期刊
QUATERNARY SCIENCE REVIEWS
卷 228, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.quascirev.2019.106075
关键词
Micropaleontology; Foraminifers; Ichnology; Stable isotopes; Organic matter flux; Thermohaline circulation; Paleoceanography; Organic Rich Layer (ORL); Western Mediterranean; Late glacial; Holocene
资金
- European Research Council [ERC-CoG-2015, 683237]
- Ministerio de Economia y Competitividad of Spain [CTM2016-75411-R, CGL2015-66835-P, RTI2018-099489-B-I00]
- Research Group GRC Geociencies Marines [2017 SGR 315]
- Generalitat de Catalunya
- Research Groups [RNM-178, RNM-190]
- Postdoctoral fellowship Beatriu de Pinos - AGAUR from the Generalitat de Catalunya
- European Union through the Marie Curie-COFUND actions
- Ramon y Cajal program (MINECO, Spain)
- Serra Hunter Programme (Generalitat de Catalunya)
- ICREA-Academia program from the Generalitat de Catalunya
- European Research Council (ERC) [683237] Funding Source: European Research Council (ERC)
The accumulation of an Organic Rich Layer (ORL) during the last deglaciation in the Alboran Sea (western Mediterranean Sea) and its link to changes in deep and intermediate water circulation are here investigated. Benthic foraminiferal assemblages and the shallow infaunal foraminifer Uvigerina peregrina delta C-13 record support the establishment of sustained high organic matter fluxes, and thus eutrophic conditions at the sea floor, during the late phase of the ORL (Younger Dryas to early Holocene periods). Since organic matter fluxes were lower (mesotrophic conditions) during the Bolling-Allerod period, they cannot be solely responsible for the ORL initiation. Geochemical, sedimentological and micropalaeontological proxies support a major weakening of the deep-water convection in the Gulf of Lion as the main driver for the development of poorly-ventilated conditions from intermediate depths (946 m) to the deep western Mediterranean basin that promoted the beginning of the ORL deposition. Nevertheless, a better ventilation at intermediate depths was established during the late ORL, while the deep basin remained poorly ventilated. We propose that our data reflect the arrival of a new better-ventilated intermediate water mass analogue to the current Levantine Intermediate Water (LIW) and/or a new intermediate water mass from the Gulf of Lion. The ultimate source of this water mass needs to be further explored but chronologies of the changes recorded here indicate that intermediate and deep ventilation phases were decoupled between the western and eastern Mediterranean basins during the deglaciation and early-middle Holocene. (C) 2019 The Authors. Published by Elsevier Ltd.
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