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

作　　者：Mahmoud Leila Andrea Moscariello Dustin Sweet Branimir Segvic 

机构地区：[1]Geology Department,Faculty of Science,Mansoura University,Mansoura,Egypt [2]Department of Earth Sciences,University of Geneva,Geneva,Switzerland [3]Department of Geosciences,Texas Tech University,Lubbock,TX,USA

出　　处：《International Journal of Sediment Research》2023年第5期754-768,共15页国际泥沙研究（英文版）

摘　　要：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 Medi-terranean Sea at the time of the MSC,triggered pervasive dissolution of unstable rock fragments,kao-linization of feldspar,and meteoric dolomitization of carbonate.This was followed by mesogenetic calcite cementation and kaolinite transformation into dickite in deeply buried Qawasim sandstone.Compara-tively,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(K 2 O)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 corre-lation in continental and marginal marine settings with poor biostratigraphic controls.

关 键 词：MESSINIAN Nile Delta DIAGENESIS Deltaic sedimentation Fluvial-estuarine Stratigraphic correlation 

分 类 号：P618.13[天文地球—矿床学]