Maden, N.; Akaryali, E.; Aydınçakır, E.

Eastern Pontide orogenic belt located in the Alp-Himalayan fold belt is divided into three subzones such as northern, southern and axial zones. These zones are controlled by the NE, NW and E-W directed fault systems. The study area whose geodynamic evolution is still debated is situated in the southern zone of the Eastern Pontide Orogenic belt. The views proposed for the geodynamic evolution of the eastern Pontides can be grouped into three. The geodynamic evolution of the region and genesis of the volcanic rocks are evaluated with a total 305 gamma ray spectrometer measurements surveyed at the Tertiary aged rocks in the Gümüşhane area. Total abundances of thorium ranges from 0.12ppm to 2.97 ppm, from 0.27ppm to 2.32 ppm for uranium, and from 0.09 % to 8.72 % for potassium. The average contents of radioelement concentrations computed over all measurements is: 0.85 (±0.33sd), 1.2(±0.54sd) ppm and 0.57 (±0.63sd) %, for U, Th and K, respectively. Numerical results verify that the parental magma of the Tertiary aged volcanic rocks probably derived from an enriched mantle originated from upper continental crust, previously metasomatized by subducted derived fluids..

Maden, N.; Akaryali, E.

The gamma ray spectrometry has been widely used in mineral exploration, geological mapping and environmental radiation monitoring.The Eastern Pontide orogenic belt, which constitutes an important part of the Alpine-Himalayan system, hosts various types of economic mineral deposits of massive sulfide, porphyry copper, skarn, and epithermal vein-type ore deposits. Potassium is generally the most useful pathfinder element for gold mineralization zones. High level K/eTh, K/eU and Efimov F-Parameter (KeU/eTh) anomalies showed the alteration zones transmitting hydrothermal ore solutions to the surface. As a result, the gamma ray spectrometry, which is fast and economics method, might be used for estimation of prospective Au ore zones associated with the K alteration.

Akaryali, E.; Tüysüz, N.

Arzular (Gümüşhane, KD Türkiye) epitermal altın cevherleşmesi, Eosen yaşlı Alibaba Formasyonu içinde KD-GB doğrultulu KB'ya eğimli ve yaklaşık DB doğrultulu K'ye eğimli damarlara fay kontrollü olarak yerleşmiştir. Sahadaki asıl cevherleşmeler Kuzdağı Sırtı mevkiinde K70D doğrultu bir kırık zonu içinde gelişmiştir. Cevherli silis damarları 0.1-0.3 m kalınlığında olup devamlılık göstermezler. Cevherleşmede yaygın olarak boşluk dolgusu ve bantlı yapı gözlenmektedir. Ana cevher minerallerini galen, sfalerit, pirit, kalkopirit ve tetrahedritle birlikte eser miktarda altın oluşturmaktadır. Kütle değişim hesaplamalarına göre cevherden yan kayaca doğru kuvars, serizit, K'lu Feldspat kaolinit, Fe Klorit, albit, Mg klorit ve epidot en yaygın gözlenen alterasyonun mineralleridir. Damara dik bir hat boyunca örneklenen profillerde hareketsiz elementler Zr, Hf, Nb, Al ve Ti'dir. Bu hareketsiz elementler ile yapılan nispi (%) ve net (g/100g) kütle değişim hesaplamalarına göre; 1, 3 ve 5 nolu profillerde net kütle artışı, 2 ve 4 nolu profillerde ise net kütle kaybı söz konusudur