Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/327664
Type: Artigo
Title: Multifractal Interpolation And Spectrum-area Fractal Modeling Of Stream Sediment Geochemical Data: Implications For Mapping Exploration Targets
Author: Parsa
Mohammad; Maghsoudi
Abbas; Yousefi
Mahyar; Carranza
Emmanuel John M.
Abstract: The spectrum-area (S-A) fractal model is a powerful tool for decomposition of complex anomaly patterns of gridded geochemical data. Ordinary moving average interpolation techniques are commonly being used for gridding geochemical data; however, these methods suffer from two major drawbacks of (1) ignoring the locally high values and (2) smoothing the interpolated surface. Multifractal moving average interpolation methods have been developed to overcome the shortcomings of ordinary moving average methods. This study seeks to compare two sets of multifractal and ordinary gridded geochemical data using success rate curves and applies the S-A fractal model to decompose anomalous geochemical patterns. A set of stream sediment geochemical data in Ahar area, NW Iran, was used as a case study. Then, a mineralization-related multi-element geochemical signature was gridded by ordinary and multifractal approaches and considered for further analyses. The S-A fractal method was applied to decompose anomaly and background components of the resultant multi-element geochemical signature. Exploration targets were delimited and further evaluated using two bivariate statistical procedures of Student's t-value and normalized density index. The results revealed that (a) application of multifractal gridded data enhances the predicting ability of geochemical signatures, (b) application of S-A fractal model on multifractal gridded data allows for superior discrimination of geochemical anomalies, and (c) the multi-element geochemical anomalies in the Ahar area related to porphyry-Cu deposits were properly delineated through sequence application of multifractal interpolation and S-A fractal model. (C) 2016 Elsevier Ltd. All rights reserved.
Subject: Spectrum-area (s-a) Fractal Model
Multifractal Moving Average Interpolation
Student's T-value
Normalized Density Index
Editor: Pergamon-Elsevier Science LTD
Oxford
Rights: fechado
Identifier DOI: 10.1016/j.jafrearsci.2016.11.021
Address: http://www.sciencedirect.com/science/article/pii/S1464343X16303806
Date Issue: 2017
Appears in Collections:Unicamp - Artigos e Outros Documentos

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