Genetic Investigation and Comparison of Kartaldağ and Madendağ Epithermal Gold Mineralization in Çanakkale Region
Tez Türü: Yüksek Lisans
Tezin Yürütüldüğü Kurum: Orta Doğu Teknik Üniversitesi, Mühendislik Fakültesi, Jeoloji Mühendisliği Bölümü, Türkiye
Tez Danışmanı: Nilgün Türkan Güleç
Tezin Onay Tarihi: 2010
Tezin Dili: İngilizce
Özet:
This thesis study is concerned with the genetic investigation of two epithermal gold
deposits (Madendağ and Kartaldağ) in Çanakkale, NW Turkey. The methodology
comprises field and integrated laboratory studies including mineralogic-petrographic,
geochemical, isotopic, and fluid inclusion analysis.
Kartaldağ deposit, hosted by dacite porphyry, is a typical vein deposit associated
with four main alteration types: i) propylitic, ii) quartz-kaolin, iii) quartz-alunitepyrophyllite,
iv) silicification, the latter being characterized by two distinct quartz
generations as early (vuggy) and late (banded, colloform). Primary sulfide minerals
are pyrite, covellite and sphalerite. Oxygen and sulfur isotope analyses, performed on
quartz (δ18O: 7.93- 8.95 ‰) and pyrite (δ34S: -4.8 ‰) separates, suggest a magmatic
source for the fluid. Microthermometric analysis performed on quartz yield a
temperature range of 250-285 ºC, and 0-1.7 wt % NaCl eqv. salinity.
Madendağ deposit, hosted by micaschists, is also vein type associated with two main
alteration types: illite and kaolin dominated argillization and silicification, characterized by two distinct quartz phases as early and late. Oxygen isotope
analyses on quartz (δ18O: 9.55-18.19 ‰) indicate contribution from a metamorphic
source. Microthermometric analysis on quartz yield a temperature range of 235-255
ºC and 0.0-0.7 wt % NaCl eqv. salinity.
The presence of alunite, pyrophyllite and kaolinite, vuggy quartz and covellite
suggest a high-sulfidation epithermal system for Kartaldağ. On the other hand,
Madendağ is identified as a low- sulfidation type owing to the presence of neutral pH
clays and typical low temperature textures (e.g. colloform, comb, banded quartz).