Investigation of geological and geomechanical properties of the saraftepe (Trabzon) tephritic sill [Saraftepe (trabzon) tefrit silinin jeolojik ve jeomekanik özelliklerinin Araşti{dotless}ri{dotless}lmasi{dotless}]

Almost all granite,gabbro and basalt quarries have been abandoned in the last ten years,especially in the eastern black sea region because of high operation costs and cheap hard rock entrance to turkey from the countries such as china and india. in the study,the saraftepe hard rock quarry in the trabzon city was selected as a pilot site for encouraging and developing the hard rock production in the region,and the formation condition and geological properties of the operated tephrites in the quarry were investigated. thickness of the operating tephrite varies between 25 and 30 meters and it crops out along 750 meters. this tephrite sill intruded in the n70e/25nw directed limestone,marl,sandstone and tuff layers. geomechanical properties of the tephrite samples were investigated and some laboratory tests were conducted on the rock samples obtained from different zones because there is an anisotropic structure from top to bottom in the sill. the result of the conducted tests on the rock samples obtained from the different zones show that their uniaxial compressive strength values are between 87 and 130 mpa,p-wave velocities are between 5048 and 5642 m/s,density values are between 2.58 and 2.68 g/cm3,apparent porosity values are between 2.77 and 4.54% and water absorption by weight are between 1.04 and 1.78%. the weight lost at the end of the freezing-thawing test and wetting-drying tests are 0.36 and 0.22%,respectively. these test results shows there is % 10 strength loss at the end of the tests. considering the all investigation results,the studied tephrite will contribute to the regional economy.