庞西垌地区Ag-Au矿化信息识别与提取
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摘要
庞西垌地区位于钦杭成矿带南缘,该区复杂的地质演化历史导致了成矿地质背景的复杂性、成矿作用的多期性和多样性。分别应用地质统计学和因子多重分形(ρ-A)、因子多重滤波(S-A)对1∶50 000化探数据中Ag、Au含量数据进行了分析,获取了不同层次的矿致异常信息。结果表明:①泛克立格法获取的区域Ag、Au异常表明该区银金含量变化主要受庞西垌断裂、古城-沙铲断裂控制,这与多重滤波分形方法中的低通滤波获取的异常具有相似特征;②Ag含量的变化比Au有更好的连续性,Ag含量的变化表现出较强的结构性特征,而金含量的变化则表现出更强的区域特征;③因子多重分形(ρ-A)等值线图与该区的岩体分布有着良好的对应关系;④S-A模型能够提取不同层次的致矿异常信息,包括区域异常和局部异常,局部异常往往与矿化关系密切。通过F3主因子局部异常与泛克立格法识别的Ag、Au异常信息的融合,能增强与Ag、Au矿有关的地球化学异常信息,为研究区寻找该类矿床提供了科学根据。
Pangxidong area is located in the south margin of Qinhang metallogenic belt.The complex geological evolution history leads to complex geological settings,multistage and various character of mineralization.1∶50 000survey data of Ag-Au from stream sediment are analyzed by geostatistics,factor multifractal(ρ-A),multiple filter factor(S-A)methods,in order to obtain anomaly information caused by ore mineralization.The research results are as follows:(1)Regional anomaly of Ag,Au distribution by Universal Kriging method is controlled by Pangxidong Fault and Gucheng-Shachang Fault,which has similar characters with the anomaly obtained by low pass filting wave with the application of multiple filter fractal method.(2)Variation of Ag concentration exhibits more continuous than Au in region,however,variation of Au content present stronger regional characters.(3)Contour map obtained by factor multifractal method corresponds well with the regional distribution of rock bodies.(4)S-A model can substract anomaly information caused by ore mineralization,including regional and local anomalies,and the latter usually has closer relationship with mineralization.Overlapping of local anomalies confirmed by the F3 main factor and Ag,Au anomaly identified by Universal Kriging method can enhance the geochemical anomaly related to Ag,Au mineralization and provide scientific basis for looking for this kind of mineral deposit.
Pangxidong area is located in the south margin of Qinhang metallogenic belt.The complex geological evolution history leads to complex geological settings,multistage and various character of mineralization.1∶50 000survey data of Ag-Au from stream sediment are analyzed by geostatistics,factor multifractal(ρ-A),multiple filter factor(S-A)methods,in order to obtain anomaly information caused by ore mineralization.The research results are as follows:(1)Regional anomaly of Ag,Au distribution by Universal Kriging method is controlled by Pangxidong Fault and Gucheng-Shachang Fault,which has similar characters with the anomaly obtained by low pass filting wave with the application of multiple filter fractal method.(2)Variation of Ag concentration exhibits more continuous than Au in region,however,variation of Au content present stronger regional characters.(3)Contour map obtained by factor multifractal method corresponds well with the regional distribution of rock bodies.(4)S-A model can substract anomaly information caused by ore mineralization,including regional and local anomalies,and the latter usually has closer relationship with mineralization.Overlapping of local anomalies confirmed by the F3 main factor and Ag,Au anomaly identified by Universal Kriging method can enhance the geochemical anomaly related to Ag,Au mineralization and provide scientific basis for looking for this kind of mineral deposit.
引文
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[2]池顺都,赵鹏大.应用GIS圈定找矿可行地段和有利地段:以云南元江地区大红山群铜矿预测为例[J].地球科学:中国地质大学学报,1998,23(2):125-128.
[3]王瑞廷,毛景文,任小华,等.区域地球化学异常评价的现状及其存在的问题[J].中国地质,2005,32(1):168-174.
[4]黄静宁,赵鹏大.东天山地区Cu-Au异常信息提取与评价[J].地球科学:中国地质大学学报,2011,36(2):317-326.
[5]王学仁.地质数据的多变量统计分析[M].北京:科学出版社,1982:249.
[6]赵少卿,魏俊浩,高翔,等.因子分析在地球化学分区中的应用:以内蒙古石板井地区1∶5万岩屑地球化学测量数据为例[J].地质科技情报,2012,31(2):27-34.
[7]成秋明.成矿过程奇异性与矿床多重分形分布[J].矿物岩石地球化学通报,2008,27(3):298-305.
[8]Afzal P,Khakzad A,Moarefvand P,et al.Geochemical anomaly separation by multifractal modeling in Kahang(Gorgor)porphyry system,Central Iran[J].Journal of Geochemical Exploration,2010,104:34-46.
[9]Sadeghi B,Moarefvand P,Afzal P.Application of fractal models to outline mineralized zones in the Zaghia iron ore deposit,Central Iran[J].Journal of Geochemical Exploration,2012,122:9-19.
[10]孙华山,曹新志,袁立川,等.庞西垌银矿区控矿断裂地质特征及其形成演化[J].金属矿山,2007(4):39-43.
[11]阮振辉.庞西垌金银矿地质特征[J].桂林冶金地质学院学报,1984,4(4):113-118.
[12]周洪伟.正态性检验的几种常用方法[J].南京晓庄学院学报,2012(10):13-18.
[13]王仁铎,胡光道.线性地质统计学[M].北京:地质出版社,1983.
[14]王景雷,孙景生,张寄阳,等.基于GIS和地质统计学的作物需水量等值线图[J].农业工程学报,2004,20(5):51-54.
[15]成秋明.非线性矿床模型与非常规矿产资源评价[J].地球科学:中国地质大学学报,2003,28(4):1-10.
[16]Cheng Q M,Agterberg F P,Ballantyne S B.The separation of geochemical anomailes from background by fractal methods[J].Journal of Geochemical Exploration,1994,51:109-130.
[17]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:中国地质大学学报,2000,25(3):311-318.
[18]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:中国地质大学学报,2004,29(6):733-743.