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2015, 34(2) 283-295 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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Zircon U-Pb geochronology and petrogeochemistry of Luanjiahe granite in Jiaodong region and their geological significance |
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CHEN Jun, SUN Feng-Yue, WANG Li, WANG Shuo, LI Rui-Hua |
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College of Earth Sciences��Jilin University��Changchun 130061��China |
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Abstract��
Luanjiahe granite is the important rocks in Jiaodong goldfields region�� composed mainly of medium- coarse grained biotite monzonitic granites�� LA - -ICP - -MS zircon U - -Pb dating shows that the Luanjiahe granite formed in the Late Jurassic (aged in 149 ±2 Ma)�� The SiO 2 content of Luanjiahe granite is higher as 64. 58% to 72. 05%��while A/CNK is 0. 98 to 1. 22�� The granite is enriched in large ion lithophile elements (LILE) ��b�� Ba��K�� and strongly depleted in HFSE (Nb��Ta��Ti and P)�� The ��EE patterns demonstrate strong enrichment in L��EE and depletion in H��EE��and sightly positive anomaly in Eu�� The ratio of the Nb/La and Nd/Th shows char- acteristics of the crust granites�� The ratio of ��b/Sr shows possible mixture of part of the mantle source materials�� Combined with the regional geological analysis��it is suggested that the subduction of the Pacific plate to Eurasian Land triggered massive mantle- derived magma under- plating since Jurassic��led to a partial melting of crust material and the Luanjiahe granite�� |
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Keywords��
Jiaodong
Luanjiahe granite
zircon U-Pb chronology
geochemistry
tectonic environment
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