东川矿区岩石磁化率特征及其应用研究
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摘要
近年来,我国经济迅猛发展,对矿产资源的需求与日俱增,然而随着地质找矿工作程度的不断加深,露头矿和浅部矿产资源在逐年减少,地质找矿工作已转为以寻找盲矿体和深部隐伏矿体为主,找矿的难度和风险加大。为此,需要研究新的找矿评价方法。本文在对东川地质特征和成矿条件认真分析的基础上,通过研究矿区岩矿石磁化率特征进行找矿预测和靶区圈定,以探索找矿评价的新方法。
东川矿区位于“康滇地轴”云南段北端,为裂谷型铜矿,其成矿作用为火山喷流热液沉积-改造叠加。本文通过测定并分析解读因民、滥泥坪两矿区岩石磁化率特征结合地质特征鉴定岩性,进行成矿预测。
1.对因民矿区和滥泥坪矿区根据钻孔岩心及坑道实测地层剖面,同时进行磁化率测试。通过分析研究磁化率参数的变化规律,探求磁化率与成矿的关系。研究认为,当岩石磁化率K>50×10-3SI时,可初步判定作为圈定找矿靶区的标志。此方法具有方便快捷、成本低等优点,不失为一种快速评价方法,可作为本区同类型矿床找矿评价新方法进行推广。
2.通过岩石磁化率测试,在滥泥坪矿区侵入岩体中发现了与碱性岩体有关的铜并伴生Au、Ag的铁氧化物铜金型(IOCG)矿体,该类矿床在东川地区有广阔的找矿前景。
3.在因民矿区：“稀矿山式”含铜磁铁矿层是该地区最重要的赋矿层位。可以通过在该地区做磁化率测试迅速圈定磁铁矿化异常区,直接寻找磁铁矿体。也就是说对于该地区磁化率异常可作为直接寻找磁铁矿体的标志,间接寻找铜矿体标志。
In recent years,with the rapid of economical development of our country, the demand of mineral material also surged to meet our steps. However, with the degree of geological exploration work deepening,the outcrop and shallow mining of mineral resources reduced significantly year by year. This situation force explorers shift their target to Blind ore bodies and deep concealed ore bodies instead of Outcrop and shallow mining of mineral resources, which maybe companied with much more risk and difficulties.To this end, it need to study for new methods of prospecting.In this paper, in the basis of careful analysis for geological characteristics and ore-forming conditions in Dongchuan, through research of magnetic susceptibility of rocks to made prospecting forecast and target delineation and to explore new methods of prospecting.
Dongchuan district in "Kang-Dian axis" Yunnan section of the north, for Rift Valley copper, the ore-forming function is volcanic exhalative hydrothermal deposits transformation superimposed. In the paper,through measuring and analyzing magnetic susceptibility, density and geological characteristics in Yin-Min and Lan-Niping mineral fields to identified lithologic characteristics and interpretated classification of strata, finally completed metallogenic prediction.
1. According to drill core and trench measured stratigraphic sectionmine in Yin-Min and Lan-Niping mineral fields,to test the magnetic susceptibility.Through the analysis of magnetic susceptibility parameter variation to explore the relation of magnetic susceptibility and mineralization. Through the study, when the rock magnetic susceptibility K>50×10-3SI, it can be regarded as a initial target of ore delineation;then combined with the parameter of density parameters to analysis Fe、Cu grade,finally distinguish between rocks or minerals. This method is convenient and low cost, is a quick evaluation method that can be used as a kind of exploration of innovative ways to promote in this area with the same types of deposits.
2. Through test the rock of magnetic susceptibility, in Lan-Niping intrusive rock found copper which contain mass Au associated with alkaline rock and Ag iron oxide copper gold (IOCG) ore. Such deposits has the broad prospects in Dongchuan district prospecting.
3. In Yin-Min district:"Xi-Kuangshan type " is one of the important deposit. By testing rocks of magnetic susceptibility,it can quickly delineste anomaly areas, direct looking for copper magnetite.As say:magnetic anomaly can look for magnetite, Indirect search for copper.
东川矿区位于“康滇地轴”云南段北端,为裂谷型铜矿,其成矿作用为火山喷流热液沉积-改造叠加。本文通过测定并分析解读因民、滥泥坪两矿区岩石磁化率特征结合地质特征鉴定岩性,进行成矿预测。
1.对因民矿区和滥泥坪矿区根据钻孔岩心及坑道实测地层剖面,同时进行磁化率测试。通过分析研究磁化率参数的变化规律,探求磁化率与成矿的关系。研究认为,当岩石磁化率K>50×10-3SI时,可初步判定作为圈定找矿靶区的标志。此方法具有方便快捷、成本低等优点,不失为一种快速评价方法,可作为本区同类型矿床找矿评价新方法进行推广。
2.通过岩石磁化率测试,在滥泥坪矿区侵入岩体中发现了与碱性岩体有关的铜并伴生Au、Ag的铁氧化物铜金型(IOCG)矿体,该类矿床在东川地区有广阔的找矿前景。
3.在因民矿区：“稀矿山式”含铜磁铁矿层是该地区最重要的赋矿层位。可以通过在该地区做磁化率测试迅速圈定磁铁矿化异常区,直接寻找磁铁矿体。也就是说对于该地区磁化率异常可作为直接寻找磁铁矿体的标志,间接寻找铜矿体标志。
In recent years,with the rapid of economical development of our country, the demand of mineral material also surged to meet our steps. However, with the degree of geological exploration work deepening,the outcrop and shallow mining of mineral resources reduced significantly year by year. This situation force explorers shift their target to Blind ore bodies and deep concealed ore bodies instead of Outcrop and shallow mining of mineral resources, which maybe companied with much more risk and difficulties.To this end, it need to study for new methods of prospecting.In this paper, in the basis of careful analysis for geological characteristics and ore-forming conditions in Dongchuan, through research of magnetic susceptibility of rocks to made prospecting forecast and target delineation and to explore new methods of prospecting.
Dongchuan district in "Kang-Dian axis" Yunnan section of the north, for Rift Valley copper, the ore-forming function is volcanic exhalative hydrothermal deposits transformation superimposed. In the paper,through measuring and analyzing magnetic susceptibility, density and geological characteristics in Yin-Min and Lan-Niping mineral fields to identified lithologic characteristics and interpretated classification of strata, finally completed metallogenic prediction.
1. According to drill core and trench measured stratigraphic sectionmine in Yin-Min and Lan-Niping mineral fields,to test the magnetic susceptibility.Through the analysis of magnetic susceptibility parameter variation to explore the relation of magnetic susceptibility and mineralization. Through the study, when the rock magnetic susceptibility K>50×10-3SI, it can be regarded as a initial target of ore delineation;then combined with the parameter of density parameters to analysis Fe、Cu grade,finally distinguish between rocks or minerals. This method is convenient and low cost, is a quick evaluation method that can be used as a kind of exploration of innovative ways to promote in this area with the same types of deposits.
2. Through test the rock of magnetic susceptibility, in Lan-Niping intrusive rock found copper which contain mass Au associated with alkaline rock and Ag iron oxide copper gold (IOCG) ore. Such deposits has the broad prospects in Dongchuan district prospecting.
3. In Yin-Min district:"Xi-Kuangshan type " is one of the important deposit. By testing rocks of magnetic susceptibility,it can quickly delineste anomaly areas, direct looking for copper magnetite.As say:magnetic anomaly can look for magnetite, Indirect search for copper.
引文
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[2]Thompson, R., Oldfield, F. Environmental magnetism. London:Allen & Unwin.1986.1-227
[3]史謌.地球物理学基础[M].北京大学出版社.2002
[4]黄国祥余惠祥蔡文成.应用地球物理-磁法勘探[M].中南工业大学出版.1988
[5]Ising,Ann.Phy.1931
[6]吴学丽.近红外光谱和磁化率在金矿预测中的应用.[硕士学位论文].中国地质大学(北京).地球科学与资源学院.2008
[7]Graham J W. Magnetic susceptibility anisotropy an unexploited petrofabric. Bull. Ceo. Suo. Am. 1954,65:1257-1258
[8]吉云平.不同类型沉积物中磁化率的解释.硕士研究生学位论文.北京大学.环境学院.2007
[9]毛景文,余金杰,袁顺达.铁氧化物-铜-金(IOCG)型矿床：基本特征[J]、研究现状与找矿勘查.矿床地质.2008,27(3)：267-278
[10]Hitzman M W, Oresskes N and Einaudi M T. Geological charac-teristics and tectonic setting of Proterozoic iron oxide(Cu-U-Au-REE) deposits[J]. Precambrian Research.1992,58:241-287.
[11]Hitzman M W. Iron oxide-Cu-Au deposits:What, where, when,and why [A]. In:Porter T M,ed. 2000
[12]Hitzman M W.Hydrothermal iron oxide copper-gold and related deposits:A global perspective[M]. Adelaide:Aus-tralian Mineral Foundation.2000
[13]Niiranen T. Iron oxide-copper-gold deposits in Finland:Case studies from the Perapohja schist belt and the Central Lapland green-stone belt [D]. Ph. D Thesis, University of Helsinki.2005
[14]李泽琴,胡瑞忠,王奖臻,等.中国首例铁氧化物铜金铀-稀土型矿床的厘定及其成矿演化成[J].矿物岩石地球化学通报,2002,21(4)：258-260
[15]李泽琴,王奖臻,刘家军等.拉拉铁氧化物-铜-金-钼-稀土矿床Re-Os同位素年龄及其地质意义[J].地质找矿论丛.2003,18(1)：39-42
[16]方维萱,柳玉龙,郭茂华等.云南东川滥泥坪铁氧化物铜金型(IOCG)矿床发现与找矿方向[J].矿物岩石地球化学通报.2009,28(增刊)：199
[17]方维萱,柳玉龙,张守林等.全球铁氧化物铜金型(IOCG)矿床的三类大陆动力学背景与成矿模式[J].西北大学学报(自然科学版).2009,39(3)：404-413
[18]方维萱,郭玉乾.基于风险分析的商业性找矿预测新方法与应用[J].地学前缘,2009,16(2)：209-226
[19]徐海军,金振民,欧新功.磁化率和密度对中国大陆科学钻探主孔100-2000m岩石类型的判别[J].地球科学—中国地质大学学报.2006,7：31-4
[20]许庆刚,刘麟书,高明远,曹凤云.中国某些地区岩石密度及磁化率资料的初步分析[J].地球物理学报.1960,5(2)：9-2
[21]朱永刚,于长春.湖北省大冶铁矿区内矿石磁性特征分析[J].地质找矿论丛,2006,21(10)：89-93
[22]阎桂林编著.岩石磁化率各向异性在地学中的应用[M].武汉：中国地质大学出版社.1996
[23]龚琳,何毅特,陈天佑,等.云南东川元古宙裂谷型铜矿[M].北京：冶金工业出版社,1996：1-252
[24]Graham J W.Magnetic susceptibility anisotropy,an unexploited petrofabric element[J]. Bull. Geol. Soc.Am.,1951,25 (8):223-240
[25]谢世业,黄有德,何国朝.云南东川中远古宙裂谷型铜矿地质、地球化学及成矿模式的研究[J].矿产与地质.1995,9(3)：174-179
[26]腾志宏,岳乐平,蒲仁海,邓秀琴边小卫.用磁性地层学方法讨论西域组的时代[J].地质评论.1996,42(6)：481-489
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