Ages of sediment-hosted Himalayan Pb–Zn–Cu–Ag polymetallic deposits in the Lanping basin,China: Re–Os geochronology of molybdenite and Sm–Nd dating of calcite |
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| Institution: | 1. Department of Geology, Trinity College Dublin, Dublin 2, Ireland;2. Department of Earth Sciences, Memorial University of Newfoundland, St. John''s A1B 3X5, NL, Canada;3. Department of Earth, Ocean and Atmospheric Sciences, University of British Columbia, Vancouver V6T 1Z4, BC, Canada;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. Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;2. School of Earth and Planetary Science, John de Laeter Centre, Curtin University, Bentley 6845, Australia |
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| Abstract: | The Lanping basin is a significant Pb–Zn–Cu–Ag mineralization belt of the Sanjiang Tethyan metallogenic province in China. Over 100 thrust-controlled, sediment-hosted, Himalayan base metal deposits have been discovered in this basin, including the largest sandstone-hosted Pb–Zn deposit in the world (Jinding), and several Cu ± Ag ± Co deposits (Baiyangping, Baiyangchang and Jinman). These deposits, with total reserves of over 16.0 Mt Pb + Zn, 0.6 Mt Cu, and 7000 t Ag, are mainly hosted in Meso-Cenozoic mottled clastic rocks, and strictly controlled by two Cenozoic thrust systems developed in the western and eastern segments of the Lanping basin.To define the metallogenic history of the study area, we dated nine calcite samples associated with copper sulfides from the Jinman Cu deposit by the Sm–Nd method and five molybdenite samples from the Liancheng Cu–Mo deposit by the Re–Os method. The calcite Sm–Nd age for the Jinman deposit (58 ± 5 Ma) and the molybdenite Re–Os age for the Liancheng deposit (48 ± 2 Ma), together with previously published chronological data, demonstrate (1) the Cu–Ag mineralization in the western Lanping basin mainly occurred in three episodes (i.e., ～56–54, 51–48, and 31–29 Ma), corresponding to the main- and late-collisional stages of the Indo–Asian orogeny; and (2) the Pb–Zn–Ag (±Cu) mineralization in the eastern Lanping basin lacked precise and direct dating, however, the apatite fission track ages of several representative deposits (21 ± 4 Ma to 32 ± 5 Ma) may offer some constraints on the mineralization age. |
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| Keywords: | Mineralization epoch Calcite Sm–Nd age Molybdenite Re–Os dating Sediment-hosted Pb–Zn–Cu–Ag deposits Lanping basin China |
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