Title of article :
Carbon and oxygen isotope geochemistry of live (stained) benthic foraminifera from the Aleutian Margin and the Southern Australian Margin
Author/Authors :
Basak، نويسنده , , Chandranath and Rathburn، نويسنده , , Anthony E. and Pérez، نويسنده , , M. Elena and Martin، نويسنده , , Jonathan B. and Kluesner، نويسنده , , Jared W. and Levin، نويسنده , , Lisa A. and De Deckker، نويسنده , , Patrick and Gieskes، نويسنده , , Joris M. and Abriani، نويسنده , , Michelle، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2009
Pages :
13
From page :
89
To page :
101
Abstract :
Comparisons of ambient bottom-water geochemistry and stable isotopic values of the tests of living (stained) calcareous benthic foraminifera from the North Pacific (on the Aleutian Margin, water depth 1988 m) and Murray Canyons group in the Southern Indian Ocean (Australian Margin, water depths 2476 m and 1634 m) provide modern environmental analogs to calibrate paleoenvironmental assessments. Consistent with the hypothesis that microhabitat preferences influence foraminiferal isotopic values, benthic foraminifera from both margins were depleted in 13C with respect to bottom-water dissolved inorganic carbon (DIC). The carbon isotope values of deep infaunal foraminifera (Chilostomella oolina, Globobulimina pacifica) showed greater differences from estimates of those of DIC than shallow benthic foraminifera (Bulimina mexicana, Bolivinita quadrilatera, Pullenia bulloides). This study provides new isotopic and ecological information for B. quadrilatera. The mean Δδ13C value, defined as foraminiferal δ13C values minus estimated ambient δ13C values from the Aleutian Margin, is 0.97‰ higher for G. pacifica than the mean from the Murray Canyon. This difference may result either from genetic or biological differences between the populations or from differences in environmental isotopic influences (such as pore water differences) that were not accounted for in the equilibrium calculations. These analyses provide calibration information for the evaluation of bottom water conditions and circulation patterns of ancient oceans based on fossil foraminiferal geochemistry.
Keywords :
stable isotopes , benthic foraminifera , ?13C , deep sea ecology , Australian Margin , SE Indian Ocean , Microhabitats , Aleutian Margin , ?18O
Journal title :
Marine Micropaleontology
Serial Year :
2009
Journal title :
Marine Micropaleontology
Record number :
2263344
Link To Document :
بازگشت