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The Mokrsko Gold Deposit—the Largest Gold Deposit in the Bohemian Massif, Czechoslovakia

By
P. MorÁvek
P. MorÁvek
Geoindustria, U priihonu 32, Praha 7, Czechoslovakia
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J. Janatka
J. Janatka
Geoindustria, U priihonu 32, Praha 7, Czechoslovakia
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J. PertoldovÁ
J. PertoldovÁ
Geoindustria, U priihonu 32, Praha 7, Czechoslovakia
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E. Straka
E. Straka
Geoindustria, U priihonu 32, Praha 7, Czechoslovakia
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J. ĎuriŠovÁ
J. ĎuriŠovÁ
Geological Survey Prague, Malostranske nam. 19, Praha 1, Czechoslovakia
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M. PudilovÁ
M. PudilovÁ
Charles University, Department of Economic Geology, Albertov 6, Praha 2, Czechoslovakia
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Published:
January 01, 1989

Abstract

The recently discovered Mokrsko deposit represents the largest gold deposit in the Bohemian massif. The deposit occurs in upper Proterozoic volcano-sedimentary rocks of the Jilove belt (640-700? Ma) and in granodiorite of Hercynian age (320-360 Ma). Gold-bearing quartz mineralization of vein and stockwork types is structurally and lithologically controlled. The lack of wall-rock alteration and the similar chemistry of amphibole and biotite from quartz veins and adjacent rocks suggest similar P-T conditions of origin. The temperature ranges obtained for the quartz veins (fluid inclusions: 250°-350°C; oxygen isotopes: 330°-420°C) and the temperatures and pressure of the adjacent rocks (500°-630°C); P<0.4 GPa) indicate that the gold mineralization occurred in the same temperature ranges as epidote-amphibolite and lower amphibolite facies metamorphism. The rock geochemistry suggests a hydrothermal metamorphic mobilization of gold from upper Proterozoic rocks with a possible enrichment by magmatic fluids.

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Contents

Economic Geology Monograph Series

The Geology of Gold Deposits: The Perspective in 1988

Reid R. Keays
Reid R. Keays
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W. R. H. Ramsay
W. R. H. Ramsay
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David I. Groves
David I. Groves
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Society of Economic Geologists
ISBN electronic:
9781629490014
Publication date:
January 01, 1989

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