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New zircon U–Pb ages, mineral chemical data, whole-rock geochemistry and Sr–Nd isotopes from the potassium-rich intrusions in the Yunnan area, SW China, were determined to provide constraints on the uplift of the Eastern Tibetan Plateau. The intrusive rocks consist of shoshonitic syenites (high-Mg syenites, low-Mg syenites and syenite porphyries) and potassic granitoids (granite porphyries). Zircon...
To constrain the Phanerozoic crustal evolution of the Dunhuang Block, new whole-rock geochemistry, zircon U–Pb ages and Hf isotopic data were determined for three Paleozoic granitic plutons in the northern Altyn Tagh, northwest China. Zircon U–Pb dating of these plutons, including gneissic granite, mylonitic granite and augen gneiss, yielded Middle Devonian to Early Carboniferous crystallization ages...
Mesozoic intrusions, including MORB-type gabbros, high-Mg diorites, calc-alkaline diorites and granodiorites, were exposed in the Ando microcontinent that is bounded between the Qiangtang and Lhasa terranes. Discoveries of these Mesozoic intrusions have provided new petrogenetic constraints on our understanding of Bangong-Nujiang ocean evolution. Zircon U–Pb dating shows that these intrusions formed...
Extensive Permian mafic–ultramafic intrusions crop out within the Central Asian Orogenic Belt (CAOB). Because the magmatic activity is spatially and temporally associated with the Tarim Large Igneous Province (LIP), a mantle plume has been invoked to explain the petrogenesis of these mafic–ultramafic rocks. In order to test this hypothesis, we present new geochronological and geochemical data for...
Granitoid magmatism is extensively developed in the Altai Superterrane, but the timing of magmatic events is not so well determined. In this study, twelve granitoid intrusions from Southwest Mongolia were dated by the zircon U–Pb method and analyzed for zircon Hf isotopic compositions. The new age data indicated three phases of magmatic emplacement: Middle Paleozoic (398–350Ma), Late Paleozoic (317–289Ma)...
Dunhuang Block is previously considered to be an eastern part of the Tarim Craton, but now it is proposed to be the western extension of the Alxa Block of the NCC as a result of displacement along the Altyn Tagh fault. The oldest basement rocks of the Dunhuang Block, named Aketashitage Complex, were mainly exposed in the northern Altyn Tagh. Migmatites of the Aketashitage Complex are sodic and subalkaline...
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