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首页> 外文期刊>Facies >The central-western Getic Carbonate Platform: Upper Jurassic to Lower Cretaceous biostratigraphy and sedimentary evolution of the Cioclovina-Bnia sector (Southern Carpathians, Romania)
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The central-western Getic Carbonate Platform: Upper Jurassic to Lower Cretaceous biostratigraphy and sedimentary evolution of the Cioclovina-Bnia sector (Southern Carpathians, Romania)

机译：中西部Getic碳酸盐平台：上侏罗腊士术对小白垩纪生物数据和沉积物进化的Cioclovina-Bnia行业（南喀尔巴阡山脉，罗马尼亚）

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摘要

Detailed sedimentological and micropaleontological investigations have been carried out on nine sections from the central-western part of the Southern Carpathians (Cioclovina-Bnia sector) that provide new insights into the Upper Jurassic-Lower Cretaceous biostratigraphy and sedimentary successions of the Getic Carbonate Platform. Based on themicrofossil assemblages, three biostratigraphic intervals are recognized: upper Kimmeridgian-lower Tithonian, upper Berriasian-lower Valanginian and upper Barremian-lower Aptian, the third being recognized only in elements of an Upper Cretaceous (Cenomanian) breccia/conglomerate sequence. Eight main microfacies have been identified based on different structural/textural traits, bioclasts, and sedimentary paleoenvironments. The microfacies associations of the Upper Jurassic succession mainly describe platform margin domains (fore-reef, small bioconstructions, bioclastic sands) and partly inner-platform peritidal carbonates and lagoonal deposits. The lowermost Cretaceous main microfacies types reflect tidal action in shallow-water sedimentary settings of the platform interior (lagoons and ponds). The sedimentary evolution of the carbonate succession commenced with Upper Jurassic pelagic and shallow-water carbonates, the last characterizing also the lowermost Cretaceous. The presence of Lower Cretaceous (Barremian-Aptian) limestone elements within the Upper Cretaceous breccia/conglomerates suggest that platform margin sedimentation might have existed during this stratigraphic interval in several parts of the studied region. Last, but not least, this study significantly contributes to knowledge of the Upper Jurassic-Lower Cretaceous microfossil assemblages from this part of the Getic Carbonate Platform.
机译：详细的沉积物学和微生物团论调查已经在南喀尔巴阡南部（Cioclovina-BNIA部门）中西部（Cioclovina-BNIA部门）的九个部分中进行了新的见解，该洞察力为Getic碳酸盐平台的上侏罗世 - 下白垩纪生物数据和沉积演替提供了新的见解。基于ThemicRofossil组合，识别出三个生物数据间隔：上部Kimmeridgian-Lower Tithonian，上部Berriasian-Lower valanginian和上层横梁下更低的Aptian，第三个仅在上白垩纪（Cenomanian）Breccia / Conglomerate序列的元素中识别。已经基于不同的结构/纹理性状，生物燃料和沉积古环境鉴定了八个主要的微缩放。上侏罗纪连续的微缩放关联主要描述平台边缘结构域（前礁，小生物结构，生物旋气砂），部分平台突出碳酸盐和泻湖沉积物。最下面的白垩纪主要微胶类类型反映了平台内部浅水沉积环境中的潮汐作用（Lagoons和Ponds）。碳酸盐继承的沉积演化开始于侏罗腊族骨质岩石和浅水碳酸盐，最后的表征也是最下白垩纪。上白垩纪（Barremian-Anvian）石灰质元素的存在表明，在研究区域的几个部分中，在该地层间隔期间可能存在平台边缘沉降。最后，但并非最不重要的是，这项研究显着地有助于了解来自Getic碳酸盐平台的这部分的侏罗纪 - 下白垩纪微生物组合。

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