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The central-western Getic Carbonate Platform: Upper Jurassic to Lower Cretaceous biostratigraphy and sedimentary evolution of the Cioclovina–Băniţa sector (Southern Carpathians, Romania)
Facies ( IF 1.8 ) Pub Date : 2019-05-18 , DOI: 10.1007/s10347-019-0574-3
George Pleş , Alin Oprişa , Ioan I. Bucur , Emanoil Săsăran , Cristian V. Mircescu , Gelu Oltean , Răzvan G. Iacob

Detailed sedimentological and micropaleontological investigations have been carried out on nine sections from the central-western part of the Southern Carpathians (Cioclovina-Băniţa sector) that provide new insights into the Upper Jurassic–Lower Cretaceous biostratigraphy and sedimentary successions of the Getic Carbonate Platform. Based on the microfossil 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.

中文翻译:

中西部 Getic 碳酸盐岩台地:上侏罗纪到下白垩纪的生物地层和 Cioclovina – Băniţa 部门的沉积演化(南喀尔巴阡山脉,罗马尼亚)

对南喀尔巴阡山脉中西部(Cioclovina-Băniţa 部分)的九个剖面进行了详细的沉积学和微古生物学调查,为了解上侏罗纪 - 下白垩统生物地层学和 Getic 碳酸盐台地沉积序列提供了新的见解。根据微化石组合,可识别出三个生物地层区间:上基默里吉阶 - 下提通阶,上贝里亚阶 - 下瓦兰吉阶和上巴雷米阶 - 下阿普梯阶,第三个仅在上白垩纪(森诺曼阶)角砾岩/砾岩层序的元素中被识别。根据不同的结构/构造特征、生物碎屑和沉积古环境,已经确定了八个主要的微相。上侏罗统的微相组合主要描述台地边缘域(前礁、小型生物构造、生物碎屑砂)和部分台地内周缘碳酸盐岩和泻湖沉积物。最底层的白垩纪主要微相类型反映了台地内部(泻湖和池塘)浅水沉积环境中的潮汐作用。碳酸盐岩系列的沉积演化始于上侏罗统中上层和浅水碳酸盐岩,最后一个也是白垩纪最下层。上白垩统角砾岩/砾岩中下白垩统(巴雷米亚-阿普梯阶)石灰岩元素的存在表明,在该地层间隔期间,研究区域的几个部分可能存在台缘沉积。最后但并非最不重要的,
更新日期:2019-05-18
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