GSINET | Geological Survey of Iran , North - East Territory

Writers : Abbasi Nyazabadi, Hossein; Fotouhirad, Gholam Reza; Haj Alilou, Behzad
Refference : 27th Symposium on geosciences and the 13th symposium on geological society of Iran-Tehran
Publishing Year : 1388

Abstract :

Volcanic complex of North Khoor with 7Km2 surface area is located at 90Km of NW Birjand city. The study area is located in Lut-block and map with scale 1:100000 of Sarghenj. The particular characteristics of this zone is great tertiary magmatic activity which start at Eocene (Karaj formation) and in top point including of folding and fracturing of volcanic and pyroclastic units at Oligocene, and intrusion of subvolcanic bodies in this zone that caused to formed dikes. The magmatic series of volcanic rocks are High potassium Calc-Alkaline to tholeiitic and are including andesite-basalt, andesite, trachy andesite, latite, dacite to riodacite, tuff and volcanic breccias.
The copper and iron mineralization has deposited in tuffs and andesites as open space filling and vein-veinlet. The Thin polished samples for fluid inclusion microthermometry selected from cogenetic quartz veins. The studied fluid inclusions have different shapes such as needle, quartz negative crystal, asteroid, triangle and irregular which have high degree of filling and gas and liquid phases and without daughter phase. Furthermore, presence of necking down, elongation and needle shapes in inclusions are demonstrate active tectonism in studied area. Fluid inclusion studies accompany to stratigraphy and petrology evidences suggested salinity 10 percent� equivalent of NaCI, 50Mpa pressure and heat 200-220 degree.

Subject List : Microthermometery, Iron, Copper

Articles

Fluid inclusion microthermometry of Cu-Fe hydrothermal mineralization in volcanic rocks of north Khoor (northwest Birjand)