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The Jurassic–Cretaceous transition in deep- and shallow-water carbonate depositional settings: a case study from the easternmost Getic Carbonate Platform (Southern Carpathians, Romania)
Facies ( IF 1.8 ) Pub Date : 2022-03-09 , DOI: 10.1007/s10347-022-00643-6
Cristian Victor Mircescu , Ioan I. Bucur , George Pleș

The Postăvaru Massif is located in the easternmost part of the Getic Carbonate Platform from the Southern Carpathians. The described sections are unevenly distributed in all four tectonic compartments of the Postăvaru Massif (Brașov, Cristian, Râșnov and Postăvaru). Eighteen sections were studied to highlight the biostratigraphic and facies evolution of the Upper Jurassic–Lower Cretaceous (Kimmeridgian–upper Berriasian) transition. Ten facies associations (FA 1–10) were described and they indicate a general shallowing upward tendency, from slope to platform-margin and inner-platform depositional settings. In other cases, the vertical facies stacking patterns indicate a general deepening-upward tendency, at the Upper Jurassic–Lower Cretaceous transition. The micropaleontological assemblage consists of encrusting organisms, dasycladalean algae, foraminifera and pelagic microfossils (calpionellids). As a general rule, this assemblage characterizes four main intervals and stages: Kimmeridgian–upper Tithonian, lower Berriasian, upper Tithonian–Berriasian and upper Berriasian. The carbonate succession from the Postăvaru Massif shares similar characteristics with other parts of the Getic Carbonate Platform (Cioclovina-Bănița area, Buila-Vânturarița Massif, Piatra Craiului-Dâmbovicioara Zone, Western part of Bucegi Massif). Finally, the presence of Lower Cretaceous (Berriasian) deposits is well documented by interpreting various assemblages of microfossils. This study combines microfacies and biostratigraphic analysis techniques to decipher the interplay between environmental conditions, facies distribution and biostratigraphic evolution at the Upper Jurassic–Lower Cretaceous transition, in the easternmost GCP. The Tithonian–Berriasian transition is marked by a continuity of sedimentation, in shallow and deep water depositional environments.



中文翻译:

深水和浅水碳酸盐沉积环境中的侏罗纪-白垩纪过渡:来自最东端的 Getic 碳酸盐台地(罗马尼亚喀尔巴阡山脉南部)的案例研究

Postăvaru 地块位于南喀尔巴阡山脉的 Getic 碳酸盐台地的最东端。所描述的剖面在波斯特瓦鲁地块的所有四个构造隔间(布拉索夫、克里斯蒂安、拉什诺夫和波斯特瓦鲁)分布不均。研究了 18 个剖面以突出上侏罗统 - 下白垩统(Kimmeridgian - 上 Berriasian)过渡的生物地层和相演化。描述了十个相组合(FA 1-10),它们表明从斜坡到台地边缘和台内沉积环境的普遍变浅向上趋势。在其他情况下,垂直相堆积模式表明在上侏罗统 - 下白垩统过渡处普遍加深 - 向上趋势。微古生物组合由结壳生物、dasycladalean 藻类、有孔虫和中上层微化石(calpionellids)。作为一般规则,该组合具有四个主要层段和阶段的特征:Kimmeridgian-上Tithonian、下Berriasian、上Tithonian-Berriasian和上Berriasian。Postăvaru 地块的碳酸盐岩层序与 Getic 碳酸盐台地的其他部分(Cioclovina-Bănița 地区、Buila-Vânturarița 地块、Piatra Craiului-Dâmbovicioara 带、Bucegi 地块西部)具有相似的特征。最后,通过解释各种微化石组合,可以很好地证明下白垩统(贝里亚期)沉积物的存在。本研究结合微相和生物地层分析技术,破译上侏罗统-下白垩统过渡时期环境条件、相分布和生物地层演化之间的相互作用,在最东端的 GCP。Tithonian-Berriasian 过渡的特点是在浅水和深水沉积环境中沉积的连续性。

更新日期:2022-03-09
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