10.1594/PANGAEA.548185
Schmiedl, Gerhard
Gerhard
Schmiedl
0000-0002-2177-6858
Mackensen, Andreas
Andreas
Mackensen
0000-0002-5024-4455
Stable oxygen isotope records of different benthic foraminiferal species of core GeoB3004-1 from the western Arabian Sea
PANGAEA
2006
DEPTH, sediment/rock
AGE
Cibicidoides wuellerstorfi, δ18O
Cibicidoides wuellerstorfi, δ13C
Melonis barleeanus, δ18O
Melonis barleeanus, δ13C
Uvigerina peregrina, δ18O
Uvigerina peregrina, δ13C
Globobulimina affinis, δ18O
Globobulimina affinis, δ13C
Gravity corer (Kiel type)
Mass spectrometer Finnigan MAT 251
M31/3
Meteor (1986)
Paleoenvironmental Reconstructions from Marine Sediments @ AWI (AWI_Paleo)
1995-03-07T16:44:00
en
Supplementary Dataset
10.1029/2006PA001284
1500 data points
text/tab-separated-values
Creative Commons Attribution 3.0 Unported
The stable isotope composition of one epifaunal and three infaunal benthic foraminiferal species of a sediment core from 1800 m water depth of the western Arabian Sea was determined to evaluate deepwater oxygenation, organic matter remineralization, and early diagenetic processes during the past 190,000 years. The d18O records reveal species-specific metabolic effects, susceptibility to changes in carbonate ion concentration, and supralysoclinal calcite dissolution. The foraminiferal d13C records reveal changes in the stable carbon isotope gradients of pore water dissolved inorganic carbon (d13CDIC) and in the microhabitat depth of infaunal species. Maximum d13CDIC offsets between bottom and pore waters ranged between mean values of 0.8 and 1.2% corresponding to estimates of deepwater oxygen concentration between approximately 1 and 2.7 ml/l. Intervals of improved deepwater oxygenation coincided with high benthic foraminiferal diversity and indicate the admixture of well-oxygenated deepwater masses during interglacials. During interglacial maxima the d13C difference between epifauna and shallow infauna indicates highest organic matter remineralization rates at times of maximum organic matter fluxes.
Supplement to: Schmiedl, Gerhard; Mackensen, Andreas (2006): Multispecies stable isotopes of benthic foraminifers reveal past changes of organic matter decomposition and deepwater oxygenation in the Arabian Sea. Paleoceanography, 21(4), PA4213
52.92
14.605
Gulf of Aden