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2014, 33(2) 311-321 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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LA--ICP--MS zircon U--Pb ages and geochemical characteristics of Amuwu pluton in Sonid Zuoqi area��Inner Mongolia |
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GUO Zhi-Tao, SUN Jia-Peng, LIANG Yi-Hong, ZOU Cun-Ming, SUN Xiao, ZHOU Jing, YU Hong-Chao, ZHAO Dong-Ming |
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1. College of Earth Sciences��Jilin University��Changchun 130061��China; 2. Jilin Tianchi Mining Industry Company��Ltd. ��Helong 133500��Jilin��China |
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Abstract��
The zircon U--Pb ages and geochemical characteristics of Amuwu pluton in Sonid Zuoqi area were determined by the method of LA--ICP--MS zircon U--Pb dating as well as major��trace and ��EE elements analysis�� The results showed that the 206Pb/238U age was 235. 1 ±3. 2 Ma��formed in Middle Triassic�� The granite was char- acterized by high SiO2and K2O��low CaO and TiO2��strongly depleted in Sr��Ba��Ti��P��and enriched in K����b�� Th�� The pluton showed particularly intensive Eu negative anomalies and with a seagull shape to rightward in chon- drite-normalized ��EE pattern�� The A/CNK and A/NK values were 0. 77 ��1. 193 and 1. 26 ��1. 64��respectively�� belonging to A-type granite�� According to the high Y/Nb value (2. 31 ��3. 00 ��1. 2)��the pluton shows the charac- teristics of granite type A2��which formed in the extensional environment of post-orogenic�� |
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Keywords��
Amuwu pluton
Sonid Zuoqi
A-type granite
zircon U--Pb ages
geochemistry
Inner Mongolia
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Received Revised Online: |
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