矿床地质2023，Vol.42Issue(6)：1159-1174,16.DOI:10.16111/j.0258-7106.2023.06.005
新疆西天山阔库确科铁铜矿区成矿岩体锆石微量元素地球化学特征及其地质意义
Zircon trace element geochemical characteristics and geological significance of ore forming rocks in Kuokuqueke iron copper ore district,western Tianshan,Xinjiang
摘要
Abstract
The Late Paleozoic Boluokenu island arc belt,located at the northern margin of the West Tianshan Moun-tain,Xinjiang Autonomous Region,China,hosts abundant mineral resources and intermediate-acid intrusions.In this paper,the trace element geochemistry of zircons from ore related intrusions in the Kuokuqueke skarn type iron-copper deposit in the central part of the island arc belt has been studied,and the genesis,physical and chemi-cal conditions of zircon formation and its implications for mineralization have been identified.The data shows that zircon in syenogranite and diorite closely related to mineralization is enriched in heavy rare earth elements and depleted in light rare earth elements.The ∑REE of zircon in syenogranite is(627～1625)×10-6,the ∑REE of zircon in diorite is(345～1439)×10-6.The Ti zircon thermometer shows that the crystallization temperature of zir-con in syenogranite is concentrated in range of 598～810℃,and the crystallization temperature of zircon in diorite is concentrated in range of 651～932℃,and the oxygen fugacity of syenogranite(ΔFMQ +4.25)is significantly higher than diorite(ΔFMQ-1.01).The zircons of the ore-forming rocks were formed in a closed magmatic sys-tem,mainly magmatic zircons.A small amount of zircons in diorite may have been transformed by LREE en-riched hydrothermal in the late magmatic period.The Ce4+/Ce3+values of zircons from ore-forming rocks are sig-nificantly higher than those from non ore-forming rocks in the region.Among them,the higher Ce4+/Ce3+values in zircons from syenogranite indicate that there may be greater Cu mineralization potential in the skarns formed by contact metasomatism between the Silurian strata and syenogranite in the Kuokuqueke ore district.关键词
锆石微量元素/氧逸度/成矿岩体/博罗科努成矿带/新疆西天山Key words
zircon trace elements/oxygen fugacity/ore-forming intrusions/Boluokenu island arc belt/west-ern Tianshan Mountain分类
天文与地球科学引用本文复制引用
顾枫华,章永梅,彭义伟,王佳琳..新疆西天山阔库确科铁铜矿区成矿岩体锆石微量元素地球化学特征及其地质意义[J].矿床地质,2023,42(6):1159-1174,16.基金项目
本文得到国家自然科学基金项目(编号:42202094、42130804)资助 （编号:42202094、42130804）
