Concentration of radioactive elements in deep crustal material

Autor:	J.A.S Adams, K.S Heier
Rok vydání:	1965
Předmět:	Metamorphic rock Geochemistry Thorium chemistry.chemical_element Crust Uranium Granulite chemistry Geochemistry and Petrology Facies Isograd Petrology Metamorphic facies Geology
Zdroj:	Geochimica et Cosmochimica Acta. 29:53-61
ISSN:	0016-7037
DOI:	10.1016/0016-7037(65)90078-5
Popis:	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.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::27c639005fb18f52571fd63d04a19590 https://doi.org/10.1016/0016-7037(65)90078-5 Zobrazit plný text záznamu