NDLI: Radiation damage-controlled localization of alteration haloes in albite: implications for alteration types and patterns vis-à-vis mineralization and element mobilization

Content Provider	Springer Nature Link
Author	Pal, D. C. Chaudhuri, T.
Copyright Year	2016
Abstract	Uraninite, besides occurring in other modes, occurs as inclusions in albite in feldspathic schist in the Bagjata uranium deposits, Singhbhum shear zone, India. The feldspathic schist, considered the product of Na-metasomatism, witnessed multiple hydrothermal events, the signatures of which are preserved in the alteration halo in albite surrounding uraninite. Here we report radiation damage-controlled localization of alteration halo in albite and its various geological implications. Microscopic observation and SRIM/TRIM simulations reveal that the dimension of the alteration halo is dependent collectively on the zone of maximum cumulative α dose that albite was subjected to and by the extent of dissolution of uraninite during alteration. In well-preserved alteration haloes, from uraninite to the unaltered part of albite, the alteration minerals are systematically distributed in different zones; zone-1: K-feldspar; zone-2: chlorite; zone-3: LREE-phase/pyrite/U-Y-silicate. Based on textures of alteration minerals in the alteration microdomain, we propose a generalized Na+➔K+➔H+ alteration sequence, which is in agreement with the regional-scale alteration pattern. Integrating distribution of ore and alteration minerals in the alteration zone and their geochemistry, we further propose multiple events of U, REE, and sulfide mineralization/mobilization in the Bagjata deposit. The alteration process also involved interaction of the hydrothermal fluid with uraninite inclusions resulting in resorption of uraninite, redistribution of elements, including U and Pb, and resetting of isotopic clock. Thus, our study demonstrates that alteration halo is a miniature scale-model of the regional hydrothermal alteration types and patterns vis-à-vis mineralization/mobilization. This study further demonstrates that albite is vulnerable to radiation damage and damage-controlled fluid-assisted alteration, which may redistribute metals, including actinides, from radioactive minerals included in albite. This has important implications in geochronology. Such a study can also provide important clues to the chemical behavior of granite, in which albite is a common constituent, in a physico-chemical ambience analogous to a site of deep borehole disposal of radioactive waste.
Starting Page	823
Ending Page	843
Page Count	21
File Format	PDF
ISSN	09300708
Journal	Mineralogy and Petrology
Volume Number	110
Issue Number	6
e-ISSN	14381168
Language	English
Publisher	Springer Vienna
Publisher Date	2016-07-21
Publisher Place	Vienna
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Uraninite Albite Radiation damage Alteration halo Mineralization Waste disposal Singhbhum India Mineralogy Inorganic Chemistry Geochemistry
Content Type	Text
Resource Type	Article
Subject	Geophysics Geochemistry and Petrology

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