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Braun, Kerstin; Cowling, Richard; Bar-Matthews, Miryam; Matthews, Alan; Ayalon, Avner; Zilberman, Tami; Difford, Mark; Edwards, R Lawrence; Li, Xianglei; Marean, Curtis W (2023): 230Th dating results analyzed at the University of Minnesota (Dataset S1) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.957432, In: Braun, K et al. (2023): Speleothem stable isotopes from 670 - 240 ka ago at Cape Limeworks Cave 1, Robertson, South Africa [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.957457

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Published: 2023-04-21 • DOI registered: 2023-05-20

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Keyword(s):
d13C; d18O; South Africa; Stable carbon and oxygen isotopes; U-series dating; U-Th dating
Related to:
Braun, Kerstin; Cowling, Richard; Bar-Matthews, Miryam; Matthews, Alan; Ayalon, Avner; Zilberman, Tami; Difford, Mark; Edwards, R Lawrence; Li, Xianglei; Marean, Curtis W (2023): Climatic stability recorded in speleothems may contribute to higher biodiversity in the Cape Floristic Region. Journal of Biogeography, jbi.14592, https://doi.org/10.1111/jbi.14592
Funding:
European Commission (EC), grant/award no. 238512: GATEWAYS
John Templeton Foundation, grant/award no. 48952
National Science Foundation (NSF), grant/award no. 2002474: National Science Foundation Grant
National Science Foundation (NSF), grant/award no. 2002486: National Science Foundation Grant
National Science Foundation (NSF), grant/award no. BCS-0524087: National Science Foundation Grant
National Science Foundation (NSF), grant/award no. BCS-1138073: National Science Foundation Grant
Coverage:
Latitude: -33.730000 * Longitude: 19.770000
Minimum DISTANCE: 2.30 cm * Maximum DISTANCE: 44.50 cm
Event(s):
CLC1_138857 (stalagmite 138857) * Latitude: -33.730000 * Longitude: 19.770000 * Elevation: 410.0 m * Location: Cape Limeworks Cave 1, Robertson, Western Cape, South Africa * Method/Device: Speleothem sample (SPS)
CLC1_138858 (stalagmite 138858) * Latitude: -33.730000 * Longitude: 19.770000 * Elevation: 410.0 m * Location: Cape Limeworks Cave 1, Robertson, Western Cape, South Africa * Method/Device: Speleothem sample (SPS)
CLC1_142835 (stalagmite 142835) * Latitude: -33.730000 * Longitude: 19.770000 * Elevation: 410.0 m * Location: Cape Limeworks Cave 1, Robertson, Western Cape, South Africa * Method/Device: Speleothem sample (SPS)
Comment:
The error is 2s error.
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 A.D.
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventBraun, Kerstin
2Sample code/labelSample labelBraun, Kerstin
3DISTANCEDistancecmBraun, KerstinGeocode
4Uranium-238238Uµg/kgBraun, Kerstinoriginal given in ppb
5Uranium-238, standard deviation238U std dev±Braun, Kerstin
6Thorium-232232Thng/kgBraun, Kerstinoriginal given in ppt
7Thorium-232, standard deviation232Th std dev±Braun, Kerstin
8Thorium-230/Thorium-232 atomic ratio230Th/232Th atomBraun, Kerstin
9Thorium-230/Thorium-232 atomic ratio, standard deviation230Th/232Th atom std dev±Braun, Kerstin2σ
10δ234 Uraniumδ234U‰Braun, KerstinMeasured*, d234U*
11δ234 Uranium, standard deviationδ234U std dev±Braun, Kerstin2σ
12Thorium-230/Uranium-238 activity ratio(230Th/238U)Braun, Kerstin
13Thorium-230/Uranium-238 activity ratio, standard deviation(230Th/238U) std dev±Braun, Kerstin2σ
14Age, datedAge datedkaBraun, KerstinAge, 230Thorium, uncorrected
15Age, dated, standard deviationAge dated std dev±Braun, KerstinAge, 230Thorium, uncorrected2σ
16Age, datedAge datedkaBraun, KerstinAge, 230Thorium, corrected
17Age, dated, standard deviationAge dated std dev±Braun, KerstinAge, 230Thorium, corrected2σ
18δ234 Uranium (0)δ234U (0)‰Braun, KerstinCorrectedUinitial
19δ234 Uranium (0), standard deviationδ234U (0) std dev±Braun, KerstinCorrected2σ
20Age, datedAge datedkaBraun, KerstinAge, 230Thorium, corrected***
21Age, dated, standard deviationAge dated std dev±Braun, KerstinAge, 230Thorium, corrected2σ
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
467 data points

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