Regional Integrated Structural and Alteration Analysis of Magnetic and Infrared Remote Sensing Data from the Kerman Belt, Iran

Author(s): 
Anna Fonseca, A Miscovic, James Siddorn, S. Monoury, M. Rahimi
Date: 
Monday, September 26, 2016
First presented: 
Society of Economic Geologists Conference - Tethyan Tectonics and Metallogeny
Type: 
Presentation
Category: 
Geology

SRK NA Paper of the Year - 2016

A method for integrating structural and alteration interpretations based on regional remote sensing magnetic and infrared spectral data is presented. The aim of the integrated interpretations is to provide insight on the controls that basement structural architecture exert over porphyry mineralization. The method is illustrated by a study of the porphyry-endowed Kerman belt of Iran, for which structural interpretations of EMAG2 first vertical derivative magnetic data were refined using alteration lineaments interpreted from Landsat-8 infrared spectral data.

Previous structural and alteration interpretations of remote sensing data for the Kerman belt focused on combining surficial structural interpretations of satellite imagery and hydrothermal alteration minerals directly associated with mineralization. Our method makes use of regional linear alteration trends indicative of lithological discontinuities to refine and to enhance the understanding of deep seated structures interpreted from regional magnetic data.

The integrated structural and alteration analysis of the Kerman belt of Iran highlights a first order fault that is interpreted continuously at depth over approximately 500 kilometers and shows good spatial correlation with the location of most porphyry deposits and prospects. The analysis also allowed for the visualization of a pre-mineralization regional dilational zone that hosts the most prolific portion of the Kerman porphyry belt.

 

Feature Author

Anna Fonseca

Anna Fonseca is a Principal Geological Consultant with SRK, based in the Toronto office. Anna has over 20 years of geological work experience in the mineral industry, government geological surveys, and universities. In the last decade she focused on alteration mapping and modelling. Anna’s experience includes regional to property scale mapping, structural and alteration interpretations of remote sensing data, regional GIS compilation and targeting, geochemical survey design, and formulation of geochemical QA-QC and borehole logging protocols. She worked in various hydrothermal deposit styles, including porphyry-epithermal, IOCG, skarn, CRD, orogenic gold, Carlin, and VMS. She taught field-based and classroom style mapping, alteration, and exploration methods courses in university and to industry.

 

 

 

Principal Geologist
MSc, PGeo
SRK Toronto
Dr. James Siddorn

James Siddorn is an expert in the geological interpretation of remote sensing data, in particular the structural geological interpretation of aeromagnetic data. He has completed numerous multifaceted interpretations in support of gold, uranium, and Ni-Cu-PGE exploration as well as many geotechnical and hydrogeological evaluations. James is a recognized leader in this field and has taught several courses and been an invited speaker on applied aeromagnetic interpretation. He has also taught more than 30 applied structural geology courses internationally to over 1,500 exploration and mining geologists and engineers.

In May, 2013, James was recognized by the Canadian Institute of Mining, Metallurgy and Petroleum with the Past Presidents’ Memorial Medal “for leadership and excellence in the field of Structural Geology”.

Remote Sensing Specialist
PhD, PGeo
SRK Toronto
SRK Worldwide