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首页> 外文期刊>Geodinamica Acta >The Oued Dayr Formation: first evidence of a new Miocene late-orogenic cycle on the Ghomaride complex (Internal Domains of the Rifian Maghrebian Chain, Morocco)
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The Oued Dayr Formation: first evidence of a new Miocene late-orogenic cycle on the Ghomaride complex (Internal Domains of the Rifian Maghrebian Chain, Morocco)

机译：瓦德代尔组：第一个新的中新世晚期造山循环的证据在Ghomaride复合体上（摩洛哥Rifian Maghrebian链的内部区域）

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摘要

This work deals with the first evidence in the Rifian Maghrebids of a Miocene elastic succession, named Oued Dayr Fm, uncorformably resting on the Ghomaride Complex. The formation starts with polymictic conglomerates, consisting of clasts coming from all the Rifian Internal Units, sharply or gradationally evolving to graded and stratified calcareous sandstones, siltstones and massive marls. The occurrence of nannofossils starting from the NN5 Biozone of Martini indicates an age no older than middle Langhian. However, considering the possible reworking of taxa and the regional framework, the possibility of a younger age cannot be excluded. The sedimentary evolution points out a subsidence rate exceeding the detritic supply, within a thrust-top basin originated during an extensional tectonic phase, affecting the exhumed internal nappe stack. The Oued Dayr Fm constitutes the first evidence of a new Miocene late-orogenie sedimentary cycle resting on the Rifian Internal Units, intermediate between the Burdigalian Oued Gharraq-Sidi Abdeslam cycle and the Pliocene deposits. In a regional framework, no middle Miocene unconformable deposits are known on the Internal Units of both the Betic Cordillera and Maghrebian Chain, while Tortonian deposits everywhere occur. A Tortonian age, therefore, can be suggested for the Oued Dayr Fm, but data demonstrating this hypothesis at present are lacking.
机译：这项工作处理的是中新世弹性演替的里夫马格雷比德斯中的第一个证据，命名为Oued Dayr Fm，不合时宜地搁在Ghomaride Complex上。地层始于多聚砾岩，由来自所有日变内部单元的碎屑组成，从陡峭或渐进地演化成分级和分层的钙质砂岩，粉砂岩和块状泥灰岩。从马提尼的NN5生物区开始的纳米化石的出现表明年龄不比中兰吉安年龄大。但是，考虑到分类单元可能的改造和区域框架，不能排除年龄较小的可能性。沉积演化表明，在伸展构造阶段形成的逆冲顶盆内，沉降速率超过了有害物的供应，影响了发掘出的内部推覆层。 Oued Dayr Fm构成了新的中新世晚造山沉积周期的第一个证据，该沉积周期位于Rifian内部单元上，介于Burdigalian Oued Gharraq-Sidi Abdeslam周期和上新世沉积之间。在区域框架内，在双叠纪山脉和马格里比安链的内部单元中都没有发现中新世不整合的中等沉积物，而到处都有Tortonian沉积物。因此，可以为Oued Dayr Fm建议使用Tortoian年龄，但目前尚缺乏证明这一假设的数据。

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