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东秦岭地区碳酸岩型钼-铀多金属矿床成矿时代:来自LA-ICP-MS独居石U-Pb和辉钼矿Re-Os年龄的证据
投稿时间:2019-08-19  修订日期:2019-12-04  点此下载全文
引用本文:
DOI:10.19762/j.cnki.dizhixuebao.2020035
摘要点击次数: 173
全文下载次数: 295
作者单位E-mail
王佳营 中国地质调查局天津地质调查中心 cugwjy@qq.com 
李志丹 中国地质调查局天津地质调查中心 cugcug@qq.com 
张祺 中国地质调查局天津地质调查中心  
李超 国家地质实验测试中心  
谢瑜 中国地质调查局天津地质调查中心  
李光耀 中国地质调查局天津地质调查中心  
曾威 中国地质调查局天津地质调查中心  
丁宁 中国地震局第一监测中心  
中文摘要:东秦岭地区碳酸岩型钼-铀多金属矿床主要包括华阳川铀多金属矿、黄龙铺和黄水庵钼矿等。其中,华阳川矿床为近期取得勘查突破的一例以U、Nb、Pb为主并伴生稀土元素的超大型铀多金属矿床;黄龙铺钼矿为东秦岭钼矿带中成矿类型最为独特的大型钼矿床。为了精确获得东秦岭地区碳酸岩型钼-铀多金属成矿时代,本研究采用辉钼矿Re-Os法和LA-ICP-MS独居石U-Pb法,分别对黄龙铺大石沟矿床的辉钼矿、秦岭沟矿床和华阳川矿床含矿碳酸岩脉中的独居石进行测定。结果表明,黄龙铺地区大石沟钼矿辉钼矿Re–Os等时线年龄为221.3±8.4Ma(MSWD=10.9);秦岭沟钼矿碳酸岩中独居石LA-ICP-MS Tera-Wasserburg年龄为207±11Ma(MSWD=3.7, n=38),华阳川铀多金属矿LA-ICP-MS独居石Tera-Wasserburg年龄为222.5±6.7Ma(MSWD=1.8, n=37),表明该地区碳酸岩中的钼矿化和铀多金属矿化均形成于晚三叠世。综合分析认为,东秦岭地区发育于碳酸岩中的黄龙铺钼矿田、华阳川铀多金属矿是同一成矿系列的产物,碳酸岩型钼-铀多金属的成矿金属可能来源于地幔,这类碳酸岩可能是秦岭地区印支期造山后伸展环境下的产物。
中文关键词:碳酸岩型矿床  辉钼矿Re-Os年龄  独居石U-Pb定年  华阳川  东秦岭
 
Metallogenic Epoch of Carbonatite-type Mo-U Polymetallic Deposit in East Qinling: Evidences from the Monazite LA-ICP-MS U-Pb and Molybdenite Re-Os Isotopic Dating
Author NameAffiliationE-mail
Wang Jiaying Tianjin Center, China Geological Survey cugwjy@qq.com 
LI Zhidan Tianjin Center, China Geological Survey cugcug@qq.com 
ZHANG Qi Tianjin Center, China Geological Survey  
LI Chao National Research Center of Geoanalysis  
XIE Yu Tianjin Center, China Geological Survey  
LI Guangyao Tianjin Center, China Geological Survey  
ZENG Wei Tianjin Center, China Geological Survey  
DING Ning The First Monitoring and Application Center, China Earthquake Administration  
Abstract:The carbonatite-type Mo-U polymetallic deposits in eastern Qinling are mainly composed of Huayangchuan U polymetallic deposit, Huanglongpu Mo deposit and Huangshuian Mo deposit. The Huayangchuan is a super-large U-Nb-Pb deposit accompanying rare-earth elements, and the Huanglongpu is a unique Mo deposit with large scale in the eastrn Qinling molybdenum belt. In this paper, we use molybdenite Re-Os dating and LA-ICP-MS monazite U-Pb dating to precisely determine the timing of the carbonate-type Mo-U polymetallic mineralization in eastrn Qinling. The Re-Os dating of molybdenite samples from Dashigou Mo deposit yields a Re-Os isochron age of 221.3±8.4 Ma. The LA-ICP-MS monazite U–Pb dating in carbonate dyke from the Qinlinggou Mo deposit and the Huayangchuan U polymetallic deposit yielded Tera-Wasserburg concordant ages of 207±11Ma (MSWD=3.7, n=38) and 222.5±6.7Ma (MSWD=1.8, n=37), respectively. These ages show that U polymetallic and Mo mineralization in carbonates were formed in Late Triassic. In conclusion, the Huanglongpu Mo orefield and Huayangchuan U polymetallic deposit which occurred in carbonatites were formed in the same mineralization series. The ore-forming materials of carbonatite-type Mo-U polymetallic deposit may derived from the mantle, and the carbonatites may be the products of the post-orogenic extensional setting in the Qinling Orogenic Belt.
keywords:Carbonatite-type deposit, Re-Os dating of molybdenite, monazite LA-ICP-MS U–Pb dating, Huayangchuan, East Qinling
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