نوع مقاله : علمی-پژوهشی
نویسندگان
1 دانشکده مهندسی معدن، دانشگاه صنعتی امیرکبیر (پلی تکنیک تهران)
2 مرکز تحقیقات فضایی، پژوهشگاه فضایی ایران، تهران
چکیده
کلیدواژهها
موضوعات
عنوان مقاله [English]
نویسندگان [English]
The Zafarghand area is located as a porphyry Cu deposit in the northeast of Isfahan and southeast of Ardestan, which is a part of the Iran-Central structural zone, and more precisely, it is located in the Urmia-Dokhtar volcanic belt. In the porphyry Cu deposits exploration, identifying and determining the alteration zones is of special importance. The aim of the present study is to identify and highlight the alteration zones of Zafarghand area, with the help of fractal geometry in the processing of ASTER images. Accordingly, considering the raster nature and digital form of satellite images, the digital number values of each pixel from the image matrices were considered as samples in a systematic network. Finally, the algorithm of the Concentration-Area (C-A) fractal model was implemented as an efficient method for determining anomaly samples in the set of digital number values of ASTER satellite image pixels. The alteration zones identified by the aforementioned technique based on their expansion in the region represent the very effective performance of this method. So that, especially in the case of phyllic and propylitic alterations, there is a very high correspondence between the results of satellite image processing and the spread of alterations in field studies. The non-identification of potassic and argillic alterations in the obtained results is also directly related to their limited expansion in the study area. The application of fractal C-A method in decision-making, has been successful and has proven to be very effective in determining the alteration zones in the Zafarghand area.
کلیدواژهها [English]
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