Journal
STRATIGRAPHY AND GEOLOGICAL CORRELATION
Volume 18, Issue 3, Pages 252-268Publisher
MAIK NAUKA/INTERPERIODICA/SPRINGER
DOI: 10.1134/S0869593810030032
Keywords
Precambrian; sedimentary carbonate rocks; U-Th-Pb systematics; Pb-Pb dating; geochemical criteria of conservation; step solution
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Funding
- Division of Earth Sciences, Russian Academy of Sciences [4]
- Russian Foundation for Basic Research [08-05-00119, 08-05-00641]
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The current state in the Pb-Pb dating of the formation and epigenesis of Precambrian carbonate sediments has been reviewed. The geochemistry of admixture elements (U, Th, Pb, Rb, Sr, Mn, and Fe) constituting carbonate minerals and the redistribution of the elements in the course of early diagenesis and epigenesis have been considered. The advantages of choosing samples for Pb-Pb dating on the basis of geochemical criteria similar to those applied for Sr-isotope stratigraphy and the potentialities of applying different methods of decontamination of specimens, analyzed from surface contamination and possible epigenetic carbonate phases, were illustrated. By the example of a series of carbonate formations, distinctions in susceptibility of U-Pb and Rb-Sr systems of carbonate minerals to secondary transformations have been demonstrated. The prospects for using the method of step solution allowing noncogenetic carbonate generations to be separated and thus the accuracy and reliability of Pb-Pb dates to be upgraded were considered.
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