Orrison, Rebecca; Vuille, Mathias; Smerdon, Jason E; Apaéstegui, James; Azevedo, Vitor; Campos, Jose Leandro P S; Cruz, Francisco William; Della Libera, Marcela Eduarda; Stríkis, Nicolás Misailidis (2022): Last Millennium U/Th ages of MV30 stalagmite record from Mata Virgem cave [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.948182, In: Orrison, R et al. (2022): Last Millennium δ¹⁸O, δ¹³C, and U/Th ages of MV1 and MV30 stalagmite records from Mata Virgem cave (central Brazil) [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.948183
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Abstract:
Presented here are U-Th ages derived from the MV30 stalagmite. This sample was collected from Mata Virgem cave (11°37′27.07′′S, 47°29′19.04′′W) in the eastern region of the Brazilian tropical Savannah known as 'Cerrado'. 13 age ties have been calculated, including one that is an outlier (depth = 14 cm).
Related to:
Orrison, Rebecca; Vuille, Mathias; Smerdon, Jason E; Apaéstegui, James; Azevedo, Vitor; Campos, Jose Leandro P S; Cruz, Francisco William; Della Libera, Marcela Eduarda; Stríkis, Nicolás Misailidis (2022): South American Summer Monsoon variability over the last millennium in paleoclimate records and isotope-enabled climate models. Climate of the Past, 18(9), 2045-2062, https://doi.org/10.5194/cp-18-2045-2022
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:
National Science Foundation (NSF), grant/award no. 1743738: PIRE: Climate Research Education in the Americas Using Tree-Ring and Cave Sediment Examples (PIRE-CREATE)
Coverage:
Latitude: -11.624190 * Longitude: -47.488620
Minimum DISTANCE: 0.2 cm * Maximum DISTANCE: 17.2 cm
Event(s):
Comment:
• Note that only the upper and lower sections of the sample have stable isotope data available. Data without errors represent averaged values from above and below samples to preserve the stable isotope curve tendancy.
• The errors represent 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):
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:
259 data points