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Architecture of coarse-grained gravity flow deposits in a structurally confined submarine canyon (late Eocene Tokaren Conglomerate, Slovakia)
Sedimentary Geology ( IF 2.8 ) Pub Date : 2021-02-25 , DOI: 10.1016/j.sedgeo.2021.105880
Juraj Janocko , Giorgio Basilici

This study documents the coarse-grained fill of an upper slope, late Eocene Tokaren Canyon in the Carpathian Mountains, whose planform geometry and internal architecture were driven by normal faulting of an underlying carbonate platform. Facies analysis hints at a narrow shelf and a direct link to rivers draining a rapidly-uplifting hinterland. The axial part of the canyon consists of several meters thick, amalgamated conglomerate intervals deposited by debris flows and, to a lesser extent, by debris falls, slides and high-density turbidity currents. The sediments form sheets consisting of several tens to several hundreds of meters wide lobes occasionally entrenched by small erosional chutes. The deposits on the higher, fault-bounded blocks closer to the channel margins, include well-developed conglomerate–sandstone packages. They show a sheet-like geometry scattered with small channels. The textural immaturity of the sediment, grain-size caliber, the sediment thickness variation in the canyon, the sedimentary facies and their spatial distribution imply a dominant role of tectonics and sediment supply in the evolution of the canyon.

Despite numerous studies of canyons in tectonically active settings, there are surprisingly limited studies on the depositional fill architectures of such canyons based on outcrop analogs. The detailed study of the Tokaren Canyon architecture brings a valuable insight into processes and distribution of proximal canyon fill facies controlled by syn-depositional faulting. It describes the architecture of such coarse-grained depositional system fed directly by rivers and governed by tectonics and supplements the knowledge from such systems obtained by different methodologies.



中文翻译:

结构受限的海底峡谷中的粗粒重力流沉积物的结构(斯洛伐克始新世Tokaren Conglomerate)

这项研究记录了喀尔巴阡山的始新世晚期特卡伦峡谷上坡的粗粒填充,其平面几何形状和内部构造是由下伏的碳酸盐台地的正常断裂驱动的。岩相分析暗示着狭窄的陆架,并且与流向迅速崛起的腹地的河流直接相连。峡谷的轴向部分由几米厚的,由泥石流沉积的,混合的砾岩层组成,在较小程度上,由碎石流,滑坡和高密度浑浊流沉积。沉积物形成由几十到几百米宽的裂片组成的薄片,偶而被小的侵蚀性滑槽所根深蒂固。靠近通道边界的较高断层带上的沉积物包括发育良好的砾岩-砂岩组合。它们显示出散布着小通道的片状几何形状。沉积物的质地不成熟,口径的大小,峡谷中沉积物厚度的变化,沉积相及其空间分布暗示着构造学和沉积物供应在峡谷演化中的主导作用。

尽管在构造活跃的环境中对峡谷进行了许多研究,但基于露头类似物对此类峡谷的沉积物充填结构进行的研究却出乎意料地有限。对Tokaren峡谷结构的详细研究为由同沉积断层控制的近峡谷填充相的过程和分布提供了宝贵的见识。它描述了这种由河流直接供给并受构造控制的粗粒沉积系统的体系结构,并补充了通过不同方法获得的此类系统的知识。

更新日期:2021-03-09
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