Zircon U–Pb dating and the petrological and geochemical constraints on Lincang granite in Western Yunnan,China: Implications for the closure of the Paleo-Tethys Ocean |
| |
| Institution: | 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. School of Earth Science and Geological Engineering, Sun Yat-Sen University, Guangzhou 510275, China;2. CAS Center for Excellence in Tibetan Plateau Earth Sciences, Beijing 100101, China;3. Department of Earth Sciences, University of St Andrews, North Street, St Andrews KY169AL, UK;4. Department of Geological Sciences, Faculty of Science, Chiang Mai University, Chiang Mai 50200, Thailand;5. State Key Laboratory of Geological Processes and Mineral Resources, Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China;1. Department of Earth Sciences, University of Oxford, Oxford OX1 3AN, United Kingdom;2. NERC Isotope Geosciences Laboratory, British Geological Survey, Nottingham NG12 5GG, United Kingdom;3. Department of Geological Sciences, Chiang Mai University, Thailand;4. PPT Exploration and Production, Vibhavadi-Rangsit Road, Soi 11, Bangkok 10900, Thailand;5. Swedish Museum of Natural History, and Nordic Center for Earth Evolution, Box 50007, SE-104 05 Stockholm, Sweden;1. Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, United Kingdom;2. Department of Geology, Chiang Mai University, Thailand;3. Swedish Museum of Natural History, and Nordic Center for Earth Evolution, Box 50007, SE-104 05 Stockholm, Sweden;4. NERC Isotope Geosciences Laboratory, British Geological Survey, Keyworth, Nottingham NG12 5GG, United Kingdom;1. School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China;2. The Beijing SHRIMP Center, Institute of Geology, Chinese Academy of Geological Sciences, Beijing, 102206, China;3. Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China |
| |
| Abstract: | Lincang granite is a batholith located in the Sanjiang region and is an important research subject for understanding subduction and collision during the Paleo-Tethyan period. It is widely exposed in the Lincang Terrane and extends south into Burma. Based on various petrological and geochemical investigations performed from south to north across the Lincang granite, a new set of data, which includes zircon chronological and Hf isotopic data, is presented to discuss the origin of the Lincang granite and its tectonic significance. The Lincang granite is a peraluminous, high-K calc-alkaline body with sub-parallel REE patterns and a strong negative Eu anomaly. This anomaly is characteristic of a post-collision peraluminous S-type granitic batholith. The 200–230 Ma formation age of the Lincang granite was determined using LA-ICP-MS zircon U–Pb dating. Thus, it has been confirmed that the granite formed during the late Triassic period, and the formation process lasted for approximately 30 Ma. Geochemical and isotopic compositions indicate that the primary magma of Lincang granite most likely originated from a crustal source, and possibly underwent an assimilation–fractionation crystallization (AFC) process during its emplacement. The Lincang granite formed during the continental collision between the Baoshan–Gengma Terrane and the Lanping–Simao Terrane after the northeast subduction of the Paleo-Tethyan Oceanic Plate. Therefore, the late Triassic Lincang granite is important evidence for the closure of the Paleo-Tethyan Ocean. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
