矿床地质2026，Vol.45Issue(2)：293-316,24.DOI:10.16111/j.0258-7106.2026.02.005
新疆准噶尔东北缘玉依塔斯斑岩Cu-Au-Mo矿床成岩成矿时代及成矿潜力
Geochronology and metallogenic potential of Yuyitasi porphyry Cu-Au-Mo deposit in northeastern Junggar,Xinjiang,China
摘要
Abstract
The Yuyitasi is a newly discovered,medium-sized porphyry-type Cu-Au-Mo deposit located in the northeast-ern Junggar region,with orebodies hosted by Early Devonian quartz diorite and diorite.Geochronological study was conducted on the main intrusions and strata of the district.Systematic LA-ICP-MS U-Pb dating of zircons yields ages of(426.2±1.6)Ma for tuff,(409.1±3.3)Ma for pyroxene diorite,(396.8±3.0)Ma for mineralized quartz diorite,(387.6±4.2)Ma for diorite,and(388.0±10)Ma for granite,indicating a multi-stage magmatic em-placement history.The emplacement age of the ore-bearing quartz diorite is consistent with the Re-Os age dating of molybdenite from the deposit((395.7±5.6)Ma).Geochemically,the mineralized quartz diorite is enriched in large-ion lithophile elements and depleted in high-field-strength elements,displaying a typical island-arc affinity and suggesting that the porphyry Cu-Au-Mo mineralization at Yuyitasi formed in an Early-Middle Devonian is-land-arc setting.Compositional variations among the intermediate-felsic intrusions are chiefly controlled by dif-ferent degrees of partial melting in the source.Whole-rock Dy/Yb decreases markedly with increasing SiO2,indi-cating fractional crystallization of amphibole at source area during magmatic evolution and providing a plausible explanation for the adakitic signature of the ore-forming magma.Taken together with the regional magmatic-tec-tonic framework and metallogenic conditions,these results suggest that the area surrounding the Yuyitasi still holds significant potential for discovering large porphyry Cu-Au-Mo deposits.关键词
斑岩Cu-Au-Mo矿化/LA-ICP-MS锆石U-Pb定年/辉钼矿Re-Os定年/埃达克岩/新疆Key words
porphyry Cu-Au-Mo mineralization/LA-ICP-MS zircon U-Pb dating/molybdenite Re-Os dat-ing/adakite/Xinjiang分类
天文与地球科学引用本文复制引用
朱伯鹏,沙豪,汪延泉,王瑞,王辰皓,陈鹏,陈煜,李想..新疆准噶尔东北缘玉依塔斯斑岩Cu-Au-Mo矿床成岩成矿时代及成矿潜力[J].矿床地质,2026,45(2):293-316,24.基金项目
本文得到新疆富蕴县玉依塔斯-索尔库都克一带铜金矿预查(编号:A17-3-XJ076)项目资助 （编号:A17-3-XJ076）
