[an error occurred while processing this directive] ������� 2017, 36(2) 361-370 DOI:   10.3969/j.issn.1004-5589.2017.02.004  ISSN: 1004-5589 CN: 22-1111/P

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Zircon U-Pb geochronology, petrogeochemistry and tectonic significance of volcanic rocks from Tamulangou Formation in western Huzhong, northern Great Xing'an Range
YANG Nai-feng1, YANG Li-ting2
1. Heilongjiang Mining Group Co., Ltd, Harbin 150036, China;
2. Heilongjiang Provincial Geology and Mineral Resources Test and Application Institute, Harbin 150036, China
Abstract:

Huzhong volcanic rock belt lies in the northern part of Greater Khingan Range. Tamulangou Formation, which is one of the earlier phases of the eruption, is mainly composed of intermediate-basic volcanic rock. Zircon U-Pb dating shows that the Huzhong volcanic rock formed in the Late Jurassic (154±1 Ma). SiO2 content of Huzhong volcanic rock is 49.80%~55.96%, Al2O3 is 16.70%~18.93%, Na2O+K2O is 6.35%~9.11%, belonging to intermediate-basic high alumina alkaline rocks. The volcanic rocks are enriched in large ion lithophile elements Ba, and depleted in Nb, Ta, with Nb/Ta=12.44~15.58. The changes of Huzhong volcanic rock element contents and their ratios indicate that the basaltic magma of Tamulangou Formation is influenced by crust-derived material during fractional crystallization process. The formation was formed in the plate margin arc orogen environment related to the subduction of Paleo Asian Ocean plate and (or) Mongolia-Okhotsk Ocean plate.

Keywords: volcanic rocks   Tamulangou Formation   Mesozoic   Huzhong   northern Greater Khingan Range  
�ո����� 2016-09-29 �޻����� 2017-03-27 ����淢������  
DOI: 10.3969/j.issn.1004-5589.2017.02.004
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