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首页> 外文期刊>Arabian Journal for Science and Engineering >Fades Analysis and Depositional Environments of Ash Shumaysi Formation (Oligocene-Miocene), Makkah Quadrangle, Wadi Ash Shumaysi, West Central Arabian Shield, Saudi Arabia
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Fades Analysis and Depositional Environments of Ash Shumaysi Formation (Oligocene-Miocene), Makkah Quadrangle, Wadi Ash Shumaysi, West Central Arabian Shield, Saudi Arabia

机译：瓦迪Ash Shumaysi，中西部阿拉伯盾，沙特阿拉伯，麦加四边形，Ash Shumaysi组（渐新世-中新世）淡化分析和沉积环境

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摘要

Ash Shumaysi Formation represents Oligo-Miocene fiuvio-lacustrine succession consisting mainly of conglomerates, sandstones, siltstones, muddy, sandy and glauconitic ironstones, fresh water carbonates, tuffaceous mudstone and basalts in descending order. It shows the transition from proximal to distal parts of the depositional environments of braided streams into floodplain and finally into lacustrine facies. This succession comprises four main facies associations arranged according to their predominance from the lower to the upper parts of the succession of Ash Shumaysi Formation as follows: (1) proximal (conglomerates facies association I) braided streams which includes four facies of sandstones and conglomerates (Fl, F2, F3 and F4), (2) distal (sandstones facies association II) braided streams which comprises three facies (F5, F6 and F7), (3) meandering streams (facies association III) which include the thinly bedded muddy, glauconitic and sandy ironstones-ferruginous sandstone facies (F8), (4) lacustrine delta (facies association IV) which includes three facies (F9, 10 and 11). The Oligo-Miocene siliciclastic sections of Ash Shumaysi represent deposition in mid to distal parts of alluvial fans formed as a result of interplay between climatic conditions, tectonic and sedimentation. In the extreme distal parts of these alluvial fans, river lakes were filled rapidly with conglomerates, sandstones, mudstones and finally fresh water carbonated were formed during arid periods of low siliciclastic input.
机译：Ash Shumaysi地层代表低新中新世的紫色湖相陆相演替，主要由砾岩，砂岩，粉砂岩，泥状，砂状和青冈铁岩，淡水碳酸盐岩，凝灰质泥岩和玄武岩组成。它显示了辫状河沉积环境从近端到远端的过渡到洪泛区，最后进入湖相。该相继包括四个主要相相，按照其在灰舒马斯组的下部到上部的优势排列，顺序如下：（1）近端（砾岩相I）辫状流，其中包括四个砂岩和砾岩相（ F1，F2，F3和F4），（2）由三个相（F5，F6和F7）组成的远侧（砂岩相组合II）辫状流，（3）包括薄层状泥质的曲折流（相组合III），钙质和砂质铁岩-铁质砂岩相（F8），（4）湖三角洲（相协会IV），其中包括三个相（F9、10和11）。 Ash Shumaysi的中新世硅质碎屑岩断层代表了冲积扇中部至远端的沉积，这是气候条件，构造和沉积之间相互作用的结果。在这些冲积扇的最远端，河水湖泊迅速充满了砾岩，砂岩，泥岩，最后在低硅质碎屑输入的干旱时期形成了碳酸水。

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