Thermochronological and geochemical footprints of post-orogenic fluid alteration recorded in apatite: Implications for mineralisation in the Uzbek Tian Shan |
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| Affiliation: | 1. Department of Earth Sciences, School of Physical Sciences, The University of Adelaide, SA-5005, Australia;2. Saint Petersburg State University, 7/9 University Embankment, SPb-199034, Russia;3. Novosibirsk State University, 2 Pirogova St., Novosibirsk 630090, Russia;4. State Committee of the Republic of Uzbekistan on Geology and Mineral Resources, Tashkent, Uzbekistan;5. delaide Microscopy, The University of Adelaide, SA-5005, Australia;6. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;7. Xinjiang Research Centre for Mineral Resources, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China;8. Laboratory for Mineralogy and Petrology, Department of Geology, Ghent University, 281-S8 Krijgslaan, Ghent 9000, Belgium;1. School of Physical Sciences, University of Adelaide, Adelaide, SA 5000, Australia;2. School of Chemical Engineering, University of Adelaide, Adelaide, SA 5000, Australia;3. BHP Billiton, Olympic Dam, Adelaide, SA 5000, Australia;1. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;2. University of Chinese Academy of Sciences, Beijing 100049, China;3. Department of Geological Sciences, Indiana University, Bloomington, IN 47405, USA;1. Centre for Tectonics, Resources, and Exploration (TRaX, Department of Earth Sciences, The University of Adelaide, 5005, Australia;2. Saint Petersburg State University, 7/9 University Embankment, SPb 199034, Russia;3. Novosibirsk State University, 2 Pirogova St., Novosibirsk 630090, Russia;4. State Committee of the Republic of Uzbekistan on Geology and Mineral Resources, Tashkent, Uzbekistan;5. John de Laeter Centre, TIGeR, School of Earth and Planetary Sciences, Curtin University, Perth, 6846, Australia |
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| Abstract: | The Uzbek Tian Shan is a prominent metal-rich belt, hosting world-class orogenic Au deposits such as Muruntau. However, its post-collisional history in relation to fluid alteration and mineralisation remains elusive. We present apatite U–Pb dates and rare earth element geochemistry for 44 granitoids, revealing a prolonged history of low-grade metamorphism and associated fluid alteration between ~285 and ~240 Ma. A resulting apatite U–Pb age interpolation map reveals two young anomalies that are interpreted as post-orogenic fluid circulation cells. In addition, the extent of Meso-Cenozoic denudation is presented using apatite fission track (FT) age data. In areas of good data coverage, the combined Apatite U–Pb and FT anomalies reveal a correlation with the locations of orogenic Au mineralisation. Although more data is required to further evaluate such correlation, our study illustrates that integrated multi-method apatite thermochronology and geochemistry may have the potential to become a novel viable tool for mineral exploration. |
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