| Abstract: | Mineable zones of the Spar Lake deposit occur where argentiferous Cu sulfides and native Ag formed cements and replaced certain earlier cements and clasts in the gently dipping middle quartzite beds of the upper member of the Revett Formation, middle Proterozoic Belt Supergroup. The Cu sulfides and native Ag are part of a large, zoned system of authigenic ore and gangue minerals at Spar Lake. Mineral zone boundaries of ore and gangue phases cross all 5 stratigraphic units of the upper member. Deduced depositional environments for the host sedimentary rocks include beach and nearshore slope environments for the lower quartzite beds and subtidal(?) channels for the middle quartzite beds. The deposit must be epigenetic because mineral zone boundaries cross every facies in the sequence of beach and nearshore slope sediments. The distributions of mineral zones and ore grades were controlled by 2 factors, one inherited from sedimentation and the other from preore diagenesis.-from Authors |
| Genre: | Article |
| ProdID: | 70015191 |
| Citation Author: | Hayes, T. S.; Einaudi, M. T. |
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| Citation End Page: | 1931 |
| Citation Issue: | 8 |
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| Citation Language: | English |
| Citation Larger Work Title: | Economic Geology |
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| Citation Number Of Pages: | 33 |
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| Citation Search Results Text: | Genesis of the Spar Lake strata-bound copper- silver deposit, Montana: part I. Controls inherited from sedimentation and preore diagenesis ( USA).; 1986; Article; Journal; Economic Geology; Hayes, T. S.; Einaudi, M. T. |
| Citation Start Page: | 1899 |
| Citation Volume: | 81 |
| Citation Year: | 1986 |
| Type: | citation/reference |
| Text: | Genesis of the Spar Lake strata-bound copper- silver deposit, Montana: part I. Controls inherited from sedimentation and preore diagenesis ( USA).; 1986; Article; Journal; Economic Geology; Hayes, T. S.; Einaudi, M. T. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Wed, 1 Jan 1986 00:00 -0600 |
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