Journals / Yerbilimleri / 2017 / Cilt: 38 - Sayı: 3

Landsat-8 verileri ile Zahedan'ın kuzeyi, GD İran'da Cu-Mocevherleşmelerine bağlı alterasyon zonlarının uzaktan algılama ile tespiti

Remote sensing detection of altered zones associated with Cu-Momineralization in North of Zahedan, SE Iran using Landsat-8 data

Pages
275–294
DOI
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AI Summary & Key Takeaways

AI Insight
⚡ TL;DR(Too Long; Didn't Read)

These methods enabled us to identify the first Cu-Mo porphyry system in southeastern part of Iran before costly-detailed ground investigations

📌 3 Key Takeaways

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Objective & Hypothesis:Hydrothermal alteration zones have highlighted role in prospecting mineral deposits.
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Key Findings & Data:In this study and at the first stage, we used image processing techniques on the Landsat-8 image which covered the Lar area located in southeastern part of Iran.
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Conclusion & Impact:These methods enabled us to identify the first Cu-Mo porphyry system in southeastern part of Iran before costly-detailed ground investigations
🔬Design:Research Article
📍Scope:Comprehensive Sample
⚙️Variables:Domain Parameters

Abstract

Hydrothermal alteration zones have highlighted role in prospecting mineral deposits. In this study and at the first stage, we used image processing techniques on the Landsat-8 image which covered the Lar area located in southeastern part of Iran. We applied the color composite, band ratio, Crosta and LS-Fit methods, high-pass directional filtering, and photolineament factor methods. The color composite and band ratio methods clearly showed the hydrothermal altered areas of clay minerals and iron oxides that are in compliance with the maximum amount of fractures. Both LS-Fit and Crosta methods enabled us to represent and acknowledge the altered hydroxyl and iron-oxide minerals in the study region. Finally, the high-pass directional filtering and photolineament factor methods were administered to map the geological structures and to determine the intense influences of hydrothermal fluids location. In the second stage, based on field observation, we managed to determine hydrothermal alterations as silicic, potassic, argillic, propylitic and phyllic without any normal zonation of porphyry deposits. Altered and mineralized area has an oval shape, with a NW-SE strike, mainly concentrated in the southwest of the Lar igneous complex. Mineralization often occurs in syenitic to monzonitic intrusions and in association with silicic veins and veinlets. Consequently, the results of image processing techniques showed high efficiency for mapping hydrothermal altered areas especially iron-oxide minerals which are alteration products of hydrothermal sulfides. These methods enabled us to identify the first Cu-Mo porphyry system in southeastern part of Iran before costly-detailed ground investigations

Özet

Maden yataklarının aranmasında hidrotermal alterasyon zonları önemli rol oynamıştır. Bu çalışmada ve öncelikle, İran'ın güneydoğusunda yer alan Lar bölgesinde Landsat-8 görüntüsü ile görüntü işleme teknikleri kullanılmıştır. Renkli karışım (color composite), band oranı, Crosta ve LS-Fit yöntemleri, yüksek geçiren filtreleme ve fotoçizgisellik yöntemleri kullanılmıştır. Renkli karışım ve band oranları kil ve demir oksit mineralli hidrotermal bozunma alanlarının en fazla kırıklanmanın olduğu zonlara karşılık geldiğini açıkça ortaya koymuştur. LS-Fit ve Crosta yöntemleri çalışma alanındaki hidroksil ve demir oksit minerallerinin yerlerinin saptanmasına yardımcı olmuştur. Sonuçta, yüksek geçiren filtre ve fotoçizgisellik yöntemleri jeolojik yapılarla hidrotermal akışkanların en yoğun olduğu zonların bulunmasında kullanılmıştır. İkinci aşamada, porfirik yataklarda bir anormal zonlanma göstermeyen silisik, potasik, arjillik, propilitik ve fillik hidrotermal bozunmaların saptanması ele alınmıştır. Bozunmuş ve mineralize olmuş alan KB-GD doğrultulu ve eliptik şekilli olup Lar magmatik karmaşığının güneybatısında zenginleşmiştir. Mineralizasyon sıklıkla silisli damar ve damarcıklara bağlı siyenitik ve monzonitic sokulumlara bağlıdır. Dolayısıyla görüntü işleme teknikleri özellikle hidrotermal sülfitlerin bozunma ürünleri olan demir oksit minerallerinin haritalanmasında çok etkili olmuştur. Bu yöntemler güneydoğu İran'da masraflı ayrıntılı yer çalışmaları öncesinde ilk defa Cu-Mo porfiri sisteminin saptanmasını sağlamıştır

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Cite This Article

MORADI, R., BOOMERI, M. (2017). Landsat-8 verileri ile Zahedan'ın kuzeyi, GD İran'da Cu-Mocevherleşmelerine bağlı alterasyon zonlarının uzaktan algılama ile tespiti. Yerbilimleri, Cilt: 38 - Sayı: 3, 275–294. https://ajindex.com/articles/332465

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