Petrographical and Geochemical Aspects of some Limestones from the Samalut Formation, North of El Minya, Nile Valley, Egypt

M.A. El- Hefnawi; Svetlana M. Loukina

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Petrographical and Geochemical Aspects of some Limestones from the Samalut Formation, North of El Minya, Nile Valley, Egypt

机译：埃及尼罗河谷艾尔米尼亚北部萨玛鲁特组一些石灰岩的岩石学和地球化学方面

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The petrographic investigations of the Samalut Formation north of El Minya town revealed four main limestone microfacies: grainstones, packstones, boundstones and, to a less extent, wackestones. Nummulites Gizehensis is the main rock-forming genera. Grainstones are more pronounced in the Samalut Formation exposed on the west of the Nile . On the other hand, packstones dominated in the localities of east bank of Nile. The authors attributed the studied Samalut limestone to reef deposits. The studied carbonates have been subjected to a variety of diagenetic alterations dominated by micritization, cementation, compaction, dissolution and neomorphism. Chemistry reveals some monotony in the distribution of major elements. Sodium and Sr have trend to escape during recrystallization in meteoric conditions. The other trace elements are rather impoverished as a result of low AIR- content and diagenetic alterations.

机译：在El Minya镇以北的Samalut地层的岩相学调查中发现了四个主要的石灰岩微相：颗粒岩，包裹岩，界石和少量的砂岩。 Gizehensis是Nummulites Gizehensis的主要成岩属。在尼罗河西部暴露出的Samalut组中，花岗岩更为明显。另一方面，泥石在尼罗河东岸地区占主导地位。作者将研究的萨玛鲁特石灰石归因于礁石沉积物。所研究的碳酸盐已经经历了各种成岩作用，主要是微晶化，胶结作用，压实作用，溶解作用和新晶作用。化学揭示出主要元素的分布有些单调。钠和锶在大气条件下的重结晶过程中有逃逸的趋势。由于空气含量低和成岩作用变化，其他微量元素相当贫瘠。

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《Bulletin of the National Research Centre》 |2005年第4期|p.349-374|共26页
作者
M.A. El- Hefnawi; Svetlana M. Loukina;
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National Research Centre, Dokki, Cairo, Egypt;

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正文语种 eng
中图分类自然科学总论;
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Petrographical and Geochemical Aspects of some Limestones from the Samalut Formation, North of El Minya, Nile Valley, Egypt

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