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首页> 外文期刊>Arabian Journal for Science and Engineering >Beachrock Cementation Patterns Along the Gulf of Aqaba Coast, Saudi Arabia
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Beachrock Cementation Patterns Along the Gulf of Aqaba Coast, Saudi Arabia

机译：沙特阿拉伯亚喀巴海岸沿岸的Beachrock胶结模式

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Beachrocks crop out along the Saudi coast of the Gulf of Aqaba with beds lying at elevations up to 0.8 m above the present sea level and with seaward extents that repeatedly submerge and emerge during high and low water levels. This study discusses the cement composition, petrography and bedding features of beachrocks at 24 different locations, of which a total of eight sites were sampled. The study focuses on the petrographic and microtextural characteristics of the beachrocks to elucidate their cementation environment and diagenetic evolution. The results revealed the predominance of three main cement types: (1) fibrous aragonite cement with morphologies including isopachous rims around grains with or without micritic substrates, pore-filling radial aggregates, pseudospherulite and randomly oriented interlocking aragonite fibers; (2) microcrystalline low-Mg calcite (LMC) cement binding grains and filling inter-and intra-granular pore spaces; and (3) micritic cement in the form of envelopes and/or pore-filling micrite in some samples with meniscus bridges. The last two types also contain infiltrated silt-sized clasts and skeletal remains. The cements indicate precipitation mainly in pore-filled marine phreatic diagenetic zone and, rarely, in the marine vadose zone with the aid of microbial and algal activity. Petrographic investigations and energy-dispersive X-ray spectroscopy of selected samples showed the occurrences of aragonite and LMC.
机译：沙滩岩沿亚喀巴湾的沙特海岸播种，其床层高出目前的海平面达0.8 m，在高低水位反复向海扩散并向海延伸。这项研究讨论了在24个不同地点的滩涂的水泥成分，岩石学和层理特征，总共采样了8个地点。该研究的重点是滩涂的岩石学和微观结构特征，以阐明其胶结环境和成岩作用演化。结果揭示了三种主要的水泥类型：（1）纤维状文石水泥，其形态包括：具有或不具有微晶基质的晶粒周围的等渗轮缘；成孔的放射状骨料；假球晶；和随机取向的联锁文石纤维； （2）微晶低镁方解石（LMC）水泥结合颗粒，填充粒间和粒内孔隙空间； （3）在一些带有弯月桥的样品中，以包膜和/或充填微孔形式的微晶水泥。最后两种类型还包含浸润的粉粒大小的碎屑和骨骼遗骸。水泥表明，降水主要在充满孔隙的海洋潜水成岩带，而在微生物和藻类活动的帮助下，很少在海洋渗流带。所选样品的岩相学研究和能量色散X射线光谱显示了文石和LMC的出现。

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