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Gold to aurostibite transformation and formation of Au-Ag-Sb phases; the Krasna Hora Deposit, Czech Republic

Jiri Zacharias and Matej Nemec
Gold to aurostibite transformation and formation of Au-Ag-Sb phases; the Krasna Hora Deposit, Czech Republic
Mineralogical Magazine (August 2017) 81 (4): 987-999

Abstract

Rare phases of the Au-Ag-Sb system were recognized in the Krasna Hora Sb-Au deposit (Sb 1.5-3 wt.%; Au 3-5 ppm), Czech Republic which correspond to auriferous dyscrasite (up to 7 at.% Au), auriferous allargentum (up to 34 at.% Au), and an unnamed phase with composition similar to the eutectics (E (sub 1) , E (sub 2) ) of the experimental Au-Ag-Sb system. The dominant ore mineral is stibnite with rare native antimony, native gold and a Ag-Au alloy. Textural relationships are well established: stibnite (early) --> gold --> aurostibite --> native antimony (late). Gold is present in four generations: Au-1 (0-15 at.% Ag) is the most abundant type; Au-2 (20-70 at.% Ag) forms thin rims along intra-grain boundaries of Au-1; Au-3 and Au-4 are rare and almost pure ( approximately 0 at.% Ag). The formation of most of the Au-2 and of Au-Ag-Sb phases is associated with Ag-mobilization coupled with the Au-1 to aurostibite transformation via dissolution-precipitation and solid-state diffusion processes at temperatures <200 degrees C.


ISSN: 0026-461X
EISSN: 1471-8022
Coden: MNLMBB
Serial Title: Mineralogical Magazine
Serial Volume: 81
Serial Issue: 4
Title: Gold to aurostibite transformation and formation of Au-Ag-Sb phases; the Krasna Hora Deposit, Czech Republic
Affiliation: Charles University, Institute of Geochemistry, Mineralogy and Mineral Resources, Prague, Czech Republic
Pages: 987-999
Published: 201708
Text Language: English
Publisher: Mineralogical Society, London, United Kingdom
References: 36
Accession Number: 2017-072973
Categories: Mineralogy of non-silicatesEconomic geology, geology of ore deposits
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
N48°31'60" - N51°04'00", E12°05'60" - E16°49'60"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Mineralogical Society of Great Britain and Ireland. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201738
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