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Latest Miocene restriction of the Mediterranean Outflow Water: a perspective from the Gulf of Cadiz

机译:地中海流出水的最新内部限制:从加中毒湾的透视

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摘要

The Mediterranean-Atlantic water mass exchange provides the ideal setting for deciphering the role of gateway evolution in ocean circulation. However, the dynamics of Mediterranean Outflow Water (MOW) during the closure of the Late Miocene Mediterranean-Atlantic gateways are poorly understood. Here, we define the sedimentary evolution of Neogene basins from the Gulf of Cadiz to the West Iberian margin to investigate MOW circulation during the latest Miocene. Seismic interpretation highlights a middle to upper Messinian seismic unit of transparent facies, whose base predates the onset of the Messinian salinity crisis (MSC). Its facies and distribution imply a predominantly hemipelagic environment along the Atlantic margins, suggesting an absence or intermittence of MOW preceding evaporite precipitation in the Mediterranean, simultaneous to progressive gateway restriction. The removal of MOW from the Mediterranean-Atlantic water mass exchange reorganized the Atlantic water masses and is correlated to a severe weakening of the Atlantic Meridional Overturning Circulation (AMOC) and a period of further cooling in the North Atlantic during the latest Miocene.
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著录项

  • 来源
    《Geo-marine letters》 |2021年第2期|共17页
  • 作者单位

    Royal Holloway Univ London Dept Earth Sci Egham TW20 0EX Surrey England;

    Royal Holloway Univ London Dept Earth Sci Egham TW20 0EX Surrey England;

    Royal Holloway Univ London Dept Earth Sci Egham TW20 0EX Surrey England;

    Univ Salamanca Dept Geol Salamanca 37008 Spain;

    Naturgy Energy Grp SA Madrid 28033 Spain;

    Northumbria Univ Dept Geog &

    Environm Sci Newcastle Upon Tyne NE1 8ST Tyne &

    Wear England;

    Inst Geol &

    Minero Espana IGME Madrid 28003 Spain;

    Estrutura Missao Extensao Plataforma Continental P-2770047 Paco De Arcos Portugal;

    Off Natl Hydrocarbures &

    Mines ONHYM BP 99 Rabat Morocco;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 海洋学;
  • 关键词

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