Catunda, Maria Carolina Amorim (2021): Magnesium/Calcium ratios measured on planktic foraminifera G. crassaformis and deep-thermocline temperatures of the central North Atlantic during the Mid-Pleistocene Transition (MIS 14-36), IODP Site 306-U1313 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.932296
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Abstract:
This dataset lists the results of trace element analysis of the foraminifera Globorotalia crassaformis from Integrated Ocean Drilling Program Site U1313 (41°N, 33°W, 3426 m water depth, Expedition 306) relative to the Mid-Pleistocene Transition interval (0.55 Ma - 1.2 Ma). Site U1313 was chosen for its location in between the subtropical and subpolar gyres, along the main northward heat pathway. Sections from the primary splice were sampled every 5 cm between 26.82 adjusted composite depth in meters (amcd, Naafs et al. 2012) and 56.77 amcd at the IODP Core Repository in Bremen, Germany. The age model for this Site was updated using oxygen isotopes from benthic foraminifera (available in an accompanying dataset). Tests of G. crassaformis were picked, crushed, cleaned, and analyzed at the Institut für Geowissenschaften, Universität Heidelberg, Germany. Chemical cleaning followed the procedures described by Martin and Lea (2002) without the diethylenetriaminepentaacetic acid (DTPA) step. Fe/Ca and Mn/Ca ratios were additionally analyzed to monitor contamination by siliciclastic material and diagenetic overgrowths. Mg/Ca ratios were used to calculate deep thermocline temperatures following the species-specific equation as published by Cléroux et al. (2013). The reconstructed subsurface temperature dataset has an average resolution of 1.5 kyr and was used to calculate a vertical temperature gradient at Site U1313, interpreted as indicative of upper-ocean stratification (the calculated gradient is also available in an accompanying dataset). Cléroux et al, 2013 - doi:10.1002/palo.20050 Martin and Lea, 2002 - doi:10.1029/2001GC000280 Naafs et al., 2012 - doi10.1016/j.epsl.2011.11.026
Supplement to:
Catunda, Maria Carolina Amorim; Bahr, André; Kaboth-Bahr, Stefanie; Zhang, Xu; Foukal, N; Friedrich, Oliver (2021): Subsurface Heat Channel Drove Sea Surface Warming in the High‐Latitude North Atlantic During the Mid‐Pleistocene Transition. Geophysical Research Letters, 48(11), https://doi.org/10.1029/2020GL091899
Related to:
Cléroux, Caroline; deMenocal, Peter B; Arbuszewski, Jennifer; Linsley, Braddock K (2013): Reconstructing the upper water column thermal structure in the Atlantic Ocean. Paleoceanography, 28(3), 503-516, https://doi.org/10.1002/palo.20050
Martin, Pamela A; Lea, David W (2002): A simple evaluation of cleaning procedures on fossil benthic foraminiferal Mg/Ca. Geochemistry, Geophysics, Geosystems, 3(10), 1-8, https://doi.org/10.1029/2001GC000280
Naafs, Bernhard David A; Hefter, Jens; Acton, Gary D; Haug, Gerald H; Martínez‐García, Alfredo; Pancost, Richard D; Stein, Ruediger (2012): Strengthening of North American dust sources during the late Pliocene (2.7 Ma). Earth and Planetary Science Letters, 317-318, 8-19, https://doi.org/10.1016/j.epsl.2011.11.026
Project(s):
Funding:
German Research Foundation (DFG), grant/award no. DFG BA 3809/8: Evolution of the oceanic circulation in the subtropical Atlantic across the Mid-Pleistocene Transition
Coverage:
Median Latitude: 41.000023 * Median Longitude: -32.957155 * South-bound Latitude: 41.000022 * West-bound Longitude: -32.957300 * North-bound Latitude: 41.000023 * East-bound Longitude: -32.957010
Minimum Elevation: -3413.5 m * Maximum Elevation: -3412.7 m
Event(s):
306-U1313B * Latitude: 41.000023 * Longitude: -32.957300 * Elevation: -3413.5 m * Recovery: 306.54 m * Campaign: Exp306 (North Atlantic Climate 2) * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 32 cores; 300.4 m cored; 102 % recovered; 2 m drilled; 302.4 m penetrated
306-U1313C * Latitude: 41.000022 * Longitude: -32.957010 * Elevation: -3412.7 m * Recovery: 305.79 m * Campaign: Exp306 (North Atlantic Climate 2) * Basis: Joides Resolution * Method/Device: Drilling/drill rig (DRILL) * Comment: 32 cores; 293.4 m cored; 104.2 % recovered; 0 m drilled; 293.4 m penetrated
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Catunda, Maria Carolina Amorim | |||
| 2 | Laboratory code/label | Lab label | Catunda, Maria Carolina Amorim | |||
| 3 | AGE | Age | ka BP | Catunda, Maria Carolina Amorim | Geocode – Naafs et al., 2012 | |
| 4 | AGE | Age | ka BP | Catunda, Maria Carolina Amorim | Geocode – Catunda et al., 2021 | |
| 5 | Sample code/label | Sample label | Catunda, Maria Carolina Amorim | DSDP/ODP/IODP sample designation | ||
| 6 | Depth, composite | Depth comp | mcd | Catunda, Maria Carolina Amorim | IODP Depth Scale Terminology | AMCD |
| 7 | Globorotalia crassaformis, Magnesium/Calcium ratio | G. crassaformis Mg/Ca | mmol/mol | Catunda, Maria Carolina Amorim | ECRM corrected | |
| 8 | Globorotalia crassaformis, Manganese/Calcium ratio | G. crassaformis Mn/Ca | mmol/mol | Catunda, Maria Carolina Amorim | ECRM corrected | |
| 9 | Globorotalia crassaformis, IronCalcium ratio | G. crassaformis Fe/Ca | mmol/mol | Catunda, Maria Carolina Amorim | ECRM corrected | |
| 10 | Sub-surface temperature | SubT | °C | Catunda, Maria Carolina Amorim | Calculated from Mg/Ca ratios (Cléroux et al. 2013) |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
3710 data points
Download Data
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