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Singh, Raj K; Gupta, Anil K (2004): Relative abunances of benthic foraminifera in Late Oligocene to Miocene sediments of ODP Hole 121-757B from the southeastern Indian Ocean (Appendix Table 1). PANGAEA, https://doi.org/10.1594/PANGAEA.676895, Supplement to: Singh, RK; Gupta, AK (2005): Late Oligocene-Miocene paleoceanographic evolution of the southeastern Indian Ocean: evidence from deep-sea benthic foraminifera (ODP Site 757). Marine Micropaleontology, 51(1-2), 153-170, https://doi.org/10.1016/j.marmicro.2003.10.003

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Abstract:
We quantitatively analyzed deep-sea benthic foraminifera from >125 µm size fraction from Ocean Drilling Program (ODP) Site 757 to understand deep-sea paleoceanographic changes in the southeastern Indian Ocean during the late Oligocene-Miocene (26.5–5.35 Ma). We used the knowledge of the ecology of Recent deep-sea benthic foraminifera for environmental interpretations. Factor and cluster analyses were run using percentages of 46 highest-ranked species that helped identify six biofacies defining six clusters of samples. The faunal data document a major shift in deep-sea ventilation, organic carbon flux and productivity at ~8.3 Ma, coinciding with the major intensification of the Indian Ocean monsoon system. This marks a change from cold and well-oxygenated deep waters with low and pulsed organic carbon flux during 26.5 to ~8.3 Ma to oxygen-poor deep waters with sustained flux of organic matter. From 15.0 to 7.6 Ma, the deep-sea currents were stronger in the southeastern Indian Ocean probably due to major expansion of the East Antarctic ice sheet and increased production of deep waters and in turn increased deep-sea circulation. The productivity increased in the Indo-Pacific region in the late Miocene and the modern monsoon regime probably established at 8.3 Ma.
Project(s):
Coverage:
Latitude: -17.024000 * Longitude: 88.181600
Date/Time Start: 1988-06-01T11:00:00 * Date/Time End: 1988-06-04T06:15:00
Minimum DEPTH, sediment/rock: 39.21 m * Maximum DEPTH, sediment/rock: 103.08 m
Event(s):
121-757B * Latitude: -17.024000 * Longitude: 88.181600 * Date/Time Start: 1988-06-01T11:00:00 * Date/Time End: 1988-06-04T06:15:00 * Elevation: -1663.0 m * Penetration: 374.8 m * Recovery: 271.94 m * Location: South Indian Ridge, South Indian Ocean * Campaign: Leg121 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 43 cores; 374.8 m cored; 0 m drilled; 72.6 % recovery
Comment:
Age model of Peirce et al. (1989), numerical ages based on Berggren et al. (1995)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1DEPTH, sediment/rockDepthmGeocode
2AGEAgeka BPGeocode
3Sample code/labelSample labelGupta, Anil KODP sample designation
4Anomalina globulosaA. globulosa%Gupta, Anil KCounting >125 µm fraction
5Astrononion umbilicatulumA. umbilicatulum%Gupta, Anil KCounting >125 µm fraction
6Bolivina pusillaB. pusilla%Gupta, Anil KCounting >125 µm fraction
7Bolivina silvestrinaB. silvestrina%Gupta, Anil KCounting >125 µm fraction
8Bulimina alazanensisB. alazanensis%Gupta, Anil KCounting >125 µm fraction
9Bulimina macilentaB. macilenta%Gupta, Anil KCounting >125 µm fraction
10Buliminella carteriB. carteri%Gupta, Anil KCounting >125 µm fraction
11Cassidulina carinataC. carinata%Gupta, Anil KCounting >125 µm fraction
12Cassidulina laevigataC. laevigata%Gupta, Anil KCounting >125 µm fraction
13Cibicides bradyiC. bradyi%Gupta, Anil KCounting >125 µm fraction
14Cibicides cicatricosusC. cicatricosus%Gupta, Anil KCounting >125 µm fraction
15Cibicides pseudoungerianusC. pseudoungerianus%Gupta, Anil KCounting >125 µm fraction
16Cibicides wuellerstorfiC. wuellerstorfi%Gupta, Anil KCounting >125 µm fraction
17Discorbis subvilardeboanusD. subvilardeboanus%Gupta, Anil KCounting >125 µm fraction
18Eggerella bradyiE. bradyi%Gupta, Anil KCounting >125 µm fraction
19Ehrenbergina hystrixE. hystrix%Gupta, Anil KCounting >125 µm fraction
20Epistominella exiguaE. exigua%Gupta, Anil KCounting >125 µm fraction
21Epistominella guptaaeE. guptaae%Gupta, Anil KCounting >125 µm fraction
22Evolvocassidulina bradyiE. bradyi%Gupta, Anil KCounting >125 µm fraction
23Favocassidulina australisF. australis%Gupta, Anil KCounting >125 µm fraction
24Favocassidulina indicaF. indica%Gupta, Anil KCounting >125 µm fraction
25Francesita advenaF. advena%Gupta, Anil KCounting >125 µm fraction
26Gavelinopsis lobatulusG. lobatulus%Gupta, Anil KCounting >125 µm fraction
27Globocassidulina oblongaG. oblonga%Gupta, Anil KCounting >125 µm fraction
28Globocassidulina obtusaG. obtusa%Gupta, Anil KCounting >125 µm fraction
29Globocassidulina subglobosaG. subglobosa%Gupta, Anil KCounting >125 µm fraction
30Gyroidinoides cibaoensisG. cibaoensis%Gupta, Anil KCounting >125 µm fraction
31Gyroidinoides nitidulaG. nitidula%Gupta, Anil KCounting >125 µm fraction
32Gyroidinoides poliusG. polius%Gupta, Anil KCounting >125 µm fraction
33Nonionella aurisN. auris%Gupta, Anil KCounting >125 µm fraction
34Nuttallides umboniferaN. umbonifera%Gupta, Anil KCounting >125 µm fraction
35Oridorsalis umbonatusO. umbonatus%Gupta, Anil KCounting >125 µm fraction
36Orthomorphina columnarisO. columnaris%Gupta, Anil KCounting >125 µm fraction
37Osangularia culterO. culter%Gupta, Anil KCounting >125 µm fraction
38Pleurostomella alternansP. alternans%Gupta, Anil KCounting >125 µm fraction
39Pleurostomella brevisP. brevis%Gupta, Anil KCounting >125 µm fraction
40Pullenia bulloidesP. bulloides%Gupta, Anil KCounting >125 µm fraction
41Pullenia quinquelobaP. quinqueloba%Gupta, Anil KCounting >125 µm fraction
42Quadrimorphina laevigataQ. laevigata%Gupta, Anil KCounting >125 µm fraction
43Rectuvigerina royoiR. royoi%Gupta, Anil KCounting >125 µm fraction
44Robulus nicobarensisR. nicobarensis%Gupta, Anil KCounting >125 µm fraction
45Sphaeroidina bulloidesS. bulloides%Gupta, Anil KCounting >125 µm fraction
46Stilostomella lepidulaS. lepidula%Gupta, Anil KCounting >125 µm fraction
47Stilostomella subspinosaS. subspinosa%Gupta, Anil KCounting >125 µm fraction
48Uvigerina cushmaniU. cushmani%Gupta, Anil KCounting >125 µm fraction
49Uvigerina proboscideaU. proboscidea%Gupta, Anil KCounting >125 µm fraction
Size:
4277 data points

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