A Late Carboniferous–Early Permian slab window in the West Junggar of NW China: Geochronological and geochemical evidence from mafic to intermediate dikes

Late-Paleozoic emplacement and Meso-Cenozoic reactivation of the southern Kazakhstan granitoid basement

“…Choulet et al, 2011Choulet et al, , 2012Choulet et al, , 2013G. Yang et al, 2014;Geng et al, 2011;Shen et al, 2013b;Tang et al, 2010;Yin et al, 2010Yin et al, , 2013Zhou et al, 2008). The Carboniferous (~350-311 Ma) crystallization ages obtained in this study for the Kazakh West Junggar and neighboring mountain ranges, are likely related to this arc magmatism.…”

“…Wang et al, 2009). In the Chinese West Junggar, transition from a Carboniferous subductionaccretion setting to a Permian post-accretion setting transpired around 305-300 Ma (Choulet et al, 2012(Choulet et al, , 2013Gao et al, 2014;Geng et al, 2009Geng et al, , 2011Tang et al, 2010;Yin et al, 2013;Zhou et al, 2008). Between~300-250 Ma, alkaline magmatism and A-type granites dominated with minor calc-alkaline and I-type granites in an overall post-collisional setting with major strike-slip deformation and associated extensional-transtensional tectonics (Chen and Jahn, 2004;Choulet et al, 2011Choulet et al, , 2012Choulet et al, , 2013Tang et al, 2010;Zhang et al, 2008;Zhou et al, 2008).…”

Geochemistry, zircon U–Pb ages and Lu–Hf isotopes of early Paleozoic plutons in the northwestern Chinese Tianshan: Petrogenesis and geological implications

“…It is suggested that mantle-derived components or juvenile crust have played an important role in the generation of these granitoids in Central Asia Jahn et al, 2000Jahn et al, , 2004Sengör et al, 1993;Windley et al, 2007). Based on recent Hf and Nb isotopic studies, several important crustal growth events were proposed to have occurred in various parts of the CAOB during the Phanerozoic, namely at 280-306 Ma, 315-306 Ma and 345-463 Ma (Cai et al, , 2011Geng et al, 2009;Lei et al, 2011;Su et al, 2012;Sun et al, 2008;Tang et al, 2010bTang et al, , 2012aWang et al, 2011b;Xu et al, 2010;Yin et al, 2010Yin et al, , 2013Yuan et al, 2007;Zhang et al, 2012;and this study).…”

“…Middle Ordovician fossils from the sequence suggest that the Jungar Ocean likely subducted to the north in the middle Ordovician (Zhu et al, 2007). More recent studies on the late Paleozoic intrusive and volcanic rocks in the West Junggar indicate that the northward subduction of the Junggar Ocean occurred at least prior to the late Paleozoic (Long et al, 2006;Tang et al, 2010bTang et al, , 2012bXiao et al, 1992;Yin et al, 2013;Zhu et al, 2007Zhu et al, , 2008. The early Paleozoic Tangbale ophiolite and flysch in the West Junggar suggest a middle Ordovician active continental margin (Zhu et al, 1984(Zhu et al, , 1987.…”

Petrogenesis of a Late Carboniferous mafic dike–granitoid association in the western Tianshan: Response to the geodynamics of oceanic subduction

“…Most recently, a mantle plume model has been invoked to account for the Tianshan and Junggar mafic dikes, because the mafic dikes purportedly formed in the Early Permian (290-260 Ma), coeval with the Tarim large igneous province (Zhang and Zou, 2013 Ar dating results indicate that mafic dikes in the west Junggar and Tianshan regions formed during the Late Carboniferous (~320-305 Ma) (Feng et al, 2012;Tang et al, 2012b;Yin et al, 2010Yin et al, , 2013 and are unequivocally older than the Early Permian (275 Ma) Tarim large igneous province (Wei et al, 2014). In addition, the geochemical characteristics of the Zhongyangchang mafic dikes are distinct from those of the Tarim Early Permian basalts and mafic dikes (Fig.…”