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2015, 34(4) 903-913 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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Geological implications of Permian Fangshan granitic rocks in eastern Jiamusi Massif: evidences from U- - Pb chronology and geochemistry |
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PU Jian-Bin, ZHANG Xing-Zhou, GUO Ye, ZENG Zhen, FU Qiu-Lin, ZHANG Hong-Tao, LIU Yang |
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College of Earth Sciences��Jilin University��Changchun 130061��China |
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Abstract��
Zircon LA- - ICP- -MS U- -Pb dating results and the whole rock geochemistry of Fangshan granite in the eastern Jiamusi Massif are reported�� The formation age and geodynamics setting of these granitic rocks are iden- tified�� Zircons from Fangshan granite rocks are euhedral- subhedral in shap��and display distinctly oscillatory zon- ing structures�� The values of Th/U are 0. 26 �� 1. 16��indicating a typical magmatic origin�� The dating results show that the granitic rocks formed in the Early Permian (278 Ma��277 Ma)�� The geochemical characteristics of Fangshan granite are weakly peraluminous and high in K calc alkaline series�� These rocks are rich in L��EE and large lithophile elements (��b and K) and depleted in H��EE and high field strength elements (Nb��Ta��P��Zr and Ti)��with Eu anomalies�� The geochemical characteristics of the Fangshan granitic rocks are similar to the gra- nitic rocks from the eastern Jiamusi Massif (e. g. Meizuo��Qingshan��Chushan��Chaihe��Shichang and Jinshan)�� representing a feature of volcanic arc granite (VAG)�� Combining with the regional research data��we deduce that the eastern margin of the Jiamusi Massif was active contenental margin during the Early Permian�� |
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Keywords��
Jiamusi Massif
Permain
active contenental margin
subduction
granite
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Received Revised Online: |
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