Late Paleozoic calc-alkaline to shoshonitic magmatism and its geodynamic implications, Yuximolegai area, western Tianshan, Xinjiang

Geochronology, geochemistry and geodynamic implications of the Late Mesozoic volcanic rocks in the southern Great Xing’an Mountains, NE China

“…In addition, the La/Sm and La/Yb ratios of the volcanic rocks are 3.93-6.72 and 9.80-16.1, respectively, which demonstrate that all the calc-alkaline and shoshonitic rocks were originated by the batch partial melting of spinel and garnet peridotite (e.g., Genc and Tuysuz, 2010;Yang et al, 2012). The partial melting curves that coincide with the compositions of the volcanic rocks imply <10% partial melting of an enriched mantle source based upon La abundance and La/Sm ratios (Fig.…”

Geochemistry of primary-carbonate bearing K-rich igneous rocks in the Awulale Mountains, western Tianshan: Implications for carbon-recycling in subduction zone

“…1b). The K-rich igneous rocks in the Yuximolegai region are mainly composed of basaltic trachyandesite and trachyandesite (Yang et al, 2012), whereas the K-rich igneous rocks from south Yuximolegai are trachybasalt and basaltic trachyandesite (Sun et al, 2008). Combined with the globular carbonate hosted in the Bugula K-rich igneous rocks, calcite veins associated with Cu (Au)-mineralization in Yuximolegai, Chagangnuoer and Wulangdaban from both eastern and western sections of the Awulale Mountains (Fig.…”

“…Late Paleozoic igneous rocks formed during the subduction of the Tianshan oceanic plate subduction northward under the Kazakhstan-Yili plate are widely distributed in the western Tianshan along the southwestern margin of the CAOB (Gao et al, 2009;Xiao et al, 2010;Wang et al, 2011;Yang et al, 2012). The occurrence of Carboniferous-Permian potassic and ultrapotassic igneous rocks associated with Cu-(Au) mineralization in the Awulale Mountains has been interpreted to be the result of a fundamental shift of geodynamic setting associated with the termination of subduction Pirajno et al, 2011;Yang et al, 2012;Xiao et al, 2013).…”

“…The occurrence of Carboniferous-Permian potassic and ultrapotassic igneous rocks associated with Cu-(Au) mineralization in the Awulale Mountains has been interpreted to be the result of a fundamental shift of geodynamic setting associated with the termination of subduction Pirajno et al, 2011;Yang et al, 2012;Xiao et al, 2013). Generally, the Awulale Mountains can be divided into two sections based on the regional lithology.…”

“…2e and f), which are consistent with a primary of magmatic origin. Chen et al, 2004;Sun et al, 2008;Zhao et al, 2009;Zhu et al, 2009;Yang et al, 2012).…”