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First Report Of A Trilobite In The Carboniferous Of Eastern Pontides, Ne Turkey, Rai̇f Kandemi̇r, Rudy Lerosey-Aubril
First Report Of A Trilobite In The Carboniferous Of Eastern Pontides, Ne Turkey, Rai̇f Kandemi̇r, Rudy Lerosey-Aubril
Turkish Journal of Earth Sciences
The pre-Mesozoic basement of the Eastern Pontides consists of a Permo-Carboniferous sedimentary sequence including the Çatalçeşme and Hardişi formations. The Çatalçeşme Formation has yielded rich assemblages of fusulinids, corals, gastropods, brachiopods, bryozoans, algae, conodonts and plants. Hitherto trilobites were unknown from this formation; here we report the discovery of a pygidium from a dark grey limestone bed near the top. Trilobites are a minor component of benthic marine communities during the Late Pennsylvanian, and to our knowledge, the discovery of this pygidium constitutes the first report of their occurrence in deposits of this age in Turkey. The morphological characteristics of …
Sphalerite Associated With Pyrrhotite-Chalcopyrite Ore Occurring In The Kotana Fe-Skarn Deposit (Giresun, Ne Turkey): Exsolution Or Replacement, Emi̇n Çi̇ftçi̇
Sphalerite Associated With Pyrrhotite-Chalcopyrite Ore Occurring In The Kotana Fe-Skarn Deposit (Giresun, Ne Turkey): Exsolution Or Replacement, Emi̇n Çi̇ftçi̇
Turkish Journal of Earth Sciences
The Kotana prospect is located about 30 km south of Giresun (NE Turkey). The ore mineralization is a Fe-skarn occurring within the low-grade pre-Lower Jurassic Pınarlar metamorphics, consisting of marble-phyllite intruded by the Upper Cretaceous-Eocene Aksu biotite monzogranite. The principal primary ore minerals include pyrrhotite and magnetite along with minor pyrite (I) and chalcopyrite, accompanied by trace sphalerite. Sphalerite is closely associated with chalcopyrite and to a lesser extent with hexagonal pyrrhotite. Secondary ore minerals include pyrite (II), marcasite, martite, hematite, goethite, lepidocrocite, and intermediate Fe-oxides-hydroxides. Gangue minerals are mainly calcite and quartz. Oxidation of the primary sulphides resulted in …