Broad Synchroneity of Three Gold Mineralization Styles in the Kalgoorlie Gold Field: SHRIMP, U-Pb, and Ar-40/Ar-39 Geochronological Evidence
There has been a long-standing controversy regarding the timing and number of gold mineralization events at Kalgoorlie. Uranium-Pb dating of zircons' and hydrothermal monazite and xenotime, as well as Ar-40/Ar-39 analysis of metasomatic fuchsite and white mica. are used to date pre- to synore d...
| Main Authors: | , , , , |
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| Format: | Journal Article |
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Society of Economic Geologists Inc
2010
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| Online Access: | http://hdl.handle.net/20.500.11937/31610 |
| _version_ | 1848753428233191424 |
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| author | Vielreicher, N. Groves, D. Snee, L. Fletcher, Ian McNaughton, Neal |
| author_facet | Vielreicher, N. Groves, D. Snee, L. Fletcher, Ian McNaughton, Neal |
| author_sort | Vielreicher, N. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | There has been a long-standing controversy regarding the timing and number of gold mineralization events at Kalgoorlie. Uranium-Pb dating of zircons' and hydrothermal monazite and xenotime, as well as Ar-40/Ar-39 analysis of metasomatic fuchsite and white mica. are used to date pre- to synore dikes. alteration, and orebodies in order to resolve this issue. The majority of gold mineralization at Kalgoorlie, including ductile-brittle Fimiston-, brittle-ductile Oroya- and brittle Mount Charlotte-style gold, are different expressions of a complex mineralizing system that was active at broadly the same time at ca. 2.64 Ga. Gold mineralization was thus deposited in both ductile and brittle structures at approximately the same crustal level at broadly the same time, limier similar-PT conditions. This giant ore system formed after ea. 2.69 Ga basic magmatism, intrusion of the Golden Mile Dolerite sill at 2680 ± 9 Ma, and intrusion or calc-alkaline feldspar-quartz porphyry dikes at 2670 ± 5 Ma. Gold mineralization was broadly coeval with lamprophyre dike intrusion at 2642 ± 6 Ma and overlapped the waning stages of hornblende and albite-bearing porphyry dike emplacement at 2650 ± 6 Ma and regional metamorphism. Subsequent brittle deformation in the Kalgoorlie gold held way, accompanied by hydrothermal activity that may have led to some late gold mineralization or remobilization in extensional quartz vein arrays in the Golden Mile between about 2.61 and 2.60 Ca. This late hydrothermal activity and associated brittle deformation marks the last event to significantly affect the rocks it Kalgoorlie and may be related to uplift lift and final cooling of the terrane. Despite this late event, the geometry of the Kalgoorlie gold field and its contained lode systems has remained essentially the same since the time of gold mineralization. |
| first_indexed | 2025-11-14T08:24:21Z |
| format | Journal Article |
| id | curtin-20.500.11937-31610 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T08:24:21Z |
| publishDate | 2010 |
| publisher | Society of Economic Geologists Inc |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-316102017-01-30T13:26:22Z Broad Synchroneity of Three Gold Mineralization Styles in the Kalgoorlie Gold Field: SHRIMP, U-Pb, and Ar-40/Ar-39 Geochronological Evidence Vielreicher, N. Groves, D. Snee, L. Fletcher, Ian McNaughton, Neal Ion-Microprobe Shear Zone Age Constraints Mile Deposit Decay Constants Eastern Goldfields Superterrane Absolute Ages Yilgarn Craton Greenstone Terranes Western-Australia There has been a long-standing controversy regarding the timing and number of gold mineralization events at Kalgoorlie. Uranium-Pb dating of zircons' and hydrothermal monazite and xenotime, as well as Ar-40/Ar-39 analysis of metasomatic fuchsite and white mica. are used to date pre- to synore dikes. alteration, and orebodies in order to resolve this issue. The majority of gold mineralization at Kalgoorlie, including ductile-brittle Fimiston-, brittle-ductile Oroya- and brittle Mount Charlotte-style gold, are different expressions of a complex mineralizing system that was active at broadly the same time at ca. 2.64 Ga. Gold mineralization was thus deposited in both ductile and brittle structures at approximately the same crustal level at broadly the same time, limier similar-PT conditions. This giant ore system formed after ea. 2.69 Ga basic magmatism, intrusion of the Golden Mile Dolerite sill at 2680 ± 9 Ma, and intrusion or calc-alkaline feldspar-quartz porphyry dikes at 2670 ± 5 Ma. Gold mineralization was broadly coeval with lamprophyre dike intrusion at 2642 ± 6 Ma and overlapped the waning stages of hornblende and albite-bearing porphyry dike emplacement at 2650 ± 6 Ma and regional metamorphism. Subsequent brittle deformation in the Kalgoorlie gold held way, accompanied by hydrothermal activity that may have led to some late gold mineralization or remobilization in extensional quartz vein arrays in the Golden Mile between about 2.61 and 2.60 Ca. This late hydrothermal activity and associated brittle deformation marks the last event to significantly affect the rocks it Kalgoorlie and may be related to uplift lift and final cooling of the terrane. Despite this late event, the geometry of the Kalgoorlie gold field and its contained lode systems has remained essentially the same since the time of gold mineralization. 2010 Journal Article http://hdl.handle.net/20.500.11937/31610 Society of Economic Geologists Inc restricted |
| spellingShingle | Ion-Microprobe Shear Zone Age Constraints Mile Deposit Decay Constants Eastern Goldfields Superterrane Absolute Ages Yilgarn Craton Greenstone Terranes Western-Australia Vielreicher, N. Groves, D. Snee, L. Fletcher, Ian McNaughton, Neal Broad Synchroneity of Three Gold Mineralization Styles in the Kalgoorlie Gold Field: SHRIMP, U-Pb, and Ar-40/Ar-39 Geochronological Evidence |
| title | Broad Synchroneity of Three Gold Mineralization Styles in the Kalgoorlie Gold Field: SHRIMP, U-Pb, and Ar-40/Ar-39 Geochronological Evidence |
| title_full | Broad Synchroneity of Three Gold Mineralization Styles in the Kalgoorlie Gold Field: SHRIMP, U-Pb, and Ar-40/Ar-39 Geochronological Evidence |
| title_fullStr | Broad Synchroneity of Three Gold Mineralization Styles in the Kalgoorlie Gold Field: SHRIMP, U-Pb, and Ar-40/Ar-39 Geochronological Evidence |
| title_full_unstemmed | Broad Synchroneity of Three Gold Mineralization Styles in the Kalgoorlie Gold Field: SHRIMP, U-Pb, and Ar-40/Ar-39 Geochronological Evidence |
| title_short | Broad Synchroneity of Three Gold Mineralization Styles in the Kalgoorlie Gold Field: SHRIMP, U-Pb, and Ar-40/Ar-39 Geochronological Evidence |
| title_sort | broad synchroneity of three gold mineralization styles in the kalgoorlie gold field: shrimp, u-pb, and ar-40/ar-39 geochronological evidence |
| topic | Ion-Microprobe Shear Zone Age Constraints Mile Deposit Decay Constants Eastern Goldfields Superterrane Absolute Ages Yilgarn Craton Greenstone Terranes Western-Australia |
| url | http://hdl.handle.net/20.500.11937/31610 |