Citation:

PANGAEA.957457

Name: 230Th dating results analyzed at the University of Minnesota (Dataset S1)
Published: 2023-04-21
License: https://creativecommons.org/licenses/by/4.0/
Keywords: d13C; d18O; South Africa; Stable carbon and oxygen isotopes; U-series dating; U-Th dating

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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):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event		Braun, Kerstin
2	Sample code/label	Sample label		Braun, Kerstin
3	DISTANCE	Distance	cm	Braun, Kerstin		Geocode
4	Uranium-238	238U	µg/kg	Braun, Kerstin		original given in ppb
5	Uranium-238, standard deviation	238U std dev	±	Braun, Kerstin
6	Thorium-232	232Th	ng/kg	Braun, Kerstin		original given in ppt
7	Thorium-232, standard deviation	232Th std dev	±	Braun, Kerstin
8	Thorium-230/Thorium-232 atomic ratio	230Th/232Th atom		Braun, Kerstin
9	Thorium-230/Thorium-232 atomic ratio, standard deviation	230Th/232Th atom std dev	±	Braun, Kerstin		2σ
10	δ234 Uranium	δ234U	‰	Braun, Kerstin	Measured	, d234U
11	δ234 Uranium, standard deviation	δ234U std dev	±	Braun, Kerstin		2σ
12	Thorium-230/Uranium-238 activity ratio	(230Th/238U)		Braun, Kerstin
13	Thorium-230/Uranium-238 activity ratio, standard deviation	(230Th/238U) std dev	±	Braun, Kerstin		2σ
14	Age, dated	Age dated	ka	Braun, Kerstin	Age, 230Thorium, uncorrected
15	Age, dated, standard deviation	Age dated std dev	±	Braun, Kerstin	Age, 230Thorium, uncorrected	2σ
16	Age, dated	Age dated	ka	Braun, Kerstin	Age, 230Thorium, corrected
17	Age, dated, standard deviation	Age dated std dev	±	Braun, Kerstin	Age, 230Thorium, corrected	2σ
18	δ234 Uranium (0)	δ234U (0)	‰	Braun, Kerstin	Corrected	Uinitial
19	δ234 Uranium (0), standard deviation	δ234U (0) std dev	±	Braun, Kerstin	Corrected	2σ
20	Age, dated	Age dated	ka	Braun, Kerstin	Age, 230Thorium, corrected	***
21	Age, dated, standard deviation	Age dated std dev	±	Braun, Kerstin	Age, 230Thorium, corrected	2σ

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

467 data points

Data

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

1 Event	2 Sample label	3 Distance [cm]	4 238U [µg/kg] (original given in ppb)	5 238U std dev [±]	6 232Th [ng/kg] (original given in ppt)	7 232Th std dev [±]	8 230Th/232Th atom	9 230Th/232Th atom std dev [±] (2σ)	10 δ234U [‰] (, d234U, Measured)	11 δ234U std dev [±] (2σ)	12 (230Th/238U)	13 (230Th/238U) std dev [±] (2σ)	14 Age dated [ka] (Age, 230Thorium, uncorrected)	15 Age dated std dev [±] (2σ, Age, 230Thorium, uncorrected)	16 Age dated [ka] (Age, 230Thorium, corrected)	17 Age dated std dev [±] (2σ, Age, 230Thorium, corrected)	18 δ234U (0) [‰] (Uinitial, Corrected)	19 δ234U (0) std dev [±] (2σ, Corrected)	20 Age dated [ka] (***, Age, 230Thorium, corrected)	21 Age dated std dev [±] (2σ, Age, 230Thorium, corrected)
CLC1_138857	138857-D1.2	28.50	100.1	0.1	80	2	0.070999	0.001525	1946.7	2.3	3.4580	0.0042	346.190	2.179	346.185	2.179	5171	32	346.115	2.179
CLC1_138857	138857-E1.2	34.10	129.7	0.1	91	2	0.043022	0.001141	628.5	1.7	1.8306	0.0026	432.423	6.237	432.413	6.237	2130	38	432.343	6.237
CLC1_138857	138857-E4	36.40	132.7	0.1	124	3	0.044673	0.000923	1149.1	2.0	2.5337	0.0030	431.740	4.723	431.732	4.723	3886	52	431.662	4.723
CLC1_138857	138857-E5	38.50	129.4	0.1	103	2	0.053383	0.001120	1195.6	1.9	2.5817	0.0028	415.769	3.852	415.762	3.852	3865	42	415.692	3.852
CLC1_138858	138858-C2	2.30	137.5	0.1	141	3	0.039488	0.000860	1092.7	2.1	2.4488	0.0032	421.533	4.859	421.524	4.859	3590	50	421.454	4.859
CLC1_138858	138858-D1	5.05	111.5	0.1	68	1	0.042343	0.000918	407.1	1.5	1.5743	0.0025	631.540	34.093	631.519	34.090	2419	235	631.449	34.090
CLC1_138858	138858-D3	6.00	96.5	0.1	91	2	0.026415	0.000558	362.8	1.4	1.5124	0.0025	640.841	39.399	640.816	39.395	2214	250	640.746	39.395
CLC1_142835	142835-E2	14.00	123.3	0.1	439	9	0.008646	0.000174	702.2	1.6	1.8653	0.0022	351.185	2.855	351.148	2.855	1892	16	351.078	2.855
CLC1_142835	142835-E1	14.50	71.6	0.0	346	7	0.005045	0.000102	345.6	1.3	1.4805	0.0017	570.832	18.969	570.770	18.962	1730	93	570.700	18.962
CLC1_142835	142835-top2	15.70	84.8	0.1	751	15	0.002700	0.000054	312.1	1.4	1.4511	0.0022
CLC1_142839	142839-C1	3.25	79.3	0.1	540	11	0.004329	0.000087	600.6	1.6	1.7886	0.0022	424.446	5.431	424.377	5.428	1989	31	424.307	5.428
CLC1_142839	142839-D1	4.20	70.4	0.1	117	2	0.017521	0.000358	570.5	1.7	1.7622	0.0020	453.496	6.900	453.476	6.899	2051	40	453.406	6.899
CLC1_142839	142839-E1	5.15	94.2	0.1	89	3	0.031183	0.000969	589.3	1.6	1.7911	0.0030	461.090	8.812	461.078	8.812	2165	54	461.008	8.812
CLC1_142839	142839-F2	6.40	89.2	0.1	45	1	0.058400	0.001403	586.4	1.5	1.7941	0.0021	478.809	7.968	478.800	7.967	2265	51	478.730	7.967
CLC1_142842	142842-19	12.85	90.6	0.1	266	6	0.022723	0.000489	2535.6	2.9	4.0442	0.0053	297.710	1.563	297.696	1.563	5874	27	297.626	1.563
CLC1_142842	142842-20	14.50	97.1	0.1	245	5	0.020967	0.000424	1718.0	2.1	3.2148	0.0052	372.021	3.282	372.007	3.282	4909	46	371.937	3.282
CLC1_142842	142842-21	15.80	165.0	0.2	130	3	0.048916	0.001010	1003.5	1.8	2.3376	0.0040	432.563	6.171	432.555	6.172	3401	60	432.485	6.172
CLC1_142842	142842-22	20.20	169.0	0.2	128	3	0.050915	0.001051	998.0	1.8	2.3378	0.0040	442.977	6.615	442.969	6.615	3484	65	442.899	6.615
CLC1_142842	142842-23	26.95	109.5	0.2	206	4	0.022013	0.000447	1122.7	1.8	2.5156	0.0043	454.326	6.844	454.312	6.845	4046	78	454.242	6.845
CLC1_142842	142842-24	32.60	134.8	0.2	160	3	0.033112	0.000677	1062.1	1.9	2.3803	0.0039	392.854	4.413	392.844	4.413	3218	41	392.774	4.413
CLC1_142842	142842-25	36.80	111.6	0.1	204	4	0.023496	0.000477	1169.4	2.0	2.6010	0.0042	487.137	8.407	487.124	8.407	4623	110	487.054	8.407
CLC1_142842	142842-26	37.40	100.2	0.1	136	3	0.029772	0.000615	1047.8	2.0	2.4588	0.0042	543.733	13.817	543.720	13.818	4860	190	543.650	13.818
CLC1_142842	142842-27	38.25	154.9	0.2	115	2	0.047060	0.000975	785.9	1.6	2.1114	0.0035	630.597	26.104	630.582	26.103	4658	345	630.512	26.103
CLC1_142842	142842-28	40.95	115.3	0.1	141	3	0.029973	0.000614	863.6	1.6	2.2245	0.0035	648.124	27.792	648.105	27.790	5378	425	648.035	27.790
CLC1_142842	142842-29	44.50	112.0	0.1	164	4	0.021837	0.000489	662.5	1.9	1.9426	0.0030	684.229	42.422	684.203	42.419	4568	555	684.133	42.419