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Full-Text Articles in Physical Sciences and Mathematics
An Approach To Paleoclimatic Conditions For Devonian (Upper Lochkovian And Middle Givetian) Ironstone Formation, Nw Anatolian Carbonate Platform, İsmai̇l Ömer Yilmaz, Mehmet Cemal Göncüoğlu, Di̇lek Gülnur Demi̇ray, İbrahi̇m Gedi̇k
An Approach To Paleoclimatic Conditions For Devonian (Upper Lochkovian And Middle Givetian) Ironstone Formation, Nw Anatolian Carbonate Platform, İsmai̇l Ömer Yilmaz, Mehmet Cemal Göncüoğlu, Di̇lek Gülnur Demi̇ray, İbrahi̇m Gedi̇k
Turkish Journal of Earth Sciences
Lower-middle Devonian iron-bearing successions were studied along 2 measured stratigraphic sections in the Çamdağ region of NW Anatolia. Ironstones in the upper part of the Fındıklı Formation in Kabalakdere are characterized by alternating red and green mudstones and sandstones at the bottom, followed by a series of dolomite, dolomitic limestone with oolitic ironstones, and chamositic mudstones at the top. Conodonts from these carbonates indicate the delta-pesavis zones of the late Lochkovian. The 12- to 45-m-thick Ferizli Formation unconformably overlies the Fındıklı Formation with a quartz-arenite succession at the bottom. The formation comprises alternating red, iron-rich limestones and dolomitic limestones, where …
Clay Mineralogy, Chemistry, And Diagenesis Of Late Devonian K-Bentonite Occurrences In Northwestern Turkey, Asuman Günal Türkmenoğlu, Ömer Bozkaya, Mehmet Cemal Göncüoğlu, Özge Ünlüce, İsmai̇l Ömer Yilmaz, Cengi̇z Okuyucu
Clay Mineralogy, Chemistry, And Diagenesis Of Late Devonian K-Bentonite Occurrences In Northwestern Turkey, Asuman Günal Türkmenoğlu, Ömer Bozkaya, Mehmet Cemal Göncüoğlu, Özge Ünlüce, İsmai̇l Ömer Yilmaz, Cengi̇z Okuyucu
Turkish Journal of Earth Sciences
Thin beds of tephra (K-bentonites) formed by the diagenesis of volcanic ash are exposed within the limestone-dolomitic limestone successions of the Yılanlı formation at Zonguldak and Bartın in northwestern Turkey. They were deposited on the Middle Devonian-Lower Carboniferous shallow carbonate platform of the Zonguldak terrane. In this study, K-bentonite samples collected from Gavurpınarı and Yılanlı Burnu limestone quarries are investigated in order to reveal their mineralogical and geochemical characteristics and diagenetic evolution. Illite is the major clay mineral in the studied K-bentonites. Additionally, kaolinite and mixed-layer illite-smectite are identified in some samples. The nonclay minerals calcite, dolomite, quartz, gypsum, feldspar, …