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YANG Wenlong, LI Bile, WANG Guozhi, et al. SHRIMP Zircon U-Pb Ages and Its Geological Significance of CrystalIgnimbrite in the Duocaima Pb-Zn Deposit, Tuotuohe Area[J]. Northwestern Geology, 2016, 49(2): 59-69.
Citation: YANG Wenlong, LI Bile, WANG Guozhi, et al. SHRIMP Zircon U-Pb Ages and Its Geological Significance of CrystalIgnimbrite in the Duocaima Pb-Zn Deposit, Tuotuohe Area[J]. Northwestern Geology, 2016, 49(2): 59-69.
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SHRIMP Zircon U-Pb Ages and Its Geological Significance of CrystalIgnimbrite in the Duocaima Pb-Zn Deposit, Tuotuohe Area

  • College of Earth Science, Jilin University, Changchun 130061, Jilin, China

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  • Received Date: January 15, 2015
  • Revised Date: February 26, 2016
  • Available Online: July 28, 2022
  • Published Date: June 04, 2016
    Graphical Abstract
    • Abstract
  • The DuocaimaPb-Zn deposit, is a super-large scale Pb-Zn deposit found in Tuotuohe area recently, which is located in the East Qiangtang Block of Northeast Qinghai-Tibet Plateau.Because the adverse weather conditions in this exploration area, the researches on this depositare very low, especially magmatic evolution and tectonic setting. In this paper, the zircon SHRIMP U-Pb age and geochemical compositions of crystal ignimbrites from this deposit have beentested.The zircons of crystal ignimbrite mainly show euhedral and hypidiomorphic texture, with clear ring and high Th/U ratios (0.39~0.69), which belong to the typical magmatic zircons.The dating results show that the 206Pb/238U average weighted age of these crystal ignimbrites is(254.0±2.9) Ma (MSWD=1.9), and their concordant agesare (254.0±2.9) Ma (MSWD=1.9). The geochemical data suggest that these crystal ignimbrites are enriched in large ion lithophile elements (LILE)and LREE, strongly depleted in high field-strength element (HFSE). The trace elements ratios, such as Nb/Ta ratio (7.78-8.29), showthat these crystal ignimbrites belong to arc volcanic rocks, which are derived from the crustalmaterials.Combined with regional geological information, the new geochemical and geochronology datareveal that this research area was experienced the consistent subduction stage in 254Ma±.
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