Goussin, Fanny; Guillot, Stéphane; Ruffet, Gilles; Poujol, Marc; Oliot, Émilien; Replumaz, Anne; Cordier, Carole; Dupont-Nivet, Guillaume; Roperch, Pierrick (2021): K-Ar isotopy data of deformed samples from the Yushu mélange, western Jinsha Suture [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.932623
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Published: 2021-06-15 • DOI registered: 2023-11-17
Abstract:
Deformed samples from the Yushu mélange, in the western Jinsha Suture, have been dated by 40Ar/39Ar isotopy on micas and/or amphibole. Rock samples were crushed using standard procedures. Individual grains were handpicked from the 0.5-1-millimeter fraction of the crushed samples. Samples were irradiated in three batches, IR24, IR26 and IR36, at McMaster Nuclear Reactor (Hamilton, Ontario, Canada - https://nuclear.mcmaster.ca/facilities-equipment/facility-list/mcmaster-nuclear-reactor/) in its 8E high neutron flux facility. IR24 IR26 and IR36 lasted 50.967h, 50h and 200.95h with global efficiencies (J/h) of 4.97 x 10-5, 8.25 x 10-5 h-1 and 1.03 x 10-4 h-1. The analytical procedure is described by Ruffet et al. (1991, 1995). The irradiation standard were sanidine TCRs (28.608 ± 0.033 Ma according to Renne et al., 2011) for irradiation IR24 and IR26 and amphibole Hb3gr (1081.0 ± 1.2 Ma according to Renne et al., 2011) for irradiation IR36. Blanks were performed routinely each first or third/fourth run, and are subtracted from the subsequent sample gas fractions. Errors of apparent ages are plotted at the 1σ level and do not include the errors on the 40Ar*/39ArK ratio and age of the monitor and decay constant. The errors on the 40Ar*/39ArK ratio and age of the monitor and decay constant are included in the final calculation of the error margins on the pseudo-plateau and plateau ages. 40Ar/39Ar ages are provided with 2σ errors. Analytical data and parameters used for calculations (e.g. isotopic ratios measured on pure K and Ca salts; mass discrimination; atmospheric argon ratios; J parameter; decay constants) and reference sources are available in Table "Parameters used for Ar-Ar data analysis".
Related to:
Goussin, Fanny; Guillot, Stéphane; Ruffet, Gilles; Poujol, Marc; Oliot, Émilien; Replumaz, Anne; Cordier, Carole; Dupont-Nivet, Guillaume; Roperch, Pierrick (2021): U-Pb isotopy data of deformed samples from the Yushu mélange, western Jinsha Suture [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.928990
References:
Renne, Paul; Balco, Greg; Ludwig, Kenneth R; Mundil, Roland; Min, Kyoungwon (2011): Response to the comment by W.H. Schwarz et al. on "Joint determination of 40K decay constants and 40Ar∗/40K for the Fish Canyon sanidine standard, and improved accuracy for 40Ar/39Ar geochronology" by P.R. Renne et al. (2010). Geochimica et Cosmochimica Acta, 75(17), 5097-5100, https://doi.org/10.1016/j.gca.2011.06.021
Ruffet, Gilles; Feraud, Gilbert; Amouric, Marc (1991): Comparison of 40Ar-39Ar conventional and laser dating of biotites from the North Trégor Batholith. Geochimica et Cosmochimica Acta, 55(6), 1675-1688, https://doi.org/10.1016/0016-7037(91)90138-U
Ruffet, Gilles; Feraud, Gilbert; Balèvre, Michel; Kiénast, Jean-Robert (1995): Plateau ages and excess argon in phengites: an 40Ar/39Ar laser probe study of Alpine micas (Sesia Zone, Western Alps, northern Italy). Chemical Geology, 121(1-4), 327-343, https://doi.org/10.1016/0009-2541(94)00132-R
Documentation:
Coverage:
Median Latitude: 33.060796 * Median Longitude: 96.927952 * South-bound Latitude: 32.989194 * West-bound Longitude: 96.025278 * North-bound Latitude: 33.220750 * East-bound Longitude: 97.222111
Date/Time Start: 2014-10-05T00:00:00 * Date/Time End: 2015-07-27T00:00:00
Minimum Elevation: 3601.0 m * Maximum Elevation: 4762.0 m
Event(s):
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Goussin, Fanny | |||
| 2 | Sample code/label | Sample label | Goussin, Fanny | |||
| 3 | Steps | Steps | Goussin, Fanny | Step-heating and spot-fusion | ||
| 4 | Argon-40 | 40Ar | mV | Goussin, Fanny | Step-heating and spot-fusion | |
| 5 | Argon-40, error | 40Ar e | ± | Goussin, Fanny | Step-heating and spot-fusion | |
| 6 | Argon-39 | 39Ar | mV | Goussin, Fanny | Step-heating and spot-fusion | |
| 7 | Argon-39, error | 39Ar e | ± | Goussin, Fanny | Step-heating and spot-fusion | |
| 8 | Argon-37 | 37Ar | mV | Goussin, Fanny | Step-heating and spot-fusion | |
| 9 | Argon-37, error | 37Ar e | ± | Goussin, Fanny | Step-heating and spot-fusion | |
| 10 | Argon-36 | 36Ar | mV | Goussin, Fanny | Step-heating and spot-fusion | |
| 11 | Argon-36, error | 36Ar e | ± | Goussin, Fanny | Step-heating and spot-fusion | |
| 12 | Argon-40/Argon-39 | 40Ar/39Ar | Goussin, Fanny | Step-heating and spot-fusion | 40Ar*/39ArK: 40Ar*= radiogenic 40Ar; 39ArK =produced by K neutron interferences | |
| 13 | Argon-40/Argon-39 ratio, error | 40Ar/39Ar e | ± | Goussin, Fanny | Step-heating and spot-fusion | 40Ar*/39ArK: 40Ar*= radiogenic 40Ar; 39ArK =produced by K neutron interferences |
| 14 | Age, mineral | Age mineral | Ma | Goussin, Fanny | Apparent age | |
| 15 | Age, error | Age e | ± | Goussin, Fanny | ||
| 16 | Time in days | Time d | days | Goussin, Fanny | Delay to irradiation | |
| 17 | Parameter | Parameter | arbitrary units | Goussin, Fanny | J parameter | |
| 18 | Error, absolute | Error a | ± | Goussin, Fanny | J parameter | |
| 19 | Parameter | Parameter | arbitrary units | Goussin, Fanny | Mass Discrimination (1+e) | |
| 20 | Error, absolute | Error a | ± | Goussin, Fanny | Err Discrimination |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
5487 data points
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