首页|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

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

扫码查看
原文链接
  • 国家科技期刊平台
  • NETL
  • NSTL
  • 万方数据
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 dikes.Diorite porphyry,quartz diorite porphyry and biotite diorite porphyry are mineral-bearing dikes,whereas granite porphyry is unrelated to gold mineralization.To 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 classification.The formation temperature of the granite porphyry(734℃)was higher than the average temperature of the other three types of dikes(704℃),whereas the former's alkalinity index(395)was lower than the average alkalinity index of the other three dikes(425).The ∑REE amount of granite porphyry(147.18 ppm)was smaller than the average ∑REE amount of the other three dikes(246.80 ppm)and itsδEu value(0.33)was larger than the average δEu 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 Triassic.Compared 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 S13.These 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.

dikeszircon morphologymulti-stage evolutionmineralization conditionsZaozigou gold deposit

LIU Jiawang、WANG Shuzhi、WANG Tao、CAO Chong、QIU Junting、XIE Fenquan

展开 >

North China University of Science and Technology,Tangshan,Hebei 063210,China

Chinese Academy of Geological Sciences,Beijing 100037,China

Beijing Research Institute of Uranium Geology,Beijing 100029,China

Bohai Rim Energy Research Institute,Northeastern Petroleum University Qinhuangdao,Hebei 066004,China

展开 >

2024

10.1111/1755-6724.15201

地质学报(英文版)
中国地质学会

地质学报(英文版)

CSTPCD
影响因子：1.414
ISSN：1000-9515
年,卷(期)：2024.98(6)