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2012, 31(4) 621-630 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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Zircon U-Pb ages of Khanka Lake granitic complex and its geological implication |
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YANG Hao-1, ZHANG Yan-Long-1, CHEN Hui-Jun-2, GE Wen-Chun-1 |
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1��College of Earth Sciences��Jilin University��Changchun 130061��China; 2��Shenyang Institute of Geology and Mineral Resources��Shenyang 110034��China |
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Abstract��
Khanka Lake granitic complex is located in the southeastern margin of Jiamusi Massif��mainly composed of granodiorite��monzogranite and syenogranite�� Zircon U-Pb dating by LA-ICP-MS technique indicates that the Yangtianzhainanshan and Shuangzishan plutons were emplaced with ages of 257 ± 2 Ma and 215 ��212 Ma��respectively�� The spatial and temporal distribution of granitoids reveals that they were related to the subduction of the Paleo-Asian oceanic plate and the post-collisional extensional environment of northeastern China�� Considering other previously dating of granitic rocks��we proposed that the Jiamusi Massif and Khanka Massif commonly experienced three stages of magmatism in large scale ( the Early Paleozoic��Permian and Triassic) �� The two massifs should be considered to constitute a single crustal entity�� |
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Keywords��
Jiamusi Massif
Khanka Massif
granite
Zircon U--Pb age
geological implication
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