AN EXAMPLE TO THE JASPEROIDAL-TYPE EPITHERMAL MINERALIZATION FROM THE WESTERN ANATOLIA: DEĞİRMENCİLER ANTIMONY MINERALIZATION (SİMAV, KÜTAHYA)

Year 1999, Volume: 121 Issue: 121, 31 - 32, 01.02.1999

Vedat Oygür Ayhan Erler

Abstract

Değirmenciler antimony
mineralization consists of the stibnite-bearing quartz veins emplaced within
the marble lenses of the biotite-gneisses which are at the bottom of the
stratigraphical sequence of the Simav region. Quartz veins formed both as the
replacement of and open-space filling in the limestone cut the schistosity of
the host rock and crop out in accordance with it. Limestones were decalfied
before the mineralization along the faults and later, transformed to jasperoid
as a consequence of the replacement of calcite by silica. Intermediate and
advanced argillic alterations consisting of the montmorillonite. smectite,
dickite. quartz. opaline-CT and cristobalite developed on the wall rock.
Halotrichite which represents the acid leaching zone of the hydrothermal
alteration presents as well. Comb, cockade and banded textures as colloform and
crustiform are widespread within the silicified rock. Hydrothermal breccias
with black silica matrix and partly abundant pyrite are observed at the
mineralized parts. Pyrite and graphite accompany the stibnite in the veins. In
addition, galena, sphalerite, molybdenite, bismuthinite. gold and silver in
lesser amounts are associated with the mineralized veins. Homogenization
temoeratures measured from the fluid inclusions of the quartz crystals vary 200
to 3100 C and signify the deeper parts of an epithermal system. The association
of stibnite and molybdenite in the veins points out that the hydrothermal
solutions could have gained their metal content from the magmatic emanations.
Therefore, it is suggested that the ore-bearing fluids has a genetical
relationship with a buried granitoid stock which is represented by the dacide
porphyries cropping out near the mineralization. However, graphite, rutile and
anatase which are in the content of the vein show an addition to the
hydrothermal solutions during their ascension as a leaching from the wall
rocks.

Keywords

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