安徽地质2025，Vol.35Issue(4)：289-293,301,6.
宁芜盆地向山铁硫矿深部侵入岩的锆石U-Pb定年:对玢岩成矿系统时限的约束
Zircon U-Pb dating of deep intrusive rocks in the Xiangshan iron-sulfur deposit in the Ningwu Basin:temporal constraints on the porphyrite mineralization system
摘要
Abstract
The Ningwu Basin represents a critical concentration zone of iron-sulfur deposits in the middle-lower Yangtze River metallogenic belt and serves as the birthplace of porphyry iron ore mineralization theory.Precise dating of diagenesis and metallogeny of porphyrite deposits holds significant implications for deciphering mineralization mechanisms.The Xiangshan iron-sulfur deposit,a typical porphyrite deposit in this region,features a newly discovered magnetite ore body in its deep section.This study systematically documents the geological characteristics of this ore body,demonstrating its integral relationship with shallow pyrite deposits to form a complete porphyrite iron ore mineralization system.Zircon LA-MC-ICPMS U-Pb dating was conducted on ore-bearing diorite porphyrite and post-mineralization syenite porphyry,yielding crystallization ages of(131.1±0.7)Ma and(128.9±2.5)Ma,respectively.These results constrain the newly identified iron ore body's formation age to 128.9～131.1 Ma,aligning perfectly with the regional porphyrite iron ore mineralization event triggered by～130 Ma magmatism.关键词
宁芜盆地/向山铁硫矿/玢岩铁矿/锆石U-Pb定年/成岩成矿时代Key words
Ningwu Basin/Xiangshan iron-sulfur deposit/porphyrite iron ore/zircon U-Pb dating/diagenetic and metallogenic ages分类
天文与地球科学引用本文复制引用
钱祥,张舒,杨超,费振正,张嵩松,吴明安,胡召齐..宁芜盆地向山铁硫矿深部侵入岩的锆石U-Pb定年:对玢岩成矿系统时限的约束[J].安徽地质,2025,35(4):289-293,301,6.基金项目
国家重点研发计划子课题"庐枞和宁芜地区火山岩型富铁矿找矿模式和增储示范工程"(编号:2022YFC2903703-4)和安徽省地质勘查基金项目"马鞍山市向山南-大甸塘地区铁矿普查"(编号:2021-续3)联合资助 （编号:2022YFC2903703-4）
