Coeval Miocene development of thrust belt-backarc and forearc extension during the subduction of a continental margin (Western-Central Mediterranean Sea)

IF 2.1 3区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS
Alfonsa Milia , Maurizio M. Torrente
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引用次数: 4

Abstract

The position of the middle-upper Miocene volcanic arc, encompassing the Maghrebides, the Sardinia Channel and the Sardinia-Corsica block, implies that the Algerian and Tyrrhenian basins developed, respectively, as backarc and forearc extensional zones in the Western-Central Mediterranean. The opening of the Western-Central Mediterranean Neogene extensional basin has been commonly interpreted as a two-step process: the opening of the Provençal-Algerian basin during the early-middle Miocene, followed, in the late Miocene, by the formation of the Tyrrhenian Basin. This article is an attempt to synthesize knowledge about the hinge zone between Algerian and Tyrrhenian basins by combining the analysis of seismic reflection profiles with dredge and borehole data in order to investigate how the transition between the eastern Algerian backarc and Tyrrhenian forearc geodynamic settings took place. We identified three sectors: the western Tyrrhenian characterized by a Tortonian forearc extension; the Sardinia Channel, which preserves the architecture of the lower Miocene Maghrebian thrust belt formed during the collision between Europe and Africa plates; and the easternmost Algerian basin-Sicily Channel where a backarc–thrust belt system developed during the Tortonian stage. During the extensional events, we hypothesize the re-activation of inherited structures during Tortonian rifting, (that is a negative tectonic inversion of pre-existing Eocene and early Miocene thrust faults). The contemporaneity of two different geodynamic environments, the forearc extension in the northern area and backarc–thrust belt system in the southern area, can be directly related with a lateral variation of the lower plate paleogeography of the Africa continental margin. This evidence contributes to the understanding of how the paleogeography of the lower plate can control, to a certain extent, the tectonic evolution of the upper plate in a subduction setting.

大陆边缘俯冲过程中逆冲带弧后和弧前伸展的新世-中新世(地中海中西部)
中新世中上部火山弧的位置,包括马格里布德、撒丁海峡和撒丁-科西嘉地块,表明阿尔及利亚盆地和第勒尼安盆地在地中海西部中部分别发育为弧后和弧前伸展带。西-中地中海新近系伸展盆地的打开通常被解释为一个两步过程:早中新世中期普罗旺 -阿尔及利亚盆地的打开,随后中新世晚期第勒尼安盆地的形成。本文试图通过对地震反射剖面的分析,结合挖泥和钻孔资料,综合有关阿尔及利亚和第勒尼安盆地之间铰链带的知识,以研究阿尔及利亚东部弧后和第勒尼安弧前地球动力学背景之间的过渡是如何发生的。我们确定了三个板块:以托尔顿前弧扩张为特征的西第勒尼安;撒丁岛海峡,保留了中新世马格里布冲断带的构造,形成于欧洲板块和非洲板块之间的碰撞;阿尔及利亚盆地-西西里海峡最东端发育托尔顿期弧后冲断带体系。在伸展事件中,我们假设托尔顿断裂期间继承构造的再激活(即对原有始新世和早中新世逆冲断层的负构造反转)。北部的弧前伸展和南部的弧后冲断带体系这两种不同的地球动力环境的同期性与非洲大陆边缘下板块古地理的横向变化有直接关系。这一证据有助于理解下板块古地理如何在一定程度上控制俯冲背景下上板块的构造演化。
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来源期刊
Journal of Geodynamics
Journal of Geodynamics 地学-地球化学与地球物理
CiteScore
4.60
自引率
0.00%
发文量
21
审稿时长
6-12 weeks
期刊介绍: The Journal of Geodynamics is an international and interdisciplinary forum for the publication of results and discussions of solid earth research in geodetic, geophysical, geological and geochemical geodynamics, with special emphasis on the large scale processes involved.
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