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2016, 35(1) 142-152 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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Formation age and tectonic setting of Yanboling and Zhudundian plutons in Tadong iron deposit��eastern Jilin Province |
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ZHOU Jing, LI Ben-Xian, LIANG Yi-Hong, YU Hong-Chao, SUN Xiao |
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College of Earth Sciences��Jilin University��Changchun 130061��China |
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Abstract��
The geochronology��geochemical characteristics and tectonic setting of Yanboling and Zhundundian plutons from Tadong iron deposit area are studied with zircon LA - -ICP - -MS dating�� Geochemical characteristics suggest that Yanboling pluton is of granodiorite and Zhundundian pluton is of granite�� The weighted mean ages of the two plutons are 262. 3 ±3. 1 Ma and 244. 5 ±1. 9 Ma��indicating the intrusions are the Late Permian to the Ear- ly Triassic in ages��respectively�� The Na 2 O/K 2 O ratios of Yanboling pluton are 1. 45 ��1. 69��A/CNK values are 0. 88 ��0. 94��while ��ittmann index σ as 2. 09 ��2. 45�� Zhundundian pluton has Na 2 O/K 2 O ratios of 0. 99 ��1. 12�� A/CNK values of 0. 902 ��1. 001����ittmann index σ as 2. 15 ��2. 55�� The geochemical features indicate that Yan- boling and Zhundundian plutons are metaluminous I- type granites and they both have the characteristics of crust source��which were producted by the subduction of the Paleo- - Asian Ocean plate�� The instrusion age of the Yanbol- ing pluton signify the Paleo- - Asian ocean not closed in ca�� 244 Ma�� |
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Keywords��
Tadong Iron Deposit
Zircon U-Pb dating
granite
Formation
eastern Jilin
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Received Revised Online: |
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