| Co-Investigator(Kenkyū-buntansha) |
KORAL Hayrettin Istanbul University, Associate Prof., 土木地質学部, 助教授
BARGU Simav Istanbul University, Associate Prof., 土木地質学部, 助教授
TANSEL Izver Istanbul University, Professor, 土木地質学部, 教授
MERIC Engin Istanbul University, Professor, 土木地質学部, 教授
ARAKAWA Yoji Saitama University, Associate Prof., 教育学部, 助教授 (00192469)
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| Research Abstract |
In the Black Sea Region, 13 sections for carbonate platform (Pontides Platform) were selected to provide a more detailed foraminiferal biostratigraphy, and strontium isotope and trace elements (geomarkers) analysis for the purpose of this study. This is to give the shallow benthic fauna, its extinction and survival on the Cretaceous and Tertiary Boundary (KT Boundary), Pontides Platform, and the shallow shelf environment. In Devrekani section, where the fossils of algae, bryozonans, foraminifers, rudists and corals of the Upper Cretaceous (Maastrichtian) and Danian-Thanetian age occur in the thickness of 32 m. The most frequent marker foraminifers are Siderolites calcitrapoides, Hellenocyclina beotica, Orbitoides medius, O.apiculatus, Ompalocyclus macroporus, Cideina soererii, Simplorbites gensacicus, Smoutina cruysi, Navarella joaguini, and Daviesina sp. These forms increases towards the KT Boundary. According to rock textures, limestone and marl vary from packstone to biomicrite of w
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ackestone, after the basal sandstone. The KT Boundary showed the beds between samples 806 and 807. In the following strata, the most frequents are bryozoan and echinoids, then small benthic foraminifers of Rotaliidae, Miliolidae, Texturariidae, and well known Planorbulina cretae and Laffiteina. By texture, it is biomicrite with an increased amount of organic matter. In Cide section, the Upper Cretaceous and Paleocene beds are about 145m thick, and are examined along the road with samples 901 and 939. The KT Boundary showed the beds between samples 929 and 930. The Maastrichtian pelagic foraminifers below the KT Boundary belong to Gansserina gansseri-Abathomphalus mayaroensis Zones.
Extinction of biota is accompanied by peak of strontium isotope value in Devrekani section, and by peak of concentration of elements as Cr, Co, Ni, and Zn, except Cu, in Golpazai, respectively. The sedimentation took place in the shallow shelf environment in lagoon to shallow marine (restricted shelf), where it did not essentially changed after the KT Boundary. Less
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