Glacio-eustatic variations and sapropel events as main controls on the Middle Pleistocene-Holocene evolution of the Cabliers Coral Mound Province (W Mediterranean)

QUATERNARY SCIENCE REVIEWS

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Article

Corbera, Guillem^1,2  Lo Iacono, Claudio³  Standish, Christopher D.²  Anagnostou, Eleni⁴  Titschack, Jurgen^5,6  Katsamenis, Orestis⁷  Cacho, Isabel⁸  Van Rooij, David⁹  Huvenne, Veerle A., I¹  Foster, Gavin L.² 

[1] Natl Oceanog Ctr, Southampton, Hants, England

[2] Univ Southampton, Natl Oceanog Ctr Southampton, Sch Ocean & Earth Sci, Southampton SO14 3ZH, Hants, England

[3] Inst Ciencies Mar CSIC, Barcelona 08003, Spain

[4] GEOMAR Helmholtz Ctr Ocean Res, Kiel, Germany

[5] Univ Bremen, MARUM Ctr Marine Environm Sci, Bremen, Germany

[6] Senckenberg Meer, Marine Res Dept, D-26382 Wilhelmshaven, Germany

[7] Univ Southampton, Fac Engn & Environm, M Vis Xray Imaging Ctr, Southampton SO17 1BJ, Hants, England

[8] Univ Barcelona, Barcelona, Spain

[9] Univ Ghent, Dept Geol, Ghent, Belgium

关键词: Cold-water corals;    Coral mounds;    Paleoclimate;    Sapropels;    Water mass interface;    Alboran sea;    Pleistocene;    Holocene;   

DOI  :  10.1016/j.quascirev.2020.106783

来源: Elsevier

【 摘 要 】

Cold-water coral mounds are key hot-spots of deep ocean biodiversity and also important archives of past climatic conditions. Nonetheless, the paleo-oceanographic setting in which coral mounds developed in the Mediterranean Sea during the last 500 ka still needs to be properly understood. This study describes the coral deposits and corresponding ages of two on-mound gravity cores acquired from opposite sectors of the newly discovered Cabliers Coral Mound Province (CMP, Alboran Sea, W Mediterranean). U-Th data revealed Pleistocene-aged corals covering mound formation periods from >389 to 9.3 ka BP and from 13.7 to 0.3 ka BP in the southern and northern mounds respectively. The coral-rich deposits of the cores were mainly dominated by Desmophyllum pertusum, although in some sections concurrent with the Middle Pleistocene and the Holocene, other corals such as Dendrophyllia cornigera and Madrepora oculata also appeared as dominating species. Coral mound formation stages generally occurred during deglacials and temperate interstadial (3.5-4.1 delta O-18 parts per thousand) periods, whereas during interglacials (<3.5 delta O-18 parts per thousand) coral mound formation only occurred in the northern and shallower mound. We interpret this to indicate that the shoaling of the interface between Atlantic (AW) and Levantine Intermediate Waters (LIW) during interglacial periods prevented the corals in the southern CMP from acquiring sufficient food supply, thus causing periods of coral mound stagnation. Similarly, the interruption in LIW formation throughout sapropel events also coincides with coral mound stagnation phases. This suggests that sapropel-derived processes, which originated in the eastern Mediterranean, likely affected the entire Mediterranean basin and further supports the role of LIW as a conveyor belt facilitating cold-water coral growth in the Mediterranean Sea. Overall, we show that these coral mounds yield important insights into how local changes in oceanographic conditions can influence coral mound development. (C) 2020 Elsevier Ltd. All rights reserved.

【 授权许可】

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