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):
Deep Sea Drilling Project (DSDP)
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):
# | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
---|---|---|---|---|---|---|
1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
2 | AGE | Age | ka BP | Geocode | ||
3 | Sample code/label | Sample label | Gupta, Anil K | DSDP/ODP/IODP sample designation | ||
4 | Astrononion umbilicatulum | A. umbilicatulum | % | Gupta, Anil K | Counting >125 µm fraction | |
5 | Bulimina alazanensis | B. alazanensis | % | Gupta, Anil K | Counting >125 µm fraction | |
6 | Cassidulina carinata | C. carinata | % | Gupta, Anil K | Counting >125 µm fraction | |
7 | Cibicidoides wuellerstorfi | C. wuellerstorfi | % | Gupta, Anil K | Counting >125 µm fraction | |
8 | Eggerella bradyi | E. bradyi | % | Gupta, Anil K | Counting >125 µm fraction | |
9 | Ehrenbergina carinata | E. carinata | % | Gupta, Anil K | Counting >125 µm fraction | |
10 | Epistominella exigua | E. exigua | % | Gupta, Anil K | Counting >125 µm fraction | |
11 | Favocassidulina australis | F. australis | % | Gupta, Anil K | Counting >125 µm fraction | |
12 | Favocassidulina favus | F. favus | % | Gupta, Anil K | Counting >125 µm fraction | |
13 | Globocassidulina pacifica | G. pacifica | % | Gupta, Anil K | Counting >125 µm fraction | |
14 | Globocassidulina subglobosa | G. subglobosa | % | Gupta, Anil K | Counting >125 µm fraction | |
15 | Gyroidinoides cibaoensis | G. cibaoensis | % | Gupta, Anil K | Counting >125 µm fraction | |
16 | Gyroidinoides nitidula | G. nitidula | % | Gupta, Anil K | Counting >125 µm fraction | |
17 | Gyroidinoides polius | G. polius | % | Gupta, Anil K | Counting >125 µm fraction | |
18 | Laticarinina pauperata | L. pauperata | % | Gupta, Anil K | Counting >125 µm fraction | |
19 | Nuttallides umbonifera | N. umbonifera | % | Gupta, Anil K | Counting >125 µm fraction | |
20 | Oridorsalis umbonatus | O. umbonatus | % | Gupta, Anil K | Counting >125 µm fraction | |
21 | Pullenia bulloides | P. bulloides | % | Gupta, Anil K | Counting >125 µm fraction | |
22 | Pullenia osloensis | P. osloensis | % | Gupta, Anil K | Counting >125 µm fraction | |
23 | Pullenia quinqueloba | P. quinqueloba | % | Gupta, Anil K | Counting >125 µm fraction | |
24 | Pyrgo murrhina | P. murrhina | % | Gupta, Anil K | Counting >125 µm fraction | |
25 | Quinqueloculina weaveri | Q. weaveri | % | Gupta, Anil K | Counting >125 µm fraction | |
26 | Siphotextularia rolshauseni | S. rolshauseni | % | Gupta, Anil K | Counting >125 µm fraction | |
27 | Uvigerina hispidocostata | U. hispidocostata | % | Gupta, Anil K | Counting >125 µm fraction | |
28 | Uvigerina proboscidea | U. proboscidea | % | Gupta, Anil K | Counting >125 µm fraction |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
2340 data points
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