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NIU Yan-hong, WANG Xing, LI Xu-dong, et al. Geochemistry, LA-ICP-MS Zircon U-Pb Dating and Geological Significance of Middle Cambrian Monzogranite in Yichun, Heilongjiang Province[J]. Geological Survey of China, 2015, 2(6): 26-33.
Citation: NIU Yan-hong, WANG Xing, LI Xu-dong, et al. Geochemistry, LA-ICP-MS Zircon U-Pb Dating and Geological Significance of Middle Cambrian Monzogranite in Yichun, Heilongjiang Province[J]. Geological Survey of China, 2015, 2(6): 26-33.

Geochemistry, LA-ICP-MS Zircon U-Pb Dating and Geological Significance of Middle Cambrian Monzogranite in Yichun, Heilongjiang Province

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  • Received Date: March 18, 2015
  • LA-ICP-MS zircon U-Pb age of 504.1±5.4Ma was obtained for the fine-medium grained monzogranite from southern Yichun, which suggests the monzogranite formed in Middle Cambrian. Geochemical data for the monzogranite reveal K2O+Na2O contents of 7.41%~8.70%, K2O/Na2O ratios of 1.80%~2.28%,and low TFeO abundances, indicating it belongs to shoshonite to high K calc-alkaline series. While A/CNK>1.1 suggests peraluminous feature of S-type granite. Trace element geochemistry of the monzogranite also shows LILE enrichment and HFSE depletion. Most of the samples are concentrated on syn-collision and late orogenic tectonic settings in R1-R2 diagram, fall into syn-collision and post-collision settings in Rb- Hf -Ta diagram, plot into areas of volcanic arc and syn-collision in Nb-Y diagram, and cluster in syn-collision setting in Rb- (Y+Nb) diagram. Based on above-stated petrological and geochemical data it is inferred that the monzogranite of Yichun might be derived from a syn-collision setting, the Jiamusi and Songnen massifs amalgamated together in Middle Cambrian, and the amalagamation may be responsible for the crustal derived syn-collisional granites.
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