Lu, Yang; Hu, Hsun-Ming; Shen, Chuan-Chou: Uranium and thorium isotopic compositions of seep carbonate samples, Dre1, Dre2 and Dre3 [dataset]. PANGAEA, https://doi.pangaea.de/10.1594/PANGAEA.971673 (dataset in review)
Abstract:
To obtain the uranium-thorium ages of seep carbonates, selected samples were sent to the National Taiwan University. Powder samples were drilled on a class-100 bench in a class-10,000 clean room and then processed in the way following Shen et al. (2003) and (2012). Results were measured with a Thermo-Finnigan Neptune multi-collector inductively coupled plasma mass spectrometer and calibrated by triple-spike (²²⁹Th-²³³U-²³⁶U). The half-lives used for U-Th age calculation are from Cheng et al. (2013).
Supplement to:
Lu, Yang; Paulmann, Carsten; Hu, Hsun-Ming; Yang, Yiping; Xu, Xing; Chou, Yu-Min; Shen, Chuan-Chou; Lin, Zhiyong; Peckmann, Jörn; Liu, Qingsong (in prep.): Sulphidic conditions promote dolomite formation at methane seeps within hundreds of thousand years.
References:
Cheng, Hai; Edwards, R Lawrence; Shen, Chuan-Chou; Polyak, Victor J; Asmerom, Yemane; Woodhead, Jon D; Hellstrom, John C; Wang, Yongjin; Kong, Xinggong; Spötl, Christoph; Wang, Xianfeng; Alexander, E Calvin (2013): Improvements in 230Th dating, 230Th and 234U half-life values, and U–Th isotopic measurements by multi-collector inductively coupled plasma mass spectrometry. Earth and Planetary Science Letters, 371-372, 82-91, https://doi.org/10.1016/j.epsl.2013.04.006
Shen, Chuan-Chou; Cheng, Hai; Edwards, R Lawrence; Moran, S Bradley; Edmonds, H N; Hoff, J A; Thomas, Rebecca B (2003): Measurement of Attogram Quantities of 231Pa in Dissolved and Particulate Fractions of Seawater by Isotope Dilution Thermal Ionization Mass Spectroscopy. Analytical Chemistry, 75(5), 1075-1079, https://doi.org/10.1021/ac026247r
Shen, Chuan-Chou; Wu, Chung-Che; Cheng, Hai; Edwards, R Lawrence; Hsieh, Yu-Te; Gallet, Sylvain; Chang, Ching-Chih; Li, Ting-Yong; Lam, Doan Dinh; Kano, Akihiro; Hori, Masako; Spötl, Christoph (2012): High-precision and high-resolution carbonate 230Th dating by MC-ICP-MS with SEM protocols. Geochimica et Cosmochimica Acta, 99, 71-86, https://doi.org/10.1016/j.gca.2012.09.018
Funding:
Coverage:
Latitude: 20.160000 * Longitude: 115.160000
Date/Time Start: 2017-08-15T00:00:00 * Date/Time End: 2017-08-15T00:00:00
Minimum Elevation: -550.0 m * Maximum Elevation: -550.0 m
Event(s):
H07-2017_Dre1 * Latitude: 20.160000 * Longitude: 115.160000 * Date/Time: 2017-08-15T00:00:00 * Elevation: -550.0 m * Location: Shenhu, South China Sea * Campaign: H07-2017 (Methane Gas Seep Explorations in the South China Sea) * Basis: HAIYANG DIZHI SI HAO * Method/Device: Dredge (DRG)
H07-2017_Dre2 * Latitude: 20.160000 * Longitude: 115.160000 * Date/Time: 2017-08-15T00:00:00 * Elevation: -550.0 m * Location: Shenhu, South China Sea * Campaign: H07-2017 (Methane Gas Seep Explorations in the South China Sea) * Basis: HAIYANG DIZHI SI HAO * Method/Device: Dredge (DRG)
H07-2017_Dre3 * Latitude: 20.160000 * Longitude: 115.160000 * Date/Time: 2017-08-15T00:00:00 * Elevation: -550.0 m * Location: Shenhu, South China Sea * Campaign: H07-2017 (Methane Gas Seep Explorations in the South China Sea) * Basis: HAIYANG DIZHI SI HAO * Method/Device: Dredge (DRG)
Comment:
Yang Lu gratefully acknowledges the support of K. C. Wong Education Foundation and DAAD. U-Th dating was supported by grants from the National Taiwan University (NTU) Core Consortiums Project (112L894202), Higher Education Sprout Project of the Ministry of Education (112L901001).
Parameter(s):
| # | Name | Short Name | Unit | Principal Investigator | Method/Device | Comment |
|---|---|---|---|---|---|---|
| 1 | Event label | Event | ||||
| 2 | Date/Time of event | Date/Time | ||||
| 3 | Latitude of event | Latitude | ||||
| 4 | Longitude of event | Longitude | ||||
| 5 | Sample code/label | Sample label | Lu, Yang | |||
| 6 | Uranium-238 | 238U | µg/g | Lu, Yang | Calculated after Hiess et al. 2012; [238U] = [235U] × 137.818 (±0.65‰) | |
| 7 | Uranium-238, standard deviation | 238U std dev | ± | Lu, Yang | Calculated after Hiess et al. 2012; [238U] = [235U] × 137.818 (±0.65‰) | 2σ of the mean |
| 8 | Thorium-232 | 232Th | mg/kg | Lu, Yang | ||
| 9 | Thorium-232, standard deviation | 232Th std dev | ± | Lu, Yang | 2σ of the mean | |
| 10 | δ234 Uranium | δ234U | ‰ | Lu, Yang | Calculated | measured; δ234U = ([234U/238U]activity − 1) × 1000 |
| 11 | δ234 Uranium, standard deviation | δ234U std dev | ± | Lu, Yang | Calculated | 2σ of the mean |
| 12 | Thorium-230/Uranium-238 activity ratio | (230Th/238U) | Lu, Yang | Calculated | [230Th/238U]activity = 1 − e–λ230T + (δ234Umeasured/1000)[λ230/(λ230 − λ234)](1 − e–(λ230 − λ234) T), where T is the age | |
| 13 | Thorium-230/Uranium-238 activity ratio, standard deviation | (230Th/238U) std dev | ± | Lu, Yang | Calculated | 2σ of the mean |
| 14 | Thorium-230/Thorium-232 atomic ratio | 230Th/232Th atom | Lu, Yang | |||
| 15 | Thorium-230/Thorium-232 atomic ratio, standard deviation | 230Th/232Th atom std dev | ± | Lu, Yang | 2σ of the mean | |
| 16 | Calendar age | Cal age | ka BP | Lu, Yang | uncorrected | |
| 17 | Age, standard deviation | Age std dev | ± | Lu, Yang | ||
| 18 | Calendar age | Cal age | ka BP | Lu, Yang | Calculated | Age corrections, relative to AD 1950, were calculated using an estimated atomic 230Th/232Th ratio of 4 (± 2) × 10−6 |
| 19 | Age, standard deviation | Age std dev | ± | Lu, Yang | ||
| 20 | δ234 Uranium | δ234U | ‰ | Lu, Yang | Calculated | initial; δ234Uinitial corrected was calculated based on 230Th age (T), i.e., δ234Uinitial = δ234Umeasured × eλ234×T, and T is corrected age |
| 21 | δ234 Uranium, standard deviation | δ234U std dev | ± | Lu, Yang | 2σ of the mean |
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:
170 data points