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A Comparative Study of Ore-bearing Dikes and a Barren Dike in the Zaozigou Gold Deposit,Western Qinling:Zircon Morphology,U-Pb Chronology and Geochemical Constraints

引用

Acta Geologica Sinica(English Edition) 2024年第6期98卷 1489-1500页

作者： LIU Jiawang WANG Shuzhi WANG Tao CAO Chong QIU Junting XIE Fenquan North China University of Science and Technology TangshanHebei 063210China Chinese Academy of Geological Sciences Beijing 100037China Beijing Research Institute of Uranium Geology Beijing 100029China Bohai Rim Energy Research Institute Northeastern Petroleum UniversityQinhuangdaoHebei 066004China

The Zaozigou gold deposit lies south of the Xiahe-Hezuo regional fault zone in the western Qinling orogenic belt and contains many intermediate to felsic *** porphyry,quartz diorite porphyry and biotite diorite porphyry are mineral-bearing dikes,whereas granite porphyry is unrelated to gold *** compare the relationship between different dikes and mineralization,this study analyzed the cathodoluminescence(CL)of zircon crystals in all four types of dikes exposed in the Zaozigou deposit,using a zircon typological *** formation temperature of the granite porphyry(734°C)was higher than the average temperature of the other three types of dikes(704°C),whereas the former’s alkalinity index(395)was lower than the average alkalinity index of the other three dikes(425).TheΣREE amount of granite porphyry(147.18 ppm)was smaller than the averageΣREE amount of the other three dikes(246.80 ppm)and itsδEu value(0.33)was larger than the averageδEu values of the other three dikes(0.30).The U-Pb ages of zircon in the four types of dikes were relatively consistent with the crystallization ages of approximately 240 Ma,which indicates that all four types of dikes intruded in the Middle *** to the other three ore-bearing dikes,the morphology of the zircon crystals in the barren dikes evolved from S13 to S5 and then returned to *** results indicate that the barren dike underwent an increase in temperature and a decrease in alkalinity,which may be an important reason for the absence of mineralization.

关键词： dikes zircon morphology multi-stage evolution mineralization conditions Zaozigou gold deposit

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