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Sharp-based shoreface sandstones in the Early Carboniferous sediments of the Awaynat Wanin area (western Libya)
Journal of African Earth Sciences ( IF 2.2 ) Pub Date : 2021-03-05 , DOI: 10.1016/j.jafrearsci.2021.104168
Laurent Petitpierre , Sebastian Frohlich , Stephane Bodin , Paul V. Grech , Simon Lang , Dina Vachtman , Jonathan Redfern

The Awaynat Wanin exposure is the closest outcrop analogue for Palaeozoic strata deposited in the subsurface of the Ghadames basin. This study focuses on Lower Carboniferous strata, examined on the edge of the extensive Al Hammadah al Hamra plateau. The desert and rocky conditions of the area provide excellent exposures that are poorly documented. Our new dataset comprises 1500 m of sedimentary logs acquired along an 80 km transect. The results are present as a revised composite section for this exposure, which using integrated GPS and satellite data, re-assesses the maximum thickness of the Marar at 800 m. The excellent exposures also allow evaluation of lateral variability. Detailed facies analysis supports a dominantly marine environment of deposition, characterised by 45 sedimentary cycles that typically record transition from offshore mudstone to sandy shoreface facies and sometimes palaeosols. In the regional context of an inactive tectonic setting at deposition time in the Early Carboniferous, these numerous upward shallowing cycles are interpreted to record relative fluctuations of eustatic sea level. The Awaynat Wanin exposures therefore offers a valuable record to improve understanding of the Early Carboniferous variations of the sea level.



中文翻译:

Awaynat Wanin地区(利比亚西部)早期石炭纪沉积物中的尖锐基岩面砂岩

Awaynat Wanin暴露是沉积在Ghadames盆地地下的古生界地层最接近的露头类似物。这项研究的重点是在广泛的Al Hammadah al Hamra高原边缘检查的下石炭纪地层。该地区的沙漠和岩石条件提供了极好的曝光,但文献记载不足。我们的新数据集包括沿80 km断面采集的1500 m沉积测井。结果显示为该曝光的修订复合部分,使用集成GPS和卫星数据,重新评估Marar在800 m处的最大厚度。出色的曝光度还可以评估横向变化性。详细的相分析支持了主要的海洋沉积环境,其特征在于45个沉积循环,通常记录了从近海泥岩到砂质海岸相的转变,有时还记录了古土壤的转变。在早期石炭纪沉积时间不活跃的构造环境的区域性背景下,解释了这些无数次向上的浅变周期,以记录海平面上升的相对波动。因此,Awaynat Wanin暴露提供了宝贵的记录,可增进人们对早期石炭纪海平面变化的了解。

更新日期:2021-03-17
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