Zusammenfassung
Karstphänomene und Kalkkrusten (Caliche) haben sich auf den Oberflächen der Gesteine des Mittelmiozäns im Gebiet zwischen Quseir und Mersa Alam entlang der Küste des Roten Meeres in Ägypten entwickelt. Eingehende Untersuchungen von Kalkkrusten Profilen lassen unterschiedliche Strukturen und Gefüge erkennen, die sowohl zyklische Bildung belegen als auch diagenetische Kristallisations-Differentiation und Deformation. Das Auftreten dieser Caliche-Bildungen legt nahe, daß die mittelmiozänen Gesteine im Untersuchungsgebiet abwechselnd regenreichen Perioden und solchen mit starker Evaporation ausgesetzt waren.
Abstract
Karstified features and surficial calcareous crust (caliche) develop on the upper most surfaces of the Middle Miocene rocks in the area between Quseir and Mersa Alam along the Red Sea coast, Egypt. Detailed studies of the caliche profile revealed various textures and fabrics denoting a cyclicity in deposition as well as diagenetic differentiation crystallization and deformation. The occurrence of these caliche deposits suggest that the Middle Miocene rocks in the study area have been subjected to alternating periods of rainfall and intense evaporation.
Résumé
Des structures karstiques et des croûtes calcaires superficielles (caliches), se sont formées à la surface des roches du Miocène moyen dans la région comprise entre Ouseir et Mersa Alam, le long de la côte de la mer Rouge, en Egypte. L'étude détaillée de profils de la caliche révèle des structures variées qui indiquent un dépôt cyclique ainsi qu'une cristallisation différentielle et une déformation diagénétique. La présence de tels dépôts de caliche suggère que les roches du Miocène moyen de cette région ont été soumises alternativement à des périodes de pluie et d'évaporation intense.
Краткое содержание
На поверхности пород среднего миоцена в районе между Quseir и Mersa Alam вдол ь берега Красного моря образо вались известковые к орки каличе — и карсты. На основани и исследования профилей этих извест ковых кор удалось уст ановить в них структуру и текс туру, которые указыва ют на то, что здесь имело м есто, как образование циклами, так и деформа ция и дифференциация при кристаллизации в результате диагенет ических процессов. Появление каличе говорит о том, что исследованна я область подвергала сь в среднем миоцене попе ременно воздействия м периода дождей и интенсивног о испарения.
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El Aref, M., Wahab, S.A. & Ahmed, S. Surficial calcareous crust of caliche type along the Red Sea coast, Egypt. Geol Rundsch 74, 155–163 (1985). https://doi.org/10.1007/BF01764577
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DOI: https://doi.org/10.1007/BF01764577