FORMATİON OF TÜRKMENTOKAT-KARATEPE (ESKİŞEHİR) MAGNESITE ORE BEDS

Year 1990, Volume: 110 Issue: 110, 60 - 60, 01.03.1990

Kadir Sarıiz

Abstract

Magnesite ore has a tendancy to settle in the F. W directcd cracksand fissurcs developed strictly under structural
control of serpentines and comprises vein and lensoid beddings; in addition, it is observed that it shows transitions to irregular and
stockswork beddings. Two different mineral associations were found after analyzing the samples taken from the veins and the
lenses. The first one is the primary association, magnesite and quartz and the other is the secondary association, calcitc and dolomite.
The mineral content of the samples have been figured out from their basic element analysis and seemed that magnesite
shoe s 91.74%, cjuartz 0.74 %, dolomite 2.42 %, calcite 1.1 7 % and serpentine shows 1.72 % average values. Because the magnesite
ore with having concentric and colloform structure refiects a rhythmi c dcposition in a gel like colloidal media, the physicochemical
environmental behavior of solutions containing water with CO2
(Mg , dissolved from serpentines, is included) have been
investigated, the experimental Studies on the MgO—SiO2
- CO2
- H2O and the MgO— CO2
-H2O systems have been performed.
According to this, the observed primary mineral association of the ore bed seems to be the product of the MgO—SİO2— CO2
—
H2O system, it is determined that the magnesite ore has formed under 150 C thermal and 2000 bar liquid pressured conditions
with various mole fractions of CO2 When the magnesite ore, bedded as batroidal and concretional masses on the surface (around
Sığıryatağı hill and other small occurrences) and in the shallow depths (near 12 meter), in the MgO— CO2— F2O system is taken
into consideration and evaluated, it is presumed that the magnesite ore might have formed from the mineral deposits containing
Mg (OH)2
or 3 Mg (OH) 3
-3H2O in their compositions. According to the data given above, the formation of the local
magnesites reveals two different facts. The first is having a hydrothermal origin, the sccond is being an infiltration type gel magnesite
deposition which its process is stili Continuing and will continue.

Keywords

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