Gupta, Anil K; Thomas, Ellen (2003): (Table DR1) Biofacies, percentages of important benthic foraminifera and isotope data at ODP Site 758 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.713682, Supplement to: Gupta, AK; Thomas, E (2003): Initiation of Northern Hemisphere glaciation and strengthening of the northeast Indian monsoon: Ocean Drilling Program Site 758, eastern equatorial Indian Ocean. Geology, 31(1), 47-50, https://doi.org/10.1130/0091-7613(2003)031%3C0047:IONHGA%3E2.0.CO;2
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Abstract:
The Indian monsoon system, as recorded by ocean-floor biota (benthic foraminifera) at Ocean Drilling Program Site 758 in the eastern equatorial Indian Ocean, has varied dramatically over the past 5.5 m.y., long after the onset of the monsoons at 10-8 Ma. Benthic foraminifera that thrive with high productivity year-round were common before the formation of Northern Hemisphere continental ice sheets ca. 3.1-2.5 Ma, indicating that the summer (southwest) monsoon had high intensity and long seasonal duration. Ca. 2.8 Ma benthic faunas became dominated by taxa that flourish with a seasonally strongly fluctuating food supply, indicating that the northeast (winter) monsoon, during which primary productivity is relatively low, increased in duration and strength to form a system similar to that of today. The change occurred coeval with the initiation of the Northern Hemisphere glaciation, documenting a close link between the development of the Indian monsoon and Northern Hemisphere glaciation.
Other version:
Project(s):
Ocean Drilling Program (ODP)
Coverage:
Latitude: 5.384067 * Longitude: 90.361167
Date/Time Start: 1988-06-15T00:00:00 * Date/Time End: 1988-06-15T00:00:00
Minimum DEPTH, sediment/rock: 0.04 m * Maximum DEPTH, sediment/rock: 70.43 m
Event(s):
121-758 * Latitude: 5.384067 * Longitude: 90.361167 * Date/Time Start: 1988-06-15T00:00:00 * Date/Time End: 1988-06-15T00:00:00 * Elevation: -2935.0 m * Penetration: 782.2 m * Recovery: 561.9 m * Location: Indian Ocean * Campaign: Leg121 * Basis: Joides Resolution * Method/Device: Composite Core (COMPCORE) * Comment: 84 cores; 782.2 m cored; 0 m drilled; 71.8% recovery
Comment:
Benthic foraminiferal species and biofacies:
Gs (Factor 1 positive scores)
Globocassidulina subglobosa (P)(0.70994)
Oridorsalis umbonatus (P)(0.63178)
Pullenia bulloides (S)(0.51520)
Cibicides kullenbergi (S)(0.39229)
Environment - relatively warm, intermediate organic flux, intermediate seasonality, moderate oxygenation
Up (Factor 1 negative scores)
Uvigerina proboscidea (P)(-0.77203)
U. hispido-costata (=peregrina ) (S)(-0.34283)
Environment - continuous, high organic flux, low seasonality
Sa (Factor 5 positive scores)
Stilostomella abyssorum (P)(0.63951)
Melonis pompilioides (P)(0.48769)
Cibicides bradyi (S)(0.39493)
Pleurostomella brevis (S)(0.39042)
P. obtusa (S)(0.29295)
Environment - high-moderate organic flux, intermediate seasonality
Mb (Factor 10 positive scores)
Melonis barleeanum (P)(0.71888)
Dentalina stimulea (S)(0.44626)
Pleurostomella acuminata (S)(0.32599)
P. obtusa (S)(0.30844)
P. brevis (S)(0.30620)
Environment - intermediate organic flux, intermediate to high seasonality, refractory organic matter
Ee (Factor 5 negative scores)
Epistominella exigua (P)(-0.47785)
Laticarinina pauperata (S)(-0.24486)
Pullenia osloensis (S)(-0.37974)
P. salisburyi (S)(-0.32038)
Environment - cool, strongly pulsed, low to intermediate organic flux, high seasonality
Nu (Factor 11 positive scores)
Nuttallides umbonifera (P)(0.68068)
Eggerella bradyi (S)(0.35639)
Environment - cool, carbonate corrosive, organic flux variable, high oxygenation
Pm (Factor 9 positive scores)
Pyrgo murrhina (P)(0.82297)
Karreriella bradyi (S)(0.54175)
Quinqueloculina lamarckiana (S)(0.23744)
Environment - cool, strongly pulsed organic flux, high oxygenation, high seasonality
Cc (Factor 3 positive scores)
Cassidulina carinata (P)(0.80245)
Gyroidinoides nitidula (P)(0.76187)
Pullenia bulloides (S)(0.36517)
Sphaeroidina bulloides (S)(0.29619)
Environment - intermediate organic flux, intermediate to high seasonality
Cw (Factor 8 positive scores)
Cibicides wuellerstorfi (P)(0.72310)
Sphaeroidina bulloides (S)(0.39942)
Anomalina globulosa (S)(0.39310)
Environment - cool, active currents, low-intermediate organic flux, high seasonality, high oxygenation
Note: In parentheses: factors and factor scores for each biofacies and species.
P = primary species, S = secondary species.
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | DEPTH, sediment/rock | Depth sed | m | Geocode | ||
| 2 | Sample code/label | Sample label | Gupta, Anil K | DSDP/ODP/IODP sample designation | ||
| 3 | Age model | Age model | ka | Gupta, Anil K | ||
| 4 | Facies name/code | Facies | Gupta, Anil K | Factor analysis, Q-mode | biofacies, detailes are in the comments | |
| 5 | Sample comment | Sample comment | Gupta, Anil K | Factor analysis, Q-mode | Factor | |
| 6 | Epistominella exigua | E. exigua | % | Gupta, Anil K | Counting >125 µm fraction | |
| 7 | Nuttallides umbonifera | N. umbonifera | % | Gupta, Anil K | Counting >125 µm fraction | |
| 8 | Uvigerina proboscidea | U. proboscidea | % | Gupta, Anil K | Counting >125 µm fraction | |
| 9 | δ13C | δ13C | ‰ PDB | Gupta, Anil K | Isotope ratio mass spectrometry | with respect to PDB for benthic voraminifera |
| 10 | δ18O | δ18O | ‰ | Gupta, Anil K | Isotope ratio mass spectrometry | with respect to PDB for benthic voraminifera |
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
Size:
1137 data points