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High correlation coefficients between the activity ratios of the uranium and thorium isotopes common for the "isochron" approach of 230Th/U dating of dirty material mask the requirement to check for closed-system conditions of uranium in addition to the detrital correction of 230Th/U ages. The difficulty to calculate standard deviations of 230Th/U dates derived by the "isochron" approach complicates the problem. The methodical reasons are discussed. Closed-system conditions are checked by the 234U/ 238U - 230Th/ 238U AR plot which can also be used to carry out least-squares fitted detrital correction of 230Th/U ages of dirty material.
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Tom
Strony
9--14
Opis fizyczny
Bibliogr. 16 poz. rys., tab., wykr.
Twórcy
Bibliografia
- 1. Butler J. C., 1982: Artificial isochrons. Lithos 15: 207–214.
- 2. Brooks C., Wendt I. and Harre W., 1968: A two-error regression treatment and its application to Rb-Sr and initial Sr87/Sr86 ratios of younger Variscan granitic rocks from the Schwarzwald Massif, southwest Germany. Journal of Geophysical Research 73: 6071–6084.
- 3. Chayes F., 1949: On ratio correlation in petrography. Journal of Geology 57: 239–254.
- 4. Chayes F., 1971: Ratio Correlation. A Manual for Students of Petrology and Geochemistry. University Chicago Press, ChicagoLondon: 99 pp.
- 5. Dodson M. H., 1982: On „spurious” correlations in Rb-Sr isochron diagrams. Lithos 15: 215–219.
- 6. Geyh M. A., 1994: Precise “Isochron“ – Derived Detritus-Corrected U/Th Dates. Poster on the 16th Radiocarbon Conference, Groningen, June 1994.
- 7. Geyh M. A., Hennig G. and Oezen D., 1997: U/Th-Datierung interglazialer und interstadialer Niedermoortorfe und Lignite - Stand und Zukunft. Schriftenreihe der Deutschen Geologischen Gesellschaft 4: 187–200.
- 8. Ivanovich M. and Harmon R. S. (eds.), 1992: Uranium-Series Disequilibrium: Applications to Earth, Marine and Environmental Sciences (2nd ed.) Clarendon Press, Oxford: 920 pp.
- 9. Kaufman A., 1993: An evaluation of several methods for determining 230Th/U ages in impure carbonates. Geochimica et Cosmochimica Acta 57: 2303–2317.
- 10. Kaufman A. and Broecker W. S., 1965: Comparison of Th230 and C14 ages for carbonate materials from lakes Lahontan and Bonneville. Journal of Geophysical Research 70: 4039–4054.
- 11. Ku T. L. and Liang Z. Ch., 1984: The dating of impure carbonates with decay-series isotopes. Nuclear Instruments and Methods in Physical Research 223: 563–571.
- 12. Ludwig K. R. and Titteringon D. M. 1994: Calculation of 230Th/U isochrons, ages, and errors. Geochimica et Cosmochimica Acta 58: 5031 – 5042.
- 13. Wendt I., 1986: Radiometrische Methoden in der Geochronologie. Clausthaler Tektonische Hefte 23, Clausthal-Zellerfeld: 170 pp.
- 14. York D., 1966: Least-squares fitting of a straight line. Canadian Journal of Physics 44: 1079–1086.
- 15. York D., 1967: The best isochron. Earth and Planetary Science Letters 2: 479–482.
- 16. York D., 1969: Least squares fitting of a straight line with correlated errors. Earth and Planetary Science Letters 5: 320–324.
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Bibliografia
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bwmeta1.element.baztech-article-BAT3-0007-0031