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Deformation, geochemistry, and origin of massive sulfide deposits, Gossan lead district, Virginia.

Economic Geology

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Abstract

Lenses and layers of massive sulphides comprise a discontinuous horizon in the late Proterozoic metasedimentary Ashe formation. The folded and brecciated sulphides include pyrrhotite, minor chalcopyrite, sphalerite and pyrite, and rare arsenopyrite and galena. The deposits were mined for supergene copper, later for gossan iron, and finally for sulphur. The Ashe formation is interpreted to be marine turbidites, and contains lenses of mafic rocks of probable tholeiitic basalt parentage. Mineralogically and chemically distinctive rocks - for the Ashe formation - are interbedded with the sulphides and may represent metamorphosed alteration zones and/or mixed chemical and clastic sediments. The sulphide deposits are interpreted as syngenetic sediments, modified by deformation during metamorphism. Their deposition occurred in a deep, elongate marine basin overlying a crustal rift zone.-G.J.N.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Deformation, geochemistry, and origin of massive sulfide deposits, Gossan lead district, Virginia.
Series title:
Economic Geology
Volume
79
Issue:
7
Year Published:
1984
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
1483
Last page:
1520
Number of Pages:
38