| Abstract: | The Ranger No. 1 and No. 3 orebodies contain about 124,000 tonnes U//3O//8 in highly chloritized metasediments of the lower Proterozoic Cahill Formation within about 500 m of the projected sub-Kombolgie Formation unconformity. In both orebodies, oxidized and reduced uranium minerals occur chiefly in quartzose schists that have highly variable amounts of muscovite, sericite, and chlorite. The effects of several periods of alteration are pervasive in the vicinity of orebodies where biotite and garnet are altered to chlorite, and feldspars to white mica or chlorite. Oxidized uranium minerals, associated with earthy iron oxides, occur from the surface to a depth of about 60 m. Below the oxidized zone, uranium occurs chiefly as uraninite and pitchblende disseminated through thick sections of quartz-chlorite-muscovite schist and has no apparent association with graphite or sulphides. The geologic age(s) of uranium emplacement are obscure because there are few age criteria. Reduced uranium minerals are younger than 1. 8-b. y. -old granite dykes, and some occur locally in 1. 65-b. y. -old Kombolgie Formation. |
| Genre: | Conference Paper |
| ProdID: | 70012391 |
| Citation Author: | Nash, J. Thomas; Frishman, David |
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| Citation Editor: | Sibbald T.I.I.Petruk William |
| Citation End Page: | 215 |
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| Citation Language: | English |
| Citation Larger Work Title: | CIM Special Volume |
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| Citation Number Of Pages: | 11 |
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| Citation Publisher: | CIM |
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| Citation Search Results Text: | PROGRESS REPORT ON GEOLOGIC STUDIES OF THE RANGER OREBODIES, NORTHERN TERRITORY, AUSTRALIA.; 1985; Conference Paper; CIM Special Volume; Nash, J. Thomas; Frishman, David |
| Citation Start Page: | 205 |
| Citation Volume: | 32 |
| Citation Year: | 1985 |
| Type: | citation/reference |
| Text: | PROGRESS REPORT ON GEOLOGIC STUDIES OF THE RANGER OREBODIES, NORTHERN TERRITORY, AUSTRALIA.; 1985; Conference Paper; CIM Special Volume; Nash, J. Thomas; Frishman, David |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/outside_thumb.jpg |
| Date Other: | Tue, 1 Jan 1985 00:00 -0600 |
| Publisher: | CIM |
