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Utida, Giselle; Cruz, Francisco William; Santos, Roberto Ventura; Sawakuchi, André Oliveira; Wang, Hong; Pessenda, Luiz C R; Novello, Valdir Felipe; Vuille, Mathias; Strauss, André M; Borella, Ana Claudia; Stríkis, Nicolás Misailidis; Guedes, Carlos C; De Andrade, Fábio Ramos Dias; Zhang, Haiwei; Cheng, Hai; Edwards, R Lawrence (2021): U/Th results of TRA 7 speleothem [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.928029, In: Utida, G et al. (2021): δ¹³C and ⁸⁷Sr/⁸⁶Sr stalagmite records from Northeastern Brazil [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.928049

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Keyword(s):
carbon and strontium isotopes; LGM; Meghalayan Age; Speleothems
Related to:
Utida, Giselle; Cruz, Francisco William; Santos, Roberto Ventura; Sawakuchi, André Oliveira; Wang, Hong; Pessenda, Luiz C R; Novello, Valdir Felipe; Vuille, Mathias; Strauss, André M; Borella, Ana Claudia; Stríkis, Nicolás Misailidis; Guedes, Carlos C; De Andrade, Fábio Ramos Dias; Zhang, Haiwei; Cheng, Hai; Edwards, R Lawrence (2020): Climate changes in Northeastern Brazil from deglacial to Meghalayan periods and related environmental impacts. Quaternary Science Reviews, 250, 106655, https://doi.org/10.1016/j.quascirev.2020.106655
Coverage:
Latitude: -5.596756 * Longitude: -37.697500
Event(s):
Felipe_Guerra * Latitude: -5.596756 * Longitude: -37.697500 * Method/Device: Speleothem sample (SPS) * Comment: Trapiá, Rainha, Abissal caves
Comment:
U decay constants: λ238 = 1.55125x10-10 (Jaffey et al., 1971) and λ234 = 2.82206x10-6 (Cheng et al., 2013).
Th decay constant: λ230 = 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 eλ234xT. 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
1Sample code/labelSample labelUtida, Giselle
2DistanceDistmmUtida, Giselle
3Uranium-238238Ung/gUtida, Giselle
4Uranium-238, standard deviation238U std dev±Utida, Giselle
5Thorium-232232Thpg/gUtida, Giselle
6Thorium-232, standard deviation232Th std dev±Utida, Giselle
7Thorium-230/Thorium-232 atomic ratio230Th/232Th atomUtida, Gisellex10-6
8Thorium-230/Thorium-232 atomic ratio, standard deviation230Th/232Th atom std dev±Utida, Giselle
9δ234 Uraniumδ234U‰Utida, Giselle*
10δ234 Uranium, standard deviationδ234U std dev±Utida, Giselle
11Thorium-230/Uranium-238 activity ratio(230Th/238U)Utida, Giselle
12Thorium-230/Uranium-238 activity ratio, standard deviation(230Th/238U) std dev±Utida, Giselle
13Age, datedAge datedkaUtida, GiselleAge, 230Thoriumuncorrected
14Age, dated standard deviationAge dated std dev±Utida, Giselleuncorrected
15Age, datedAge datedkaUtida, GiselleAge, 230Thoriumcorrected
16Age, dated standard deviationAge dated std dev±Utida, Gisellecorrected
17δ234 Uraniumδ234U‰Utida, Giselle**
18δ234 Uranium, standard deviationδ234U std dev±Utida, Giselle
19Age, datedAge datedkaUtida, GiselleAge, 230Thoriumcorrected
20Age, dated standard deviationAge dated std dev±Utida, Gisellecorrected
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Size:
540 data points

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