Evolution of the Altaid tectonic collage and Palaeozoic crustal growth in Eurasia

Overlapping Sr–Nd–Hf–O isotopic compositions in Permian mafic enclaves and host granitoids in Alxa Block, NW China: Evidence for crust–mantle interaction and implications for the generation of silicic igneous provinces

“…It is noted that almost all the Nd isotopic compositions from granitoids are unradiogenic and ε Nd (t) values are negative in the Alxa SIP (Dan et al, 2014a and this study), unlike the prevalent positive ε Nd (t) values or zircon ε Hf (t) from typical granitoids of other crustal growth settings, such as accretionary orogens (CAOB, Jahn et al, 2000;Sengör et al, 1993) and mafic large igneous provinces (Emeishan, Xu et al, 2008;Zhong et al, 2011). The reason is that the underplated mafic rocks in the mid-to-lower crust are mostly generated by partial melting of ancient metasomatized lithospheric mantle in the Alxa SIP (Dan et al, submitted for publication), unlike the plume-derived or asthenosphere-derived mafic rocks in the accretionary orogenesis and mafic large igneous provinces.…”

Exhumation of the Dahinggan Mountains, NE China from the Late Mesozoic to the Cenozoic: New evidence from fission-track thermochronology

“…1a). Since the Late Paleozoic, it has undergone long-term plate subduction and continent-arc and/or microcontinent-continent collisions before the ultimate collision between the North China-Mongolian Block and the Siberian Craton (Zhao et al, 1990(Zhao et al, , 1994Sengör et al, 1993;Van der Voo et al, 1999;Xiao et al, 2003;Jia et al, 2004;Li, 2006). Consequently, widespread Phanerozoic granitoids were formed in NE China and along the north margin of North China Block (Wu et al, 2000(Wu et al, , 2003(Wu et al, , 2005Jahn et al, 2001;Sun et al, 2001;Meng, 2003;Hong et al, 2004).…”

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

“…1a). It is a major part of the southwestern Central Asian Orogenic Belt (CAOB) Sengör et al, 1993;Windley et al, 2007;Xiao et al, 2004). It mainly consists of microcontinents, ophiolite and mélange belts, continental island arcs, and remnant seamounts and oceanic plateaus, accreted together between the Neoproterozoic and late Paleozoic (Gao et al, 1998;Xiao et al, 2008).…”