电法在山西五台东腰庄金矿找矿中的应用研究
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摘要
东腰庄金矿床是我国典型的绿岩带型金矿床之一,赋存在五台山绿岩带之中的上太古界五台群鸿门岩组地层之中,具有明显的层控性,并受台怀—李家庄同斜倒转复式向斜与李家庄—大草坪韧性剪切带和变辉绿岩脉控制。矿体呈层状-似层状产出,容矿岩石为强烈黄铁矿化、硅化和碳酸盐化的绢云钠长片岩、绿泥片岩和变辉绿岩脉。
绿岩带型金矿床是国内外重要的金矿床类型,电法勘探是寻找绿岩型金矿床的一种行之有效的找矿方法。东腰庄金矿床的金矿化与黄铁矿富集带相对应,浸染状和细脉浸染状黄铁矿为主要载金矿物,含金黄铁矿化带与赋矿围岩之间存在着明显的电性差异,在东腰庄金矿床已知金矿体外围勘查中采用激发极化法找矿,对有效圈定找矿靶区,发现金矿体,发挥重要作用。
在对国内外典型绿岩带金矿床地质特征和地质—地球物理找矿模型对比分析基础上,总结与分析了东腰庄金矿床的赋矿地层、构造、变辉绿岩、矿体、地球物理等特征,进而建立了东腰庄金矿床地质—地球物理找矿模型。
在东腰庄金矿床地质—地球物理找矿模型指导下,在东腰庄金矿外围2km2找矿区内开展比例尺为1：10000,网度20m×100m的激电中梯扫面测量工作。圈出4个高极化异常,其中,Ⅰ号和Ⅱ号异常标志与特征十分突出与明显,异常形态规整、异常分布范围较为广泛稳定、异常强度较高、异常中心突出明显,具有致矿异常特点,并与地表含金黄铁矿化带相对应,反映金矿化体或矿体异常特征,指示存在一定规模的金矿化体或矿体。通过Ⅰ号异常区激电对称四极测深和数据二维反演处理,发现Ⅰ号异常深部存在3个呈串珠状展布的高极化异常体并与地表黄铁矿(化)带倾向延伸相吻合。预测6个浅部金矿(化)体,长50～100m,宽20～50m,埋深25m～100m；预测3个深部金矿(化)体,长12～70m,矿体宽10～30m,埋深100m以下。其规模具有中小型金矿找矿潜力,提出了钻探验证建议。
Dongyaozhuang gold deposit is one of typical greenstone belt gold deposit in China. It occurs in Wutaishan greenstone belt middle and lower parts of Hongmenyan formation of Wutai group, Archean. Therefore it is also a typical of shear zone-type gold deposit. Gold mineralizations are strictly controlled by Taihuai-Lijiazhuang homoclinal reversing compound syncline and Lijiazhuang-Dacaoping ductile shear zone and metadiabase dyke. The orebodies themselves are mostly stratiform-stratoid in shape. The host rocks are Sericite albite schists, chlorite schists and metadiabase dyke and have experienced intensive Pyritization, silicification and carbonatization.
Greenstone belt gold deposit is a impotent type of gold deposit at home and abroad. Electrical prospecting is an effective way of greenstone belt gold deposit exploration. Gold mineralization is relative to pyritization in Dongyaozhuang gold deposit. Main gold-containing mineral are disseminated and veinlet-disseminated pyrite. According to the notable electric difference between auriferous pyritization belt and wall rock, the induced polarization method is accepted. The induced polarization method is played an important role in circling exploration target and finding ore-body.
At the base of comparative analysis of typical greenstone belt gold deposit's geologic features and geochemical ore-prospecting models at home and abroad, we summarized the features of ore-bearing layer, structure, metadiabase, ore-body, geophysical and ore-finding indexes and established Geological-geophysical ore-prospecting model of Dongyaozhuang gold deposit.
According to Dongyaozhuang gold deposit's Geological-geophysical ore-prospecting model, carried out the induced polarization intermediate gradient scan in the range of 2km2 across mining area of Dongyaozhuang gold deposit, and scale is 1:10000, network is 20m×100m. For 4 anomalies were circled.Ⅰanomaly andⅡanomaly were marked by features of ore-generating anomaly and the anomalous features are obvious, outlines are regular, distribution ranges are large, and centers are clear. The anomalies are relative to surface auriferous pyritization belt and reflecte features of gold ore-formation or ore body. According to induced polarization symmetric four pole sounding and data 2D inversion, we found 3 high polarizability anomalous bodies and distributing as moniliform. We predicated 6 surface mineralization bodies and 3 deep mineralization bodies. The surface mineralization bodies are 50 to 100m long,20 to 50m wide and 25 to 100m deep. The deep mineralization bodies are 12 to 70m lone and 10 to 30m wide, and have a depth in excess of 100m. Forecasting reserve may reach a medium-sized deposit scale. The proposals were brought forward to test drill-holes.
绿岩带型金矿床是国内外重要的金矿床类型,电法勘探是寻找绿岩型金矿床的一种行之有效的找矿方法。东腰庄金矿床的金矿化与黄铁矿富集带相对应,浸染状和细脉浸染状黄铁矿为主要载金矿物,含金黄铁矿化带与赋矿围岩之间存在着明显的电性差异,在东腰庄金矿床已知金矿体外围勘查中采用激发极化法找矿,对有效圈定找矿靶区,发现金矿体,发挥重要作用。
在对国内外典型绿岩带金矿床地质特征和地质—地球物理找矿模型对比分析基础上,总结与分析了东腰庄金矿床的赋矿地层、构造、变辉绿岩、矿体、地球物理等特征,进而建立了东腰庄金矿床地质—地球物理找矿模型。
在东腰庄金矿床地质—地球物理找矿模型指导下,在东腰庄金矿外围2km2找矿区内开展比例尺为1：10000,网度20m×100m的激电中梯扫面测量工作。圈出4个高极化异常,其中,Ⅰ号和Ⅱ号异常标志与特征十分突出与明显,异常形态规整、异常分布范围较为广泛稳定、异常强度较高、异常中心突出明显,具有致矿异常特点,并与地表含金黄铁矿化带相对应,反映金矿化体或矿体异常特征,指示存在一定规模的金矿化体或矿体。通过Ⅰ号异常区激电对称四极测深和数据二维反演处理,发现Ⅰ号异常深部存在3个呈串珠状展布的高极化异常体并与地表黄铁矿(化)带倾向延伸相吻合。预测6个浅部金矿(化)体,长50～100m,宽20～50m,埋深25m～100m；预测3个深部金矿(化)体,长12～70m,矿体宽10～30m,埋深100m以下。其规模具有中小型金矿找矿潜力,提出了钻探验证建议。
Dongyaozhuang gold deposit is one of typical greenstone belt gold deposit in China. It occurs in Wutaishan greenstone belt middle and lower parts of Hongmenyan formation of Wutai group, Archean. Therefore it is also a typical of shear zone-type gold deposit. Gold mineralizations are strictly controlled by Taihuai-Lijiazhuang homoclinal reversing compound syncline and Lijiazhuang-Dacaoping ductile shear zone and metadiabase dyke. The orebodies themselves are mostly stratiform-stratoid in shape. The host rocks are Sericite albite schists, chlorite schists and metadiabase dyke and have experienced intensive Pyritization, silicification and carbonatization.
Greenstone belt gold deposit is a impotent type of gold deposit at home and abroad. Electrical prospecting is an effective way of greenstone belt gold deposit exploration. Gold mineralization is relative to pyritization in Dongyaozhuang gold deposit. Main gold-containing mineral are disseminated and veinlet-disseminated pyrite. According to the notable electric difference between auriferous pyritization belt and wall rock, the induced polarization method is accepted. The induced polarization method is played an important role in circling exploration target and finding ore-body.
At the base of comparative analysis of typical greenstone belt gold deposit's geologic features and geochemical ore-prospecting models at home and abroad, we summarized the features of ore-bearing layer, structure, metadiabase, ore-body, geophysical and ore-finding indexes and established Geological-geophysical ore-prospecting model of Dongyaozhuang gold deposit.
According to Dongyaozhuang gold deposit's Geological-geophysical ore-prospecting model, carried out the induced polarization intermediate gradient scan in the range of 2km2 across mining area of Dongyaozhuang gold deposit, and scale is 1:10000, network is 20m×100m. For 4 anomalies were circled.Ⅰanomaly andⅡanomaly were marked by features of ore-generating anomaly and the anomalous features are obvious, outlines are regular, distribution ranges are large, and centers are clear. The anomalies are relative to surface auriferous pyritization belt and reflecte features of gold ore-formation or ore body. According to induced polarization symmetric four pole sounding and data 2D inversion, we found 3 high polarizability anomalous bodies and distributing as moniliform. We predicated 6 surface mineralization bodies and 3 deep mineralization bodies. The surface mineralization bodies are 50 to 100m long,20 to 50m wide and 25 to 100m deep. The deep mineralization bodies are 12 to 70m lone and 10 to 30m wide, and have a depth in excess of 100m. Forecasting reserve may reach a medium-sized deposit scale. The proposals were brought forward to test drill-holes.
引文
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[6]李金铭,罗延钟主编,电法勘探新进展[M1,地质出版社,1996.
[7]傅良魁.电法勘探教程[M].北京：地质出版社,1983.
[8]丁绪荣,于汇津,邓一谦.金属物探简明教程[M].北京：地质出版社.
[9]张赛殄等.中国电法勘探发展概况[J],地球物理学报.1996,37(1)：408-424.
[10]何继善.双频激电法[Ml,北京：高等教育出版社,2005.
[11]李金铭.激发极化法技术指南[M].北京：中国地质大学,2002.
[12]Groves, D.I. et, al.. Craton-scale distribution in Archaean greenstone gold dposits; Problitive capacity of the metamorphic model.Economic Geology,1987,82:2045-2058.
[13]骆辉,彭晓亮,赵运起.五台山绿岩带铁建造金矿[M].北京：地质出版社,1994.
[14]白瑾.五台山早前寒武纪地质[M].天津：天津科学技术出版社,1986.
[15]沈保丰,孙继源,田永清.五台山一恒山绿岩带金矿床地质[M].北京：地质出版社,1998：63-103.
[16]沈保丰,毛德宝,李俊建.中国绿岩带金矿床的时空分布[J].华北地质矿产杂质,1996,11(3)：385-392.
[17]沈保丰,李俊建,毛德宝.华北地台绿岩带地质特征类型和演化[J].前寒武纪研究进展,1997,20(1)：2-11.
[18]陈俊明.五台山-恒山花岗岩-绿岩地体中金分布的基本格局[J].山西地质,1993,8(2)：178-186.
[19]刘志宏,王安建,许虹.五台山地区韧性剪切带型金矿成因.矿床地质[J],1997,16(4)：350-364.
[20]沈保丰.华北陆台太古宙绿岩带地质及成矿[M].北京：地质出版社,1994.
[21]骆辉,陈志宏,沈保丰.五台山太古宙铁建造型金矿的成矿年龄[J].前寒武纪研究,1999.22(2)：11-16.
[22]陈毓川,李兆鼐,毋瑞身,等中国金矿床及其成矿规律[M].北京：地质出版社,2001.
[23]田永清.恒山一五台山早前寒武纪绿岩带地质及成矿作用[M].山西：山西科技出版社,1992：1-12.
[24]陈平,苗培森山西五台山与早元古代变质砾岩有关的金矿找矿新发现[J].中国地质,1996,3：32-33.
[25]王建.五台山区滹沱盆地演化及金的成矿作用[D].长春：长春科技大学,1999：76-102.
[26]林枫,曹国雄五台山康家沟金矿成矿地质特征[J].华北地质矿产杂志,1996,11(3)：400-406.
[27]陈平,苗培森,田永清,等.山西省五台山太古宙绿岩带金矿成矿系统初论[J].前寒武纪进展,1999,22(3)：14-20.
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