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Landsat 7 ETM+ ve ASTER Görüntüleri ile Yusufeli-Tekkale (Artvin-KD Türkiye) Çevresindeki Hidrotermal Alterasyonların İncelenmesi

İnceleme alanı Doğu Pontid metalojenik kuşağının doğusunda yeralır. Doğu Pontid metalojenik kuşağı volkanik masif sülfit (VMS), porfiri Cu-Mo, epitermal, skarn, kromit gibi cevher oluşumları açısından önemli bir potansiyele sahiptir. Bu çalışmada, inceleme alanında VMS tipi cevher oluşumları ile ilişkili hidrotermal alterasyon özellikleri, Landsat 7 ETM+ ve ASTER görüntüleri ile ASD Fieldspec Pro spektrometre kullanılarak incelenmiştir. Hidrotermal alterasyonları belirlemek için bant oranlama metodu her iki görüntüye uygulanmıştır. Ayrıca Landsat 7 ETM+ uydu görüntüsü Crosta Tekniği ve ASTER görüntüsü Eşlenen Filtreleme (MF) metotları kullanılarak analiz edilmiş ve bölgedeki cevher oluşumları ile ilişkili arjilik alterasyon, silisleşme, demir oksitleşme gibi hidrotermal alterasyon alanları haritalanmıştır. Görüntü analizleri ile elde edilen sonuçlar, coğrafi bilgi sistemleri (CBS) yardımıyla değerlendirilerek özellikle VMS tipi cevher oluşumları açısından önemli olan hidrotermal alterasyonların potansiyel hedef alanları belirlenmiştir. Özellikle Üst Kretase yaşlı dasitik volkanik birimlerde yaygın arjilik alterasyon alanları ayırt edilmiştir. Ayrıca bazı bölgelerde alunit/kaolinit ve silisleşme anomali alanları, arjilik alterasyon ile alansal olarak ilişkili ortaya çıkmıştır. Belirlenen hidrotermal alterasyonların yaklaşık KD-GB doğrultusunda dağılımı karakteristik bir özellik olarak görülmüştür.

Anahtar Kelimeler:

Landsat 7 ETM+, ASTER, Yusufeli-Tekkale (Artvin), hidrotermal alterasyon

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