Geohistorical study of Foraminifera biostratigraphy and ecological change of Cretaceous-Tertiary transitional formations in the Black Sea Region, Republic of Turkey

在黑海地区，选择了13个碳酸盐台地（Pontides台地）剖面，为本研究提供更详细的有孔虫生物地层学、锶同位素和微量元素（地质标志物）分析。这是为了给浅底栖动物，它的灭绝和生存的白垩纪和第三纪边界（KT边界），庞蒂兹平台，和浅海陆棚环境。在Devrekani剖面中，在32 m厚处出现了上白垩统（Maastrichtian）和Danian-Thanetian时代的藻类、苔藓虫、有孔虫、rudists和珊瑚化石。最常见的标志性有孔虫是Sideralcitrapoides、Hellenocyclina beotica、Orbitoides medius、O.apiculatus、Ompalocyclus macroporus、Cideina soereri、Simplorbites gensacicus、Smoutina cruysi、Navarella joaguini和Daviesina sp.。根据岩石结构，石灰岩和泥灰岩从厚灰岩到w 关于我们 砂岩，位于基底砂岩之后。KT边界显示样品806和807之间的床。其次是苔藓虫和棘虫，其次是小底栖有孔虫，包括轮虫科、粟粒虫科、织纹虫科，以及著名的Planorbulina cretae和Lancosteina。从结构上看，它是有机质含量增加的生物微晶灰岩。锡德段上白垩统和古新统地层厚约145 m，沿沿着取样901和939进行检查。KT边界显示了样品929和930之间的层。KT界线以下的Maastrichtian浮游有孔虫属Gansserinagansseri-Abathomphalusmayaroensis带，生物群的灭绝分别伴随着Devrekani剖面的锶同位素值峰值和Golpazai剖面的Cr、Co、Ni、Zn等元素（Cu除外）的浓度峰值。沉积作用发生在泻湖-浅海（限制陆棚）的浅海陆棚环境中，在KT边界之后没有发生本质的变化。少

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 … More 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