摘要
苏云河钼矿是中亚造山带内西准噶尔地区的超大型斑岩型钼矿床,赋矿岩体为侵入至中泥盆统巴尔鲁克组火山碎屑岩的二长花岗斑岩和花岗斑岩.围绕苏云河钼矿含矿岩体开展了详细的岩石学、地球化学、同位素与年代学研究,发现:(1)苏云河二长花岗斑岩、花岗斑岩与花岗闪长斑岩的形成时代为294~302 Ma,矿区斑岩的形成与后续矿化可能是连续的岩浆-热液演化过程;(2)苏云河二长花岗斑岩、花岗斑岩与花岗闪长斑岩可能是同源岩浆不同程度结晶分异的结果,主微量元素均显示出相关性耦合变化,且具有一致的Sr-Nd-Hf同位素组成;(3)矿区岩体富集Rb、U、Th、Nd和Hf,亏损Ba、Nb、Ti和P,显示出后碰撞花岗岩的地球化学特征;(4)较高的Sr含量(平均为202.41×10^(-6))与Sr/Y比值(平均为14.97)、中等的ε_(Nd)(t)值(+3.8~+6.0),以及较高的锆石ε_(Hf)(t)值(+9.7~+15.6)指示苏云河矿区岩体岩浆主要源于新生幔源物质与少量古老地壳物质的熔融混合.
The Suyunhe molybdenum deposit is a super large porphyry deposit located in the western Junggar region within the Central Asian Orogenic Belt.The mineralized rocks are monzogranite porphyry and granodiorite porphyry that intruded into the volcaniclastic rock of the Devonian Barluk Formation.In this paper,it reports a detailed study on the petrography,elemental and isotope geochemistry,and geochronology of mineralized rocks from the Suyunhe molybdenum deposit.The results reveal follows.(1)The monzogranite porphyry,granite porphyry,and granodiorite porphyry formed between 294 and 302 Ma as a result of prolonged magmatic-hydrothermal evolution that resulted in mineralization.(2)The monzogranite porphyry,granite porphyry,and granodiorite porphyry are thought to have originated from a common magma source,undergoing varying degrees of crystallization differentiation.This is evidenced by the correlated variations in their major and trace element contents,as well as their uniform Sr-Nd-Hf isotopic signatures.(3)These granitoids are enriched in Rb,U,Th,Nd,and Hf and depleted in Ba,Nb,Ti,and P,exhibiting geochemical characteristics of granites in a post-collisional setting.(4)Elevated Sr content(averaging 202.41×10^(-6))along with a high Sr/Y ratio(averaging 14.97),moderateε_(Nd)(t)values(+3.8 to+6.0),and high zirconε_(Hf)(t)values(+9.7 to+15.6)suggest that the magma from the Suyunhe mineral district primarily originated from the melting and mixing of juvenile mantle materials with a minor proportion of ancient crustal materials.
作者
游军
吴楚
洪涛
焦鹏利
徐兴旺
You Jun;Wu Chu;Hong Tao;Jiao Pengli;Xu Xingwang(Shaanxi Center of Mineral Geological Survey,Xi'an 710068,China;Shaanxi Institute of Geological Survey,Xi'an 710068,China;Development and Research Center of China Geology Survey,Beijing 100037,China;Guangdong Provincial Key Laboratory of Geodynamics and Geohazards,School of Earth Sciences and Engineering,Sun Yat-sen University,Guangzhou 510275,China;Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai),Zhuhai 519082,China;State Key Laboratory of Lithospheric and Environmental Coevolution,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China;College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《地球科学》
北大核心
2025年第4期1284-1304,共21页
Earth Science
基金
国家自然科学基金面上项目(No.42272075)
国家自然科学基金青年项目(No.42302083)
国家自然科学基金原创探索项目(No.42250202)
第二次青藏高原综合科学考察研究(No.2019QZKK0806)
广东省引进人才创新创业团队项目(No.2021ZT09H399)
自然科学基金重大研究计划集成课题(No.92162323)。
作者简介
游军(1985-),男,高级工程师,主要从事矿床地球化学研究和新一轮找矿突破战略行动技术支撑工作.ORCID:0000-0002-2794-4760.E-mail:351851028@qq.com;通讯作者:吴楚(1989-),男,高级工程师,E-mail:wuchu@mail.cgs.gov.cn;通讯作者:洪涛(1989-),男,副教授,E-mail:hongt5@mail.sysu.edu.cn。
