title: Linking magmatism with collision in an accretionary orogen.
abstract: A compilation of U-Pb age, geochemical and isotopic data for granitoid plutons in the southern Central Asian Orogenic Belt (CAOB), enables evaluation of the interaction between magmatism and orogenesis in the context of Paleo-Asian oceanic closure and continental amalgamation. These constraints, in conjunction with other geological evidence, indicate that following consumption of the ocean, collision-related calc-alkaline granitoid and mafic magmatism occurred from 255 ± 2 Ma to 251 ± 2 Ma along the Solonker-Xar Moron suture zone. The linear or belt distribution of end-Permian magmatism is interpreted to have taken place in a setting of final orogenic contraction and weak crustal thickening, probably as a result of slab break-off. Crustal anatexis slightly post-dated the early phase of collision, producing adakite-like granitoids with some S-type granites during the Early-Middle Triassic (ca. 251-245 Ma). Between 235 and 220 Ma, the local tectonic regime switched from compression to extension, most likely caused by regional lithospheric extension and orogenic collapse. Collision-related magmatism from the southern CAOB is thus a prime example of the minor, yet tell-tale linking of magmatism with orogenic contraction and collision in an archipelago-type accretionary orogen.
authors.affiliation: Xinjiang Research Center for Mineral Resources, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China.|Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China.|Department of Geosciences, National Taiwan University, Taipei 10617, Taiwan.|Xinjiang Key Laboratory of Mineral Resources and Digital Geology, Urumqi 830011, China.
authors.forename: Shan
authors.initials: S
authors.lastname: Li
authors.affiliation: Department of Geosciences, National Taiwan University, Taipei 10617, Taiwan.|Institute of Earth Sciences, Academia Sinica, Taipei 11529, Taiwan.
authors.forename: Sun-Lin
authors.initials: SL
authors.lastname: Chung
authors.affiliation: Department of Applied Geology, Curtin University, G.P.O. Box U1987, Perth, Western Australia 6845, Australia.
authors.forename: Simon A
authors.initials: SA
authors.lastname: Wilde
authors.affiliation: Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China.
authors.forename: Tao
authors.initials: T
authors.lastname: Wang
authors.affiliation: Xinjiang Research Center for Mineral Resources, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China.|Xinjiang Key Laboratory of Mineral Resources and Digital Geology, Urumqi 830011, China.|State Key Laboratory of Lithospheric Evolution, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100029, China.
authors.forename: Wen-Jiao
authors.initials: WJ
authors.lastname: Xiao
authors.affiliation: Key Laboratory of Computational Geodynamics, University of Chinese Academy of Sciences, Beijing 100049, China.
authors.forename: Qian-Qian
authors.initials: QQ
authors.lastname: Guo