, Istituto per l'Ambiente Marino Costiero, Calata Porto di Massa, Interno Porto di Napoli, Napoli, Italy
Recommended Citation:
Di Stefano A.,Baldassini N.,Alberico I.. Surface-water conditions in the Mediterranean Basin during earliest Pliocene as revealed by calcareous nannofossil assemblages: Comparison between western and eastern sectors[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2015-01-01,440