Prospecting of gold mineralization in Saqez area (NW Iran) using geochemical, geophysical and geological studies based on multifractal modelling and principal component analysis
Prospecting of gold mineralization in Saqez area (NW Iran) using geochemical, geophysical and geological studies based on multifractal modelling and principal component analysis
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DOI：
10.1007/s12517-014-1625-2
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发表时间：
2015-08
影响因子：
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通讯作者：
A. Almasi;A. Jafarirad;P. Afzal;M. Rahimi
中科院分区：
文献类型：
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作者：
A. Almasi;A. Jafarirad;P. Afzal;M. Rahimi
本研究的目的是根据伊朗西北部Saqez地区的地质、地球化学和地球物理资料寻找金矿远景区。为了实现这一任务的数据，448个水系沉积物样品的分析被用来确定元素的相关性使用二元和多元相关方法，如斯皮尔曼和主成分分析（PCA）。然后，利用浓度-数量多重分形模型，从背景和主成分分析的第一因子中提取出Au、As、Bi、Hg的异常阈值。此外，为了研究断层、裂隙、岩性接触等构造与Au异常的关系，采用增强的多级边缘检测方法从航磁数据中提取磁异常的边缘。随后，将地球化学异常和提取的线性构造与位于异常区汇水盆地的地质细节进行对比，以确定有利的容矿岩石，并研究可能的金矿化类型。
The aim of this study is to find gold prospecting areas based on geological, geochemical and geophysical data in Saqez area, NW of Iran. In order to achieve this task data, the analysis of 448 stream sediment samples are used to determine elemental correlations using bivariate and multivariate correlation methods, such as Spearman and principal component analysis (PCA). Afterwards, concentration–number multifractal model is used to delineate anomaly thresholds from the background for Au, As, Bi, Hg and first factor of the PCA. Moreover, for studying structures such as faults, fractures, and lithological contacts and their relationship with Au anomalies, the edges of magnetic anomalies are detected from aeromagnetic data based on an enhanced multilevel edge detection method. Subsequently, the geochemical anomalies and the extracted lineaments are correlated with geological particulars which are located in the catchment basins of anomalous areas to specify favourable host rocks and to study possible types of gold mineralization.