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GEOREF RECORD

Temporal evolution of arc magmatism and hydrothermal activity, including epithermal gold veins, Borovitsa Caldera, southern Bulgaria

Brad Singer and Peter Marchev
Temporal evolution of arc magmatism and hydrothermal activity, including epithermal gold veins, Borovitsa Caldera, southern Bulgaria
Economic Geology and the Bulletin of the Society of Economic Geologists (August 2000) 95 (5): 1155-1164

Abstract

The Spahievo ore district, S Bulgaria, is adjacent to the Oligocene Borovitsa caldera, one of the largest in Europe. (super 40) Ar/ (super 39) Ar ages determined using a CO (sub 2) laser to fuse or incrementally heat minerals from fresh igneous and altered rocks indicate a rapid succession of: 1) pre-caldera intermediate magmatism including monzonitic intrusion and coeval porphyry-style mineralization and advanced argillic alteration between 32.9 and 32.3 m.y., 2) rhyolitic ash-flow tuffs, dykes and domes with adularia-sericite alteration accompanied by epithermal precious metal mineralization at 32.1 m.y. and 3) nearly synchronous collapse of a nested caldera and intrusion of a ring-fault rhyolite dome and intracaldera dykes at 31.8 m.y. These ages link monzonitic intrusion, Cu-Mo mineralization and advanced argillic alteration, and indicate that the rhyolitic magmatism and adularia-sericite alteration (with Au mineralization) is younger by approximately 100-500 k.y. but preceded caldera collapse by approximately 300 k.y.


ISSN: 0361-0128
EISSN: 1554-0774
Coden: ECGLAL
Serial Title: Economic Geology and the Bulletin of the Society of Economic Geologists
Serial Volume: 95
Serial Issue: 5
Title: Temporal evolution of arc magmatism and hydrothermal activity, including epithermal gold veins, Borovitsa Caldera, southern Bulgaria
Affiliation: University of Wisconsin at Madison, Department of Geology and Geophysics, Madison, WI, United States
Pages: 1155-1164
Published: 200008
Text Language: English
Publisher: Economic Geology Publishing Company, Lancaster, PA, United States
References: 37
Accession Number: 2001-003073
Categories: Economic geology, geology of ore deposits
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 2 tables, geol. sketch map
N42°06'00" - N42°06'00", E25°19'60" - E25°19'60"
Secondary Affiliation: Bulgarian Academy of Sciences, BGR, Bulgaria
Country of Publication: United States
Secondary Affiliation: GeoRef, Copyright 2018, American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
Update Code: 200101
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