青海省五龙沟地区化探金异常下限确定方法探讨
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摘要
东昆仑地区是青海省乃至全国重要的金成矿区,化探(地球化学勘查)作为该区域基础性的勘查手段在异常圈定中金的异常下限确定尤为重要。五龙沟地区作为东昆仑重要的金富集区之一,具有很好代表性。分别用传统方法和分形方法对该区域水系沉积物数据进行处理,求取异常下限并进行异常圈定。分析对比发现,分形方法(含量—面积分形法)得出的金异常下限圈定的异常,漏矿的风险不会太大,且大大缩小了异常查证的范围,从而达到快速高效地实现地质找矿重大突破。因此,在五龙沟为代表的东昆仑地区找寻金矿的工作中,采用分形方法确定金异常下限是可行的。
The eastern Kunlun area,an important gold mining area of Qinghai province and even the whole country,has enormous potential to find gold.For the geochemical exploration is a fundamental exploration method in this region,the determination of reasonable lower threshold is particularly important in anomaly delineating.Wulonggou region as one of the most important gold mining area in The eastern Kunlun area has very good representative.We respectively apply the traditional method and fractal method to deal with the regional stream sediment data,determine the anomaly threshold for gold anomalies delineated.Contrast analysis found that using fractal method(especially the content-surface fractal method)to determine the threshold of gold and identify abnormal has low risk of missing gold ore.It can greatly reduce prospecting target area,so as to achieve fast and efficient implementation of geological prospecting breakthrough.Therefore,fractal method adopted to define the gold anomaly threshold is feasible for gold searching in the eastern Kunlun area represented by Wulonggou.
The eastern Kunlun area,an important gold mining area of Qinghai province and even the whole country,has enormous potential to find gold.For the geochemical exploration is a fundamental exploration method in this region,the determination of reasonable lower threshold is particularly important in anomaly delineating.Wulonggou region as one of the most important gold mining area in The eastern Kunlun area has very good representative.We respectively apply the traditional method and fractal method to deal with the regional stream sediment data,determine the anomaly threshold for gold anomalies delineated.Contrast analysis found that using fractal method(especially the content-surface fractal method)to determine the threshold of gold and identify abnormal has low risk of missing gold ore.It can greatly reduce prospecting target area,so as to achieve fast and efficient implementation of geological prospecting breakthrough.Therefore,fractal method adopted to define the gold anomaly threshold is feasible for gold searching in the eastern Kunlun area represented by Wulonggou.
引文
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[13]张雪亭,杨生德,杨站君.青海省大地构造图说明书[R],青海省地质图说明书[R].青海省地质矿产勘查开发局,2005.ZHANG X T,YANG S D,YANG Z J.Geotectonic map instruction of Qinghai province[R].Qinghai Provincial Bureau of Geominerals Exploration,2005.(In Chinese)
[14]李厚民,沈远超,胡正国,等.青海东昆仑五龙沟金矿床成矿条件及成矿机理[J].地质与勘探,2001,37(1):65-69.LI H M,SHEN Y C,HU Z G,et al.Minerogenetic mechanism and condition of Wulonggou gold deposit in east Kunlun mountains,Qinghai province[J].Geology And Prospecting,2001,37(1):65-69.(In Chinese)
[2]韩东昱,龚庆杰,向运川.区域化探数据处理的几种分形方法[J].地质通报,2004,27(7):714-719.HAN D Y,GONG Q J,XIANG Y C.Some new fractal methods for regional geochemical survey data processing[J].Geological Bulletin of China,2004,27(7):714-719.(In Chinese)
[3]吕文超,周永章,张焱,等.钦杭成矿带南段文地幅水系沉积物地球化学异常识别[J].中山大学学报(自然科学版),2012,51(5):107-112.LV W C,ZHOU Y Z,ZHANG Y,et al.Geochemical anomaly identification of stream sediments of Wendi sheet in the south segment of the Qinzhou-Hangzhou metallogenic belt[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2012,51(5):107-112.(In Chinese)
[4]孙忠军.矿产勘查中化探异常下限的多重分形计算方法[J].物探化探计算技术,2007,29(1):54-57.SUN Z J.Multifractal method of geochemical threshold in mineral exploration[J].Computing Techniques For Geophysical and Geochemical Exploration,2007,29(1):54-57.(In Chinese)
[5]成秋明.多维分形理论和地球化学元素分布规律[J].地球科学,2000,25(3):311-318.CHENG Q M.Multifractal theory and geochemical element distribution pattern[J].Earth Science,2000,25(3):311-318.(In Chinese)
[6]成秋明.空间模式的广义自相似性分析与矿产资源评价[J].地球科学,2004,29(6):733-743.CHENG Q M.Quantifying the generalized self-similarity of spatial patterns for mineral resource assessment[J].Earth Science,2004,29(6):733-743.(In Chinese)
[7]徐明钻,朱立新,马生明,等.多重分形模型在区域地球化学异常分析中的应用探讨[J].地球学报,2010,31(4):611-618.XU M Z,ZHU L X,MA S M,et al.A tentative discussion on the application of multi-fractal models to the analysis of regional geochemical anomalies[J].Acta Geoscientica Sinica,2010,31(4):611-618.(In Chinese)
[8]张磊,申维.分形方法在澳大利亚新南威尔士地区地球化学异常下限确定中的应用[J].地质通报,2009,28(2):245-249.ZHANG L,SHEN W.Application of fractal method in lower threshold definition of geochemistry anomaly in New South Wales area,Australia[J].Geological Bulletin of China,2009,28(2):245-249.(In Chinese)
[9]娄德波,肖克炎,左仁广,等.分形滤波技术在新疆黄山-镜儿泉镍铜成矿带中的应用[J].地球学报,2012,33(1):83-90.LOU D B,XIAO K Y,ZUO R G,et al.The application of fractal filtering technique to the study of the Huangshan-Jing'erquan Ni-Cu metallogenic belt,Xinjiang[J].Acta Geoscientica Sinica,2012,33(1):83-90.(In Chinese)
[10]张建,王登红,孙宝生,等.基于分形理论的成矿空间分析——以新疆东天山康古尔塔格金矿带为例[J].地球学报,2009,30(1):58-64.ZHANG J,WANG D H,SUN B S,et al.Metallogenic spatial analysis based on fractal theory:a case study of the kangguertage gold ore belt in Xinjiang[J].Acta Geoscientica Sinica,2009,30(1):83-90.(in Chinese)
[11]田承盛.东昆仑中段五龙沟矿集区金矿成矿作用及成矿预测研究[D].北京:中国地质大学,2012.TIAN C S.Research on gold mineralization and metallogenic prognosis in Wulonggou ore concentration areas of east Kunlun middle part[D].Beijing:China University of Geosciences,2012.(In Chinese)
[12]赵俊伟.青海东昆仑造山带造山型金矿床成矿系列研究[D].长春:吉林大学,2008.ZHAO J W.Study on orogenicgold mettallogenic series in eastern Kunlun orogenic belt,Qinghai province[D].Changchun:Jilin University,2008.(In Chinese)
[13]张雪亭,杨生德,杨站君.青海省大地构造图说明书[R],青海省地质图说明书[R].青海省地质矿产勘查开发局,2005.ZHANG X T,YANG S D,YANG Z J.Geotectonic map instruction of Qinghai province[R].Qinghai Provincial Bureau of Geominerals Exploration,2005.(In Chinese)
[14]李厚民,沈远超,胡正国,等.青海东昆仑五龙沟金矿床成矿条件及成矿机理[J].地质与勘探,2001,37(1):65-69.LI H M,SHEN Y C,HU Z G,et al.Minerogenetic mechanism and condition of Wulonggou gold deposit in east Kunlun mountains,Qinghai province[J].Geology And Prospecting,2001,37(1):65-69.(In Chinese)