Record of seafloor CaCO3 dissolution in the central equatorial Pacific

Publication Type  Journal Article
Year of Publication  2001
Authors  Broecker, W. S.; Anderson, R.; Clark, E.; Fleisher, M.
Journal Title  Geochemistry Geophysics Geosystems
Volume  2
Pages  art. no.-2000GC000151
Journal Date  Jun 28
ISBN Number  1525-2027
Accession Number  ISI:000170201200001
Key Words  caco3 distribution; marine geochemistry; biogeochemical processes; paleoceanography; benthic processes/benthos; th-230 measurements; sediments; calcite; o-2; ph
Abstract  

Shell weights for Globigerina sacculifer, Pulleniatina obliquiloculata, and Neogloboquadrina dutertrei from cores raised from a depth of 4.36 km (at 2 degreesS, 140 degreesW) reveal large dissolution-related shifts at Termination I and at the marine isotope stage 5-4 boundary. These shifts suggest that the carbonate ion concentration at this depth was similar to 27 mu mol kg(-1) higher during glacial time than during marine isotope stages 1 and 5 and that the boundaries separating these regimes were quite sharp (in other words, the dissolution chronology has a rectangular character). However, when compared to results for a much shallower core, there are disconcerting aspects to this data set. One is that the initial shell wall thickness may depend on growth conditions. Hence the estimates of paleocarbonate ion concentrations presented here remain tentative.

Notes  

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