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Wilcox, Paul S; Mudelsee, Manfred; Spötl, Christoph; Edwards, R Lawrence (2022): Thorium-230 dating of speleothems WB-21-5-A and WA-21-6-A [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.949766, In: Wilcox, PS et al. (2022): WA-21-6-A and WB-21-5-A speleothem geochemistry [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.949778

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Published: 2022-10-18 • DOI registered: 2022-11-16

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Abstract:
The dataset includes speleothem U-Th ages used to reconstruct climate in southeastern Alaska during the past ~3,500 years. Speleothem WB-21-5-A was collected in Wishbone Cave (55.774 N, -133.191 E; 420 m.a.s.l.) and speleothem WA-21-6-A was collected in Walkabout Cave (55.776° N, 133.195° W; 350 m.a.s.l.) on May 21, 2022 and June 21, 2022, respectfully. The data collection was completed between September 2021-March 2022. U-Th ages were measured on a ThermoFisher Neptune Plus multi-collector inductively coupled plasma mass spectrometer.
Keyword(s):
Alaska; climate change; El Nino Southern Oscillation; Paleoclimate; speleothem
Further details:
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
Jaffey, A H; Flynn, K F; Glendenin, L E; Bentley, W C; Essling, A M (1971): Precision measurement of half-lives and specific activities of 235U and 238U. Physical Review C, 4(5), 1889-1906, https://doi.org/10.1103/PhysRevC.4.1889
Funding:
Austrian Science Fund (FWF), grant/award no. P 33896: A new approach to Holocene climate in Alaska
Coverage:
Median Latitude: 55.775000 * Median Longitude: -133.193000 * South-bound Latitude: 55.774000 * West-bound Longitude: -133.195000 * North-bound Latitude: 55.776000 * East-bound Longitude: -133.191000
Date/Time Start: 2022-05-21T00:00:00 * Date/Time End: 2022-06-21T00:00:00
Minimum DISTANCE: 0.50 cm * Maximum DISTANCE: 53.60 cm
Event(s):
WA-21-6-A (Walkabout Cave)  * Latitude: 55.776000 * Longitude: -133.195000 * Date/Time: 2022-06-21T00:00:00 * Elevation: 350.0 m * Method/Device: Speleothem sample (SPS)
WB-21-5-A (Wishbone Cave)  * Latitude: 55.774000 * Longitude: -133.191000 * Date/Time: 2022-05-21T00:00:00 * Elevation: 420.0 m * Method/Device: Speleothem sample (SPS)
Comment:
U decay constants: l238 = 1.55125x10-10 (Jaffey et al., 1971) and l234 = 2.82206x10-6 (Cheng et al., 2013).
Th decay constant: l230 = 9.1705x10-6 (Cheng et al., 2013).
* d234U = ([234U/238U]activity – 1)x1000
d234Uinitial was calculated based on 230Th age (T), i.e., d234Uinitial = d234Umeasured x el234xT.
** Corrected 230Th ages assume the initial 230Th/232Th atomic ratio of 4.4 ±2.2 x10-6. Those are the values for a material at secular equilibrium, with the bulk earth 232Th/238U value of 3.8. The errors are arbitrarily assumed to be 50%.
*** B.P. stands for “Before Present” where the “Present” is defined as the year 1950 CE.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1 Event labelEventWilcox, Paul S
2 DISTANCEDistancecmWilcox, Paul SGeocode
3 Uranium-238238Uµg/kgWilcox, Paul SMC-ICP-MS (Thermo Scientific, Neptune)ppb
4 Uranium-238, standard deviation238U std dev±Wilcox, Paul SMC-ICP-MS (Thermo Scientific, Neptune)2 sigma
5 Thorium-232232Thng/kgWilcox, Paul SMC-ICP-MS (Thermo Scientific, Neptune)ppt
6 Thorium-232, standard deviation232Th std dev±Wilcox, Paul SMC-ICP-MS (Thermo Scientific, Neptune)2 sigma
7 Thorium-230/Thorium-232 ratio230Th/232ThWilcox, Paul SMC-ICP-MS (Thermo Scientific, Neptune)
8 Thorium-230/Thorium-232 ratio, standard deviation230Th/232Th std dev±Wilcox, Paul SMC-ICP-MS (Thermo Scientific, Neptune)2 sigma
9 δ234 Uraniumδ234U‰Wilcox, Paul SMeasured*
10 δ234 Uranium, standard deviationδ234U std dev±Wilcox, Paul SMeasured2 sigma
11 Thorium-230/Uranium-238 activity ratio(230Th/238U)Wilcox, Paul SMC-ICP-MS (Thermo Scientific, Neptune)
12 Thorium-230/Uranium-238 activity ratio, standard deviation(230Th/238U) std dev±Wilcox, Paul SMC-ICP-MS (Thermo Scientific, Neptune)2 sigma
13 Age, datedAge datedkaWilcox, Paul SAge, 230Thorium, uncorrected
14 Age, dated, standard deviationAge dated std dev±Wilcox, Paul SAge, 230Thorium, uncorrected2 sigma
15 Age, datedAge datedkaWilcox, Paul SAge, 230Thorium, corrected
16 Age, dated, standard deviationAge dated std dev±Wilcox, Paul SAge, 230Thorium, corrected2 sigma
17 δ234 Uranium (0)δ234U (0)‰Wilcox, Paul SCorrected**
18 δ234 Uranium (0), standard deviationδ234U (0) std dev±Wilcox, Paul SCorrected2 sigma
19 AGEAgeka BPWilcox, Paul SCorrectedGeocode – ***
20 Age, standard deviationAge std dev±Wilcox, Paul SCorrected2 sigma
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:
170 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 
Event		2 
Distance [cm]		3 
238U [µg/kg]
(ppb, MC-ICP-MS (Thermo Scient...)		4 
238U std dev [±]
(2 sigma, MC-ICP-MS (Thermo Sc...)		5 
232Th [ng/kg]
(ppt, MC-ICP-MS (Thermo Scient...)		6 
232Th std dev [±]
(2 sigma, MC-ICP-MS (Thermo Sc...)		7 
230Th/232Th
(MC-ICP-MS (Thermo Scientific,...)		8 
230Th/232Th std dev [±]
(2 sigma, MC-ICP-MS (Thermo Sc...)		9 
δ234U [‰]
(*, Measured)		10 
δ234U std dev [±]
(2 sigma, Measured)		11 
(230Th/238U)
(MC-ICP-MS (Thermo Scientific,...)		12 
(230Th/238U) std dev [±]
(2 sigma, MC-ICP-MS (Thermo Sc...)		13 
Age dated [ka]
(Age, 230Thorium, uncorrected)		14 
Age dated std dev [±]
(2 sigma, Age, 230Thorium, unc...)		15 
Age dated [ka]
(Age, 230Thorium, corrected)		16 
Age dated std dev [±]
(2 sigma, Age, 230Thorium, cor...)		17 
δ234U (0) [‰]
(**, Corrected)		18 
δ234U (0) std dev [±]
(2 sigma, Corrected)		19 
Age [ka BP]
(***, Corrected)		20 
Age std dev [±]
(2 sigma, Corrected)
WA-21-6-A 18.15-0.071
WA-21-6-A17.00177.90.321194329E-62E-61562.63.70.02120.00110.9070.0480.8940.049156740.8270.049
WA-21-6-A12.00176.20.320504163E-62E-61410.73.40.04460.00112.0340.0421.8890.103141831.8220.103
WA-21-6-A9.00276.00.6258152112E-63E-61702.94.40.06370.00112.5950.0472.4940.085171542.4270.085
WA-21-6-A3.50172.40.3136028166E-65E-61483.13.40.07930.00173.5270.0763.5180.076149833.4510.076
WA-21-6-A0.50258.00.6213543200E-65E-61656.04.90.10030.00124.1830.0504.0930.081167554.0260.081
WB-21-5-A 53.60
WB-21-5-A43.50220.90.43217133E-612E-6827.42.70.01170.00100.7000.0600.6760.06282930.6090.062
WB-21-5-A30.00236.50.455512188E-611E-6785.62.70.02670.00141.6430.0881.6050.09278931.5380.092
WB-21-5-A21.00261.80.456512272E-612E-6778.72.80.03550.00142.1980.0892.1630.09378332.0960.093
WB-21-5-A5.50214.30.451310356E-69E-6839.03.10.05170.00083.1030.0503.0650.05684632.9980.056
WB-21-5-A0.50329.40.6236548140E-64E-6862.63.00.06090.00123.6160.0733.5040.10887133.4370.108