埃及东部沙漠北部上新世岩石演替的地貌层次和微观特征:推断特提斯地台的频繁次生暴露和相关古气候

IF 1.1 4区 地球科学 Q3 GEOLOGY Carbonates and Evaporites Pub Date : 2024-09-05 DOI:10.1007/s13146-024-01003-x
Hanan S. Badawy, Soheir H. El-Shazly, Dina M. Sayed, Ibrahim M. Abd El-Gaied, Yasser F. Salama
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引用次数: 0

摘要

在埃及东部沙漠北部贝尼-苏埃夫-扎法拉纳公路沿线的上新世贝尼-苏埃夫和马迪地层中,含有古溶胶和钙质岩的微观特征,这种向上堆积的浅滩模式的演变与频繁的次表层暴露有关。这项工作是通过使用偏光显微镜进行露头观察和微地层分析的综合方法完成的。研究揭示了 16 种微岩相类型,分为 6 个岩相组合,代表了砾岩-碳酸盐岩混合斜坡环境。斜坡面带包括后斜坡限制泥滩/上潮平面和泻湖、受保护和低能内斜坡、开放内斜坡、碳酸盐浅滩和开放中/外斜坡。这些循环通常以开放的内斜坡碳酸盐岩面开始,以泥滩碎屑岩面/淤泥暴露面结束。沉积环境的垂直变化表明,这些岩相是在一个构造高度活跃的地区沉积的,因此受到特提斯大断裂和回归的影响。次生出露的显微特征,包括微钠晶体聚集体、结晶体、根瘤、叠层石样结构、片状裂缝、栅栏、微生物垫层和生物碎屑溶解,通常出现在循环的最上部。研究区域记录的微构造特征为埃及南部特提斯地台在晚始新世的定期出现提供了有力证据。这些特征表明当时的古气候介于半干旱和半湿润之间。所研究单元中记录的次生断陷和相关成岩/成气特征,在埃及上新世碳酸盐岩中并没有广泛报道。
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Facies hierarchy and microscopic features of upper Eocene rock succession, northern Eastern Desert, Egypt: inference on frequent subaerial exposure of Tethys platform and relevant palaeoclimates

The evolution of the upward stacking pattern of shoaling, which contains microscopic features of paleosols and calcretes in the Upper Eocene Beni-Suef and Maadi Formations along the Beni-Suef-Zaafarana road in the northern Eastern Desert, Egypt, is related to frequent intervals of subaerial exposure. The work was achieved through an integrated approach of outcrop observations and microfacies analysis using polarizing microscopy. The study reveals the presence of sixteen microfacies types grouped into six facies associations, representing a mixed clastics-carbonates ramp setting. The ramp facies belts consist of a back ramp restricted mudflat/supratidal flat and lagoon, protected and low-energy inner ramp, open inner ramp, carbonate shoal, and open middle/outer ramp. The cycles commonly start with open inner ramp carbonate facies and end with mudflat clastic facies/subaerial exposure surfaces. The vertical changes in the depositional environments indicate that the facies were deposited within a highly tectonic active area that was consequently influenced by the transgression and regression of the Tethys. Microscopic features of subaerial exposure, including Microcodium crystal aggregates, crystallaria, rhizoliths, Stromatolite-like structures, sheet cracks, fenestrae, microbial mat laminae and dissolution of bioclasts, commonly occur in the topmost part of the cycles. The documented microfabric features in the study area provide strong evidence of the regular emergence of the southern Tethys platform in Egypt during the Late Eocene. They point to an intermediate palaeoclimate, involving conditions ranging from semi-arid to sub-humid. Subaerial disconformities and associated diagenesis/pedogenesis features, as recorded in the studied units, are not widely reported in the upper Eocene carbonates in Egypt.

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来源期刊
Carbonates and Evaporites
Carbonates and Evaporites 地学-地质学
CiteScore
2.80
自引率
14.30%
发文量
70
审稿时长
3 months
期刊介绍: Established in 1979, the international journal Carbonates and Evaporites provides a forum for the exchange of concepts, research and applications on all aspects of carbonate and evaporite geology. This includes the origin and stratigraphy of carbonate and evaporite rocks and issues unique to these rock types: weathering phenomena, notably karst; engineering and environmental issues; mining and minerals extraction; and caves and permeability. The journal publishes current information in the form of original peer-reviewed articles, invited papers, and reports from meetings, editorials, and book and software reviews. The target audience includes professional geologists, hydrogeologists, engineers, geochemists, and other researchers, libraries, and educational centers.
期刊最新文献
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