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2016, 35(1) 40-50 DOI:
ISSN: 1004-5589 CN: 22-1111/P |
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Zircon U-Pb geochronology and petrogeochemistry of Early Cretaceous Xintian Quartz Diorite in Yanbian area��Jilin Province |
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WANG Chao, SUN Feng-Yue, CHEN Guang-Jun, PENG Bo, YU Liang, ZHAO Tuo-Fei |
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1. College of Earth Science��Jilin University��Changchun 130061��China; 2. Wangqing Huaxin Mining Co. ��LTD��Wangqing 133212��Jilin��China |
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Abstract��
The study of the zircon U- Pb age and petrogeochemistry of Xintian quartz diorite in Yanbian area is reported in this paper�� The weighted average age of zircon LA -ICP - MS U - Pb dating for the quartz diorite is 139 ±2 Ma��indicating that it was generated in the Early Cretaceous�� Geochemical characteristics of the diorte indicate of peraluminous high - - K calc- alkaline�� The rocks have low ��EE contents��and are relatively enriched in light rare earth (L��EE)��with obvious fractionation of L��EE and H��EE��and weak negative Eu anomalies�� They are en- riched in large ion lithophile elements (��b��Ba��Sr) and incompatible elements (U��Th)��relatively depleted in high field strength elements (Nb��Ta��P��Zr��Hf��Ti)��and the trace element ratios are similar to the average value of the crust��suggesting a parent magma sourced within the lower crust�� Based on the geochemical data and the regional geological background��we propose that the Xintian quartz diorite formed in active continental margin environment related to the subduction of the Paleo- Pacific Plates�� The Early Cretaceous was an important subduc- tion stage with strong intermediate- acid magmatic emplacement activities�� |
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Keywords��
zircon U- Pb geochronology
petrogeochemistry
Xintian quartz diorite
Yanbian area
Jilin Province
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Received Revised Online: |
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