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Fluid inclusions in sphalerite as negative crystals; a case study

Ivan K. Bonev and Kalin Kouzmanov
Fluid inclusions in sphalerite as negative crystals; a case study
European Journal of Mineralogy (June 2002) 14 (3): 607-620

Abstract

The crystal morphology of vacuoles of fluid inclusions in some transparent, low-iron and relatively low-temperature sphalerites from the vein and replacement Pb-Zn ore deposits of the Madan ore district, Bulgaria, was studied both by optical microscopy in oriented thin sections and by SEM on open cleavage surfaces. The vacuoles represent negative crystals bounded by faces of d{110}, 0{111} and -0{111} forms together with small faces of a{100}, e{210}, n{211}, p{221}, -n{211} and -p{221} forms. Their corners and edges are rounded. The primary inclusions, formed mainly at 200-220 degrees C, have an isometric, elongated, tubular, spindle-like or acute-angled habit depending on their position and the influence of the growth defects (growth zones, subgrain and sector boundaries, twin planes, etc.). The secondary fluid inclusions, healing fractures in sphalerite crystals mainly at 160-185 degrees C, are strongly controlled by the thickness and local configuration of the crack surfaces. They are flat, irregular or isometric in shape. It is suggested that the fluid inclusions in the low-T sphalerite usually preserve their initial high-energy and non-equilibrium crystal morphology formed during periods of rapid growth.


ISSN: 0935-1221
EISSN: 1617-4011
Serial Title: European Journal of Mineralogy
Serial Volume: 14
Serial Issue: 3
Title: Fluid inclusions in sphalerite as negative crystals; a case study
Affiliation: Bulgarian Academy of Sciences, Geological Institute, Sofia, Bulgaria
Pages: 607-620
Published: 200206
Text Language: English
Publisher: Schweizerbart'sche Verlagsbuchhandlung (Naegele u. Obermiller), Stuttgart, Federal Republic of Germany
References: 39
Accession Number: 2002-047663
Categories: Mineralogy of non-silicates
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 1 table
N41°30'00" - N41°30'00", E24°56'60" - E24°56'60"
Secondary Affiliation: Sofia University, BGR, Bulgaria
Country of Publication: Germany
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute.
Update Code: 200216
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