Genesis and health risk implications of an unusual occurrence of fibrous NaFe^sup 3+^-amphibole

Fibrous NaFe...-amphiboles (winchite, richterite, and magnesioriebeckite) form primarily by alkali metasomatism from magmatic fluids expelled from carbonatite or peralkaline silicate magmas, and have been implicated in high rates of death and disease at Libby, Montana (USA). Fibrous NaFe...-amphibol...

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Bibliographic Details
Published in:Geology (Boulder) 2015-01, Vol.43 (1), p.63
Main Authors: Metcalf, Rodney V, Buck, Brenda J
Format: Article
Language:English
Subjects:
Geochemistry
Geological time
Minerals
Sediment transport
Sedimentary geology
Sedimentation & deposition
Soil erosion
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Summary:Fibrous NaFe...-amphiboles (winchite, richterite, and magnesioriebeckite) form primarily by alkali metasomatism from magmatic fluids expelled from carbonatite or peralkaline silicate magmas, and have been implicated in high rates of death and disease at Libby, Montana (USA). Fibrous NaFe...-amphiboles, principally winchite and magnesioriebeckite, are found as fracture-fill veins and as replacement of magmatic hornblende in faulted margins of the dominantly subalkaline, metaluminous Miocene Wilson Ridge pluton, Mohave County, Arizona (USA). Here, the fibrous NaFe...-amphiboles formed from hypersodic, high-... hydrothermal fluids, which circulated through active faults as the pluton cooled through subsolidus temperatures. Halite deposits in adjacent Miocene sedimentary basins are the likely source of Na in the hydrothermal fluid. Amphibole fibers are
ISSN:0091-7613
1943-2682