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首页> 外文期刊>Turkish journal of earth sciences >Givetian/Frasnian (Middle/Upper Devonian) transition in the eastern Taurides, Turkey
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Givetian/Frasnian (Middle/Upper Devonian) transition in the eastern Taurides, Turkey

机译：土耳其东塔里德斯的纪维天/弗拉尼斯（中泥盆世/上泥盆世）过渡

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Devonian strata, including siliciclastic and carbonate rocks that were deposited in shallow marine to coastal environments, arewidely distributed in the eastern Taurides of southern Turkey. To document the regional formation of the Givetian (Middle Devonian)/Frasnian (Upper Devonian) boundary, a section in the eastern Taurides was studied in high resolution with regard to biostratigraphy,microfacies, sequence stratigraphy, and the global Frasne Event. The integrated biostratigraphic investigation was based on calcareousbenthic foraminifers, ostracods, conodonts, and palynomorphs, which provide a biostratigraphic frame that allows to recognize theGivetian/Frasnian boundary. On the basis of the lithological variation in the outcrop as well as on depositional textures and bioticcomponents as observed in thin sections, fourteen microfacies types of both siliciclastic and carbonate rocks can be distinguished. Thesemicrofacies are interpreted to have been deposited in settings that range from distal shelf to lagoonal depositional environments. Thesequence stratigraphic interpretation allows to recognize two successive depositional sequences. The first one is a complete sequenceincluding lowstand systems tract deposits, overlain by transgressive systems tract and highstand systems tract deposits. The secondsequence is only represented by transgressive systems tract sediments. The Givetian/Frasnian boundary corresponds to the highstandsystems tract of Sequence 1. The late Givetian Frasne Event can be detected lithologically and can be compared with other areas. Itsposition is confirmed biostratigraphically.
机译：泥盆纪地层，包括沉积在浅海到沿海环境的硅质碎屑岩和碳酸盐岩，广泛分布在土耳其南部的陶里德东部。为了记录纪天地（中泥盆纪）/弗拉什尼（上泥盆纪）边界的区域形成，在高分辨率生物，地层学，微相，层序地层和全球Frasne事件方面研究了Taurides东部的一段。综合的生物地层学调查是基于钙质的底栖有孔虫，成骨纲，牙形石和古怪形态的，它们提供了一个生物地层学框架，可以识别吉维特/弗拉西尼亚边界。根据在薄片中观察到的露头岩性变化以及沉积质地和生物成分，可以区分硅质碎屑岩和碳酸盐岩的十四种微相类型。这些微相被解释为沉积在从远侧陆架到泻湖沉积环境的范围内。层序地层解释可以识别两个连续的沉积层序。第一个是完整的序列，包括低水位系统道沉积物，海侵系统道和高水位系统道沉积物覆盖。秒序列仅由海侵系统道沉积物代表。 Givetian / Frasnian边界对应于序列1的高位系统区域。晚期的Givetian Frasne事件可以通过岩性检测，并可以与其他地区进行比较。其位置已通过生物地层学证实。

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