Ramin Arfania
@khuisf.ac.ir
Department of Geology
Islamic Azad University, Isfahan (Khorasgan) Branch
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Scopus Publications
Mohammad Forouzan and Ramin Arfania
Elsevier BV
Abstract This paper reviews the band's integration of three remote sensing sensors for improving the detecting of hydrothermal alterations. The distinguishing feature of the various minerals has always been the challenge of Multispectral sensors due to the band's limitation. On the other hand, accessibility to Hyperspectral data requires paying a high cost. Also, the narrower bands in such data and the absence of suitable data to atmospheric correction can cause more errors. So, we hope that providing more bands by this method can detect hydrothermal alteration zones correctly. The integration method acts based on the spectral offset correction on the reflectance data of the images in a log–log plot. The data include bands of ASTER, MSI, and OLI sensors in the SWIR spectral region that are converted to reflectance by 6S atmospheric correction. For the spectral method of mineral detection, we have chosen the Spectral Angle Mapper (SAM) technique. This is a powerful classification to represses the influences of shading, solar illumination, and Albedo effects. Also, we benefit from the Concentration-Area(C-A) fractal model for specifying the range of thresholds. This review emphasizes that although the integration band method can lead to the detection of minerals in hydrothermal alterations, more investigation is still needed to achieve better results because it is unsuccessful to the identification of minerals which lacking the specific spectrum peak in the range of central wavelengths of the integrated bands.
Ramin Arfania and Sohrab Shahriari
Wiley
Geological studies indicate that the southeastern Sanandaj-Sirjan Zone, located in the southeastern Zagros Orogenic Belt, is subdivided transversally into the Esfahan¬Sirjan Block with typical Central Iranian stratigraphic features and the Shahrekord-Dehsard Terrane consisting of Paleozoic and Lower Mesozoic metamorphic rocks. The Main Deep Fault (Abadeh Fault) is a major lithospheric fault separating the two parts. The purpose of this paper is to clarify the role of the southeastern Sanandaj-Sirjan Zone in the tectonic evolution of the southeastern Zagros Orogenic Belt on the basis of geological evidence. The new model implies that Neo-Tethys 1 came into being when the Central Iran Microcontinent split from the northeastern margin of Gondwana during the Late Carboniferous to Early Permian. During the Late Triassic a new spreading ridge, Neo-Tethys 2, was created to separate the Shahrekord-Dehsard Terrane from Afro-Arabian Plate. The Zagros sedimentary basin was formed on a continental passive margin, southwest of Neo-Tethys 2. The two ophiolitic belts of Naien-Shahrebabak-Baft and Neyriz were developed to the northeast of Neo-Tethys 1 and southwest of Neo-Tethys 2 respectively, related to the sinking of the lithosphere of the Neo-Tethys 1 in the Late Cretaceous. It can be concluded that deposition of the Paleocene conglomerate on the Central Iran Microcontinent and Pliocene conglomerate in the Zagros Sedimentary Basin is directly linked to the uplift generated by collision.