| 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. |
| Genre: | Article |
| ProdID: | 70013341 |
| Citation Author: | Gair, J. E.; Slack, J. F. |
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| Citation End Page: | 1520 |
| Citation Issue: | 7 |
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| Citation Language: | English |
| Citation Larger Work Title: | Economic Geology |
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| Citation Number Of Pages: | 38 |
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| Citation Search Results Text: | Deformation, geochemistry, and origin of massive sulfide deposits, Gossan lead district, Virginia.; 1984; Article; Journal; Economic Geology; Gair, J. E.; Slack, J. F. |
| Citation Start Page: | 1483 |
| Citation Volume: | 79 |
| Citation Year: | 1984 |
| Type: | citation/reference |
| Text: | Deformation, geochemistry, and origin of massive sulfide deposits, Gossan lead district, Virginia.; 1984; Article; Journal; Economic Geology; Gair, J. E.; Slack, J. F. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Sun, 1 Jan 1984 00:00 -0600 |
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