Citation:

012015

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Abstract:

We present 22 U-series ages for a stalagmite from north-western Cuba based on multi-collector inductively coupled plasma mass spectrometry (MC-ICPMS) and thermal ionisation mass spectrometry (TIMS). Our results reveal that the stalagmite continuously grew within the last ~1400a. Low uranium content of the sample and thus, extremely low 230Th concentrations limit the precision and accuracy of 230Th/U-dating by TIMS. Samples measured by MC-ICPMS show a high variability of 232Th content along the growth axis with some sections significantly affected by initial 230Th from a detrital phase. An a-priori bulk earth ratio for (238U/232Th) cannot be used to accurately account for this initial 230Th. Using an age model based on the 230Th/U ages determined on samples with low or negligible 232Th concentration, we find that the (238U/232Th) activity ratio of the detrital phase is an order of magnitude larger than the bulk earth value, indicating the importance of an accurately determined correction factor.

Project(s):

Integrierte Analyse zwischeneiszeitlicher Klimadynamik (INTERDYNAMIK)

Funding:

German Research Foundation (DFG), grant/award no. 25575884 : Integrierte Analyse zwischeneiszeitlicher Klimadynamik

Coverage:

Latitude: 22.383300 * Longitude: -83.966700

Minimum DISTANCE: 1.30 cm * Maximum DISTANCE: 72.00 cm

Event(s):

Cuba_Grande (CG) * Latitude: 22.383300 * Longitude: -83.966700 * Elevation: 100.0 m * Location: Pinar del Rio (NW Cuba) * Method/Device: Speleothem sample (SPS) * Comment: Dos Anas Cave, Majaguas Cantera

Comment:

Data acquired through subproject CaribClim (Control of seasonality and interannual to centennial climate in the Caribbean during the Holocene - Combining coral records, stalagmite records and climate models)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	DISTANCE	Distance	cm			Geocode
2	Uranium-238	238U	mg/kg	Fensterer, Claudia	Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS)
3	Uranium-238, standard deviation	238U std dev	±	Fensterer, Claudia	Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS)
4	Thorium-232	232Th	mg/kg	Fensterer, Claudia	Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS)
5	Thorium-232, standard deviation	232Th std dev	±	Fensterer, Claudia	Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS)
6	Thorium-230/Thorium-232 activity ratio	(230Th/232Th)		Fensterer, Claudia	Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS)
7	Thorium-230/Thorium-232 activity ratio, standard deviation	(230Th/232Th) std dev	±	Fensterer, Claudia	Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS)
8	Thorium-230/Uranium-238 ratio	230Th/238U		Fensterer, Claudia	Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS)	activity ratio
9	Thorium-230/Uranium-238 activity ratio, standard deviation	(230Th/238U) std dev	±	Fensterer, Claudia	Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS)
10	Uranium-234/Uranium-238 activity ratio	(234U/238U)		Fensterer, Claudia	Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS)
11	Uranium-234, standard deviation	234U std dev	±	Fensterer, Claudia	Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS)	activity ratio
12	Age, dated	Age dated	ka	Fensterer, Claudia	Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS)	Age uncorrected [ka b2k]
13	Age, dated standard deviation	Age dated std dev	±	Fensterer, Claudia	Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS)
14	Age, dated	Age dated	ka	Fensterer, Claudia	Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS)	Age corrected with (238U/232Th)=0.8+-0.2 [ka b2k]
15	Age, dated standard deviation	Age dated std dev	±	Fensterer, Claudia	Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS)
16	Age, dated	Age dated	ka	Fensterer, Claudia	Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS)	Age corrected with (238U/232Th)=8+-4 [ka b2k]
17	Age, dated standard deviation	Age dated std dev	±	Fensterer, Claudia	Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS)
18	Age, comment	Comm		Fensterer, Claudia	Multi-collector inductively coupled plasma mass spectrometer (MC-ICP-MS)

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

351 data points

Data

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

1 Distance [cm]	2 238U [mg/kg]	3 238U std dev [±]	4 232Th [mg/kg]	5 232Th std dev [±]	6 (230Th/232Th)	7 (230Th/232Th) std dev [±]	8 230Th/238U (activity ratio)	9 (230Th/238U) std dev [±]	10 (234U/238U)	11 234U std dev [±] (activity ratio)	12 Age dated [ka] (Age uncorrected [ka b2k])	13 Age dated std dev [±]	14 Age dated [ka] (Age corrected with (238U/232T...)	15 Age dated std dev [±]	16 Age dated [ka] (Age corrected with (238U/232T...)	17 Age dated std dev [±]	18 Comm
1.30	0.1352	0.0005	0.00073930	0.00000210	6.50	0.05	0.01160	0.00010	2.345	0.004	0.534	0.005	0.467	0.034			[0; 0.110]
2.70	0.1355	0.0005	0.00018150	0.00000140	11.56	0.10	0.00507	0.00004	2.342	0.004	0.227	0.002	0.211	0.008	0.067		0.067 +0.070 -0.067
13.50	0.1362	0.0005	0.00003180	0.00000040	79.81	1.24	0.00610	0.00010	2.361	0.004	0.273	0.004	0.270	0.004	0.246	0.015
21.50	0.1241	0.0004	0.00003850	0.00000030	93.57	1.08	0.00950	0.00010	2.360	0.004	0.431	0.005	0.427	0.005	0.394	0.019
34.00	0.1048	0.0004	0.00003520	0.00000060	127.18	3.41	0.01399	0.00031	2.363	0.004	0.639	0.015	0.635	0.015	0.599	0.024
39.50	0.1344	0.0005	0.00003430	0.00000030	198.40	1.86	0.01656	0.00014	2.360	0.004	0.759	0.007	0.756	0.007	0.729	0.017
54.00	0.0914	0.0003	0.00013670	0.00000160	54.71	0.67	0.02676	0.00023	2.347	0.004	1.242	0.011	1.224	0.014	1.064	0.089
59.50	0.0906	0.0003	0.00001470	0.00000010	438.97	3.46	0.02328	0.00016	2.302	0.004	1.100	0.008	1.098	0.008	1.080	0.013
66.50	0.0991	0.0004	0.00002850	0.00000030	271.78	2.63	0.02554	0.00023	2.266	0.004	1.227	0.011	1.224	0.011	1.192	0.022
71.20	0.1014	0.0003	0.00001940	0.00000020	438.07	5.93	0.02750	0.00030	2.247	0.004	1.332	0.015	1.330	0.015	1.309	0.021
4.00	0.1993	0.0004	0.00031650	0.00000570	9.60	0.90	0.00500	0.00050	2.349	0.007	0.227	0.022	0.208	0.022	0.038		0.038 +0.07 -0.38
8.00	0.1847	0.0004	0.00005780	0.00000174	44.00	6.70	0.00450	0.00070	2.340	0.008	0.204	0.031	0.201	0.031	0.167	0.032
11.80	0.1543	0.0003	0.00000580	0.00000006	301.20	24.90	0.00380	0.00030	2.342	0.007	0.169	0.015	0.169	0.015	0.165	0.015
17.90	0.1267	0.0003	0.00005350	0.00000080	74.10	5.90	0.01030	0.00080	2.335	0.007	0.475	0.038	0.470	0.038	0.424	0.042
26.00	0.1362	0.0003	0.00001050	0.00000008	574.40	21.10	0.01460	0.00050	2.378	0.007	0.666	0.025	0.665	0.025	0.657	0.025
30.50	0.1423	0.0003	0.00004310	0.00000074	132.90	5.50	0.01320	0.00050	2.402	0.007	0.595	0.022	0.591	0.023	0.559	0.029
37.65	0.1475	0.0002	0.00002320	0.00000034	297.80	24.50	0.01540	0.00120	2.341	0.008	0.713	0.059	0.711	0.058	0.694	0.058
47.00	0.1318	0.0001	0.00000820	0.00000009	1147.50	59.90	0.02350	0.00120	2.339	0.004	1.194	0.057	1.194	0.056	1.087	0.057
52.00	0.1309	0.0003	0.00006290	0.00000063	150.00	9.30	0.02360	0.00140	2.348	0.007	1.096	0.067	1.091	0.068	1.039	0.069
61.60	0.1216	0.0002	0.00013230	0.00000225	85.50	4.30	0.03050	0.00140	2.285	0.008	1.458	0.070	1.444	0.070	1.325	0.091
65.00	0.1212	0.0002	0.00001477	0.00000014	655.30	45.60	0.02610	0.00180	2.259	0.008	1.262	0.090	1.260	0.088	1.247	0.087
72.00	0.1162	0.0002	0.00006888	0.00000103	164.80	10.00	0.03200	0.00190	2.253	0.008	1.552	0.091	1.545	0.095	1.479	0.096