Linking the Tengchong Terrane in SW Yunnan with the Lhasa Terrane in southern Tibet through magmatic correlation |
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| Institution: | 1. State Key Laboratory of Geological Processes and Mineral Resources, and School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China;2. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China;1. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Beijing 100083, China;2. Department of Geological Sciences, Indiana University, Bloomington, IN 47405, United States;1. State Key Laboratory of Continental Tectonics and Dynamics, Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;2. State Key Laboratory for Mineral Deposits Research, Department of Earth Sciences, Nanjing University, Nanjing 210046, China;3. Geological Survey of Yunnan Province, Kunming 650051, China;4. Geologisches Institut, ETH Zurich, 8092 Zurich, Switzerland;1. Department of Geosciences, University of Tübingen, Hölderlinstr. 12, 72074 Tübingen, Germany;2. Geologie, Technische Universität Bergakademie Freiberg, Bernhard-von-Cotta-Str. 2, 09599 Freiberg, Germany;3. Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Lin Cui Lu 16 Hao Yuan, Beijing 100101, China;1. State Key Laboratory of Continental Dynamics, Northwest University, Xi''an, China;2. Department of Earth Sciences, Sun Yat-Sen University, Guangzhou, China;3. College of Earth Sciences, Guilin University of Technology, Guilin 541004, China;4. Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100101, China;5. State Key Laboratory of Isotope Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;6. CSIRO Earth Sciences and Resource Engineering, Bentley, WA 6102, Australia;1. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China;2. College of Land and Mineral Resources, Kunming University of Science and Technology, Kunming 650093, China |
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| Abstract: | New zircon U–Pb data, along with the data reported in the literature, reveal five phases of magmatic activity in the Tengchong Terrane since the Early Paleozoic with spatial and temporal variations summarized as Cambrian–Ordovician (500–460 Ma) to the east, minor Triassic (245–206 Ma) in the east and west, abundant Early Cretaceous (131–114 Ma) in the east, extensive Late Cretaceous (77–65 Ma) in the central region, and Paleocene–Eocene (65–49 Ma) in the central and western Tengchong Terrane, in which the Cretaceous–Eocene magmatism migrated from east to west. The increased zircon εHf(t) of the Early Cretaceous granitoids from ? 12.3 to ? 1.4 at ca. 131–122 Ma to ? 4.6 to + 7.1 at ca. 122–114 Ma, identified for the first time in this study, and the magmatic flare-up at ca. 53 Ma in the central and western Tengchong Terrane indicate increased contributions from mantle- or juvenile crust-derived components. The spatial and temporal variations and changing magmatic compositions over time in the Tengchong Terrane closely resemble those of the Lhasa Terrane in southern Tibet. Such similarities, together with the data of stratigraphy and paleobiogeography, enable us to propose that the Tengchong Terrane in SW Yunnan is most likely linked with the Lhasa Terrane in southern Tibet, both of which experienced similar tectonomagmatic histories since the Early Paleozoic. |
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