岩矿测试

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文章摘要
松权衡,邢树文,张勇,李超,王岩,于城.吉林长安堡钼(铜)矿床成矿时代及物质来源:来自辉钼矿Re-Os同位素证据[J].岩矿测试,2016,35(5):550-557
SONG Quan-heng,XING Shu-wen,ZHANG Yong,LI Chao,WANG Yan,YU Cheng.Origin and Geochronology of Chang'anpu Mo-Cu Deposit in Jilin Province: Constraints from Molybdenite Re-Os Isotope Systematics[J].Rock and Mineral Analysis,2016,35(5):550-557.DOI:10.15898/j.cnki.11-2131/td.2016.05.014
吉林长安堡钼(铜)矿床成矿时代及物质来源:来自辉钼矿Re-Os同位素证据
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Origin and Geochronology of Chang'anpu Mo-Cu Deposit in Jilin Province: Constraints from Molybdenite Re-Os Isotope Systematics
投稿时间:2016-07-29  修订日期:2016-09-15
DOI:10.15898/j.cnki.11-2131/td.2016.05.014
中文关键词: 辉钼矿  Re-Os同位素测年  中侏罗世  长安堡钼(铜)矿床  吉林中部
英文关键词: molybdenite  Re-Os isotopic dating  middle Jurassic  Chang'anpu Mo-Cu deposit  central Jilin Province
基金项目:中央级公益性科研院所基本科研业务费专项资金(K1503);国土资源部成矿作用与资源评价重点实验室开放基金(ZS1404);中国地质调查局项目(12120113090100,1212011085530,DD20160100)
作者单位E-mail
松权衡 吉林省地质调查院, 吉林 长春 130061  
邢树文 中国地质调查局, 北京 100037  
张勇 国土资源部成矿作用与资源评价重点实验室, 中国地质科学院矿产资源研究所, 北京 100037 yongzhangcc@163.com 
李超 国家地质实验测试中心, 北京 100037  
王岩 国土资源部成矿作用与资源评价重点实验室, 中国地质科学院矿产资源研究所, 北京 100037  
于城 吉林省地质调查院, 吉林 长春 130061  
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中文摘要:
      吉林省中东部地区地处中国东北部陆缘、兴蒙造山带的东段,目前已探明大中型钼矿床十余座,矿床类型有斑岩型、矽卡岩型和石英脉型。长安堡斑岩型钼(铜)矿床是吉林中部地区新发现的一座大型斑岩型矿床,成矿年代学研究工作至今尚未开展。本文在矿床地质特征研究的基础上,对矿区辉钼矿进行了Re-Os同位素体系的定年研究,获得辉钼矿模式年龄值为167.3±2.4~168.7±2.4 Ma,加权平均值为168.0±1.0 Ma(MSWD=0.16),等时线年龄为168.0±6.2 Ma(MSWD=0.42),表明长安堡钼(铜)矿床形成于中侏罗世,属中国北方燕山期大规模钼成矿期成矿,结合已发表的钼矿床高精度年代学数据,认为吉林中东部地区的钼成矿作用发生在早-中侏罗世(167~196 Ma)。矿区辉钼矿的Re含量介于25.17~34.80 μg/g,平均值为29.54 μg/g,指示了成矿物质具有壳幔混源、且更偏壳源特征,为准确认识该矿床的成矿物质来源提供了进一步的制约。这些成果对于研究吉林地区钼矿资源的成矿规律提供了科学依据。
英文摘要:
      The east-central part of Jilin Province, located on the continental margin of northeast China along the eastern Xing-Meng orogenic belt, hosts more than 10 large- and medium-scale Mo deposits. The major types of mineralization include porphyry, skarn, and quartz vein types. The Chang'anpu Mo-Cu deposit is a newly discovered large-scale porphyry deposit in central Jilin Province; the age of mineralization is unknown. The geological characteristics of the deposit were investigated and molybdenite Re-Os isotope dating was applied, to constrain the age of mineralization. The molybdenite Re-Os model ages range from 167.3±2.4 to 168.7±2.4 Ma with a weighted mean model age of 168.0±1.0 Ma. The isochron age is 168.0±6.2 Ma, which indicates that the Chang'anpu Mo-Cu deposit was formed in the Middle Jurassic, belonging to the large-scale Yanshanian molybdenum metallogenic period of North China. The Re content of the molybdenite varies from 25.17 to 34.80 μg/g, suggesting that the ore-forming materials may come from a crust-mantle mixed source and mainly from the crustal source. Combining published molybdenite Re-Os and zircon U-Pb ages in east-central Jilin Province, suggests that the Mo mineralization occurred in the Early-Middle Jurassic (167-196 Ma), thereby providing a scientific basis for Mo resources prospecting in Jilin.
主管单位: 中国科学技术协会
主办单位: 中国地质学会岩矿测试技术专业委员会
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