Analysis and modeling of geospatial datasets for porphyry copper prospectivity mapping in Chahargonbad area, Central Ira
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ORIGINAL PAPER
Analysis and modeling of geospatial datasets for porphyry copper prospectivity mapping in Chahargonbad area, Central Iran Zahra Yazdi & Ali Reza Jafari Rad & Kimiya Sadat Ajayebi
Received: 14 July 2014 / Accepted: 26 November 2014 # Saudi Society for Geosciences 2015
Abstract In mineral exploration, proposing new prospects is a main issue and geospatial information system (GIS) offers different techniques for this procedure. Mineral prospectivity maps (MPMs) can reduce costs and errors for predicting mineral potentials. In this research, data layers have been analyzed and integrated for porphyry copper mineral prospectivity mapping in Chahargonbad sheet of Kerman Province, Central Iran. First of all, geological, geochemical, geophysical, and satellite imagery have been processed separately and assigned according to their favorability in porphyry copper mineralization using index overlay and fuzzy logic methods which was lead to introduce two priorities for further exploration. Eight hundred forty-six geochemical stream sediment samples were analyzed using multifractal concentration-number model to generate geochemical anomaly maps. Afterward, airborne magnetic data was used to extract magnetic edges which can represent structures (faults and fractures) and lithological contacts. Airborne radiometric data is also used to identify felsic units based on K, Th, and U (RGB) ternary image. Thereafter, satellite imagery (ASTER, ETM+ images) was processed based on relative absorption band depth (RBD), principle component analysis (PCA) and Crosta methods in order to separate alteration zones in the study area. Totally, 80 km2 has been detected as the first priority that is located in the northwest (Kuh Panj), center (south of Hamid Abad and east of Sorkhgino), southeast (Chenar Kaf), and southwest (north of Z. Yazdi (*) : A. R. Jafari Rad Department of Geology, Science and Research Branch, Islamic Azad University (IAU), Tehran, Iran e-mail: [email protected] A. R. Jafari Rad e-mail: [email protected] K. S. Ajayebi Department of Geology, Karaj Branch, Islamic Azad University (IAU), Alborz, Iran e-mail: [email protected]
Alimoradi) of this sheet. Also, the second priority (97 km2) is located in the center (southeast of Syloieh), southeast (Chenar Kaf), east (Cheheltan), and northwest (south of Kuh Panj). Keywords Porphyry copper . Chahargonbad . Fuzzy logic . Mineral prospectivity map . Multifractal . Geophysical airborne
Introduction Thirty years ago, when the second volume of the Handbook of Exploration Geochemistry was published (Howarth 1983), computers were just becoming useful tools in the analysis of mineral exploration datasets, but mapping of geochemical anomalies and prospective areas still usually involved overlaying transparent geochemical map(s) and a geological map on a light table (Carranza 2008). However, in recent years, geospatial information system (GIS)-based mineral prospectivity mapping has been developed as an alternative method for several reasons such as the following: (i) to
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