Geology, remote sensing, mineralogy, alteration and geochemistry studies in Nakhilab area (southeast of Iran)

Authors

Geology department, sciences faculty, ferdowsi university of mashhad

Abstract

Nakhilab (Nakhileh) area is located in the southeast of Iran and 145 km northwest of Zahedan. Sedimentary units of flysch zone of eastern Iran and porphyry and andesite diorite units are the most important lithological units. All the existing lithological units in this area have been affected by the shearing movements of Nosratabad and Kahorak faults, which have caused the creation of tensile structures in the area and probably facilitated the penetration of diorite units. Field s and laboratory studies showed that the most abundant lithology in the area are hornblende diorite porphyry intrusions and the most important mineralization have occurred there, and the most abundant main minerals are semi-shaped plagioclase crystals (60-75 percent), Hornblende (5-10%), biotite (3-5%), quartz and clinopyroxene (about 5%). In the paragenesis sequence, pyrite, chalcopyrite and sphalerite minerals are in the early stages (hypogene) and bornite, chalcocite and covellite are secondary minerals and supergene stage. RS studies indicate the presence of argillic, propylitic, phyllic and iron oxides alterations. Geochemical investigations showed that the igneous rocks range is from gabbro to granodiorite and the chemical composition of igneous rocks ranges is from basic, medium to acidic, which are mainly diorite, andesite, granodiorite and gabbro respectively. The amount of LREE enrichment is more obvious than that of HREE, these features indicate that the igneous rocks belong to subduction zones. All the samples of the studied in this area located in the arc and the environment of the post collision of the continental margin.

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History

  • Receive Date: 04 July 2023
  • Revise Date: 24 November 2023
  • Accept Date: 27 November 2023

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