Journal
MARINE GEOLOGY
Volume 204, Issue 1-2, Pages 43-57Publisher
ELSEVIER
DOI: 10.1016/S0025-3227(03)00372-4
Keywords
calcium carbonate dissolution; calcite lysocline; planktic foraminifera; Globigerina bulloides; Last Glacial Maximum; South Atlantic
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The modern Atlantic Ocean, dominated by the interactions of North Atlantic Deep Water (NADW) and Antarctic Bottom Water (AABW), plays a key role in redistributing heat from the Southern to the Northern Hemisphere. In order to reconstruct the evolution of the relative importance of these two water masses, the NADW/AABW transition, reflected by the calcite lysocline, was investigated by the Globigerina bulloides dissolution index (BDX'). The depth level of the Late Glacial Maximum (LGM) calcite lysocline was elevated by several hundred metres, indicating a more corrosive water mass present at modern NADW level. Overall, the small range of BDX' data and the gradual decrease in preservation below the calcite lysocline point to a less stratified Atlantic Ocean during the LGM. Similar preservation patterns in the West and East Atlantic demonstrate that the modern west-east asymmetry did not exist due to an expansion of southern deep waters compensating for the decrease in NADW formation. (C) 2004 Elsevier B.V. All rights reserved.
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