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Yadav, Ramanand; Naik, Sushant S; Naidu, Pothuri Divakar (2022): Shell weights above the lysocline over the last ~40 ka measured in sediment core SSD044_GC01 from the equatorial Indian Ocean [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.948520

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Published: 2022-09-20 • DOI registered: 2022-12-24

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Abstract:
In this data set, we present the low carbonate ion condition in the deep sea region of the central Equatorial Indian Ocean (5°N & 77°E) over the last 40ka. The marine sediment core SSD044_GC-01 was collected during the 044th Cruise of RV Sindhu (SSD044) Sadhana using a Gravity corer. The age model of the core was obtained using four accelerator mass spectrometry (AMS ) 14C dates on ~15 mg of mixed planktic foraminiferal species, viz, Globigerinoides ruber, Globigerinoides sacculifer, Neogloboquadrina dutertrei and Globorotalia menardii. The radiocarbon dates were calibrated to calendar ages using the calib 7.1 programme (Reimer et al., 2013). For the analysis of shell weights of selected planktic foraminifera, a portion of the Coarse Fraction was adequately cleaned and sonicated. The >63 μm residue was dry sieved between 300 and 355 μm size fractions. Fifty tests of G. ruber, P. obliquiloculata, and N. dutertrei were picked and weighed on a microbalance (1σ precision: ± 2 μg, n =10). Shell weights of selected planktic foraminifera (G. ruber, P. obliquiloculata, N. dutertrei) show a low carbonate ion concentration in the deep sea region of the study area.
Keyword(s):
calcite dissolution; carbonate ion; Central equatorial Indian Ocean; Foraminiferal dissolution indices; Lysocline
Related to:
Yadav, Ramanand; Naik, Sushant S; Naidu, Pothuri Divakar (2022): Contrasts in calcium carbonate dissolution above the lysocline in the equatorial Indian Ocean over the last ~40 ka. Marine Geology, 444, 106717, https://doi.org/10.1016/j.margeo.2021.106717
Yadav, Ramanand; Naik, Sushant S; Naidu, Pothuri Divakar (2022): Dissolution indices above the lysocline over the last ~40 ka measured in sediment core SSD044_GC01 from the central equatorial Indian Ocean [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.948518
Yadav, Ramanand; Naik, Sushant S; Naidu, Pothuri Divakar (2022): Species abundances above the lysocline over the last ~40 ka measured in sediment core SSD044_GC01 from the equatorial Indian Ocean [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.948516
Funding:
Ministry of Earth Sciences (MOES), grant/award no. Gap-2949: Biogeochemical Process and Paleoceanographic Studies of the Eastern Indian Ocean, Geological Oceanography Division
Coverage:
Latitude: 5.000000 * Longitude: 77.000000
Date/Time Start: 2017-11-23T00:00:00 * Date/Time End: 2017-11-23T00:00:00
Minimum DEPTH, sediment/rock: 3 m * Maximum DEPTH, sediment/rock: 149 m
Event(s):
SSD044_GC-01 * Latitude: 5.000000 * Longitude: 77.000000 * Date/Time: 2017-11-23T00:00:00 * Elevation: 3160.0 m * Location: Equatorial Indian Ocean * Campaign: SSD-044 * Basis: Sindhu Sadhana * Method/Device: Gravity corer (GC)
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1 DEPTH, sediment/rockDepth sedmYadav, RamanandGeocode
2 AGEAgeka BPYadav, RamanandAge, 14C calibrated, CALIB 7.1 (Reimer et al., 2013)Geocode
3 Neogloboquadrina dutertrei, shell, weightN. dutertrei shell WµgYadav, RamanandMicrobalance
4 Pulleniatina obliquiloculata, shell, weightP. obliquiloculata shell WµgYadav, RamanandMicrobalance
5 Globigerinoides ruber albus, shell, weightG. ruber albus shell WµgYadav, RamanandMicrobalance
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
222 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 
Depth sed [m]		2 
Age [ka BP]		3 
N. dutertrei shell W [µg]		4 
P. obliquiloculata shell W [µg]		5 
G. ruber albus shell W [µg]
32.516.9800014.2400012.90000
53.214.8600014.0000013.00000
73.916.6600013.0200014.86000
94.718.4489818.0800012.91837
115.419.4600021.0400015.04082
136.116.8400015.4800013.33333
156.921.4600015.5800014.10417
177.619.9600016.3200014.20000
198.322.6600017.8367314.04082
219.019.2400018.6600015.10000
239.821.3800018.5400015.97872
2510.524.2400017.9200014.94000
2711.218.5200018.3600016.93750
2912.029.7600018.2800015.40000
3112.725.1458316.9400015.78000
3313.422.1600018.7600015.10204
3514.216.9795917.8200015.06383
3714.923.8600019.3800011.89130
3915.622.8367319.6400013.34783
4116.321.8000019.3061218.92000
4317.122.7755118.6326516.04000
4517.829.3800020.4800016.85106
4718.522.3200015.2800015.66667
4919.327.6739119.2040815.36000
5119.922.1632717.7600015.10000
5320.323.6400021.9183716.32000
5520.823.7600020.1400015.36000
5721.322.7800020.6400015.44898
5921.823.5600019.7000014.38000
6122.226.5800020.1400015.78723
6322.723.0200019.9200014.40000
6523.225.0600020.4600015.72000
6723.723.8600020.2400016.72000
6924.121.7800020.1600016.92000
7124.621.9600018.4166715.54000
7325.126.0000017.8571415.22000
7525.620.4583319.1800015.46000
7726.021.8400020.3000015.08000
7926.523.8800020.3600015.30000
8127.020.1000019.0400014.36000
8327.527.4600020.7600016.66000
8527.923.7600019.5600016.68000
8728.421.9200019.0625015.76000
8928.924.1800018.9600017.04000
9129.425.2200017.7400014.90000
9329.826.4200017.1600014.25532
9530.328.1875017.5800016.50000
9730.819.4800017.2200015.56000
9931.323.9000017.5306117.04000
10131.722.9200022.9000015.92000
10332.223.1800017.6600015.30000
10532.725.2000019.9000017.02000
10733.220.5600018.5400013.08000
10933.720.9800017.9000014.98000
11134.221.2000019.4400015.90000
11334.720.7755119.7600015.60000
11535.221.9183717.0600016.06000
11735.722.2800017.8400016.82000
11936.127.4000017.4000015.10000
12136.623.0200018.0408215.90000
12337.122.6000018.0800018.68000
12537.622.2800019.4200016.68000
12738.128.1632719.3200016.48000
12938.621.3200017.8200015.72000
13139.120.3200018.6734714.30000
13339.620.2708318.3469415.08000
13540.022.6200018.7400015.92000
13740.522.0400018.6600015.74000
13941.020.4600018.5200016.90000
14141.521.0200020.1458314.60000
14342.024.6938818.5600018.20000
14542.525.1600018.1020416.04000
14743.019.1428617.6000015.50000
14943.519.2083318.6000015.47917