238U/235U Systematics in Terrestrial Uranium-Bearing Minerals
作者： J. Hiess , D. J. Condon , N. McLean , S. R. Noble
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摘要: The present-day 238U/235U ratio has fundamental implications for uranium-lead geochronology and cosmochronology. A value of 137.88 previously been considered invariant used without uncertainty to calculate terrestrial mineral ages. We report high-precision measurements a suite uranium-bearing minerals from 58 samples representing diverse range lithologies. This data set exhibits in values >5 per mil, with no clear relation any petrogenetic, secular, or regional trends. Variation between comagmatic suggests that fractionation processes operate at magmatic temperatures. mean 137.818 ± 0.045 (2σ) zircon reflects the average uranium isotopic composition variability zircon. distribution is broadly representative crustal “bulk Earth” composition.
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Bruce R. Doe, Marcia F. Newell, ISOTOPIC COMPOSITION OF URANIUM IN ZIRCON American Mineralogist. ,vol. 50, pp. 613- 618 ,(1965)
Louise Corriveau, Larry M. Heaman, Franco Marcantonio, Otto van Breemen, 1.1 Ga K-rich alkaline plutonism in the SW Grenville Province Contributions to Mineralogy and Petrology. ,vol. 105, pp. 473- 485 ,(1990) , 10.1007/BF00286834
G. J. Wasserburg, R. Lawrence Edwards, J. H. Chen, 238 U, 234 U and 232 Th in seawater E&PSL. ,vol. 80, pp. 241- 251 ,(1986) , 10.1016/0012-821X(86)90108-1
Ulf Söderlund, P.Jonathan Patchett, Jeffrey D Vervoort, Clark E Isachsen, The 176Lu decay constant determined by Lu–Hf and U–Pb isotope systematics of Precambrian mafic intrusions Earth and Planetary Science Letters. ,vol. 219, pp. 311- 324 ,(2004) , 10.1016/S0012-821X(04)00012-3
J. F. Bowring, S. A. Bowring, N. M. McLean, An algorithm for U-Pb isotope dilution data reduction and uncertainty propagation Geochemistry Geophysics Geosystems. ,vol. 12, ,(2011) , 10.1029/2010GC003478
Matthew Thirlwall, Inappropriate tail corrections can cause large inaccuracy in isotope ratio determination by MC-ICP-MS Journal of Analytical Atomic Spectrometry. ,vol. 16, pp. 1121- 1125 ,(2001) , 10.1039/B103828C
A. H. Jaffey, K. F. Flynn, L. E. Glendenin, W. C. Bentley, A. M. Essling, Precision Measurement of Half-Lives and Specific Activities of U 235 and U 238 Physical Review C. ,vol. 4, pp. 1889- 1906 ,(1971) , 10.1103/PHYSREVC.4.1889
S. Richter, A. Alonso-Munoz, R. Eykens, U. Jacobsson, H. Kuehn, A. Verbruggen, Y. Aregbe, R. Wellum, E. Keegan, The isotopic composition of natural uranium samples—Measurements using the new n(233U)/n(236U) double spike IRMM-3636 International Journal of Mass Spectrometry. ,vol. 269, pp. 145- 148 ,(2008) , 10.1016/J.IJMS.2007.09.012
James M. Mattinson, Analysis of the relative decay constants of 235U and 238U by multi-step CA-TIMS measurements of closed-system natural zircon samples Chemical Geology. ,vol. 275, pp. 186- 198 ,(2010) , 10.1016/J.CHEMGEO.2010.05.007
Richard A. Stern, Simon Bodorkos, Sandra L. Kamo, Arthur H. Hickman, Fernando Corfu, Measurement of SIMS Instrumental Mass Fractionation of Pb Isotopes During Zircon Dating Geostandards and Geoanalytical Research. ,vol. 33, pp. 145- 168 ,(2009) , 10.1111/J.1751-908X.2009.00023.X