Gondwanan magmatism with adakite-like signature linked to Cu (Mo)-porphyry deposits from the San Rafael Massif,Mendoza Province,Argentina |
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| Affiliation: | 1. MOE Key Laboratory of Orogenic Belts and Crustal Evolution, School of Earth and Space Sciences, Peking University, Beijing 100871, China;2. Department of Earth Science, Durham University, Durham DH1 3LE, UK;3. Department of Applied Mathematics, Research School of Physics and Engineering, Australian National University, Canberra, ACT 0200, Australia;1. Institute of Earth Sciences, Academia Sinica, Taipei 11529, Taiwan;2. Department of Geosciences, National Taiwan University, Taipei 10617, Taiwan;3. Department of Geology, University of Birjand, Birjand, Iran;4. State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China;1. Department of Geology and Earth Environmental Sciences, Chungnam National University, Daejeon 34134, South Korea;2. Ochang Center, Korea Basic Science Institute, Ochang, Chungbuk 28119, South Korea;1. School of Earth Sciences and Resources, China University of Geosciences, Beijing 100082, PR China;2. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, PR China;3. Laboratory of Department of Thermal Engineering, Tsinghua University, Beijing 100084, PR China |
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| Abstract: | The gondwanan magmatism in the San Rafael Massif, known as Choiyoi Magmatic Cycle, was emplaced during the inception of a magmatic arc setting during the early Permian. Two different sections can be differentiated in this volcanic sequence. The lower section (∼281 up to ∼265 Ma) consisting of andesites and dacitic to low-silica rhyolitic ignimbrites has geochemical characteristics that indicate a subduction zone setting. The upper section (∼265 up to ∼252 Ma) composed of rhyolitic ignimbrites and lava flows, dacitic to rhyolitic subvolcanics and alkalic basaltic andesites has geochemical characteristics transitional between subduction and continental intraplate settings. Several Cu–(Mo) porphyry deposits are genetically linked to the lower section (Infiernillo, San Pedro and La Chilca-Zanjón del Buitre). In this paper, we discussed the petrogenesis of the magmatism linked to the porphyry deposits from the San Rafael Massif. The petrogenetic analysis suggests that the lower section was produced in a thickened crust resulting in an adakite-like signature magmatism. The U/Pb LA-ICP-MS age of magmatic zircons from an intrusive associated to the San Pedro porphyry (263.1 ± 4.2 Ma) allowed confirming that the emplacement of Cu–Mo porphyry deposits in the San Rafael Massif occurred during the change in the geodynamical conditions from a transpressive to a transtensive tectonic regime. |
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| Keywords: | Gondwanan magmatism Adakite-like signature Cu-porphyry San Rafael Massif Argentina |
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