Scientific Quarterly Journal of Geosciences

Scientific Quarterly Journal of Geosciences

Remote Sensing Studies of Alteration Zones in Dahaneh Qaleh Exploration Prospect, Northwestern Bardeskan

Document Type : Original Research Paper

Authors
Kh. Ebrahimi 1
p. Roohbakhsh 1
S. M. Homam 2
H. Abbasnia 3
1 Department of Geology, Ferdowsi University of Mashhad, Mashhad, Iran.
2 Department of Geology, Ferdowsi University of Mashhad, Mashhad, Iran
3 Khorasan Razavi Organization of Industries & Mines, Mashhad, Iran.
10.22071/gsj.2012.53981
Abstract
Dahaneh Qaleh exploration prospect is located about 300 km southwest of Mashhad and 50 km northwest of Bardeskan. The exploration prospect is also a part of Taknar massive sulfide mineralization zone and lithology of the area consists of chlorite sericite schist, biotite sericite schist and sericite schist with metamorphosed basic and intermediate igneous rocks in the type range from meta-gabbro diorite to meta-diorite that they belong to Taknar Formation.Taknar Formation was intrusived by low grade metamorphosed intermediate subvolcanic intrusive rocks with porphyry texture in the type range of meta-hornblende-quartz monzonite porphyry, meta-hornblende-quartz monzodiorite porphyry, meta-hornblende monzodiorite porphyry, meta-quartz monzonite porphyry and meta-hornblende-quartz monzosyenite porphyry. All of the geological unites are affected by moderate to severe alteration and sulfide minerals including pyrite, were transformed to secondary iron oxides due to oxidation. Before the field investigation, ETM+ and ASTER sensors data were processed with "color composition of band ratios", "standard and selective principal component analysis" methods and finally "spectral angle mapping" as a successful method for more accurate separation of altered minerals that introduced Hematitic, Chloritic, Epidotic, Sericitic and Silicification alteration zones in the study area. Accuracy of the processes were proved by the following field,  petrography and mineralography studies.
Keywords
Dahaneh Qaleh exploration prospect
Landsat
Aster
Alteration
Bardeskan
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Scientific Quarterly Journal of Geosciences
Volume 21, Issue 84
Autumn 2012
Pages 199-208