首页|Petrogenesis and tectonic implications of the Silurian adakitic granitoids in the eastern segment of the Qilian Orogenic Belt,Northwest China
Petrogenesis and tectonic implications of the Silurian adakitic granitoids in the eastern segment of the Qilian Orogenic Belt,Northwest China
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Geodynamic mechanism responsible for the generation of Silurian granitoids and the tectonic evolution of the Qilian orogenic belt remains controversial.In this study,we report the results of zircon U-Pb age,and sys-tematic whole-rock geochemical data for the Haoquangou and Liujiaxia granitoids within the North Qilian orogenic belt and the Qilian Block,respectively,to constrain their petrogenesis,and the Silurian tectonic evolution of the Qilian orogenic belt.Zircon U-Pb ages indicate that the Haoquangou and Liujiaxia intrusions were emplaced at 423±3 Ma and 432±4 Ma,respectively.The Hao-quangou granodiorites are calc-alkaline,while the Liuji-axia granites belong to the high-K calc-alkaline series.Both are peraluminous in composition and have relatively depleted Nd isotopic[εNd(t)=(-3.9-+0.6)]charac-teristics compared with regional basement rocks,implying their derivation from a juvenile lower crust.They show adakitic geochemical characteristics and were generated by partial melting of thickened lower continental crust.Post-collisional extensional regime related to lithospheric delamination was the most likely geodynamic mechanism for the generation of the Haoquangou granodiorite,while the Liujiaxia granites were generated in a compressive setting during continental collision between the Qaidam and Qilian blocks.
Silurian adakitic granitoidsPetrogenesisTectonic settingQilian Orogenic Belt
万方数据
维普
