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Gupta, Anil K; Sarkar, Sudipta; Mukherjee, Baidehi (2006): Distribution of benthic foraminifera in DSDP Hole 24-238 in the Central Indian Ocean (Appendix A). PANGAEA, https://doi.org/10.1594/PANGAEA.691485, Supplement to: Gupta, AK et al. (2006): Paleoceanographic changes during the past 1.9 Myr at DSDP Site 238, Central Indian Ocean Basin: Benthic foraminiferal proxies. Marine Micropaleontology, 60(2), 157-166, https://doi.org/10.1016/j.marmicro.2006.04.001

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Abstract:
Deep-sea benthic foraminifera have been quantitatively analyzed in samples (>125 µm size fraction) from Ocean Drilling Program (ODP) Site 238, to understand paleoceanographic changes in the Central Indian Basin over the past 1.9 Myr. Factor and cluster analyses of the 25 highest-ranked species made it possible to identify five biofacies, characterizing distinct deep-sea environmental settings. The environmental interpretation of each biofacies is based on the ecology of recent deep-sea benthic foraminifera. The benthic faunal record indicates fluctuating deep-sea conditions in environmental parameters including oxygenation, surface productivity and organic food supply. These changes appear to be linked to Indian summer monsoon variability, the main climatic feature of the Indian Ocean region. The benthic assemblages show a major shift at ~0.7 to 0.6 Ma, marked by major turnovers in the relative abundances of species, coinciding with an increased amplitude of glacial cycles. These cycles appear to have influenced low latitude monsoonal climate as well as deep-sea conditions in the Central Indian Ocean Basin.
Project(s):
Coverage:
Latitude: -11.153500 * Longitude: 70.526000
Date/Time Start: 1972-06-16T00:00:00 * Date/Time End: 1972-06-16T00:00:00
Minimum DEPTH, sediment/rock: 0.06 m * Maximum DEPTH, sediment/rock: 30.40 m
Event(s):
24-238 * Latitude: -11.153500 * Longitude: 70.526000 * Date/Time: 1972-06-16T00:00:00 * Elevation: -2832.0 m * Penetration: 586.5 m * Recovery: 424 m * Location: Indian Ocean//FRACTURE ZONE * Campaign: Leg24 * Basis: Glomar Challenger * Method/Device: Drilling/drill rig (DRILL) * Comment: 63 cores; 577 m cored; 9.5 m drilled; 73.5 % recovery
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1DEPTH, sediment/rockDepth sedmGeocode
2AGEAgeka BPGeocode
3Sample code/labelSample labelGupta, Anil KDSDP/ODP/IODP sample designation
4Astrononion umbilicatulumA. umbilicatulum%Gupta, Anil KCounting >125 µm fraction
5Bulimina alazanensisB. alazanensis%Gupta, Anil KCounting >125 µm fraction
6Cassidulina carinataC. carinata%Gupta, Anil KCounting >125 µm fraction
7Cibicidoides wuellerstorfiC. wuellerstorfi%Gupta, Anil KCounting >125 µm fraction
8Eggerella bradyiE. bradyi%Gupta, Anil KCounting >125 µm fraction
9Ehrenbergina carinataE. carinata%Gupta, Anil KCounting >125 µm fraction
10Epistominella exiguaE. exigua%Gupta, Anil KCounting >125 µm fraction
11Favocassidulina australisF. australis%Gupta, Anil KCounting >125 µm fraction
12Favocassidulina favusF. favus%Gupta, Anil KCounting >125 µm fraction
13Globocassidulina pacificaG. pacifica%Gupta, Anil KCounting >125 µm fraction
14Globocassidulina subglobosaG. subglobosa%Gupta, Anil KCounting >125 µm fraction
15Gyroidinoides cibaoensisG. cibaoensis%Gupta, Anil KCounting >125 µm fraction
16Gyroidinoides nitidulaG. nitidula%Gupta, Anil KCounting >125 µm fraction
17Gyroidinoides poliusG. polius%Gupta, Anil KCounting >125 µm fraction
18Laticarinina pauperataL. pauperata%Gupta, Anil KCounting >125 µm fraction
19Nuttallides umboniferaN. umbonifera%Gupta, Anil KCounting >125 µm fraction
20Oridorsalis umbonatusO. umbonatus%Gupta, Anil KCounting >125 µm fraction
21Pullenia bulloidesP. bulloides%Gupta, Anil KCounting >125 µm fraction
22Pullenia osloensisP. osloensis%Gupta, Anil KCounting >125 µm fraction
23Pullenia quinquelobaP. quinqueloba%Gupta, Anil KCounting >125 µm fraction
24Pyrgo murrhinaP. murrhina%Gupta, Anil KCounting >125 µm fraction
25Quinqueloculina weaveriQ. weaveri%Gupta, Anil KCounting >125 µm fraction
26Siphotextularia rolshauseniS. rolshauseni%Gupta, Anil KCounting >125 µm fraction
27Uvigerina hispidocostataU. hispidocostata%Gupta, Anil KCounting >125 µm fraction
28Uvigerina proboscideaU. proboscidea%Gupta, Anil KCounting >125 µm fraction
Size:
2340 data points

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