Thorium, Uranium and Lead isotopic and geochronologic data for zircon crystals following LA-ICP-MS analysis


Individial CA-TIMS ages of analyses in red were excluded from the final age calculation.(a) z1, z2 etc. are labels for single zircon grains or fragments annealed and chemically abraded after Mattinson (2005; doi:10.1016/j.chemgeo.2005.03.011). Data marked in red were not used for final 206Pb/238U date calculations.(b) Model Th/U ratio iteratively calculated from the radiogenic 208Pb/206Pb ratio and 206Pb/238U age.(c) Pb and Pbc represent radiogenic and common Pb, respectively; mol % 206Pb with respect to radiogenic, blank and initial common Pb.(d) Measured ratio corrected for spike and fractionation only. Fractionation estimated at 0.17 +/- 0.03 %/a.m.u. for Daly analyses, based on analysis of NBS-981 and NBS-982.(e) Corrected for fractionation, spike, and common Pb; all common Pb was assumed to be procedural blank: 206Pb/204Pb = 18.042 ± 0.61%; 207Pb/204Pb = 15.537 ± 0.52%; 208Pb/204Pb = 37.686 ± 0.63% (all uncertainties 1-sigma). (f) Errors are 2-sigma, propagated using the algorithms of Schmitz and Schoene (2007; doi:10.1029/2006GC001492).(g) Calculations are based on the decay constants of Jaffey et al. (1971; doi:10.1103/PhysRevC.4.1889). 206Pb/238U and 207Pb/206Pb ages corrected for initial disequilibrium in 230Th/238U using Th/U [magma] = 3.

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Creator Thines, Jennifer E (ORCID: 0000-0001-9589-960X); Ukstins, Ingrid Anne; Wall, Corey; Schmitz, Mark D ORCID logo
Publisher PANGAEA
Publication Year 2021
Funding Reference Geological Society of London Crossref Funder ID NSF EAR-1759200 AGeS2 Geochronology Program; Geological Society of London Crossref Funder ID NSF EAR-1759353 AGeS2 Geochronology Program
Rights Creative Commons Attribution 4.0 International;
OpenAccess true
Language English
Resource Type Dataset
Format text/tab-separated-values
Size 772 data points
Discipline Earth System Research
Spatial Coverage (43.945W, 15.160S, 44.417E, 15.480N); Northern Yemen