内蒙古吉源南铌铷矿点物化探异常特征及成矿潜力分析
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摘要
通过地质、物探、化探以及槽探方法对内蒙古吉源南铌铷矿点的成矿潜力进行评价。结果表明,内蒙古吉源南铌铷矿点赋矿岩石为中生代流纹质火山岩。聚类分析和R型因子分析显示研究区土壤元素可明显分为三个组合:第一组为Rb、Y、Nb、Ta、Sn、U;第二组为Pb、Zn、La;第三组为Cu、W、Mo、Ag、Au。在空间上,土壤Pb、Zn、La、Y、Ta、Sn、Mo、U异常围绕次流纹斑岩呈环形分布,其中Pb、Zn、La异常位于环形外部。土壤环形地球化学异常区具有中高阻高极化的地球物理特征,物化探异常明显受火山机构控制。槽探验证结果表明,矿化岩石的Nb2O5、Rb2O含量均在边界品位以上,推测深部可能存在与次火山岩有关的Nb、Rb等稀有稀土元素矿体。
The metallogenic potential of niobium and rubidium mineral occurrence of south Jiyuan,Inner Mongolia is evaluated by geological,geophysical,geochemical and trench exploration methods. The results show that the host rocks of the occurrence are mainly Mesozoic rhyolitic volcanic rocks. Cluster analysis and R factor analysis show that the soil elements in the study area can be divided into three groups obviously: Rb,Y,Nb,Ta,Sn,U; Pb,Zn,La and Cu,W,Mo,Ag,Au. Spatially,the anomalies of Pb,Zn,La,Y,Ta,Sn,Mo and U in the soil present annulus around the sub-rhyolite porphyry,of which the anomalies of Pb,Zn and La are located in the outer annulus. Soil annulus geochemical anomaly area has the geophysical characteristics of medium-high resistivity and high polarization,which are obviously controlled by volcanic edifice. Trench tests show that the Nb_2 O_5 and Rb_2 O contents of mineralized rocks are all above the cut-off grade. It is speculated that there may be orebodies of rare and rare earth elements such as Nb and Rb related to subvolcanic rocks in the deep part.
The metallogenic potential of niobium and rubidium mineral occurrence of south Jiyuan,Inner Mongolia is evaluated by geological,geophysical,geochemical and trench exploration methods. The results show that the host rocks of the occurrence are mainly Mesozoic rhyolitic volcanic rocks. Cluster analysis and R factor analysis show that the soil elements in the study area can be divided into three groups obviously: Rb,Y,Nb,Ta,Sn,U; Pb,Zn,La and Cu,W,Mo,Ag,Au. Spatially,the anomalies of Pb,Zn,La,Y,Ta,Sn,Mo and U in the soil present annulus around the sub-rhyolite porphyry,of which the anomalies of Pb,Zn and La are located in the outer annulus. Soil annulus geochemical anomaly area has the geophysical characteristics of medium-high resistivity and high polarization,which are obviously controlled by volcanic edifice. Trench tests show that the Nb_2 O_5 and Rb_2 O contents of mineralized rocks are all above the cut-off grade. It is speculated that there may be orebodies of rare and rare earth elements such as Nb and Rb related to subvolcanic rocks in the deep part.
引文
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[12]付建茁.内蒙古八岔沟西铅锌矿矿床成因及找矿标志[J].世界有色金属,2016(16):170,172.FU Jian-zhuo. Eight bifurcation ditch west Inner Mongolia lead-zinc deposit genesis and prospecting marks[J]. World Nonferrous Metals,2016(16):170,172.
[13]王汾连,赵太平,陈伟.铌钽矿研究进展和攀西地区铌钽矿成因初探[J].矿床地质,2012,31(2):293-308.WANG Fen-lian, ZHAO Tai-Ping, CHEN Wei. Advances in study of Nb-Ta ore deposits in Panxi area and tentative discussion on genesis of these ore deposits[J]. Mineral Deposits,2012,31(2):293-308.
[14] Sun G S,Wang Q H,Sun J D,et al. High Nb-Ta rhyolites of the Kyihe region,north Daxingan Mountains,China:geochemistry,petrogenesis,and zircon U-Pb geochronology[J]. Arabian Journal of Geosciences,2018,11(19):572.
[2]何维基.江西省钽铌矿床类型及时空分布规律[J].矿山与地质,2001,15(增刊1):450-456.HE Wei-ji. Tantalum-Niobium ore deposit type in Jiangxi province and its time-space distribution rule[J]. Mineral Resources and Geology, 2001, 15(Suppl. 1):450-456.
[3]冯守忠.内蒙古巴尔哲碱性花岗岩稀有稀土矿床地质特征及成因探讨[J].火山地质与矿产,2000,21(2):137-142.FENG Shou-zhong. Geological characteristic and ore genesis of rare metal and rare-earth ore deposit in Baerzhe alkali granite,Inner Mongolia[J]. Volcanology&Mineral Resources,2000,21(2):137-142.
[4]杨晓勇,赖小东,任伊苏,等.白云鄂博铁-稀土-铌矿床地质特征及其研究中存在的科学问题:兼论白云鄂博超大型矿床的成因[J].地质学报,2015,89(12):2323-2350.YANG Xiao-yong,LAI Xiao-dong,REN Yi-su,et al.Geological characteristics and their scientific problems of the Bayan Obo Fe-REE-Nb deposit:discussion on the origin of Bayan Obo super-large deposit[J]. Acta Geologica Sinica,2015,89(12):2323-2350.
[5]陈宝泉.福建南平西坑铌钽矿区玉帝庵矿段含矿伟晶岩特征[J].福建地质,2008,27(3):281-288.CHEN Bao-quan. Characteristics of the ore-bearing pegnatite in the Yudi'an ore segment of Xikeng columbotantalite,Nanping city, Fujian province[J]. Geology of Fujian,2008,27(3):281-288.
[6]林德松.与陆相火山作用有关的稀有金属矿化[J].矿山与地质,1992(4):264-269.LIN De-song. Rare metal mineralization related to the continental volcanism[J]. Mineral Resources and Geology,1992(4):264-269.
[7]隋振民,陈跃军.大兴安岭东部花岗岩类锆石饱和温度及其地质意义[J].世界地质,2011,30(2):162-172.SUI Zhen-min,CHEN Yue-jun. Zircon saturation temperatures of granites in eastern Great Xing'an Range and its geological signification[J]. Global Geology,2011,30(2):162-172.
[8]王天豪,张书义,孙德有,等.满洲里南部中生代花岗岩的锆石U-Pb年龄及Hf同位素特征[J].世界地质,2014,33(1):26-38.WANG Tian-hao,ZHANG Shu-yi,SUN De-you,et al.Zircon U-Pb ages and Hf isotopic characteristics of Mesozoic granitoids from southern Manzhouli,Inner Mongolia[J]. Global Geology,2014,33(1):26-38.
[9]杨爱雪,孙德有,苟军,等.大兴安岭北部上护林盆地恩和大岭火山机构特征与时代[J].世界地质,2016,35(3):687-696.YANG Ai-xue,SUN De-you,GOU Jun,et al. Characteristics and time of Enhedaling volcanic edifice from Shanghulin Basin in northern Great Xing'an Range[J].Global Geology,2016,35(3):687-696.
[10]鄢明才,顾铁新,迟清华,等.中国土壤化学元素丰度与表生地球化学特征[J].物探与化探,1997,21(3):161-167.YAN Ming-cai, GU Tie-xin, CHI Qing-hua, et al.Abundance of chemical elements of soils in China and supergenesis geochemistry characteristics[J]. Geophysical and Geochemical Exploration,1997,21(3):161-167.
[11]涂金飞,盛夏,汤玄.大兴安岭北段上坑锅铅锌矿床地质特征及成因初探[J].世界有色金属,2015(9):89-92.TU Jin-fei, SHENG Xia, TANG Xuan. The Greater Hinggan Mountains north pit pot Pb-Zn deposit geological characteristics and genesis[J]. World Nonferrous Metals,2015(9):89-92.
[12]付建茁.内蒙古八岔沟西铅锌矿矿床成因及找矿标志[J].世界有色金属,2016(16):170,172.FU Jian-zhuo. Eight bifurcation ditch west Inner Mongolia lead-zinc deposit genesis and prospecting marks[J]. World Nonferrous Metals,2016(16):170,172.
[13]王汾连,赵太平,陈伟.铌钽矿研究进展和攀西地区铌钽矿成因初探[J].矿床地质,2012,31(2):293-308.WANG Fen-lian, ZHAO Tai-Ping, CHEN Wei. Advances in study of Nb-Ta ore deposits in Panxi area and tentative discussion on genesis of these ore deposits[J]. Mineral Deposits,2012,31(2):293-308.
[14] Sun G S,Wang Q H,Sun J D,et al. High Nb-Ta rhyolites of the Kyihe region,north Daxingan Mountains,China:geochemistry,petrogenesis,and zircon U-Pb geochronology[J]. Arabian Journal of Geosciences,2018,11(19):572.