文章摘要
刘新,李学刚,祝新友,孙雅琳,蒋昊原,蒋斌斌,王海,程细音.内蒙古白音查干锡多金属矿床成矿作用研究Ⅱ:成矿花岗斑岩年代学、地球化学特征及地质意义[J].矿产勘查,2017,8(6):981-996
内蒙古白音查干锡多金属矿床成矿作用研究Ⅱ:成矿花岗斑岩年代学、地球化学特征及地质意义
Mineralization process of the Baiyinchagan tin polymetallic deposit in Inner MongoliaⅡ:chronology of ore-bearing porphyry, geochemical characteristics and geological implications of the granite porphyry
投稿时间:2017-09-13  
DOI:
中文关键词: 白音查干  大兴安岭南段  锡多金属矿床  花岗斑岩  成矿地质体
英文关键词: tin polymetal deposit, granitic porphyry, mineralized porphyry, Baiyinchagan, southern segment of the Da Hinggan Mountains area
基金项目:中国地质调查局国家二级项目内蒙古赤峰有色金属基地综合地质调查(编号:DD20160072)及博士后科学基金项目(编号:2016M600930)联合资助。
作者单位
刘新 北京矿产地质研究院,北京 100012
中国科学院地球化学研究所矿床地球化学国家重点实验室,贵阳 550002 
李学刚 赤峰市矿业权储备交易中心,赤峰 024005 
祝新友 北京矿产地质研究院,北京 100012 
孙雅琳 北京矿产地质研究院,北京 100012
中国地质大学北京,北京 100083 
蒋昊原 北京矿产地质研究院,北京 100012
中国地质大学北京,北京 100083 
蒋斌斌 北京矿产地质研究院,北京 100012 
王海 北京矿产地质研究院,北京 100012
昆明理工大学国土资源工程学院,昆明 650093 
程细音 北京矿产地质研究院,北京 100012 
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中文摘要:
      白音查干锡多金属矿床成矿地质体为花岗斑岩,岩体发生大规模电气石化、萤石化、云英岩化、闪锌矿化、黄铁矿化蚀变。花岗斑岩为早白垩世岩浆活动的产物,锆石U-Pb年龄为(141.4±4.6)Ma,锡矿化时间与成岩时间一致。花岗斑岩经历过强烈的结晶分异演化,高Si、F,富集Cu、Pb、Zn、Sn、Ag等金属元素,富集Rb、K等大离子亲石元素和Zr、Hf、Th、U等高场强元素,亏损Ba、Sr、Ti,Rb/Sr高而Zr/Hf和Nb/Ta低,具有显著的Eu负异常和四分组效应,为A型花岗岩。花岗斑岩具有正的εHf(t)(9.67~14.27)和年轻的两阶段Hf模式年龄(127~749 Ma),源岩为显生宙新生地壳物质。花岗斑岩的形成与太平洋板块俯冲完成后的拉张背景下,软流圈物质上涌造成的下地壳物质部分熔融有关。
英文摘要:
      The mineralized granite in the Baiyinchagan tin polymetal deposit area is granite porphyry, which experienced through intense tourmalinization, fluoritization, greisenization, sphalerite and pyrite mineralization stage. The dating result of zircon U-Pb by LA-ICM-PS for three granite porphyry gave a weighted average of (141.2±4.6) Ma based on 206Pb/238U isotope measurement, which indicated the tin mineralization is related to the Late Cretaceous magmatic event. The granite porphyry is highly evolved and is characterized with high Si, F and metallic elements such as Cu, Pb, Zn, Sn and Ag. The granite porphyry is enriched in large ion lithophile elements of Rb, K and high field strength element Zr, Hf, Th, U, and has depletion of Ba, Sr, Ti elements, which resulted in a high Rb/Sr ratio and low Zr/Hf and Nb/Ta ratio. In the chondrite-normalized REE diagram, the granite porphyry has strong negative Eu anomalies and spectaular tetrad effect. All of geochemical characteristics indicate the Baiyinchagan granite porphyry is A-type granite. The high εHf(t) (9.67~14.27) and young two stages of Hf model age (127~749 Ma) indicate the granite was derived from the part melting of the newborned lower crust, which was originated from depleted mantle, initiated by the upwelling and underplating of the asthenospheric material, which related to the extension after the subduction of the paleo-Pacific plate.
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