Yazar "Tuncer G." seçeneğine göre listele

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    History of natural stones and industry of Turkey
    (2009) Tuncer G.; Kerey I.E.
    Anatolia was one of the centers of marble production and trade especially in antique ages.Quarries that provided the marble used in the majestic structures in huge proportions of the antique era were located mostly in Western Anatolia.Marmara Island is in the Northwest Anatolia, Marmara Sea took its name from "Marmaro", meaning marble in Greek; it contains the most important white marble quarries and was the most important export center especially during Roman period.Quarries where the bluish Marmara Marble was mined were expanded by Romans and turned into big enterprises.Marble was transported to Mediterranean and Black Sea as well, with Roman's Ships that could carry big blocks. Marble was not only exported as blocks from there,they were sold first as semi-processed (decorations would be made on arrival) pillars, sarcophagus and similar products, then fully pocessed in late antique age. Most of the white marble used in Istanbul in Byzantium and Ottoman periods were shipped from Marmara Island. © 2009 All Rights Reserved by the International Multidisciplinary Scientific GeoConference SGEM.
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    Prediction of ground vibrations induced by blasting at Cebeci Quarries in Istanbul-Turkey
    (2010) Kaya E.; Tuncer G.; Bicer S.
    During the production and service to the humanity of mine resources that are needed both by industry and construction of new grand buildings and plants that are the basic news of the modern world parallel to the urbanization and the increase in population, it is known that, like it has been in the past and will be in the future, works of excavation by blastings are inevitable. In order to designate the effects of the blastings on surrounding area, measurements of concussion and air shocks are very important. This paper presents investigation of the environmental effects of ground vibration induced by blasting in various quarries depend on Cebeci Quarries Production and Marketing Cooperative located at Northern Istanbul in Turkey. Within the scope of this study, scaled distance components have been recorded for all shots at these quarries at different times. And also, ground vibrations and air blasts produced by these shots have been recorded by means of different ground vibration monitors. Then, the data pairs of scaled distance and particle velocity obtained from all records were analysed statistically. At the end of statistical evaluation of the data pairs, an empirical relation which gives average line at upper bound 95% prediction line with a good correlation coefficient was established between peak particle velocity and scaled distance. As a result of the studies in these quarries in question, some practical approaches are created in order to minimize the psychological effects of the shots and make the authorities of shots job easier and make sure that the shots in the area will be done in a controlled way.
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    Stratigraphic features and geotectonic evolution of the south edge (narman-oltu-olur) of eastern Pontids (Northeast Turkey)
    (2008) Bozkus C.; Kerey I.E.; Tuncer G.
    The southern edge of Eastern Pontids is covered by rock units belonging to two distinct continental crusts that reunited through a Late Upper Cretaceous-Eocene suture zone. In the north of the Suture zone (Olur), Paleozoic aged acid magmatits (Permo- Carboniferous) constitute the continental crust basement. On this basement, there is uninterrupted marine sediment which has disconformably developed between Upper- Lias Late Cretaceous. These sediments have deposited under the conditions of Lias- Lower Malm basic volcanic intercalated and fragmented shallow marine, carbonate Upper Malm-Neocomien (Valanjinien), Hotrivien-Kampanien flysh and Meastrihtien shallow marine carbonate facieses. Thus, the deposition period that was dominated by pyroclastics as a result of Kampanien volcanic activity has come into being. At the lowest level of suture zone (Oltu), Santonien-Meastrihtien aged external blocked (olistolithe) tectono-sedimenter mixture take place in the typical flysh facieces. In the south of Suture zone (Narman), ophiolite units take place in the position of tectonic segments that are generally inclined to the north and belonging oceanic crust in the shape of ophiolite mixture. In the north of continental crust where arc volcanism is situated, the fact that the ophiolite rocks, in the south, outcrops of north-inclined tectonic segments and oceanic crust is a proof of a northwards subduction. The volcanic activity that is seen in the pyroclastic type in this field has first started in Kampanien and then in dasitic Turonien type in the relatively north. This displays the fact that the northwards subduction has developed at the beginning of Upper-Cretaceous. These three rock units belonging distinct tectonic environments are generally covered with angular disconformity that are constituted by units of volcanic and Eocene aged shallow marine-continental fragments. Thus, opening in Lias, with the developed oceanic northwards subduction, has been closed before Eocene. At the end of Eocene, in the completely non-marine suture zone and intermountain molas basins, which were limited between the mountain ranges that are stuck between the overlapping postorogenic ophiolite, Oligocene aged continental fragments have been developed. These units have been covered by Post and Upper Miocene and generally horizontal or almost horizontally situated volcanic and continental sediments. This zone has been under the influence of the tectonic controls of both the Lias-Lower Cretaceous and the beginning of Upper-Cretaceous to recent compression. A control of mutual Upper Cretaceous-Upper Miocene compression and thickening, and another compression control influenced by Upper Miocene to recent compression and thickening activity have been dominant, because curved and overlapping structures of pre-upper Miocene have been covered by almost horizontally situated Late Miocene aged rock units in disconfirmity. In this respect, the beginning of the neotectonic period in this zone has to be in the Upper Miocene.