J4 ›› 2012, Vol. 42 ›› Issue (5): 1317-1329.

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Tectono-Thermal Events of the Northern Qaidam Margin-Southern Qilian Area, Western China

Liu Yong-jiang1, Franz Neubauer2, Li Wei-min1, Johann Genser2, Li Wei2   

  1. 1.College of Earth Sciences, Jilin University, Changchun130061;
    2.Department of Geology and Geography| University of Salzburg, Salzburg A-5020, Austria
  • Received:2012-06-30 Online:2012-09-26 Published:2012-09-26

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Abstract:

U-Pb isotopic dating of the detrital zircons from both the Cenozoic sediments in Lulehe section and the modern river sands in northern Qaidam margin show four main peak ages of ~260, ~450, 500-600, 800-900 Ma and two small peak ages of ~1.8 Ga and 2.5-2.6 Ga. Together with the previous reported isotopic dating data in the area, we concluded that the northern Qaidam margin-southern Qilian area had been suffered a relatively strong low temperature regional metamorphism during the Middle-Late Permian. The eclogite and its related rocks were uplifted and denudated to the earth surface after Pliocene. There occurred the Rodinia super continent breaking up in 800-900 Ma, fan-African regional metamorphism in 500-600 Ma and the ~450 Ma metamorphism related to the subduction and collision in the northern Qaidam margin-southern Qilian area. The major tectonothermal events occurred in the Paleozoic in the area, mainly in the 500-600 Ma and 800-900 Ma.It is suggested that the Pre-Cambrian basement of the northern Qaidam margin-southern Qilian area is similar to that of Yangtze plate but different from that of North China plate.

Key words: northern Qaidam margin, southern Qilian, detrital zircon, U-Pb dating, tectono-thermal event, tectonics

CLC Number: 

  • P548.2
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