Geochemical, isotopic, and geochronlologic constraints on the formation of the Eagle Point basement-hosted uranium deposit, Athabasca Basin, Saskatchewan, Canada and recent remobilization of primary uraninite in secondary structures
Cloutier, J; Kyser, K; Olivo, GR; Brisbin, Dan
| HERO ID | 1438330 |
|---|---|
| In Press | No |
| Year | 2011 |
| Title | Geochemical, isotopic, and geochronlologic constraints on the formation of the Eagle Point basement-hosted uranium deposit, Athabasca Basin, Saskatchewan, Canada and recent remobilization of primary uraninite in secondary structures |
| Authors | Cloutier, J; Kyser, K; Olivo, GR; Brisbin, Dan |
| Journal | Mineralium Deposita |
| Volume | 46 |
| Issue | 1 |
| Page Numbers | 35-56 |
| Abstract | The Athabasca Basin hosts many world-class unconformity related uranium deposits. Recently, uranium reserves for the Eagle Point basement-hosted deposit have increased with the discovery of new mineralized zones within secondary structures. A paragenetic study of Eagle Point reveals the presence of three temporally distinct alteration stages: a pre-Athabasca alteration, a main alteration and mineralization comprised of three substages, and a post-main alteration and mineralization stage that culminated in remobilization of uraninite from primary to secondary structures. The pre-Athabasca alteration stage consists of minor amounts of clinochlore, followed by dolomite and calcite alteration in the hanging wall of major fault zones and kaolinitization of plagioclase and K-feldspar caused by surface weathering. The main alteration and uranium mineralization stage is related to three temporally distinct substages, all of which were produced by isotopically similar fluids. A major early alteration substage characterized by muscovite alteration and by precipitation Ca-Sr-LREE-rich aluminum phosphate-sulfate minerals, both from basinal fluids at temperatures around 240A degrees C prior to 1,600 Ma. The mineralization substage involved uraninite and hematite precipitated in primary structures. The late alteration substage consists of dravite, uranophane-beta veins, calcite veins, and sudoite alteration from Mg-Ca-rich chemically modified basinal fluids with temperatures around 180A degrees C. The post-main alteration and mineralization stage is characterized by remobilization of main stage uraninite from primary to secondary structures at a minimum age of ca. 535 Ma. U-Pb resetting events recorded on primary and remobilized uraninites are coincident with fluid flow induced by distal orogenies, remobilizing radiogenic Pb to a distance of at least 225 m above the mineralized zones. |
| Doi | 10.1007/s00126-010-0308-5 |
| Wosid | WOS:000286675700004 |
| Is Certified Translation | No |
| Dupe Override | No |
| Comments | Source: Web of Science WOS:000286675700004 |
| Is Public | Yes |
| Keyword | Eagle Point; Unconformity-related uranium deposit; Basement-hosted; Geochemistry; Geochronology; Secondary uraninite |