基于ETM~+数据和GIS技术的缅甸铜金矿成矿预测
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摘要
在利用遥感数据和地理信息系统(GIS)技术的矿产资源勘查与评价中,矿化蚀变信息提取和构造信息提取起着至关重要的作用。以缅甸铜金矿为例,利用ETM+遥感图像,采用比值法、阈值分割和主成分分析(PCA)提取羟基蚀变信息;利用数字高程模型和遥感数据提取与铜金矿化有关的线环构造,结合地质资料和上述信息,利用证据权和分形方法进行整合,确定该研究区的成矿远景区。结果发现,已知铜金矿均分布于成矿靶区中,综合信息可为下一步的矿产资源勘探工作提供决策依据。
The extraction of mineralization-alteration and structure information by using remote sensing data and geographical Information System(GIS) technology plays an important role in mineral resources prospecting and assessment. Choosing a copper and gold mine in Myanmar as an example, the authors adopt band ratio, threshold segmentation and principal component analysis(PCA)to extract the hydroxyl alteration information using ETM+remote sensing images. Digital elevation model(DEM)(30m spatial resolution) and ETM+data are used to extract linear and circular faults that are associated with copper and gold mineralization. Combining geological data with the above information, the authors use weight of evidence and fractal method to integrate and identify the favorable ore-forming zones in this area. The research results show that the known copper and gold deposits are located within high grade potential targets, and the integrated information can be used to the mineral resources decision-making for further exploration.
The extraction of mineralization-alteration and structure information by using remote sensing data and geographical Information System(GIS) technology plays an important role in mineral resources prospecting and assessment. Choosing a copper and gold mine in Myanmar as an example, the authors adopt band ratio, threshold segmentation and principal component analysis(PCA)to extract the hydroxyl alteration information using ETM+remote sensing images. Digital elevation model(DEM)(30m spatial resolution) and ETM+data are used to extract linear and circular faults that are associated with copper and gold mineralization. Combining geological data with the above information, the authors use weight of evidence and fractal method to integrate and identify the favorable ore-forming zones in this area. The research results show that the known copper and gold deposits are located within high grade potential targets, and the integrated information can be used to the mineral resources decision-making for further exploration.
引文
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1Cheng Q.GeoData Analysis System(GeoDAS)for Mineral Exploration:User's Guide and Exercise Manual[M].Material for the training workshop on Geo DAS held at York University,2000.
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[3]施美凤,刘书生.实施“走出去”资源战略打造一流业务发展平台——成都地质调查中心东南亚地区地质矿产研究和勘查成果[J].科技成果管理与研究,2013,(8):76-78.
[4]刘文兰,张微.遥感构造蚀变异常信息提取及找矿预测——以老挝为例[J].国土资源遥感,2012,(2):68-74.
[5]何拥军.缅甸的地质背景和盆地[J].海洋地质动态,1995,(10):20-21.
[6]赖生华,麻建明,廖林.缅甸中央沉降带Chindwin盆油气勘探潜力[J].天然气工业,2005,25(11):21-24.
[7]张玉君,曾朝铭,陈薇.ETM+(TM)蚀变遥感异常提取方法研究与应用——方法选择和技术流程[J].国土资源遥感,2003,(2):44-49.
[8]Agterberg F P,Bonham-Carter G F.Deriving weights of evidence from geosciences contour maps for the prediction of discrete events[C]//Proceedings 22nd APCOM Symposium.Technical University,Berlin,Germany,1990,(2):381-396.
[9]Agterberg F P,Bonham-Carter G F,Wright D F.Statistical pattern integration for mineral exploration[C]//Gaal G,Merriam D F.Computer applications in resource exploration.Pergamon Press,Oxford,1990:1-21.
[10]王萍.证据权法三维建模及其成矿预测应用研究[D].中南大学硕士学位论文,2008.
[11]张建.分形理论在东天山金矿预测中的运用[D].新疆大学硕士学位论文,2006.
[12]Cheng Q M,Agterberg F,Ballantyne S.The separation of geochemical anomalies from background by fractal methods[J].Journal of Geochemical Exploration,1994,51(2):109-130.
[13]Cheng Q M,Li Q.A fractal concentration-area method for assigning a color palette for image representation[J].Computers&Geosciences,2002,28(4):567-575.
1Cheng Q.GeoData Analysis System(GeoDAS)for Mineral Exploration:User's Guide and Exercise Manual[M].Material for the training workshop on Geo DAS held at York University,2000.