Braza, Mary; McQuarrie, Nadine; Battistella, Claire; Robinson, Delores M: (U-Th)/He ages from zircons collected in the western Nepal Himalaya [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.992630 (dataset in review)
Abstract:
This dataset contains the results of 13 individual (U-Th)/He analyses using zircons extracted from bedrock samples collected from medium-high grade metamorphic rocks along the Simikot transect in western Nepal. Bedrock samples were collected for thermochronologic cooling ages to better constrain the exhumation history of the western Nepal Himalaya. Analytical methods followed the general procedures outlined in Reiners (2005, doi:10.2138/rmg.2005.58.6) and Reiners et al. (2004, doi:10.1016/j.gca.2003.10.021). The data table contains results for each zircon grain measurement (three per sample) and includes the mean age for each sample, calculated from three zircon grains, and an error that spans the range in measured ages and includes a 2σ analytical error.
Supplement to:
Braza, Mary; McQuarrie, Nadine; Battistella, Claire; Robinson, Delores M (in prep.): Structural drivers of exhumation in compressional orogens: Examples from western Nepal.
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: 29.326469 * Median Longitude: 81.724846 * South-bound Latitude: 28.684000 * West-bound Longitude: 81.477500 * North-bound Latitude: 29.855700 * East-bound Longitude: 81.880600
Date/Time Start: 2017-04-22T05:37:22 * Date/Time End: 2017-05-02T03:17:12
Minimum DEPTH, sediment/rock: 0 m * Maximum DEPTH, sediment/rock: 0 m
Event(s):
FWN17-015 * Latitude: 29.855700 * Longitude: 81.880600 * Date/Time: 2017-04-22T05:37:22 * Elevation: 1945.0 m * Location: Nepal * Campaign: FWN17 * Method/Device: Rock sample (ROCK) * Comment: Map Unit: Ranimata Fm., Lithology: quartzite
FWN17-031 * Latitude: 29.768100 * Longitude: 81.832800 * Date/Time: 2017-04-24T04:29:09 * Elevation: 3698.0 m * Location: Nepal * Campaign: FWN17 * Method/Device: Rock sample (ROCK) * Comment: Map Unit: Kushma Fm., Lithology: quartzite
FWN17-042 * Latitude: 29.707200 * Longitude: 81.832000 * Date/Time: 2017-04-25T03:19:41 * Elevation: 1933.0 m * Location: Nepal * Campaign: FWN17 * Method/Device: Rock sample (ROCK) * Comment: Map Unit: Ranimata 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 | Date/Time of event | Date/Time | Braza, Mary | |||
| 5 | Elevation of event | Elevation | m | Braza, Mary | ||
| 6 | DEPTH, sediment/rock | Depth sed | m | Braza, Mary | Geocode | |
| 7 | Sample ID | Sample ID | Braza, Mary | Grain ID | ||
| 8 | Location | Location | Braza, Mary | Map Unit | ||
| 9 | Main Lithology | Main lith | Braza, Mary | |||
| 10 | Uranium | U | ng | Braza, Mary | ||
| 11 | Thorium | Th | ng | Braza, Mary | ||
| 12 | Uranium/Thorium ratio | U/Th | Braza, Mary | According to Reiners (2005) and Reiners et al. (2004) | ||
| 13 | Age, mineral | Age mineral | Ma | Braza, Mary | Raw age | |
| 14 | Age, mineral, standard deviation | Age mineral std dev | ± | Braza, Mary | 1sigma | |
| 15 | alpha-ejection correction | Ft | Braza, Mary | According to Reiners (2005) and Reiners et al. (2004) | Ft 238U | |
| 16 | alpha-ejection correction | Ft | Braza, Mary | According to Reiners (2005) and Reiners et al. (2004) | Ft 235U | |
| 17 | alpha-ejection correction | Ft | Braza, Mary | According to Reiners (2005) and Reiners et al. (2004) | Ft 232U | |
| 18 | alpha-ejection correction | Ft | Braza, Mary | According to Reiners (2005) and Reiners et al. (2004) | Ft 147Sm | |
| 19 | Size | Size | µm | Braza, Mary | Rs: width of the rims around the crystals | |
| 20 | Age, mineral | Age mineral | Ma | Braza, Mary | Corrected age | |
| 21 | Age, mineral, standard deviation | Age mineral std dev | ± | Braza, Mary | 1sigma | |
| 22 | Mass | Mass | g | Braza, Mary | ||
| 23 | Uranium | U | mg/kg | Braza, Mary | According to Reiners (2005) and Reiners et al. (2004) | ppm U (Zr) |
| 24 | Thorium | Th | mg/kg | Braza, Mary | According to Reiners (2005) and Reiners et al. (2004) | ppm Th (Zr) |
| 25 | Helium-4 | 4He | nmol/kg | Braza, Mary | According to Reiners (2005) and Reiners et al. (2004) | |
| 26 | Uranium | U | mg/kg | Braza, Mary | According to Reiners (2005) and Reiners et al. (2004) | ppm eU (Zr) |
| 27 | Ratio | Ratio | Braza, Mary | According to Reiners (2005) and Reiners et al. (2004) | eU (morph)/eU (Zr) | |
| 28 | AGE | Age | ka BP | Braza, Mary | Calculated | Geocode – Mean age, calculated from three zircon grains. |
| 29 | Age, minimum/young, error | Age min e | ± | Braza, Mary | Calculated | Error spans the range in measured ages and includes a 2σ analytical error. |
| 30 | Age, maximum/old, error | Age max e | ± | Braza, Mary | Calculated | Error spans the range in measured ages and includes a 2σ analytical error. |
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0) (License comes into effect after moratorium ends)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
883 data points