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The Beishan orogen, located in the southern Central Asian Orogenic Belt, was formed by subduction-accretionary processes in the Paleozoic, and so provides key constraints on the current international controversy regarding the duration of the orogenesis and the time of its termination and formation of the final suture. This paper concerns the tectonic setting, in the Beishan, of Devonian volcanic and...
Five Triassic granitic plutons have been identified from the Beishan orogen by zircon U–Pb dating that defines two age groups: 240–238Ma and 225–217Ma. They belong to the high-K calc-alkaline and shoshonitic series and have alkalic and alkali-calcic characteristics, and are weakly peraluminous–metaluminous. These granitoids are mainly highly fractionated I-type granite and A-type granite. They have...
The Devonian and Carboniferous rock assemblages in Western Junggar, southern Altaids, include ophiolitic mélanges and coherent units. At Baijiantan, Yeyagou and Dagun Devonian gabbros and one group of volcanic rocks (type I lava) generally crop out as blocks in a matrix of ultramafic rocks and/or mudstone. They have a depleted light rare earth element (LREE) and mid-oceanic ridge basalt (MORB)-like...
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