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GEOREF RECORD

Antimony in hydrothermal processes; solubility, conditions of transfer, and metal-bearing capacity of solutions

A. A. Obolensky, L. V. Gushchina, A. S. Borisenko, A. A. Borovikov and G. G. Pavlova
Antimony in hydrothermal processes; solubility, conditions of transfer, and metal-bearing capacity of solutions
Russian Geology and Geophysics (December 2007) 48 (12): 992-1001

Abstract

Based on data on the composition of ore-bearing hydrothermal solutions and parameters of ore-forming processes at various antimony and antimony-bearing deposits, which were obtained in studies of fluid inclusions in ore minerals, we investigated the behavior of Sb(III) in the system Sb-Cl-H (sub 2) S-H (sub 2) O describing the formation of these deposits. We also performed thermodynamic modeling of native-antimony and stibnite dissolution in sulfide (m (sub HS) - = 0.0001-0.1) and chloride (m (sub Cl-) = 0.1-5) solutions and the joint dissolution of Sb (sub (s)) (super 0) and Sb (sub 2) S (sub 3(s)) in sulfide-chloride solution (m (sub HS-) = 0.01; m (sub Cl-) = 1) depending on Eh, pH, and temperature. All thermodynamic calculations were carried out using the Chiller computer program. Under the above conditions, stibnite precipitates in acid, weakly acid to neutral, and medium redox solutions, whereas native antimony precipitates before stibnite under more reducing conditions in neutral to alkaline solutions. The metal-bearing capacity of hydrothermal solutions (200-250 degrees C) of different compositions and origins has been predicted. We have established that the highest capacity is specific for acid (pH = 2-3) high-chloride solutions poor in sulfide sulfur and alkaline (pH = 7-8) low-chloride low-sulfide solutions.


ISSN: 1068-7971
Serial Title: Russian Geology and Geophysics
Serial Volume: 48
Serial Issue: 12
Title: Antimony in hydrothermal processes; solubility, conditions of transfer, and metal-bearing capacity of solutions
Affiliation: Russian Academy of Sciences, Siberian Division, Sobolev Institute of Geology and Mineralogy, Novosibirsk, Russian Federation
Pages: 992-1001
Published: 20071210
Text Language: English
Publisher: Allerton Press, New York, NY, United States
Accession Number: 2019-002593
Categories: General geochemistry
Document Type: Serial
Bibliographic Level: Analytic
Annotation: Based on Publisher-supplied data
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from CAPCAS, Elsevier Scientific Publishers, Amsterdam, Netherlands
Update Code: 201902
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