Paleomagnetic study of Late Paleozoic rocks in the Tacheng Basin of West Junggar (NW China): Implications for the tectonic evolution of the western Altaids

Tectonic framework of the northern Junggar Basin Part II: The island arc basin system of the western Luliang Uplift and its link with the West Junggar terrane

“…In addition, a relatively complete record of Lower Permian strata (P 1 j-Jiamuhe Formation and P 1 f-Fengcheng Formation) was preserved in the piedmont sag (Mahu Sag) of the West Junggar terrane, and becomes progressively thick toward the West Junggar terrane, with an eastward migration of the basin depoceter (Fig. 15), supporting the interpretation that the West Junggar ocean was shrinking and closed during this period (Li et al, 2015-a,b;Yi et al, 2015). The onlapped phenomenon of Lower Permian strata toward the Xiayan High potentially suggests that an earlier uplift occurred in the western Luliang Uplift, indicating that the Luliang arc had been accreted into the Wulungu terrane in the Early Permian.…”

Late Silurian–early Devonian adakitic granodiorite, A-type and I-type granites in NW Junggar, NW China: Partial melting of mafic lower crust and implications for slab roll-back

“…Moreover, continent-continent collision and post-collision extensional settings are not supported by thefollowing geological evidence: (1) in NW Junggar there were mainly marine volcanic and clastic rocks from Silurian Shaerbuer Formation (S 2 s) to the Devonian Mangkelu Formation (D 1 m), and Carboniferous Lasite Formation (C 1 l), which is a suite of marine volcanic rocks intercalated with pillow basalts and radiolarian bedded cherts (XBGMR, 1986); (2) geotectonic reconstructions show that the Paleo-Asian Ocean was still in existence during the middle Paleozoic (Xiao et al, 2010); (3) a paleomagnetic study shows that the Junggar Ocean and Irtysh-Zaysan Ocean consumed continuously beneath the Boshchekul-Chingiz arc in the late Carboniferous (Filippova and Bush, 2001; Windley et al, 2007;Abrajevitch etal., 2008;Yi et al, 2015); (4) paleogeographic data suggest that West Junggar was in a deep sea environment in the late Carboniferous(Wang, 2006;Xiao et al, 2014b); (5) the A 2 -type granites were generated synchronously with the adakitic granodiorites(Wang et al, 2013 and this study). The above lines of evidence strongly indicate that West Junggar was in a subduction-dominated setting instead of a continent-continent collision or a post-collision extensional setting during the late Silurian-early Devonian.…”

Thermochronological constraints on the late Paleozoic tectonic evolution of the southern Chinese Altai

“…The formation of such an orogenic belt involved the episodic accretion of island arcs, ophiolites, accretionary complexes, seamounts and micro-continental blocks along the continental margin (Khain et al, 2002;Buslov et al, 2004;Xiao et al, 2004;Zhang et al, 2011), oroclinal bending (Abrajevitch et al, 2008;Xiao et al, 2010;Yi et al, 2013) and the final collision of the Siberian, Baltic, Tarim and North China cratons (S ßengör et al, 1993;Xiao et al, 2003;Windley et al, 2007;Eizenhöfer et al, 2014). The mechanism of accretionary orogenesis has been controversial, and may have involved the strikeslip duplication and oroclinal bending of a single arc system (S ßengör et al, 1993;S ßengör and Natal'in, 1996) or the amalgamation of multiple arc systems (Windley et al, 2007;Xiao et al, 2010).…”