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首页> 外文期刊>Journal of African Earth Sciences >A review of tectonic models for the rifted margin of Afar: Implications for continental break-up and passive margin formation
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A review of tectonic models for the rifted margin of Afar: Implications for continental break-up and passive margin formation

机译：阿法尔裂谷边缘的构造模型综述：对大陆破裂和被动边缘形成的影响

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摘要

The Afar region represents a unique opportunity for the study of ongoing rift development and the various phases of continental break-up. In this work we discuss the geological and geomorphological characteristics of the Western Afar Margin (WAM) and the various scenarios proposed for its evolution. A drastic decline in topography and crustal thickness from the Ethiopian Plateau into the Afar Depression, as well as a series of marginal grabens and a general presence of antithetic faulting characterize the WAM. Present-day extension is mostly accommodated at the rift axis in Afar, yet the margin is still undergoing significant deformation.Models for the evolution of the WAM involve either isostatic loading effects due to erosion, rifting-induced block rollover, large-scale detachment fault development or crustal flexure due to lithospheric stretching or magmatic loading. This wide variation of potential mechanisms for WAM development may reflect a general structural variation along the margin and in Afar, involving different stages of rift formation and possibly indicating two distinct pathways leading to continental break-up.In order to better understand the rifting mechanisms and to fully exploit the research potential of the region, further assessment of the WAM and its relation to Afar will be necessary. The findings of such future work, combined with data from rifts and passive margins from around the globe will be of great importance to assess the processes involved in continental breakup and to better constrain the sequence of events leading from initial rifting to break-up and oceanic spreading.
机译：阿法尔地区为研究裂谷持续发展和大陆分裂的各个阶段提供了独特的机会。在这项工作中，我们讨论了西远缘带（WAM）的地质和地貌特征以及为其演化提出的各种方案。从埃塞俄比亚高原到阿法尔凹陷，地貌和地壳厚度急剧下降，一系列边缘边缘地陷和对断层普遍存在，这是WAM的特征。现今的延伸大部分被容纳在阿法尔的裂谷轴上，但边缘仍在发生明显的变形.WAM的演化模型包括由于侵蚀引起的等静载荷效应，裂谷引起的块体翻滚，大规模的脱离断层。岩石圈伸展或岩浆载荷导致地壳发育或地壳弯曲。 WAM发展的潜在机制的这种广泛变化可能反映了边缘和远方的总体结构变化，涉及裂谷形成的不同阶段，并可能指示导致大陆破裂的两种不同途径。为了充分利用该地区的研究潜力，有必要对WAM及其与Afar的关系进行进一步评估。此类未来工作的发现，再结合来自裂谷和全球被动边缘的数据，对于评估与大陆分裂有关的过程，并更好地限制从初始裂谷到分裂和海洋性事件的发生顺序，将具有重要意义。传播。

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  • 来源
    《Journal of African Earth Sciences》 |2020年第4期|103649.1-103649.22|共22页
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  • 作者单位

    Univ Firenze Dipartimento Sci Terra Via G La Pira 4 I-50121 Florence Italy;

    CNR Ist Geosci & Georisorse Via G La Pira 4 I-50121 Florence Italy;

    Univ Firenze Dipartimento Sci Terra Via G La Pira 4 I-50121 Florence Italy|Univ Southampton Sch Ocean & Earth Sci Southampton SO14 3ZH Hants England;

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  • 正文语种 eng
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  • 关键词

    Rifting; Continental break-up; Passive margin; Tectonics; Lithospheric extension; Magmatic rifting;

    机译：裂痕大陆分手;被动余量;构造;岩石圈伸展;岩浆裂谷;

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