Allanite alteration in the granites under the Streltsovka caldera (Transbaikalia, Russia). A possible uranium source for the deposits.

Authors
Chabiron, A Cuney, M
Citation
A. Chabiron et M. Cuney, Allanite alteration in the granites under the Streltsovka caldera (Transbaikalia, Russia). A possible uranium source for the deposits., CR AC S IIA, 332(2), 2001, pp. 99-105
Citations number
20
Categorie Soggetti
Earth Sciences
Journal title
COMPTES RENDUS DE L ACADEMIE DES SCIENCES SERIE II FASCICULE A-SCIENCES DELA TERRE ET DES PLANETES
ISSN journal
12518050 → ACNP
Volume
332
Issue
2
Year of publication
2001
Pages
99 - 105
Database
ISI
SICI code
1251-8050(20010130)332:2<99:AAITGU>2.0.ZU;2-I
Abstract
The uranium deposits of the Streltsovka caldera represent the largest urani um field associated with volcanics in the world (200 000 t U). The caldera is located over a Hercynian granitic basement. From their mineralogical and geochemical characteristics the metaluminous porphyritic biotite granite b elongs to the subalkaline sodipotassic type enriched in K, U and Th. The: p ervasive and intensive hydrothermal alteration of these granites allows ura nium to be extracted from refractory accessory minerals such as allanite. M ass balance calculation indicates that allanite alteration to monazite and REE carbonates may liberate 1638 t U.km(-3) of granite. (C) 2001 Academie d es sciences / Editions scientifiques et medicales Elsevier SAS.