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Schmiedl, Gerhard; Mackensen, Andreas (2006): Stable oxygen isotope records of different benthic foraminiferal species of core GeoB3004-1 from the western Arabian Sea. doi:10.1594/PANGAEA.548185,
Supplement to: Schmiedl, G; Mackensen, A (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, doi:10.1029/2006PA001284

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Abstract:
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.
Coverage:
Latitude: 14.605000 * Longitude: 52.920000
Date/Time Start: 1995-03-07T16:44:00 * Date/Time End: 1995-03-07T16:44:00
Minimum DEPTH, sediment/rock: 0.03 m * Maximum DEPTH, sediment/rock: 10.13 m
Event(s):
GeoB3004-1 (M31/3-107_GC) * Latitude: 14.605000 * Longitude: 52.920000 * Date/Time: 1995-03-07T16:44:00 * Elevation: -1803.0 m * Recovery: 10.28 m * Location: Gulf of Aden * Campaign: M31/3 (BIGSET) * Basis: Meteor (1986) * Device: Gravity corer (Kiel type) (SL) * Comment: Penetration until weight, CC:H2S, clay-ooze, oliv-green, foraminifers
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1DEPTH, sediment/rockDepthmGeocode
2AGEAgeka BPGeocode
3Cibicidoides wuellerstorfi, d18OC. wuellerstorfi d18Oper mil PDBSchmiedl, GerhardMass spectrometer Finnigan MAT 251
4Cibicidoides wuellerstorfi, d13CC. wuellerstorfi d13Cper mil PDBSchmiedl, GerhardMass spectrometer Finnigan MAT 251
5Melonis barleeanus, d18OM. barleeanus d18Oper mil PDBSchmiedl, GerhardMass spectrometer Finnigan MAT 251
6Melonis barleeanus, d13CM. barleeanus d13Cper mil PDBSchmiedl, GerhardMass spectrometer Finnigan MAT 251
7Uvigerina peregrina, d18OU. peregrina d18Oper mil PDBSchmiedl, GerhardMass spectrometer Finnigan MAT 251
8Uvigerina peregrina, d13CU. peregrina d13Cper mil PDBSchmiedl, GerhardMass spectrometer Finnigan MAT 251
9Globobulimina affinis, d18OG. affinis d18Oper mil PDBSchmiedl, GerhardMass spectrometer Finnigan MAT 251
10Globobulimina affinis, d13CG. affinis d13Cper mil PDBSchmiedl, GerhardMass spectrometer Finnigan MAT 251
Size:
1500 data points

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