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《Mineral Deposits》 2015-04
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SHRIMP zircon U-Pb dating of country rock in Zhangmajing U-Mo deposit in Guyuan, Hebei Province, and its geological significance

WU JianHua;DING Hui;NIU ZiLiang;WU RenGui;ZHU MinQiang;GUO GuoLin;LIU Shuai;YU DaGan;State Key Laboratory Breeding Base of Nuclear Resources and Environment,East China Institute of Technology;Collage of Earth Science, East China Institute of Technology;No.243 Geological Party,CNNC;  
The Zhangmajing U-Mo deposit located near the third member of Zhangjiakou Formation where the rhyolite is in contact with rhyolite porphyry and quartz porphyry, mainly controlled by the cryptoexplosive breccias in the Guyuan-Hongshanzi uranium metallogenic belt in Guyuan, Hebei Province. The zircons in the rhyolite, rhyolite porphyry and quartz porphyry from the country rock of the Zhangmajing U-Mo deposit have clear zonal structure and high Th /U ratio, suggesting typical magmatic zircons. The results of the SHRIMP zircon U-Pb dating indicate that the 206 Pb /238 U ages of analytical points of twelve zircons from rhyolite vary in the range of 136 ~ 144 Ma with the weighted average of( 138. 6 ± 1. 4) Ma and MSWD of 1. 4, those of analytical points of eleven zircons from rhyolite porphyry vary in the range of 136 ~ 145 Ma with the weighted average of( 140. 2 ± 1. 6) Ma and MSWD of 2. 2, and those of analytical points of eleven zircons from quartz porphyry vary in the range of 132 ~ 147 Ma with the weighted average of( 136. 2 ± 2. 9) Ma and MSWD of 1. 8. Therefore, within the error range the age range of the rhyolite is in accordance with that of rhyolite porphyry and quartz porphyry, implying that the volcanic eruption and porphyry generation took place in early Early Cretaceous, in accord with the wall rocks of hydrothermal-type uranium deposits of the west Pacific metallogenic domain in age, with volcanic rocks as the ore-bearing host rocks. It is thus held that the area near the contact zone between early Early Cretaceous subvolcanic rock and synchronous volcanic rock is the favorable place in search for uranium deposits in the Guyuan-Hongshanzi uranium metallogenic belt.
【Fund】: 国家自然科学基金项目《沽源-红山子铀成矿带流纹岩-粗面岩组合的成因及其与铀成矿的关系》(批准号:41372071);; 中国核工业总公司项目《中国中-新生代铀成矿作用研究》(批准号:中核地计[2008]74号)联合资助
【CateGory Index】: P597.3;P618.65;P619.14
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