Geochronological and geochemical constrains on petrogenesis of the Huangyangshan A-type granite from the East Junggar, Xinjiang, NW China

Geochemistry and geochronology of Carboniferous volcanic rocks in the eastern Junggar terrane, NW China: Implication for a tectonic transition

“…These characteristics are all consistent with the major predictions of a slab break-off model (von Blanckenburg and Davis, 1995;Atherton and Ghani, 2002;Keskin et al, 2008). Yang et al (2011a) suggested a slab break-off model on the basis of geochemical results for A-type granites in the study area. Yuan et al (2010) and Song et al (2011) also argued that the late Carboniferous to early Permian granites and mafic-ultramafic intrusions in the eastern and central Tianshan terrane could be linked to slab break-off.…”

“…Some researchers have suggested an early Carboniferous timing for the final closure of the Paleo-Junggar Ocean (Gao et al, 1998), whereas others argued for late Carboniferous Zhang et al, 2009a;Chen et al, 2010) or Permian (Long et al, 2006;Xiao et al, 2008;Geng et al, 2009;Tang et al, 2010a). Previous studies were mainly concentrated on the voluminous Carboniferous granitoids (Han et al, 1997;Chen and Jahn, 2004;Su et al, 2007;Geng et al, 2009;Yang et al, 2011a), and proposed several tectonic models including ridge subduction (Geng et al, 2009), slab break-off (Niu et al, 2006;Yuan et al, 2010) and the detachment of an orogenic root zone . As the granitic magmas are produced by partial melting of crustal materials, and may give ambiguous tectonic implications (Wu et al, 2007), these models need to be augmented with other petrological and geochemical data.…”

Tectonic framework of the northern Junggar Basin part I: The eastern Luliang Uplift and its link with the East Junggar terrane

“…These sedimentary rocks are overlain by predominantly terrestrial volcanic rocks of the Carboniferous Batamayineishan Formation (BS Formation) (Zhang et al, 2013). These sequences are intruded by Carboniferous I-type and A-type granites (Chen and Jahn, 2004;Han et al, 2006;Yang et al, 2011;Liu et al, 2013).…”

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

“…Xu et al, 2013). The bimodal volcanic rocks, A-type granites and molasses indicate that the ocean basin in the East and West Junggar terranes closed during the Late Carboniferous-Middle Permian (Han et al, 2006;Zhou et al, 2008;Chen et al, 2010;Yang et al, 2011). Nevertheless, recent studies on the eastern Luliang Uplift suggest that the subduction-related setting in the Junggar Basin might have continued into the Late Carboniferous as a northward subduction, which is also supported by our geophysical and geochemical data (Li et al, 2014(Li et al, , 2015, suggesting that the closure time of PAO in the Junggar Basin is likely to be later than those represented by the present peripheral mountains.…”