Analytical data of Ar/Ar sanidine dating of tephra SALAR T6

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Title:Main Title: Analytical data of Ar/Ar sanidine dating of tephra SALAR T6
Descriptions:Abstract: Analytical data of Ar/Ar sanidine dating of tephra SALAR T6 (20°59.862'S, 70°01.630'W). Sample was collected from Salar Grande site during the field campaign of March 2017. These data compliment and support the results presented in the journal article "Identification of humid periods in the Atacama Desert through hillslope activity established by infrared stimulated luminescence (IRSL) dating". Medialdea et al., 2019. Global and Planetary Change.
Table Of Contents: Volcanic horizon T6 was processed for using standard mineral separation procedures. After crushing and washing, heavy liquid mineral separation with densities of 2.54 and 2.59 g/cm3 was performed to obtain the sanidine from the sample. Mineral fractions were further purified by hand-picking under an optical microscope. The selected mineral separate was packed in a 6 mm ID AI packages and loaded together with Fish Canyon Tuff sanidine (FCs) standard in a 25 mm ID Al cup. Sample and standard were irradiated at the Oregon State University TRIGA reactor in the cadmium shielded CLICIT facility for 7 hours (irradiation code VU114). After irradiation, samples and standards were unpacked and loaded in a 185 hole Cu tray and baked overnight at 250 °C under vacuum. This tray was then placed in a doubly pumped vacuum chamber with Zn-Se window and baked overnight at 120 °C under high vacuum. This chamber was connected to a ThermoFisher NGPrep gas purification line equipped with a hot GP50, a cold finger (Lauda at -70 °C) and hot St707 getter. Sample (1-3 grains/fusion) and standards (1 grain/fusion) were fused using a 25W Synrad CO2 laser. Released gas was analysed on an ARGUS VI+ noble gas mass spectrometer at the Vrije Universiteit Amsterdam, The Netherlands, equipped with four Faraday cups at the H2, H1, AX and L1 positions and two compact discrete dynodes (CDDs) at positions L2 and L3. The system was equipped with a 1012 Ohm amplifier on H2 and 1013 Ohm amplifiers on H1, AX and L1 cups. Samples were run on H1-L3 collectors. Similar to Phillips and Matchan (2013) we did not apply bias corrections, but analysed samples and standards in the same tray (and thus at more or less the same time) alternating with air pipettes with intensities in the same range as the samples and standards. Line blanks were measured every 2-3 unknowns and were subtracted from succeeding sample data. Data reduction is done in ArArCalc (Koppers, 2002). Ages are calculated with decay constants from Min et al., 2000 and 28.201 Ma for FCs (Kuiper et al., 2008). The atmospheric 40Ar/36Ar air value of 298.56 is used (Lee et al., 2006). The correction factors for neutron interference reactions are (2.64 ± 0.02) x10-4 for (36Ar/37Ar)Ca, (6.73 ± 0.04) x10-4 for (39Ar/37Ar)Ca, (1.21 ± 0.003) x10-2 for (38Ar/39Ar)K and (8.6 ± 0.7) x10-4 for (40Ar/39Ar)K. Full analytical data is included in the table.
Identifier:10.5880/CRC1211DB.30 (DOI)
Responsible Party
Creators:Klaudia Kuiper (Author), Alicia Medialdea (Author), Matthias May (Author), Dominik Brill (Author), Georgina King (Author), Volker Wennrich (Author)
Funding Reference:Deutsche Forschungsgemeinschaft (DFG): CRC 1211: Earth - Evolution at the Dry Limit
Publisher:CRC1211 Database (CRC1211DB)
Publication Year:2019
Topic
CRC1211 Topic:Dating
Related Subproject:D5
Subject:Keyword: Dating
File Details
Filename:Ar-Ar_analyitical_data.xlsx
Data Type:Dataset - Dataset
File Size:212 KB
Date:Available: 12.11.2019
Mime Type:application/vnd.openxmlformats-officedocument.spreadsheetml.sheet
Data Format:MS Excel
Language:English
Status:Completed
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Download Permission:Free
General Access and Use Conditions:According to the CRC1211DB data policy agreement.
Access Limitations:According to the CRC1211DB data policy agreement.
Licence:None
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Specific Information - Data
Temporal Extent:15.03.2017, 13:00:00 - 15:30:00
Subtype:Natural Science Data
Metadata Details
Metadata Creator:Alicia Medialdea
Metadata Created:13.11.2019
Metadata Last Updated:13.11.2019
Subproject:D5
Funding Phase:1
Metadata Language:English
Metadata Version:V50
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