Concentration of radioactive elements in deep crustal material

Details Concentration of radioactive elements in deep crustal material Concentration of radioactive elements in deep crustal material

Jan 1965

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1965gecoa..29...53h&link_type=abstract

Geochimica et Cosmochimica Acta, vol. 29, Issue 1, pp.53-61

Mathematics

Logic

20

Scientific paper

Th, U and K have been determinedin paragneisses of different metamorphic grade. Both Th and U concentrations are lower in granulite facies rocks than in more low-grade metamorphic rocks of equivalent nature. Thus geological processes operating in the crust must result in an upward concentration of these elements. The Th / U ratio of the paragneisses shows a wide variation which is related to the oxidation of U. Some evidence exists for a decrease of the Th / U ratios with metamorphic grade.

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