How brittle detachments form and evolve through space and time

IF 4.8 1区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Earth and Planetary Science Letters Pub Date : 2024-11-07 DOI:10.1016/j.epsl.2024.119108

C. Zuccari , F. Mazzarini , E. Tavarnelli , G. Viola , L. Aldega , V. Moretto , R. Xie , G. Musumeci

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引用次数: 0

Abstract

We report the first absolute deformation ages for the Mykonos Detachment that juxtaposes, in the context of the current Aegean rifting, Miocene siliciclastic deposits in the hanging wall against metabasites and synkinematic granites in the footwall. We identified and characterised 16 brittle structural facies (BSFs) within the detachment fault architecture through fieldwork, optical microscopy, and X-ray diffraction. BSFs dating by K-Ar of synkinematic mixed layer illite-smectite shows that the preserved BSFs formed during repeated slip events, thus constraining protracted faulting between 13.5 and 6.5 Ma. Dating, structural and mineralogical characterisation allowed for the time-constrained evaluation of the activation/de-activation of the involved deformation mechanisms and of the processes, including (i) fault zone nucleation, (ii) deformation partitioning, (iii) cataclasis, gouge formation and (iv) the final deformation localisation, that govern the evolution of brittle detachments, shaping the local current upper crustal structure. Our results provide new insights into the understanding of wide active and fossil rift systems.

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脆性脱落是如何形成并在空间和时间中演变的

我们首次报告了米克诺斯支脉的绝对变形年龄，在当前爱琴海断裂的背景下，该支脉将悬壁的中新世硅质沉积物与底壁的偏闪长岩和同生花岗岩并列在一起。我们通过实地考察、光学显微镜和 X 射线衍射，确定并描述了剥离断层结构中的 16 个脆性结构面（BSF）。通过同步混合层伊利石-闪长岩的 K-Ar 测定，BSFs 的年代显示，保存下来的 BSFs 是在反复滑动过程中形成的，从而确定了 13.5 至 6.5 Ma 之间的漫长断层。通过年代测定、结构和矿物学特征描述，可以对所涉及的变形机制的激活/去激活过程以及包括(i) 断层区成核、(ii) 变形分区、(iii) 角砾岩、沟槽形成和(iv) 最终变形定位在内的各种过程进行有时间限制的评估，这些过程控制着脆性脱离的演化，塑造了当地当前的上地壳结构。我们的研究结果为了解广阔的活动断裂和化石断裂系统提供了新的视角。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Earth and Planetary Science Letters 地学-地球化学与地球物理

CiteScore

10.30

自引率

5.70%

发文量

475

审稿时长

2.8 months

期刊介绍： Earth and Planetary Science Letters (EPSL) is a leading journal for researchers across the entire Earth and planetary sciences community. It publishes concise, exciting, high-impact articles ("Letters") of broad interest. Its focus is on physical and chemical processes, the evolution and general properties of the Earth and planets - from their deep interiors to their atmospheres. EPSL also includes a Frontiers section, featuring invited high-profile synthesis articles by leading experts on timely topics to bring cutting-edge research to the wider community.