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首页> 外文期刊>Facies >Mid-Miocene (Badenian) transgression on Mesozoic basement rocks in the Mt. Medvednica area of northern Croatia
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Mid-Miocene (Badenian) transgression on Mesozoic basement rocks in the Mt. Medvednica area of northern Croatia

机译：中山中生代（巴甸）海侵。克罗地亚北部的梅德韦德尼察区

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摘要

Rocky shorelines in the geological record, which represent major transgressive surfaces and provide us with crucial information about paleoshorelines and ancient sea levels, often involve a basal conglomerate associated with an unconformity. The unconformity between the Mesozoic basement and the overlying Middle Miocene (Badenian) deposits (which belong paleo-geographically to the southwestern margins of the Central Paratethys, and geotectonically to the Pannonian Basin System) in the Gornje Oresje section (northeast Mt. Medvednica, northern Croatia) is marked by basal Badenian conglomerates. The Upper Cretaceous limestone lithoclasts occurring in basal conglomerates show abundant truncated Gastrochaenolites and Entobia borings (represented by an in situ rocky substrate community of bivalves and sponges, respectively), with Gastrochaenolites being the dominant ichnogenus. Gastrochaenolites-Entobia ichnofossil assemblage related to the Entobia subichnofacies and in turn assignable to the Trypanites Ichnofacies, is very typical of Neogene rocky shores. This association characterizes littoral rockground environments, indicating wave-cut platforms and marine flooding surfaces (transgressive surfaces) with a low or null rate of sedimentation. Erosion of a pre-existing Mesozoic basement rocky shore during a marine transgressive phase in these high-energy littoral conditions, which formed basal conglomerates analyzed here, is also evidenced by truncation and the occurrence of Gastrochaenolites borings on all sides of limestone clasts. Calcareous red algae encrusting bored lithoclasts and often-forming rhodoliths also imply that the basal conglomerates occur at the start of a deepening-upwards succession of a transgressive systems tract deposits. The biostratigraphic correlation of the transgressive deepening-upward sequence from the Gornje Oresje section (ascribed to a single Badenian transgressive event that affected the Mesozoic basement) is based on the presence of the orbulinas in the uppermost outer shelf marl interval. The co-occurrence of Praeorbulina glomerosa circularis and Orbulina suturalis points to the short interval between FO (first occurrence) of Orbulina suturalis and LO (last occurrence) of Praeorbulina glomerosa circularis. These samples belong to the plankton zone M6 (Orbulina suturalis Zone) or the base of NN5 zone, marking the third-order sequence TB 2.4, which represents the second, main Badenian transgression in the Central Paratethys.
机译：地质记录中的岩石海岸线代表主要的海侵面，为我们提供有关古海岸线和古代海平面的重要信息，通常涉及与不整合有关的基底砾岩。 Gornje Oresje断面（东北北部Medvednica，北部北部Medvednica）中生代基底与上覆的中新世（巴登纪）沉积物（古地理上属于中Paratethys西南边缘，并在大地构造上属于Pannonian盆地系统）之间不整合。克罗地亚）的标志是基底的巴登尼亚大企业集团。发生在基底砾岩中的上白垩统石灰石碎屑岩显示出大量的截断的天麻生物和Entobia钻孔（分别由原地岩石的双壳类和海绵体代表），而天麻生物是主要的鱼鳞石。新生代多岩石的海岸非常典型地具有与恩托比亚次生相有关的胃肠变质岩-恩托比亚次生化石组合。这种关联关系表征了沿海岩石地的环境，表明了低沉积率或零沉积率的波切平台和海洋洪水表面（海侵表面）。在这些高能沿海条件下，在海侵阶段，已经存在的中生代基底岩岸受到侵蚀，形成了基础砾岩，在这里进行了分析，这也被截断并在石灰岩碎屑的所有侧面上都发生了天文陨石钻孔。钙质红藻包裹着无聊的破骨细胞和经常形成的菱纹石，也暗示了基底砾岩发生在海侵系统道沉积物的深部向上演替开始时。 Gornje Oresje断层的海侵加深向上序列的生物地层学相关性（归因于影响中生代基底的单个Badenian海侵事件）是基于最上层外陆灰岩层段中的球团存在。圆球藻和subulalis的并发表明圆球藻的FO（首次出现）和圆球藻的LO（最后出现）之间的间隔较短。这些样本属于浮游生物M6区（Orbulina suturalis区）或NN5区的底部，标记了三阶序列TB 2.4，它代表了中Paratethys中的第二次主要的巴登尼亚海侵。

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