Calcite dissolution along a transect in the western tropical Indian Ocean: A multiproxy approach

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dc.contributor.author Naik, S.S.
dc.contributor.author Naidu, P.D.
dc.date.accessioned 2008-01-31T07:15:52Z
dc.date.available 2008-01-31T07:15:52Z
dc.date.issued 2007
dc.identifier.citation Geochemistry Geophysics Geosystems, Vol.8; doi:10.1029/2007GC001615; 8 pp.
dc.identifier.uri http://drs.nio.org/drs/handle/2264/729
dc.description.abstract Three paleocarbonate ion proxies, size index, planktonic foraminifera shell weight, and calcite crystallinity, have been employed here to a set of core top samples from the western tropical Indian Ocean in the water depth ranges from 1086 to 4730 m. All three proxies complement each other well and reveal that calcite dissolution starts to affect planktonic foraminifera from 2250 m depth onward and intense calcite dissolution begins around 3900 m depth in this sector of the tropical Indian Ocean. Three planktonic foraminifera species, Globigerinoides sacculifer, Pulleniatina obliquiloculata, and Neogloboquadrina dutertrei, show wide variability in shell weights from core top sediments in the depth range of 3300 to 3400 m bathed by similar bottom water CO sub(3) sup (=*) concentrations. This variability is attributed to shell calcification, and shell weights are controlled by CO sub(3) sup(=) concentration in the surface waters. Further, surface water CO sub(3) sup(=) concentrations override milder dissolution effects experienced by samples from shallower water depths bathed by similar bottom water CO sub(3) sup (= *) concentrations
dc.language.iso en
dc.publisher American Geophysical Union
dc.subject calcite
dc.subject calcite dissolution
dc.subject foraminifera
dc.subject crystallization
dc.subject sediments
dc.subject ions
dc.subject palaeo studies
dc.subject plankton
dc.title Calcite dissolution along a transect in the western tropical Indian Ocean: A multiproxy approach
dc.type Journal Article


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