GEOLOGY, PETROGRAPHY AND PRECIOUS METAL MINERALIZATIONS OF ALTINTEPE AND ÇİLEKTEPE SECTORS OF KARŞIYAKA ORE OCCURRENCES, IZMIR, TURKEY

Authors : İ. Sönmez SAYILI, Şener GONCA

Pages : 33-49

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Publication Date : 1999-02-01

Article Type : Research Paper

Abstract :As result of geologic studies on the field and microscopic studies of the samples from Altıntepe and Çilektepe areas located southwest of Sancaklı village, Karşıyaka-İzmir, dacitic tuffs and lavas and their silicified types, biotite-hornblend-dacite. andesitic lava, tuff and agglomeras in addition to andesitic dykes are determined and mapped. Investigations indicate two different type of mineralizations, First type is gold and silver mineralizations in quartz veins emplaced in tension fractures of silicified dacitic lavas at Altıntepe (Arapdağ) sector. The other kind of mineralizations is related to hydrothermal alterations in dacitic tuffs at Çilektepe (Çerkeskayası or Pilavtepe) sector. Gold mineralizations are developed as stockworks and disseminations in those kind of rocks because uprising channels are tapped by silica gels. The age of volcanism based on regional geological data is between Late Oligocene and Middle Miocene. Biotite-hornblende-dacites (14.7+0.5 Ma) contain no precious metal mineralizations and are believed to occur after ore mineralizations. According to these findings, the mineralizations should be Middle Miocene in age.
Keywords : GEOLOGY, PETROGRAPHY, PRECIOUS METAL