2013
DOI: 10.1080/00206814.2013.818804
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40Ar–39Ar age and geochemistry of subduction-related mafic dikes in northern Tibet, China: petrogenesis and tectonic implications

Abstract: 40Ar- 39 Ar age and geochemistry of subduction-related mafic dikes in northern Tibet, China: petrogenesis and tectonic implications, International Geology Review, 56:1, 57-73,The early Permian Xiaomiao mafic dike swarm in the East Kunlun orogenic belt (EKOB) provides an excellent opportunity to study the petrogenesis of such swarms developed in supra-subduction zone environments, and to investigate the early plate tectonic history of the Palaeo-Tethyan Ocean. Hornblende 40 Ar-39 Ar dating results indicate t… Show more

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Cited by 61 publications
(20 citation statements)
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“…These features indicate that the Palaeo‐Tethyan Ocean was still subducting during the Late Permian–Early Triassic. This is further supported by the Late Carboniferous mid‐ocean ridge basalts (308 Ma; Yang et al, ), the Early Permian subduction‐related mafic dyke swarm (277.76 ± 2.72 Ma; Liu et al, ) and A‐type syenogranite (Peng et al, ), Middle Permian flysch sediments (Li, Ji, et al, ), subduction‐related unconformity between Upper and Middle Permian rocks (Figure ; Li, Ji, et al, ; Li et al, ; Zhang et al, ), Late Permian active continental margin marine molasses (Li, Pei, et al, ; Yang et al, ), 260–255 Ma island arc volcanic rocks (Jiang et al, ; Shi et al, ; Yang, Xu, Li, & Shi, ) and 263–249 Ma subduction‐related granitoids and lamprophyres (Figure ; Chen, Gehrels, et al, ; Chen, Wang, et al, ; Xiong et al, ; Xiong et al, ; Xiong et al, ; Zhang et al, ).…”
Section: Discussionmentioning
confidence: 89%
“…These features indicate that the Palaeo‐Tethyan Ocean was still subducting during the Late Permian–Early Triassic. This is further supported by the Late Carboniferous mid‐ocean ridge basalts (308 Ma; Yang et al, ), the Early Permian subduction‐related mafic dyke swarm (277.76 ± 2.72 Ma; Liu et al, ) and A‐type syenogranite (Peng et al, ), Middle Permian flysch sediments (Li, Ji, et al, ), subduction‐related unconformity between Upper and Middle Permian rocks (Figure ; Li, Ji, et al, ; Li et al, ; Zhang et al, ), Late Permian active continental margin marine molasses (Li, Pei, et al, ; Yang et al, ), 260–255 Ma island arc volcanic rocks (Jiang et al, ; Shi et al, ; Yang, Xu, Li, & Shi, ) and 263–249 Ma subduction‐related granitoids and lamprophyres (Figure ; Chen, Gehrels, et al, ; Chen, Wang, et al, ; Xiong et al, ; Xiong et al, ; Xiong et al, ; Zhang et al, ).…”
Section: Discussionmentioning
confidence: 89%
“…Recent research on the Late Palaeozoic magmatic rocks within the EKO area indicates that the early Permian Xiaomiao mafic dykes (~278 Ma) formed in a supra‐subduction zone setting (Liu et al ., ), whereas the magmatic rocks that were emplaced or erupted in the EKO area between 278 and 241 Ma were most likely the result of subduction zone magmatism (Xiong et al ., ). In addition, U–Pb zircon dating of monzonitic granite related to subduction in the Aikedelesite region, located in the southern EKO, yielded an igneous crystallization age of 268.7 ± 1.6 Ma (Yang et al ., ), indicating that the southern part of the EKO was also the site of subduction at this time.…”
Section: Discussionmentioning
confidence: 94%
“…Data for 277-245Ma intermediate-basic pluton are form (Xiong Fuhao et al, 2011;Xiong et al, 2012Xiong et al, , 2013Xiong et al, , 2014Huang et al, 2014;Liu et al, 2014); Data for 245-240Ma intermediate-basic pluton are form (Li Bile et al, 2012;Zhang et al, 2012;Xia et al, 2015b), respectively (the same below). Apr.…”
Section: Zircon U-pb Datingmentioning
confidence: 99%
“…Consequently, the QSG is considered to be the product of partial melt mantle owing to the northward subduction of the Buqingshan-A'nyemaqen oceanic crust. There are many granitic rocks of 277 Ma-240 Ma, including many MMEs with the characteristics of islandarc magmatic rocks (Yuan Wanming et al, 2000;Sun Yu et al, 2009;Feng Chengyou et al, 2012;Dai et al, 2013;Li Zuochen et al, 2013;Chen Guochao, 2014;Liu et al, 2014;Luo Mingfei et al, 2014Xia et al, , 2015aChen et al, 2015;Li et al, 2015). However, the period of 240 Ma-230 Ma is devoid of magmatism in the area and syncollisional intrusive rocks are scarce Xia Rui et al, 2014;Xiong et al, 2014;Chen Guochao and Pei Xianzhi, to be published).…”
Section: Tectonic Settingmentioning
confidence: 99%
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