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Carbonate slope re‐sedimentation in a tectonically‐active setting (Western Sicily Cretaceous Escarpment, Italy)
Sedimentology ( IF 3.5 ) Pub Date : 2020-03-05 , DOI: 10.1111/sed.12705
Vincenzo Randazzo 1 , Johan Le Goff 2 , Pietro Di Stefano 1 , John Reijmer 2 , Simona Todaro 1 , Maria Simona Cacciatore 3
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Tectonic processes are widely considered as a mechanism causing carbonate platform margin instabilities leading to the emplacement of mass transport deposits and calciturbidites. However, only few examples establishing a clear link between tectonics and re-sedimentation processes are known from the literature. The two-dimensional and three-dimensional wire-cut walls of hundreds of quarries extracting ornamental limestones (for example, Perlato di Sicilia) from the Western Sicily Cretaceous Escarpment in Italy expose a series of mass transport deposits. The depositional architecture, spatial facies distribution and sedimentary features of these deposits were studied in detail. Thin section analysis was used to define the microfacies characteristics and to determine the age of the re-sedimented limestones. Eleven facies types grouped into four facies associations were recognized that defined specific depositional processes and environments. The stratigraphic architecture of the slope was reconstructed using four composite facies successions based on the detailed analysis and correlation of the field sections. The palaeoslope orientation was reconstructed based on the analysis of synsedimentary faults, slump scars and pinch-out geometries. The Western Sicily Cretaceous Escarpment was strongly influenced by synsedimentary transtensional tectonics in combination with magmatic processes, as suggested by the presence of tuffites and pillow lava intercalations within the re-sedimented carbonate series. These volcanics point to a major role of crustal shear as a trigger for mass transport deposit emplacement. The facies distribution along the Western Sicily Cretaceous Escarpment delivers new insights into the deformation processes accompanying the crustal extension of the Cretaceous western Tethys realm.

中文翻译:

构造活动环境中的碳酸盐斜坡再沉积(西西里岛白垩纪悬崖,意大利)

构造过程被广泛认为是导致碳酸盐台地边缘不稳定的机制,导致大量输送沉积物和方解石浊积岩的就位。然而,从文献中知道的在构造和再沉积过程之间建立明确联系的例子很少。数百个采石场的二维和三维线切割墙从意大利西西里白垩纪断崖中提取观赏性石灰石(例如 Perlato di Sicilia),暴露了一系列大规模运输沉积物。详细研究了这些矿床的沉积构造、空间相分布和沉积特征。薄片分析用于定义微相特征并确定再沉积石灰岩的年龄。识别出定义了特定沉积过程和环境的 11 种相类型,分为四种相组合。基于现场剖面的详细分析和相关性,使用四个复合相序列重建了斜坡的地层结构。基于对同沉积断层、塌陷疤痕和尖灭几何结构的分析,重建了古斜坡方向。西西里白垩纪西部悬崖受到同沉积张拉构造与岩浆过程相结合的强烈影响,正如在重新沉积的碳酸盐系列中存在凝灰岩和枕状熔岩夹层所暗示的那样。这些火山岩表明地壳剪切作为质量输送沉积物就位的触发器的主要作用。
更新日期:2020-03-05
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