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Geology, Mineralization, Alteration and Geochemical Exploration in Kajeh area, Ferdows
, , , , ,
Volume 16, Issue 2 (7-2008)
Abstract

The study area is situated within the Lut Block 50 Km northeast of Ferdows. The oldest exposed rocks are Cretaceous limestone. Kerman conglomerate cover the limestone. Dacite-rhyodacite lava and pyroclastic rocks erupted over Kerman conglomerate.  Volcanic activities took place at different time in Tertiary. The composition ranges between trachyandesite, andesite, andesite-basalt and rhyolitic tuff. Sub-volcanic diorite, monzodiorite, monzonite, quartz monzonite and granite porphyry intruded the volcanic rocks during Oligo-Miocene time.  Both volcanic and intrusive rocks are K-rich calc-alkaline to shoshonitic. Intrusive rocks (except granite porphyry) are I-type granite and belong to magnetite series. The pattern of spider diagrams both volcanic and intrusive rocks are similar. In comparison with mantle, They are enriched in Cs, K, Rb, La and Zr and depleted in Ba, P and Ti. Two groups of alteration zones are recognized: 1- silicified assemblages (silica-sericite-propylitic, silica-propylitic & silica- sericite). This group is related to granitic magma. 2- propylitic-sericitic-argillic group which are associated with monzonite, quartz monzonite-diorite intrusive rocks. Mineralization associated with granite porphyry show Mo, Ag, Pb and Zn anomalies. Mineralization associated with monzonite, quartz monzonite-diorite show signs of porphyry copper. They have Cu, Au, Pb and Zn geochemical anomalies.


Geology, mineralogy and fluid inclusion studies of the Kajah deposit, northwest of Ferdows, South Khorasan
Sedigheh Zirjanizadeh, Roholah Miribedokhti,
Volume 32, Issue 2 (7-2024)
Abstract
The study area is situated within the Lut Block, 40 Km northeast of Ferdows. The
oldest exposed rocks are Cretaceous limestone. The composition ranges of Volcanic rocks between andesite, andesite-basalt and rhyolitic tuff. Sub-volcanic diorite porphyry intruded in the volcanic rocks. Alteration zones are propylitic, silicified and argillic around the vein and surrounding host rocks. Sulfide minerals include pyrite, galena and sphalerit the secondary minerals comprise covelite, malachite, azurite, chrysocolla, hemimorphite and iron oxides. The veins contain an average of 2.14 percent of lead and 4.40  percent of zinc. Fluid inclusion petrography and microthermometry results reveal that the fluid inclusion assemblages developed in the different types, including single-phase vapor fluid inclusion, vapor-rich two-phase fluid inclusions and liquid-rich two-phase fluid inclusions. On the basis of fluid inclusion studiel,  the ore-forming fluids has temperature 204–321 °C), and salinity 6.2–15wt% NaCl equiv. Fluid boiling and mixing most likely were the vital factors controlled the metal precipitation. The fluid pressure during the formation of the ore minerals was estimated to be between 50 to 150 bars. Based on the data obtained from fluid inclusions, it is suggested that the ore minerals were formed at a depth of 700 meters below the old water table
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