Tez özetleri Astronomi ve Uzay Bilimleri Anabilim Dalı 2

Geologıcal And Geochemıcal Investıgatıaon Of The Skarn-

Type Iron Ore Deposıts Of The Kirazören Regıon, Bulancak, Giresun
This study aims to examine the formation of the skarn-type iron deposites in the Kirazören region (Giresun, Bulancak).
The stratigrapic units in the study area consist of andesitic volcano-sedimentary rocks of Upper Cretaceous age, trachyandesite of Middle Eocene age, Bektaşyayla kuvars monzonite of Middle Eocene age and Çambaşı kuvars siyenite of post Middle Eocene aged.
The skarn- type Kirazören iron ore mineralization is located mostly around of the contact between the post Middle Eocene - aged Çambaşı kuvars syenite and limestone blocksof Upper Cretaceous. The mineralization occur in brown-green colored garnet and epidot-bearing skarn zone. Because of calcium contents has calcic exoskarn scarn mineralogy.Within Çambaşı kuvars syenite and in peripheral zones of developing endoskarn epidote composition. If exoskarn zone presents garnet-epidote and mahnetite zoning. Because of the copper in iron ore to reach 2% and prevelance, so we can say the Fe-Cu skarn for the formation.
Primary (oxide minerals), secondary (sulfide minerals)and supergene mineral paragenesis in the skarn was determined by the ore microscopy studiesIn magnetite minerals is seen a zonation from the core towards the edge zones. This zonation formed likely silica-rich solution environment with the introduction around the core of the primary magnetite as crystal growth is arising.
According to the geochemical analysis of ore samples, Fe is positively correlated with the Na and Cl. This situation may have been indicate that Na and Cl ions were rich in the mineralizing fluids,and they may have played a role in transportation and deposition of iron from the highly saline fluids.
δ34S(CDT) values of pyrite and chalcopyrite in the magnetite ore arerange between -0,04 and 1,76. This datamay indicate a magmatic origin for sulphure.
As a result of fluid inclusion studies from garnet and epidote minerals, LVS+LVMS-type fluid inclusions in garnet minerals were decrepitated between 360 and 400 oC temperatures. This situation indicates that the iron ore mineralization was formed above this temperatures with high salinity conditions. So, we can say % NaCl equivalent salinity is higher than the halite mineral’s crystallization density (26,3%).

 

TOKSOY Bilgehan

Danışman : Yard. Doç. Dr. Özlem BULKAN

Anabilim Dalı : Jeoloji Mühendisliği

Programı : -

Mezuniyet Yılı : 2014

Tez Savunma Jürisi : Yard. Doç. Dr. Özlem BULKAN

Prof. Dr. Hayrettin KORAL

Prof. Dr. Sabah YILMAZ ŞAHİN

Prof. Dr. Süleyman DALGIÇ

Doç. Dr. Erol SARI