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首页> 外文期刊>Oceanographic Literature Review >Paleogeographic, paleoclimatic and sea-level implications of glauconite deposits in Egypt: A review
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Paleogeographic, paleoclimatic and sea-level implications of glauconite deposits in Egypt: A review

机译：埃及青光玉米岩矿床古地理，古叶植物和海平面影响：综述

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摘要

Glauconite deposits are confined to the Western Desert in Egypt of four different sequences and ages from older to younger include, 1) Lower Cenomanian Bahariya Formation, 2) Lower-Middle Campanian Qusseir Formation, 3) Upper Campanian Duwi Formation, and 4) Lutetian-Bartonian Hamra Formation. Lower Cenomanian, Upper Campanian and Lutetian-Bartonian glauconites occur as pellets, while the Lower-Middle Campanian glauconite occurs as fine-grained particles of non-pelletal texture. Based on K_2O contents, the Lower Cenomanian and Upper Campanian glauconites are classified as slightly evolved, while the Lower-Middle Campanian and Lutetian-Bartonian glauconite are categorized as evolved. Positive correlations between K_2O and Fe_2O_3 in the Bahariya Formation, Qusseir Formation and Hamra Formation deposits suggest a layer lattice glauconitiza-tion mechanism for these deposits. On the other hand, the lack of correlation between Fe_2O_3 and K_2O declines the layer lattice formational mechanism for the Duwi Formation glauconite. A neo-formation mechanism was suggested for this glauconite. Rare earth elements patterns are the same in the four deposits and resemble the shallow sweater pattern. The four glauconite deposits formed in shallow marine environments and might correspond to major eustatic transgressive and global warming events. Glauconite of the Bahariya Formation corresponds to the Early Cenomanian Tethys major transgression in Egypt and can be correlated to the Albian/Cenomanian global cycle boundary as well as the early Cenomanian "hot greenhouse". The sequence boundary near the topmost part of the Qusseir Formation matches the global warming of the Middle Campanian Event (MCE). The upper Campanian glauconite of the Duwi Formation occurs as lowstand wedge and may correlate to the late Campanian climatic warm optimum. The stratigraphic position of the Hamra glauconite above the unconformity surface refers to transgressive phase that may match with latest Lutetian major sequence boundary (Lu4) and global warming event of the Middle Eocene Climatic Optimum (MECO). Paleogeographic maps show that the Western Desert of Egypt during Cenomanian and Lower Campanian covered by shallow marine setting, which match with the proposed setting for the glauconites in these ages. However, paleogeographic maps for the Upper Campanian and Middle Eocene were modified to fit with the suggested setting of glauconites of these epochs. The prevalence of shallow marine setting during these four ages interprets the restricted occurrences of glauconites at the Western Desert of Egypt during these epochs.
机译：青光康钛矿矿床被局限于埃及的西部沙漠，较年轻的序列和年龄较大，1）较低的Cenomanaian Bahariya Chormation，2）中下的Campanian QUSSeir形成，3）上部Campanian Duwi形成，4）Lutetian- Bartonian Hamra形成。降低Cenomanian，上坎帕尼亚和卢特蒂安 - Bartonian的甘油糖苷作为颗粒，而下部坎皮南氏葡萄糖酸盐作为非颗粒质地的细粒颗粒。基于K_2O内容，较低的Cenomanian和上部Campanian Glauconites被归类为略微发展，而下部坎帕尼亚和卢特蒂安 - Bartonian Glauconite被分类为进化。 K_2O和FE_2O_3之间的正相关性在Bahariya形成，QUSSeir形成和哈姆拉形成沉积中表明了这些沉积物的层晶格胶质组织机构。另一方面，Fe_2O_3和K_2O之间的相关性缺乏相关性的杜威形成葡糖岩层格形成机制。该胶水酸盐的提出了一种新形成机制。稀土元素图案在四个沉积物中是相同的，并且类似于浅毛衣图案。在浅海洋环境中形成的四个青光罐头沉积物，可能对应于主要的南部泛滥和全球变暖事件。 Bahariya的Glauconite对应于埃及的早期Cenomanian Thethys重大犯罪，并且可以与Albian / Cenomanian全球循环边界以及早期的Cenomanian“Hot Femehahe”相关。 QUSSeir形成最顶部附近的序列边界与中间Campanian Event（MCE）的全球变暖相匹配。 Duwi形成的上坎帕尼亚葡萄糖岩作为折叠楔子，可能与晚坎帕尼亚气候温暖最佳最佳相连。 Hamra Glauconite之上的非整合表面上方的地层位置是指与最新的Lutetian主要序列边界（LU4）和中间何中气候最佳（MECO）的全球变暖事件相匹配的近近迁移阶段。古地理地图显示埃及西部沙漠在临曼尼亚和较低的坎帕尼亚覆盖的浅海洋环境中，与这些年龄段中的胶石岩的建议设置相匹配。然而，修改了上南美洲和中间虫族的古地理图，以适应这些时期的浮石的建议设置。这四年期间浅海洋环境的普遍率解释了这些时期埃及西部沙漠的受限制发生的雷琥珀酸盐。

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  • 来源
    《Oceanographic Literature Review》 |2020年第9期|1939-1939|共1页
  • 作者

    H. Baioumy; S. Farouk; K. Al- Kahtany;

  • 作者单位

    Egyptian Petroleum Research Institute 1 Ahmed El- Zomor Street Nasr City Cairo Egypt;

    Egyptian Petroleum Research Institute 1 Ahmed El- Zomor Street Nasr City Cairo Egypt;

    Egyptian Petroleum Research Institute 1 Ahmed El- Zomor Street Nasr City Cairo Egypt;

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