Journal of Jilin University(Earth Science Edition) ›› 2016, Vol. 46 ›› Issue (5): 1383-1405.doi: 10.13278/j.cnki.jjuese.201605110

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Dawusu Complex of Xinlin District in Northern Greater Hinggan Mountains Zircon U-Pb Chronology,Petrogeochemistry,and Its Geological Implication

Liu Yu1,2, Sun Jiapeng3, Wang Xianzhong1, Zhang Wenqiang1,2, Yang Huaben1, Liang Zhongkai1,2, Xu Liming1,2   

  1. 1. No.3 Gold Geological Party of CAPF, Harbin 150086, China;
    2. School of Earth Science and Resources, China University of Geosciences, Beijing 100083, China;
    3. College of Earth Sciences, Jilin University, Changchun 130061, China
  • Received:2015-10-11 Online:2016-09-26 Published:2016-09-26
  • Supported by:

    Supported by Geological Survey Projects of China Geological Survey(1212011220666)

Abstract:

Xinlin district located in the Tayuan-Xinlin-Xiguitu fracture where the west side of Erguna block, the east side of Xing'an block, in northern Greater Hinggan Mountains. Previous research suggests that "Wolegen Group" belongs to the orderly strata. Through field observation and comprehensive analysis, this paper considers that the strata in this area belongs to Non Smith stratigraphic unit by a plurality of tectonic block stacked and collaged, that experienced many times of metamorphic deformation. This paper conducted detrital zircon LA-ICP-MS U-Pb dating on matrix and rock mass of Dawusu complex in Xinlin district. The test results show that the magmatic crystallization age of rock mass in the spilite is (477.3±2.7)Ma,and the minimum peak age of metamorphic quartz sandstone in the matrix is 468 Ma, limiting the deposition time of Early Ordovician. Then, the two granite of local district dating results for 300 Ma, the paper considers that the Dawusu complex is actually a set of Non Smith stratigraphy that age from the Early Ordovician to Late Carboniferous,by based on the literatures and combined with the structural characteristics of the area. Geochemical characteristics show that the the content of SiO2 in ophiolite fragments is low, and it belongs to calc-alkaline or basalt of tholeiite series; The plots of chondrite-normalized REE patterns shows that Eu element is no abnormal or weak positive anomaly; The plots of primitive mantle-normalized trace element patterns shows that the oceanic crust is enriched in Nb,Ta,Zr and other large ion lithophile elements, depleted in Ba,K, Sr and other high field strength element. And it can be speculated that the nature of oceanic crust of the ocean formed in the area,the spilite-keratophyre and intermediate-basic volcanic rock formed in the island arc, and the sandy muddy turbidite formed in the fore-arc during Xinglong-Huma back-arc basin further stretching process.

Key words: northern Greater Hinggan Mountains, Xinlin district, Dawusu complex, zircon U-Pb dating, petrogeochemistry, fore-arc environment

CLC Number: 

  • P588

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