Atmospheric re-organization during Marine Isotope Stage 3 over the North American continent: sedimentological and mineralogical evidence from the Gulf of Mexico

QUATERNARY SCIENCE REVIEWS

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Article

Sionneau, T.¹  Bout-Roumazeilles, V.¹  Meunier, G.^1,2  Kissel, C.³  Flower, B. P.⁴  Bory, A.¹  Tribovillard, N.¹ 

[1] Univ Lille 1, CNRS, UMR Geosyst 8217, Cite Sci, F-59655 Villeneuve Dascq, France

[2] Univ Franche Comte, UMR 6249, CNRS, Lab Chronoenvironm, F-25030 Besancon, France

[3] Lab Sci Climat & Environm, F-91198 Gif Sur Yvette, France

[4] Univ S Florida, Coll Marine Sci, St Petersburg, FL 33701 USA

关键词: Orca Basin;    Mississippi River;    Marine Isotope Stage 3;    Clay mineralogy;    Meltwater inputs;    Paleoatmospheric configurations;   

DOI  :  10.1016/j.quascirev.2013.10.002

来源: Elsevier

【 摘 要 】

Mineralogical and sedimentological records from the Gulf of Mexico (GOM) reveal major changes in the terrigenous particles provenance during the Marine Isotopic Stage 3 (MIS3) that likely resulted from modifications of the environmental conditions including glacial activity and precipitation distribution - over the North American continent. The southeastern margin of the Laurentide Ice Sheet (US) was active throughout the entire MIS3, whereas the southwestern margin contributed to short-term meltwater events only during late MIS3. Some of the major mineralogical changes cannot be attributed to glacial activity but rather result from the changes in precipitation distribution. Combining sedimentological records from the GOM with previously published climate-related archives from the North American continent allows the reconstruction of two main schematic patterns of moisture inflow and precipitation distribution that may have prevailed during MIS3. Meltwater discharges contribute to modifying the US configuration and the GOM hydrological properties, ultimately affecting large-scale oceanic circulation and may have influenced atmospheric re-organizations although the insolation variation rate appears to be the main driver of the system. (C) 2013 Elsevier Ltd. All rights reserved.

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