The exhumation history of collision-related mineralizing systems in Tibet: Insights from thermal studies of the Sharang and Yaguila deposits, central Lhasa
The large, newly discovered Sharang porphyry Mo deposit and nearby Yaguila skarn Pb–Zn–Ag (–Mo) deposit reside in the central Lhasa terrane, northern Gangdese metallogenic belt, Tibet. Multiple mineral chronometers (zircon U–Pb, sericite 40Ar–39Ar, and zircon and apatite (U–Th)/He) reveal that ore-f...
| Main Authors: | , , , , , , , , |
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| Format: | Journal Article |
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Elsevier Science BV
2015
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| Online Access: | http://hdl.handle.net/20.500.11937/17274 |
| _version_ | 1848749420955303936 |
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| author | Zhao, J. Qin, K. Li, G. Cao, M. Evans, Noreen McInnes, Brent Li, J. Xiao, B. Chen, L. |
| author_facet | Zhao, J. Qin, K. Li, G. Cao, M. Evans, Noreen McInnes, Brent Li, J. Xiao, B. Chen, L. |
| author_sort | Zhao, J. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | The large, newly discovered Sharang porphyry Mo deposit and nearby Yaguila skarn Pb–Zn–Ag (–Mo) deposit reside in the central Lhasa terrane, northern Gangdese metallogenic belt, Tibet. Multiple mineral chronometers (zircon U–Pb, sericite 40Ar–39Ar, and zircon and apatite (U–Th)/He) reveal that ore-forming porphyritic intrusions experienced rapid cooling (>100 °C/Ma) during a monotonic magmatic–hydrothermal evolution. The magmatic–hydrothermal ore-forming event at Sharang lasted ~6.0 Myr (~1.8 Myr for cooling from N900 to 350 °C and ~4.0 Myr for cooling from 350 to 200 °C) whereas cooling was more prolonged during ore formation at Yaguila (~1.8 Myr from >900 to 500 °C and a maximum of ~16 Myr from >900 to 350 °C). All porphyritic intrusions in the ore district experienced exhumation at a rate of 0.07–0.09 mm/yr (apatite He ages between ~37 and 30 Ma). Combined with previous studies, this work implies that uplift of the eastern section of the Lhasa terrane expanded from central Lhasa (37–30 Ma) to southern Lhasa (15–12 Ma) at an increasing exhumation rate. All available geochronologic data reveal that magmatic–hydrothermal–exhumation activities in the Sharang–Yaguila ore district occurred within four periods of magmatism with related mineralization. Significant porphyry-type Mo mineralization was associated with Late Cretaceous–Eocene felsic porphyritic intrusions in the central Lhasa terrane, resulting from Neotethyan oceanic subduction and India–Asia continental collision. |
| first_indexed | 2025-11-14T07:20:40Z |
| format | Journal Article |
| id | curtin-20.500.11937-17274 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T07:20:40Z |
| publishDate | 2015 |
| publisher | Elsevier Science BV |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-172742017-09-13T15:42:03Z The exhumation history of collision-related mineralizing systems in Tibet: Insights from thermal studies of the Sharang and Yaguila deposits, central Lhasa Zhao, J. Qin, K. Li, G. Cao, M. Evans, Noreen McInnes, Brent Li, J. Xiao, B. Chen, L. Magmatic–hydrothermal Yaguila skarn Pb–Zn–Ag (–Mo) deposit Sharang porphyry Mo deposit Thermal history Tibet Sericite 40Ar–39Ar Zircon U–Pb Zircon and apatite (U–Th)/He The large, newly discovered Sharang porphyry Mo deposit and nearby Yaguila skarn Pb–Zn–Ag (–Mo) deposit reside in the central Lhasa terrane, northern Gangdese metallogenic belt, Tibet. Multiple mineral chronometers (zircon U–Pb, sericite 40Ar–39Ar, and zircon and apatite (U–Th)/He) reveal that ore-forming porphyritic intrusions experienced rapid cooling (>100 °C/Ma) during a monotonic magmatic–hydrothermal evolution. The magmatic–hydrothermal ore-forming event at Sharang lasted ~6.0 Myr (~1.8 Myr for cooling from N900 to 350 °C and ~4.0 Myr for cooling from 350 to 200 °C) whereas cooling was more prolonged during ore formation at Yaguila (~1.8 Myr from >900 to 500 °C and a maximum of ~16 Myr from >900 to 350 °C). All porphyritic intrusions in the ore district experienced exhumation at a rate of 0.07–0.09 mm/yr (apatite He ages between ~37 and 30 Ma). Combined with previous studies, this work implies that uplift of the eastern section of the Lhasa terrane expanded from central Lhasa (37–30 Ma) to southern Lhasa (15–12 Ma) at an increasing exhumation rate. All available geochronologic data reveal that magmatic–hydrothermal–exhumation activities in the Sharang–Yaguila ore district occurred within four periods of magmatism with related mineralization. Significant porphyry-type Mo mineralization was associated with Late Cretaceous–Eocene felsic porphyritic intrusions in the central Lhasa terrane, resulting from Neotethyan oceanic subduction and India–Asia continental collision. 2015 Journal Article http://hdl.handle.net/20.500.11937/17274 10.1016/j.oregeorev.2014.09.026 Elsevier Science BV restricted |
| spellingShingle | Magmatic–hydrothermal Yaguila skarn Pb–Zn–Ag (–Mo) deposit Sharang porphyry Mo deposit Thermal history Tibet Sericite 40Ar–39Ar Zircon U–Pb Zircon and apatite (U–Th)/He Zhao, J. Qin, K. Li, G. Cao, M. Evans, Noreen McInnes, Brent Li, J. Xiao, B. Chen, L. The exhumation history of collision-related mineralizing systems in Tibet: Insights from thermal studies of the Sharang and Yaguila deposits, central Lhasa |
| title | The exhumation history of collision-related mineralizing systems in Tibet: Insights from thermal studies of the Sharang and Yaguila deposits, central Lhasa |
| title_full | The exhumation history of collision-related mineralizing systems in Tibet: Insights from thermal studies of the Sharang and Yaguila deposits, central Lhasa |
| title_fullStr | The exhumation history of collision-related mineralizing systems in Tibet: Insights from thermal studies of the Sharang and Yaguila deposits, central Lhasa |
| title_full_unstemmed | The exhumation history of collision-related mineralizing systems in Tibet: Insights from thermal studies of the Sharang and Yaguila deposits, central Lhasa |
| title_short | The exhumation history of collision-related mineralizing systems in Tibet: Insights from thermal studies of the Sharang and Yaguila deposits, central Lhasa |
| title_sort | exhumation history of collision-related mineralizing systems in tibet: insights from thermal studies of the sharang and yaguila deposits, central lhasa |
| topic | Magmatic–hydrothermal Yaguila skarn Pb–Zn–Ag (–Mo) deposit Sharang porphyry Mo deposit Thermal history Tibet Sericite 40Ar–39Ar Zircon U–Pb Zircon and apatite (U–Th)/He |
| url | http://hdl.handle.net/20.500.11937/17274 |