Braza, Mary; McQuarrie, Nadine; Robinson, Delores M; Webb, Laura E (2023): (U-Th)/He ages from zircons collected in the far western Nepal Himalaya: raw data [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.960123, In: Braza, M et al. (2023): (U-Th)/He ages from zircons collected in the far western Nepal Himalaya [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.960122
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Published: 2023-08-24 • DOI registered: 2023-09-22
Abstract:
This dataset contains the results of 11 individual (U-Th)/He analyses using zircons extracted from bedrock samples collected from medium-high grade metamorphic rocks along the Api transect in the far western Nepal Himalaya. Bedrock samples were collected for thermochronologic cooling ages to better constrain the exhumation history of the Nepal Himalaya. Analytical methods followed the general procedures outlined in Reiners (2005) and Reiners et al. (2004). The Full ZHe Data Raw contains results for each zircon grain measurement (typically three per sample).
References:
Reiners, Peter W (2005): Zircon (U-Th)/He Thermochronometry. Reviews in Mineralogy & Geochemistry, 58(1), 151-179, https://doi.org/10.2138/rmg.2005.58.6
Reiners, Peter W; Spell, Terry L; Nicolescu, Stefan; Zanetti, Kathleen A (2004): Zircon (U-Th)/He thermochronometry: He diffusion and comparisons with 40Ar/39Ar dating. Geochimica et Cosmochimica Acta, 68(8), 1857-1887, https://doi.org/10.1016/j.gca.2003.10.021
Coverage:
Median Latitude: 29.535747 * Median Longitude: 80.741245 * South-bound Latitude: 29.096190 * West-bound Longitude: 80.569530 * North-bound Latitude: 29.902140 * East-bound Longitude: 80.948280
Date/Time Start: 2017-05-04T03:39:38 * Date/Time End: 2017-05-18T03:46:37
Minimum Elevation: 1459.0 m * Maximum Elevation: 3132.0 m
Event(s):
FWN17-110B * Latitude: 29.096190 * Longitude: 80.569530 * Elevation: 1461.0 m * Location: Nepal * Method/Device: Rock sample (ROCK) * Comment: Map unit: Sangram Fm., lithology: quartzite
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | Braza, Mary | |||
| 2 | Latitude of event | Latitude | Braza, Mary | |||
| 3 | Longitude of event | Longitude | Braza, Mary | |||
| 4 | Elevation of event | Elevation | m | Braza, Mary | ||
| 5 | Sample code/label | Sample label | Braza, Mary | |||
| 6 | Location | Location | Braza, Mary | Map unit | ||
| 7 | Main Lithology | Main lith | Braza, Mary | |||
| 8 | Uranium | U | ng | Braza, Mary | ||
| 9 | Thorium | Th | ng | Braza, Mary | ||
| 10 | Uranium/Thorium ratio | U/Th | Braza, Mary | |||
| 11 | Age, mineral | Age mineral | Ma | Braza, Mary | raw age | |
| 12 | Age, mineral, standard deviation | Age mineral std dev | ± | Braza, Mary | 1s | |
| 13 | alpha-ejection correction | Ft | Braza, Mary | Ft 238U | ||
| 14 | alpha-ejection correction | Ft | Braza, Mary | Ft 235U | ||
| 15 | alpha-ejection correction | Ft | Braza, Mary | Ft 232Th | ||
| 16 | alpha-ejection correction | Ft | Braza, Mary | Ft 147Sm | ||
| 17 | Size | Size | µm | Braza, Mary | Rs: width of the rims around the crystals | |
| 18 | Age, mineral | Age mineral | Ma | Braza, Mary | corrected age | |
| 19 | Age, mineral, standard deviation | Age mineral std dev | ± | Braza, Mary | 1s | |
| 20 | Mass | Mass | g | Braza, Mary | ||
| 21 | Uranium | U | mg/kg | Braza, Mary | ppm U (Zr) | |
| 22 | Thorium | Th | mg/kg | Braza, Mary | ppm Th (Zr) | |
| 23 | Helium-4 | 4He | nmol/kg | Braza, Mary | ||
| 24 | Uranium | U | mg/kg | Braza, Mary | ppm eU (Zr) | |
| 25 | Ratio | Ratio | Braza, Mary | eU (morph)/eU (Zr) |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC) * Processing Level: PANGAEA data processing level 3 (ProcLevel3)
Size:
693 data points