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2015, 34(2) 312-320 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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Geochemical characteristics and tectonic significance of two Late Triassic plutons in Chenming area��Heilongjiang |
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ZOU Cun-Ming, LIANG Yi-Hong, FENG Jian, GUO Zhi-Tao, ZHOU Jing |
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1. College of Earth Sciences��Jilin University��Changchun130061��China; 2. Institute of Geology and Mineral ��esources of Liaoning Province��Shenyang110000��China |
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Abstract��
Using zircon LA-ICP-MS dating and petrological geochemical methods��the authors study the geo-chronology��geochemical characteristics and tectonic setting of Yuejincun and Yuntoulazi plutons in Chenming area�� Heilongjiang�� The zircon LA-ICP-MS dating for Yuejincun and Yuntoulazi plutons are 213 ± 3 Ma and 209 ± 3 Ma��respectively��belonging to the middle of Late Triassic�� The Yuejincun pluton is composed mainly of quartz monzonite��which belongs to aluminous��calc- alkaline series and I- type granites�� Their ��EE models are character- ized by enrichment in L��EE and depletion in H��EE�� The Yuntoulazi pluton is composed mainly of alkali feldspar granite��which belongs to aluminous��alkaline series and A- type granites�� Their ��EE models are characterized by enrichment in L��EE��LILE and depletion in H��EE��HFSE�� The characteristics indicate that these two plutons could have formed during the Hercynian to Indosinian period of transition from an orogenic setting to a post- colli- sional extension�� |
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Keywords��
Chengming area
Late Triassic
zircon U-Pb
quartz monzonite
alkali feldspar granite
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Received Revised Online: |
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