Neritic and pelagic carbonate sedimentation in the marine environment: ignorance is not bliss |
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| Authors: | J D Milliman A W Droxler |
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| Institution: | (1) School of Marine Science, College of William and Mary, 23062 Gloucester Point, Virginia, USA;(2) Department of Geology and Geophysics, Rice University, 77251 Houston, Texas, USA |
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| Abstract: | Synthesis of available data allows us to define general patterns of late Quaternary carbonate production and sedimentation
in the global ocean. During high stands of sea level, the neritic and pelagic environments appear to sequester approximately
similar amounts of carbonate, whereas during low stands of sea level the decreased neritic zone produces and accumulates approximately
an order of magnitude less carbonate. Assuming that global accumulation of deep-sea carbonates remains more or less constant
during glacially induced changes in sea level, the ocean becomes depleted with respect to calcium carbonate during high stands
and recharges during low stands. Before we can achieve a better understanding of the global carbonate system, however, we
need a better understanding of key environments and processes: (a) production and accumulation on continental shelves both
as potential sinks (accumulation) and as sources (export to the deep sea); (b) a better measure of pelagic carbonate production;
and (c) late Quaternary (late Pleistocene and Holocene) mass accumulation rates in the deep sea. |
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| Keywords: | Calcium carbonate Sedimentation Production Ocean |
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