ALTERATION ZONES ASSOCIATED WITH EOCENE MAGMATISM IN THE OLUR (ERZURUM) AREA, EASTERN PONTIDES AND THEIR SIGNIFICANCE

Year 2017, Volume: 155 Issue: 155, 223 - 253, 03.12.2017

Güzide Önal Mustafa Akyıldız , İsmet Cengiz Mehmet Aslan Serkan Özkümüş

https://doi.org/10.19111/bulletinofmre.365251

Cited By: 1

Abstract

The Alpine Orogenic Belt with numerous porphyry Cu-Mo-Au mineralizations, starts from Eastern
Europe continues through Turkey and the Caucasus and extends into Iran and Afghanistan. The study
area of the Eastern Pontides is in this orogenic belt. Using fi eld and laboratory studies an attempt has
been made to establish the origin of Yeşilbağlar, Kaban and Köprübaşı alteration zones in the Olur
area (Erzurum). In the study area Early Eocene Coşkunlar volcanics and sub volcanic rocks have
contact with the Oltu çayı volcanics of Early-Middle Jurassic. Alteration in the study area effects these
Oltuçayı and Kaban volcanics. In the study area mineralizations are present in the alteration zones.
Disseminated, stockwork, vein/veinlet and fi ssure type mineralizations are present in the Coşkunlar
dacite. Paragenesis in the alteration zones are pyrite, chalcopyrite, sphalerite, galena, pyrrohotite,
quartz, calcite and barite. FT-IR and XRD studies showed the presence of clay, sulphate, sulphur,
carbonate, silicate and oxide minerals in the alteration zones. Field and petrographical studies
showed that alteration types in the Yeşilbağlar, Kaban and Köprübaşı areas are, advanced argillicargillic,
pyropylitic and sericitic. They are similar to the alterations present in the upper part of the
mineralizations in the porphyry systems of the Alpine Orogenic Belt. In the Eastern Pontides starting in
Early Jurassic, continuation of subductions resulted in closure of the İzmir-Ankara-Erzincan ocean and
in Early Eocene the Taurid platform collided with the Eurasian active continental margin. Data from
the study area indicate the presence of alteration zones in the upper part of the buried porphyry system
and the possibility of mineralized parts in the deeper parts of the system.  

Keywords

Eastern Pontides, Early Eocene, Porphyry system, Alteration, FT-IR, XRD.

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