{"title":"Pre-Existing Structures and Stress Evolution Controlling a Pull-Apart Basin in the Tunisian Atlas Domain (Siliana Area): Geodynamic Implication","authors":"N. Mahmoudi, R. Azizi","doi":"10.1134/s0016852124700249","DOIUrl":null,"url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>In this paper we use a multidisciplinary approach including field observations, geological mapping and stress analysis to investigate the structural evolution of the NE-trending Sfina Basin, which located in the foreland basin of the Alpine chain (Maghrebides) in Tunisia. The Sfina Basin structure is the Neogene pull-apart basin, forming along the NE-trending Zaghouan fault, it located in Tunisian Atlas domain and formed in a NE‒SW-trending dextral strike-slip fault systems. Our result has shown that this NE-trending basin is limited in both northern and southern edges by two NE-trending dextral fault segments. During the Late Cretaceous‒Middle Miocene, under NE‒SW extensional regime, the NE-trending transtensional fault segments constituted the boundaries of the Sfina Basin that developed as a dextral releasing stepover. During the Late Miocene‒Early Quaternary, Sfina Basin was inverted under a regional NW‒SE-to-NNW‒SSE compressional event in response to the Africa‒Eurasia convergence with continental collision process. The inversion occurred mainly along Sfina Basin sidewalls by reactivation of the pre-existing NE‒SW-trending weaknesses as right-lateral transpressional shears and led to formation of the NE‒SW-trending major folds structures in the Sfina area.</p>","PeriodicalId":55097,"journal":{"name":"Geotectonics","volume":"171 1","pages":""},"PeriodicalIF":1.0000,"publicationDate":"2024-07-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Geotectonics","FirstCategoryId":"89","ListUrlMain":"https://doi.org/10.1134/s0016852124700249","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"GEOCHEMISTRY & GEOPHYSICS","Score":null,"Total":0}
引用次数: 0
Abstract
In this paper we use a multidisciplinary approach including field observations, geological mapping and stress analysis to investigate the structural evolution of the NE-trending Sfina Basin, which located in the foreland basin of the Alpine chain (Maghrebides) in Tunisia. The Sfina Basin structure is the Neogene pull-apart basin, forming along the NE-trending Zaghouan fault, it located in Tunisian Atlas domain and formed in a NE‒SW-trending dextral strike-slip fault systems. Our result has shown that this NE-trending basin is limited in both northern and southern edges by two NE-trending dextral fault segments. During the Late Cretaceous‒Middle Miocene, under NE‒SW extensional regime, the NE-trending transtensional fault segments constituted the boundaries of the Sfina Basin that developed as a dextral releasing stepover. During the Late Miocene‒Early Quaternary, Sfina Basin was inverted under a regional NW‒SE-to-NNW‒SSE compressional event in response to the Africa‒Eurasia convergence with continental collision process. The inversion occurred mainly along Sfina Basin sidewalls by reactivation of the pre-existing NE‒SW-trending weaknesses as right-lateral transpressional shears and led to formation of the NE‒SW-trending major folds structures in the Sfina area.
摘要 本文采用野外观测、地质测绘和应力分析等多学科方法，对位于突尼斯阿尔卑斯山脉（马格里布山脉）前缘盆地的东北向斯菲娜盆地的构造演化进行了研究。斯菲娜盆地的构造是新近纪的拉裂盆地，沿 NE 走向的扎古安断层形成，位于突尼斯阿特拉斯域，在 NE-SW 走向的右旋走向滑动断层系统中形成。我们的研究结果表明，这一 NE 走向盆地的南北边缘受到两个 NE 走向右旋断层段的限制。在晚白垩世-中新世中期，在 NE-SW 延伸机制下，NE 走向的横断断层段构成了 Sfina 盆地的边界，该盆地发展为右旋释放阶地。在中新世晚期-第四纪早期，斯菲娜盆地在非洲-欧亚大陆辐合与大陆碰撞过程的作用下，发生了区域性的西北-东南向-西北-东南向的压缩性倒转。这种倒转主要发生在斯菲娜盆地侧壁，是由于原先存在的东北-西南走向的薄弱环节被重新激活，形成了右侧转压剪切，并导致斯菲娜地区形成了东北-西南走向的主要褶皱结构。
期刊介绍：
Geotectonics publishes articles on general and regional tectonics, structural geology, geodynamics, and experimental tectonics and considers the relation of tectonics to the deep structure of the earth, magmatism, metamorphism, and mineral resources.
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