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Article by Wang Y
Article by Xun Z
Article by Liu Z
Article by Li S
Article by Wang S
Article by Du Y
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Formation mechanism of Baiyingaolao volcanic rocks in Wenbuqi area of Da Hinggan mountains
WANG Yang, XUN Zhong-yuan, LIU Zheng-hong, LI Shi-chao, WANG Shi-jie, DU Yang
College of Earth Sciences, Jilin University, Changchun 130061, China
Abstract: The volcanic rocks in Baiyingaolao Formation of Wenbuqi area of Da Hinggan mountains are composed of a series felsic volcanic rocks such as rhyolite and rhyolitic lithic crystal tuff. LA-ICP-MS zircon U-Pb dating results show the rhyolite formed in the Early Cretaceous, aged in (131±1.5)Ma. The geochemical study suggests that the rhyolite is characterized by high SiO2(72.43%~78.64%), Al2O3(11.48%~14.24%), and K2O(4.09%~5.05%), and low MgO(0.14%~0.34%) in contents. Samples are significant in fractionation of HREE and LREE[(La/Yb)N=8.22~13.68], with negative Eu anomalies (��Eu=0.39~0.90). The trace element are characterized evidently by enrichment of Rb, Ba, K, depletion of Nb,P,Ti. The ratios of 176Hf/177Hf vary in 0.282 830~0.282 983 and the corresponding ��Hf(t) values are positive ranging from 6.02 to 10.19. Above characteristics indicate that the volcanic rocks derived from the basic lower crust accreted from depleted mantle during Neoproterozoic. Tectonic setting is related to the extensional setting.
Keywords: Da Hinggan mountains   Baiyingaolao Formation   U-Pb dating   Wenbuqi area  
�ո����� 2017-01-11 �޻����� 2017-05-20 ����淢������  
DOI: 10.3969/j.issn.1004-5589.2017.03.007
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