Bailey, Ian; Hemming, Sidney R; Reilly, Brendan T (2022): Ar-Ar ages of iceberg-rafted debris from Scotia Sea IODP Site 382-U1538 [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.946719
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Abstract:
Ar-Ar ages of 58 individual hornblendes and micas picked from a discrete iceberg-rafted layer deposited ~1.2 Ma at IODP U1538. The layer was recovered 310.79–310.82 meters below sea floor in Hole U1538A-36X-3W. All hornblende and mica (mostly biotite) were handpicked from the 250-μm to 1-mm size fraction, with additional mica picked from the 63–250-μm size fraction. Hornblende, biotite and standards were irradiated at the Cd-lined in-core facility (CLICIT) at the Oregon State reactor. 40Ar/39Ar ages were obtained using single-step CO2 laser fusion at the Lamont Doherty Earth Observatory argon geochronology lab (AGES: Argon Geochronology for the Earth Sciences) to release argon, followed by cleanup with Zr-Ar getters heated at 2-amps. Extracted and cleaned gases were measured on a VG5400 noble gas mass spectrometer in peak hopping mode on an analogue multiplier, using the program Massspec. Nuclear interference corrections used values for OSU from Renne et al. (1998), and data were also corrected for background and mass discrimination using measured blanks and air pipettes. J values used to calculate ages were based on co-irradiated Fish Canyon sanidine standard (28.201±0.046 Ma; Kuiper et al. (2008), with decay constants from Min et al. (2000)).
Keyword(s):
Supplement to:
Bailey, Ian; Hemming, Sidney R; Reilly, Brendan T; Rollinson, Gavyn; Williams, Trevor J; Weber, Michael E; Raymo, Maureen E; Peck, Victoria L; Ronge, Thomas A; Brachfeld, Stefanie A; O'Connell, Suzanne B; Tauxe, Lisa; Warnock, Jonathan; Armbrecht, Linda; Cardillo, Fabricio G; Du, Zhiheng; Fauth, Gerson; García, Marga M; Glueder, Anna; Guitard, Michelle; Gutjahr, Marcus; Hernández-Almeida, Iván; Hoem, Frida; Hwang, Ji-Hwan; Iizuka, Mutsumi; Kato, Yuji; Kenlee, Bridget; Martos, Yasmina M; Pérez, Lara F; Seki, Osamu; Tripathi, Shubham; Zheng, Xufeng (2022): Episodes of early Pleistocene West Antarctic Ice Sheet retreat recorded by Iceberg Alley sediments. Paleoceanography and Paleoclimatology, 37(7), https://doi.org/10.1029/2022PA004433
Further details:
Kuiper, Klaudia F; Deino, Alan L; Hilgen, Frederik J; Krijgsman, Wout; Renne, Paul; Wijbrans, J R (2008): Synchronizing rock clocks of earth history. Science, 320(5875), 500-504, https://doi.org/10.1126/science.1154339
Min, Kyoungwon; Mundil, Roland; Renne, Paul; Ludwig, Kenneth R (2000): A test for systematic errors in 40Ar/39Ar geochronology through comparison with U/Pb analysis of a 1.1-Ga rhyolite. Geochimica et Cosmochimica Acta, 64(1), 73-98, https://doi.org/10.1016/S0016-7037(99)00204-5
Project(s):
Funding:
National Science Foundation (NSF), grant/award no. OCE1450528: A Proposal to Manage the U.S. Science Support Program Office associated with the International Ocean Discovery Program (USSSP-IODP)
Natural Environment Research Council (NERC), grant/award no. NE/T006609/1: Reconstructing the Pleistocene history of Antarctic Ice Sheet mass loss
Coverage:
Latitude: -57.442080 * Longitude: -43.357818
Date/Time Start: 2019-05-04T05:45:00 * Date/Time End: 2019-05-10T19:30:00
Minimum Elevation: -3130.6 m * Maximum Elevation: -3130.6 m
Event(s):
382-U1538A * Latitude: -57.442080 * Longitude: -43.357818 * Date/Time Start: 2019-05-04T05:45:00 * Date/Time End: 2019-05-10T19:30:00 * Elevation: -3130.6 m * Penetration: 676 m * Recovery: 476.43 m * Campaign: Exp328 (Cascadia) * Basis: Joides Resolution * Method/Device: Core drilling (CDRILL)
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Run | Run | Bailey, Ian | |||
| 2 | Sample code/label | Sample label | Bailey, Ian | DSDP/ODP/IODP sample designation | ||
| 3 | Calcium/Potassium ratio | Ca/K | Bailey, Ian | |||
| 4 | Chlorine/Potassium ratio | Cl/K | Bailey, Ian | |||
| 5 | Argon-39 | 39Ar | arbitrary units | Bailey, Ian | Mol | |
| 6 | Argon-40, radiogenic | 40Ar* | % | Bailey, Ian | ||
| 7 | Age, mineral | Age mineral | Ma | Bailey, Ian | Laser fusion | |
| 8 | Age, standard deviation | Age std dev | ± | Bailey, Ian | ||
| 9 | Mineral name | Mineral | Bailey, Ian | |||
| 10 | Comment | Comment | Bailey, Ian |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
592 data points