بارزسازی کانه‌زایی روی - سرب و دگرسانی‌های همراه در کانسار مهدی‌آباد، استان یزد، با استفاده از تصاویر ماهواره‌ای استر و لندست8 OLI-

نوع مقاله : مقاله پژوهشی

نویسنده

دانشگاه بین المللی امام خمینی (ره)

چکیده

کانسار روی- سرب مهدی‌آباد در شرق شهرستان مهریز، کانساری با میزبان کربناتی است که در دولومیت‌های سازند تفت جای دارد. این کانسار از بخش‌های اکسیدی-کربناتی و سولفیدی تشکیل شده است. برای بارزسازی پهنه­های مختلف کانه‌زایی و دگرسانی‌های همراه، روش‌های مختلف پردازشی بر تصاویر چندطیفی استر و لندست 8-OLI اعمال شد. در بارزسازی پهنه­های کانه‌زایی و دگرسانی‌های همراه در تصاویر OLI، روش‌های تحلیل مولفه‌های اصلی، تحلیل مولفه‌های مستقل و ترکیب‌های بندی بر پایه نسبت‌های نواری عملکرد خوبی دارند. در تصاویر استر، بهترین نتایج از روش‌های تحلیل مولفه‌های اصلی و جداسازی طیفی خطی به دست آمد. بر پایه نتایج به دست آمده، در مناطقی که پهنه گوسان و دگرسانی سیدریتی هم‌پوشی دارند، کانه‌زایی روی- سرب صورت گرفته است. درستی نتایج این پردازش‌های طیفی با بررسی های میدانی و نتایج پراش پرتو ایکس نمونه‌ها تایید شد.     

کلیدواژه‌ها

عنوان مقاله [English]

Detection of zinc-lead mineralization and associated alteration in the Mehdiabad deposit, Yazd province, using ASTER and Landsat 8-OLI satellite images

نویسنده [English]

  • Zahra Bonyadi
چکیده [English]

The Mehdiabad zinc-lead deposit, which is located at the East of Mehriz city, is a carbonate-hosted ore deposit lying in the dolomitic rocks of Taft Formation. This deposit is composed of oxide-carbonate and sulfide ores. Different spectral processing techniques were applied to ASTER and Landsat 8-OLI multispectral images to detect different mineralization zones and associated alterations. In OLI image, Principal Component Analysis, Independent Component Analysis, and Band Combinations consisting of Band Ratios were successful for detecting mineralization zones and associated alterations. In ASTER image, the best results were obtained from Principal Component Analysis and Linear Spectral Unmixing methods. Based on the results of this study, zinc-lead mineralization occurred in the areas where gossan and siderite alteration zones overlap. The results of the spectral techniques were confirmed by field studies and X-Ray Diffraction analysis of the obtained samples.

کلیدواژه‌ها [English]

  • Zn-Pb mineralization
  • alteration
  • detection
  • Aster
  • OLI
  • Mehdiabad deposit

مراجع

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  • تاریخ دریافت: 04 آبان 1398
  • تاریخ بازنگری: 03 آذر 1398
  • تاریخ پذیرش: 25 دی 1398

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