Evaluation of the tectonic activity of faults with mineral alterations: a case of the East Anatolian Fault-Palu segment, Türkiye

Yıl 2024, Cilt: 175 Sayı: 175, 149 - 165, 05.12.2024

Firdevs Güzel , Gülcan Sarp

https://doi.org/10.19111/bulletinofmre.1518855

Öz

Palu segment is a part of the East Anatolian Fault Zone (EAFZ), the most important active left-lateralstrike-slip fault system in Turkey, and there are different mineral alterations in this zone. The study
tested the spatial relationship between tectonic activity and mineral alterations with the Getis-OrdGi* statistic in and around the Palu segment. Mineral alterations at the pixel level were determined
from ASTER images by Ratio, Relative Band Depth (RBD), Mineral Indices, CROSTA, ConstrainedEnergy Minimization (CEM), Mixed Tuned Matched Filter (MTMF) methods. According to the results, the spatial distribution of alteration minerals extend parallel to tectonically active fault lines and/or partially bounded by faults in the area. RBD, Mineral Indices, CROSTA, CEM, and MTMF image processing algorithms applied in the study gave consistent results in the spatial determination and mapping of mineral alterations. At 99% and 95% confidence intervals, statistically significant
cold spot clusters indicate the proximity of alterations to faults concentrated around fault lines. This degree of clustering of mineral alterations indicates regions with high alteration rates close to fault lines and areas with tectonic activity along fault lines.

Anahtar Kelimeler

Active Tectonics, Alteration Minerals, Getis-Ord Gi* Statistic, ASTER.

Kaynakça

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