The collision between the Yili and Tarim blocks of the Southwestern Altaids: Geochemical and age constraints of a leucogranite dike crosscutting the HP–LT metamorphic belt in the Chinese Tianshan Orogen

Metasomatized lithosphere–asthenosphere interaction during slab roll-back: Evidence from Late Carboniferous gabbros in the Luotuogou area, Central Tianshan

“…Proterozoic granite gneisses have zircon U-Pb ages ranging from 948±8 to 926± 8 Ma Hu et al, 2010). Paleozoic (480-275 Ma) granitoids are widely distributed in this terrane (Dong et al, 2011;Gao et al, 2009Gao et al, , 2011Shi et al, 2007;Yang et al, 2006). Late Devonian to Late Carboniferous (>361-313 Ma, SHRIMP U-Pb zircon age) island-arc type volcanic and volcaniclastic rocks disconformably overlie Late Silurian volcanics or the Proterozoic basement (Tang et al, 2010;Zhu et al, 2009).…”

Implications from zircon-saturation temperatures and lithological assemblages for Early Permian thermal anomaly in northwest China

“…1a). Tectonic evolution of the North Xinjiang during the Paleozoic is built mainly based on geologic studies on these terranes (Gao et al, 2011;Han et al, 1997Han et al, , 2011Hu et al, 2000;Wang et al, 2006Wang et al, , 2010Xiao et al, 2009;Zhou et al, 2008 Pirajno et al (2008) and Jahn et al (2000)) and distribution of samples used for estimation of zircon saturation temperature. b: Tectonic stages in the main terranes from northern Xinjiang.…”

“…Controversy however remains as to the timing of closure of Paleo-Asia Ocean. On the one hand, intrusive relationship between Late Carboniferous-Early Permian stitching plutons or dykes and pre-Late Carboniferous syn-orogenic rocks in northern Xinjiang led to the argument that the final amalgamation of the South CAOB had been terminated by Late Carboniferous (Gao et al, 2011;Han et al, 2010Han et al, , 2011Li et al, 2006). On the other hand, Xiao et al (2009) suggested that the accretioncollision processes were finally terminated during the end-Permian to mid-Triassic based on Triassic zircon U-Pb ages from the west Tianshan eclogite and two suspected Late Permian radiolarian cherts (Xiao et al, 2009).…”

“…It is widely accepted that the South Tianshan Orogen resulted from the closure of the South Tianshan Ocean followed by the collision between the Kazakhstan-Yili terrane to the north and the Tarim craton to the south during the Late Paleozoic (Dong et al, 2011;Gao et al, 2011;Han et al, 2011). Formation of the South Tianshan Orogen is a diachronous, scissors-like process, which occurred first in the Hongliuhe region during Devonian (Zhang and Guo, 2008) and ended in the west before the Early Permian (Gao et al, 2011;Han et al, 2011).…”

“…Several important phases of igneous activities have been reported in the Tianshan Orogen and in the north Tarim Craton, i.e., the Archean, early Paleoproterozoic, Neoproterozoic and Early Permian events (Gao et al, 2011;Hu et al, 2000;Tian et al, 2010;Zhang et al, , 2010b. Amongst these igneous activities, the Early Permian phase is notable for its remarkable synchronous emplacement of ultramaficmafic-syenite complex, mafic dykes and syenite plutons (or dykes) in the Bachu region and flood basalts in the Tarim Basin and surrounding areas ( Fig.…”