坦桑尼亚环维多利亚湖区岩(矿)石磁化率特征及应用
|
摘要
坦桑尼亚环维多利亚湖太古宙花岗-绿岩带是世界级的金矿带[1],太古界尼安萨(Nyanzian)群绿岩带为主要的赋矿层。金矿床多以富铁硫化物矿体产于条带状含铁建造(BIF)、以及剪切带控制的构造蚀变带中。区内条带状含铁建造、构造蚀变带的磁性参数系统测定与研究,对在该地区寻找绿岩带型金矿具有间接或直接的重要作用[2]。本文以坦桑尼亚环维多利亚湖区金矿地质勘查为例,分别从岩石单元、构造单元和侵入岩三个方面入手,对岩(矿)石磁化率统计特征和空间分布特征进行了分析研究。根据磁化率特征在绿岩带上圈定与金矿有关的条带状含铁建造、构造,取得理想的效果。
The Archaean granite-greenstone belt around Lake Victoria area in Tanzania is a world-class gold deposit belt[1], the Archaeozoic Nyanzian Group greenstone belt is the main ore bearing strata. Gold deposit which mostly in the form of Iron rich sulfide ore occurred in a banded iron formation(BIF) and structural altered zone controlled by shear zone. The determination and study of BIF and structural altered zone magnetic susceptibility system are very important for greenstone type gold deposits prospecting [2]. On the basis of gold deposits prospecting around Lake Victoria area, from three aspects of layer(rocks) units, construction units and intrusive rocks, this paper has analyzed the statistical characteristics and spatial distribution characteristics of rock(ore) magnetic susceptibility. Using magnetic susceptibility characteristics to delimitate BIF and structure alteration zone in greenstone belt is an effective method for gold deposit prospecting in this area.
The Archaean granite-greenstone belt around Lake Victoria area in Tanzania is a world-class gold deposit belt[1], the Archaeozoic Nyanzian Group greenstone belt is the main ore bearing strata. Gold deposit which mostly in the form of Iron rich sulfide ore occurred in a banded iron formation(BIF) and structural altered zone controlled by shear zone. The determination and study of BIF and structural altered zone magnetic susceptibility system are very important for greenstone type gold deposits prospecting [2]. On the basis of gold deposits prospecting around Lake Victoria area, from three aspects of layer(rocks) units, construction units and intrusive rocks, this paper has analyzed the statistical characteristics and spatial distribution characteristics of rock(ore) magnetic susceptibility. Using magnetic susceptibility characteristics to delimitate BIF and structure alteration zone in greenstone belt is an effective method for gold deposit prospecting in this area.
引文
[1]杨东潮,白德胜,曹琼.坦桑尼亚太古宙绿岩带中的BIF型金矿床的勘查标志--以Maheiga金矿为例[J].黄金科学技术,2013,21(4):1-8.
[2]李水平,杨东朝,程华,等.坦桑尼亚条带状含铁建造磁化率参数统计特征及其应用[J].地质与勘探,2013,49(4):784-790.
[3]董树文,李廷栋,陈宣华,等.我国深部探测技术与实验研究进展[J].地球物理学报,2012,55(12):3884-3901.
[4]管志宁.地磁场与磁力勘探[M].北京:地质出版社,2005,81-83.
[5]何金祥,吴智慧.非州矿产资源勘探和开发--坦桑尼亚[J].中国地质,1997,(5):42-44.
[6]J.M.Kabete,D.J.Groves,N.J.Mc Naughton,A.H.Mruma.A new tectonic and temporal framework for the Tanzanian Shield:Implications for gold metallogeny and undiscovered endowment[J].Ore geology reviews,2012,(48):88-124(in English)
[7]郭友钊.矿物岩石物理性质在找矿勘探中的应用[J].国外地质勘探技术,1991,(Z1):36-43.
[8]吴成平,王卫平,肖刚毅,等.内蒙古中部地区岩矿石磁化率特征[J].物探与化探,2014,38(3):490-496.
[9]李水平,王建光,白德胜,等.坦桑尼亚Maheiga金矿地球物理特征与找矿标志[J].地球物理学进展,2014,29(5):2395-2400.
[10]孙忠实,车迎房,郑培玺,等.矿物磁性特征在金矿床形成及成矿预测中的作用[J].地质科学,2005,40(1):32-39.
[11]李水平,王建光,程华,等.钻孔岩芯岩(矿)石磁化率参数特征并用于地层岩性划分[J].物探与化探,2013,37(5):775-778.
[12]崔小军,王建光,彭俊,等.坦桑尼亚维多利亚湖东部绿岩带金矿床地质特征及成因浅析[J].地质与勘探,2014,50(4):789-794.
[13]申随水,李治时,杨守渠.小秦岭地区大比例尺磁测方法找金效果[J].物探与化探,2014,38(4):635-640.
[14]郭鸿军,林晓辉,刘焕然,等.坦桑尼亚西部基戈马-姆藩达地区前寒武纪地质特征及锆石测年新资料[J].地质找矿论丛,2009,24(3):260-266.
[15]程华,李水平,袁杨森,等.坦桑尼亚条带状铁建造和辉绿岩磁异常特征的识别与找矿研究[J].地球物理学进展,2015,30(6):2623-2632.
[2]李水平,杨东朝,程华,等.坦桑尼亚条带状含铁建造磁化率参数统计特征及其应用[J].地质与勘探,2013,49(4):784-790.
[3]董树文,李廷栋,陈宣华,等.我国深部探测技术与实验研究进展[J].地球物理学报,2012,55(12):3884-3901.
[4]管志宁.地磁场与磁力勘探[M].北京:地质出版社,2005,81-83.
[5]何金祥,吴智慧.非州矿产资源勘探和开发--坦桑尼亚[J].中国地质,1997,(5):42-44.
[6]J.M.Kabete,D.J.Groves,N.J.Mc Naughton,A.H.Mruma.A new tectonic and temporal framework for the Tanzanian Shield:Implications for gold metallogeny and undiscovered endowment[J].Ore geology reviews,2012,(48):88-124(in English)
[7]郭友钊.矿物岩石物理性质在找矿勘探中的应用[J].国外地质勘探技术,1991,(Z1):36-43.
[8]吴成平,王卫平,肖刚毅,等.内蒙古中部地区岩矿石磁化率特征[J].物探与化探,2014,38(3):490-496.
[9]李水平,王建光,白德胜,等.坦桑尼亚Maheiga金矿地球物理特征与找矿标志[J].地球物理学进展,2014,29(5):2395-2400.
[10]孙忠实,车迎房,郑培玺,等.矿物磁性特征在金矿床形成及成矿预测中的作用[J].地质科学,2005,40(1):32-39.
[11]李水平,王建光,程华,等.钻孔岩芯岩(矿)石磁化率参数特征并用于地层岩性划分[J].物探与化探,2013,37(5):775-778.
[12]崔小军,王建光,彭俊,等.坦桑尼亚维多利亚湖东部绿岩带金矿床地质特征及成因浅析[J].地质与勘探,2014,50(4):789-794.
[13]申随水,李治时,杨守渠.小秦岭地区大比例尺磁测方法找金效果[J].物探与化探,2014,38(4):635-640.
[14]郭鸿军,林晓辉,刘焕然,等.坦桑尼亚西部基戈马-姆藩达地区前寒武纪地质特征及锆石测年新资料[J].地质找矿论丛,2009,24(3):260-266.
[15]程华,李水平,袁杨森,等.坦桑尼亚条带状铁建造和辉绿岩磁异常特征的识别与找矿研究[J].地球物理学进展,2015,30(6):2623-2632.