马格里布带东段(突尼斯北部)渐新世-早中新世盆地的构造重建:前弧曲俯冲的影响

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Geotectonics Pub Date : 2024-04-18 DOI:10.1134/s0016852124700055
R. Azizi, N. Mahmoudi, S. Gaieb, H. Mnasri, Y. Houla, Ch. Mezni
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摘要

摘要根据实地观察和构造沉积分析,我们建议通过对突尼斯北部的案例研究重建自始新世以来的地质演变。了解渐新世-早中新世沉积物的时空分布和变形情况有助于重建该地区的构造体系。在该研究地区,在重建渐新世-早中新世的演替过程中发现了两种共存但构造环境不同的沉积盆地类型。在突尼斯北部,晚始新世的缩短导致了薄层变形,产生了不规则的基底地形。在渐新世-早中新世的俯冲过程中,马格里布努米底亚飞沙的最早岩性沉积在深海近海环境中。与此同时,在突尼斯东北部(前中新世)发生断裂之后,Fortuna 的第二批岩性沉积在西北走向的伸展构造中。在中新世时期,非洲与中地中海微板块之间俯冲的弯曲前弧主导了突尼斯北部。因此,Numidian 盆地隆起,在突尼斯西北部形成了推力片,而支撑 Fortuna 演替的伸展构造则被封闭,并在沿 NW-SE 边界断层发生转位变形后形成了推升构造。自晚中新世以来,突尼斯北部发生了大陆碰撞,导致结构缩短,一些地区隆起,沉积间隙覆盖了研究区域的很大一部分。
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Structural Reconstruction of the Oligo–Early Miocene Basins of the Eastern Segment of Maghrebian Belt (Northern Tunisia): Influence of Subduction of the Fore-Arc Curvature

Abstract

Based on the field observations and tectono-sedimentary analysis, we suggest reconstruction of the geological evolution from case study of Northern Tunisia since the Eocene age. The reconstruction of the structural architecture of this region can be aided by knowing the spatiotemporal occurrence and the deformation of the Oligo‒Early Miocene deposits. In the research area, two depositional basin types that coexisted but in different tectonic settings were seen in the reconstruction of Oligo‒Early Miocene successions. In Northern Tunisia, the Late Eocene shortening episode led to a thin-skinned deformation that produced irregular basement topography. During the Oligo‒Early Miocene subduction process, the earliest lithofacies of the Maghrebian Numidian flysch deposited in deep marine offshore environment. Synchronously in the onshore, the second lithofacies of Fortuna were deposited in NW-trending extensional structures after a rifting episode that characterized north-eastern Tunisia (ante-nappes). During the Middle Miocene, the curving fore-arc of subduction between Africa and the Mesomediterranean Microplate dominated northern Tunisia. As a result, the Numidian basin was raised, resulting in thrust sheets in northwestern part of Tunisia, while the extensional structures supporting the Fortuna succession were closed and created push-up structures following transpressional deformation along the NW‒SE boundary faults. Continental collision has occurred in northern Tunisia since the Late Miocene, resulting in shortening structures, some elevated areas, and sedimentary gaps encompassing a substantial portion of the study area.

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来源期刊
Geotectonics
Geotectonics 地学-地球化学与地球物理
CiteScore
1.90
自引率
9.10%
发文量
28
审稿时长
3 months
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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