Diagenetic signatures in the deltaic and fluvial-estuarine Messinian sandstone reservoirs in the Nile Delta as a tool for high-resolution stratigraphic correlations

IF 3.5 2区 环境科学与生态学 Q2 ENVIRONMENTAL SCIENCES
Mahmoud Leila , Andrea Moscariello , Dustin Sweet , Branimir Šegvić
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引用次数: 2

Abstract

The current study utilizes a range of diagenetic fingerprints to differentiate between sandstone facies deposited in the Nile Delta before and during the Messinian salinity crisis (MSC), which is normally a challenging task considering the complex bio- and lithostratigraphic subdivisions of Messinian rock units. Subaerial exposure of the pre-MSC (Qawasim deltaic sandstone), during drawdown of the Mediterranean Sea at the time of the MSC, triggered pervasive dissolution of unstable rock fragments, kaolinization of feldspar, and meteoric dolomitization of carbonate. This was followed by mesogenetic calcite cementation and kaolinite transformation into dickite in deeply buried Qawasim sandstone. Comparatively, the Abu Madi estuarine facies, deposited during transgression after drawdown related to the MSC, is characterized by eogenetic iron (Fe)-calcite, glauconite, and pyrite (averages of 14.5%, 6%, and 2%, respectively). This facies transition is marked by abundance of mature glauconite (with potassium oxide (K2O) at about 8%) whose content abates upward from the transgression surface. Moreover, the compositional variability of the Abu Madi sandstone gave rise to multiple diagenetic trajectories that resulted in chlorite formation presumably following smectite and kaolinite. Listed diagenetic variations in the studied Messinian sandstone resulted from a complex interplay between rocks’ compositional, depositional, and burial attributes, ultimately serving as a basis for high-resolution stratigraphic correlation in continental and marginal marine settings with poor biostratigraphic controls.

尼罗河三角洲三角洲和河流河口Messinian砂岩储层的成岩特征作为高分辨率地层对比的工具
目前的研究利用一系列成岩指纹来区分在墨西尼亚盐度危机(MSC)之前和期间沉积在尼罗河三角洲的砂岩相,考虑到墨西尼亚岩石单元复杂的生物和岩石地层细分,这通常是一项具有挑战性的任务。地中海下沉期间,前MSC (Qawasim三角洲砂岩)的陆上暴露引发了不稳定岩石碎片的普遍溶解,长石的高岭石化和碳酸盐的大气白云化。在深埋的Qawasim砂岩中,中成因方解石胶结作用和高岭石转化为直辉石。相比之下,Abu Madi河口相沉积于海侵期间,沉积于与MSC相关的缩合期,其特征为生发铁(Fe)方解石、海绿石和黄铁矿(平均含量分别为14.5%、6%和2%)。该相转变以成熟海绿石丰富(含钾氧化钾约8%)为标志,其含量从海侵表面向上递减。此外,Abu Madi砂岩的成分变异性产生了多种成岩轨迹,可能导致绿泥石在蒙脱石和高岭石之后形成。所研究的墨西尼亚砂岩中列出的成岩变化是岩石成分、沉积和埋藏属性之间复杂的相互作用的结果,最终为在生物地层控制较差的大陆和边缘海相环境中进行高分辨率地层对比提供了基础。
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来源期刊
International Journal of Sediment Research
International Journal of Sediment Research 环境科学-环境科学
CiteScore
6.90
自引率
5.60%
发文量
88
审稿时长
74 days
期刊介绍: International Journal of Sediment Research, the Official Journal of The International Research and Training Center on Erosion and Sedimentation and The World Association for Sedimentation and Erosion Research, publishes scientific and technical papers on all aspects of erosion and sedimentation interpreted in its widest sense. The subject matter is to include not only the mechanics of sediment transport and fluvial processes, but also what is related to geography, geomorphology, soil erosion, watershed management, sedimentology, environmental and ecological impacts of sedimentation, social and economical effects of sedimentation and its assessment, etc. Special attention is paid to engineering problems related to sedimentation and erosion.
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