Seasonal patterns of carbonate diagenesis in nearshore terrigenous muds: Relation to spring phytoplankton bloom and temperature
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ID: 298704
1998
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Abstract
Pore water saturation state with respect to calcite and aragonite minerals in Long Island Sound sediments fluctuates from saturated and near saturated conditions during late fall, to undersaturated during winter, before slowly changing to supersaturated conditions during late spring. Undersaturation occurs during cold, winter periods when lower rates of ΣCO 2 production (low rates of heterotrophic metabolism) and oxidation of reduced minerals such as FeS lower calcium carbonate saturation states. Direct evidence that dissolution of both calcites and aragonite are occurring during this season comes from the simultaneous increases in excess pore water carbonate dissolution products Ca 2+ , F - , and Sr 2+ during periods of pore water undersaturation. Higher ΣCO 2 production rates during warmer periods cause the CO 3 2- concentration to become supersaturated for both calcite and aragonite. ΣCO 2 production is controlled by both temperature and substrate availability so that benthic deposition of organic matter produced during the spring bloom accelerates the seasonal progression of pore waters to supersaturation. These patterns control carbonate dynamics in temperate, nearshore regions, and result in a regularly observed, yearly cycling of calcium carbonate dominated by alternating periods of net dissolution and net precipitation.
| Reference Key |
openalex_W2020967180
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|---|---|
| Authors | Mark Green, Robert C. Aller |
| Journal | journal of marine research |
| Year | 1998 |
| DOI |
10.1357/002224098765173473
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| URL | |
| Keywords | Keywords not found |
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