Relationships between the stable isotopic signatures of living and fossil foraminifera in Monterey Bay, California

Relationships between the stable isotopic signatures of living and fossil foraminifera in Monterey Bay, California

Fossil foraminifera are critical to paleoceanographic reconstructions including estimates of past episodes of methane venting. These reconstructions rely on benthic foraminifera incorporating and retaining unaltered the ambient isotopic compositions of pore fluids and bottom waters. Comparisons are...

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Veröffentlicht in:Geochemistry, geophysics, geosystems : G3 geophysics, geosystems : G3, 2004-04, Vol.5 (4), p.np-n/a
Hauptverfasser: Martin, Jonathan B., Day, Shelley A., Rathburn, Anthony E., Perez, M. Elena, Mahn, Chris, Gieskes, Joris
Format: Artikel
Sprache:eng
Schlagworte:
benthic foraminifera
carbon isotopes
methane seeps
oxygen isotopes
paleoclimate
pore water geochemistry
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Zusammenfassung:Fossil foraminifera are critical to paleoceanographic reconstructions including estimates of past episodes of methane venting. These reconstructions rely on benthic foraminifera incorporating and retaining unaltered the ambient isotopic compositions of pore fluids and bottom waters. Comparisons are made here of isotopic compositions of abundant live and fossil foraminifera (Uvigerina peregrina, Epistominella pacifica, Bulimina mexicana, and Globobulimina pacifica) collected in Monterey Bay, CA from two cold seeps (Clam Flats and Extrovert Cliffs) and from sediments ∼5 m outside of the Clam Flats seep. Clam Flats has steep δ13CDIC gradients (to
ISSN:1525-2027
1525-2027
DOI:10.1029/2003GC000629