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Paper Information

Title: 

GEOCHEMISTRY AND ORE POTENTIALS OF ZAGHAR PLUTON AND SKARN, W-TAFRESH

Type: PAPER
Author(s): RAVAGHI AHMAD,ALI REZAEI S.
 
 
 
Name of Seminar: SYMPOSIUM OF EARTH SCIENCES
Type of Seminar:  SYMPOSIUM
Sponsor:  ORGANIZATION OF GEOLOGICAL OF IRAN
Date:  2006Volume 24
 
 
Abstract: 

Zaghar pluton is located 5 km W-SW of Tafresh in Markazi Province. The pluton and related felsic-intermediate dykes are diorite, qurtz-diorite, monzodiorite to granodiorite in composition with sub-alkaline to calc-alkaline affinity, and features characteristic of I- type granitoid series emplaced in a continental magmatic arc.
Zaghar pluton intruded into Triassic calcareous shales and Cretaceous Lst leading to the formation of hornfels, marble and skarn. The skarns are composed mainly of quartz,calcite,epidote,garnet. They are rich in sulfides (pyrrhotite, pyrite, minor chalcopyrite). Pyrrhotite dominates pyrite, implying that ore fluids were reduced. Stream sediments originating from skarns contain 20-200 ppb gold. Heavy mineral concentrates contained up to 25 gold particles 100–250 µm in size. Chip samples from mineralized skarn yielded 100 to 2500 ppb gold.
The geochemistry of Zaghar pluton suggests that theparent magma was not much fractionated, making the pluton potentially favorable for Fe, Cu, Au skarns (Meinert 1990). Considering the reduced nature of the ore fluids, copper becomes less important, but potentials for gold increase; this is consistent with the stream sediment and ore analyses. Reduced gold skarns are an important source for gold; this makes Zaghar a promising target for further explorations.

 
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