M.Sc. Tezi Görüntüleme | |||||||||||||||||||||
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| Summary: Mineralogical and Geochemical Investigation of Eriklik (Bulancak, Giresun) Area Volcanics and Clay Occurrences In the Eriklik area, five clay occurrences are described. Major clay mineral is illite with accompanying kaolenite in Kuruköseoğlu, Akyar, Kandaz and Kuşluhan occurrences whereas smectite in Kalecik occurrence. Non-clay minerals are represented by opal-CT, cristobalite, rarely calcite, biotite and K-feldspar. Galena and sphalerite veins formed along the fracture systems and pyrite were also determined. The clay rich samples have high Al, K, Ba, Zr, Rb and Sr contents and low P, Mn, Ca, Th and Eu. In the binary element plots, positive correlations of Al2O3 and K2O with SiO2 are interpreted as illite formation whereas high CaO and low K2O values accompanying high Al2O3 contents imply smectite formation in these rocks. Scattering patterns were observed such element Na2O and TiO2 that may not take part in the clay mineral structure. In the light of the mineralogical, petrographical observations and geochemical data, it is revealed that Eriklik-Bulancak (Giresun) clay occurrences were formed by interaction of the volcanics with hydrothermal fluids along NE-SW and NW-SE directed fracture systems. Keywords: Alteration, Clay, Illite, Kaolinite, Smectite, Dacite, Tuff, Eastern Pontide | |||||||||||||||||||||