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Article by Zhang H
Article by Zhang X
Article by Zeng Z
Article by Liu Y
Article by Cui W
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Geochronological and geochemical characteristics of Neoarchean basement under Conozoic basalt in Changbai Mountain
ZHANG Hong-tao, ZHANG Xing-zhou, ZENG Zhen, LIU Yang, CUI Wei-long
College of Earth Sciences, Jilin University, Changchun 130061, China
Abstract: The LA-ICPMS zircon U-Pb geochronological and geochemical analysis for granitic rocks and amphibolite gneiss exposed sporadically in the Quaternary basalt coverage area of Changbai Mountain show that the zircon U-Pb age of granitic rocks and amphibolite gneiss are 2 509~2 558 Ma and 2 475~2 553 Ma, respectively. Geochemically, both granitic rocks and amphibolite gneiss belong to tonalite-trondhjemite-granodiorite series (TTG). The REE pattern exhibits rightward sloping with significant fractionation of light rare earth elements (LREE) and heavy rare earth elements (HREE) (LREE/HREE=3.85~34.48). Muscovite monzonitic granite displays slightly negative Eu anomalies (��Eu=0.41~0.54), enrichment of Rb, K, Th and strongly negative Nb, Sr, P, Ti anomalies. Biotite hornblende plagiogneiss shows negative Eu anomalies (��Eu=0.67~0.76), enrichment of Rb, K, La, Nd and depletion of Th, Nb, Sr, P, Yb. Granitic gneiss and biotite plagiogneiss display slightly negative to positive Eu anomalies (��Eu=0.87~3.3), enrichment of Rb, K, Sr and depletion of Nb, Th and P. Their geochronological and geochemical characteristics are similar to relevant rocks of the Baishan and Helong massifs, indicating the Baishan Block and Helong Block are the same block (Longgang block) during Late Archaean. Current distribution patterns of Baishan and Helong blocks are the results of reworking by the NE-trending left-lateral faults afterwards.
Keywords: Quaternary basalt   Neoarchean basement   Helong block   Baishan block  
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DOI: 10.3969/j.issn.1004-5589.2017.03.011
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