THE INFLUENCE OF MICROHABITATS ON THE CARBON ISOTOPIC COMPOSITION OF DEEP-SEA BENTHIC FORAMINIFERA

被引:308
作者
McCorkle, Daniel C. [1 ]
Keigwin, Lloyd D. [1 ]
Corliss, Bruce H. [2 ]
Emerson, Steven R. [3 ]
机构
[1] Woods Hole Oceanog Inst, Dept Geol & Geophys, Woods Hole, MA 02543 USA
[2] Duke Univ, Dept Geol, Durham, NC 27706 USA
[3] Univ Washington, Sch Oceanog, Seattle, WA 98195 USA
来源
PALEOCEANOGRAPHY | 1990年 / 5卷 / 02期
关键词
D O I
10.1029/PA005i002p00161
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
We report delta C-13 and delta O-18 values for Rose Bengal-stained benthic foraminifera from a set of box cores from continental margin environments in the Atlantic and Pacific oceans. These isotopic results are compared with foraminiferal distribution data and pore water delta C-13 profiles to evaluate the importance of environmental (microhabitat) effects on the carbon isotopic composition of benthic foraminifera. The delta C-13 values of infaunal taxa are consistently lower than those of epifaunal taxa, suggesting that microhabitat effects on test composition do exist. The delta C-13 differences between foraminiferal carbonate and bottom water dissolved inorganic carbon are not correlated with the delta O-18 differences between benthic foraminifera tests and equilibrium calcite, but they do correlate with variations in the chemistry of sediment pore waters. However, interspecific delta O-18 differences as well as delta C-13 differences between species with similar vertical distributions in the sediments indicate that taxon-specific "vital" effects also influence test composition.
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页码:161 / 185
页数:25
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