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首页> 外文期刊>Geosciences >Superposed Sedimentary and Tectonic Block-In-Matrix Fabrics in a Subducted Serpentinite Mélange (High-Pressure Zermatt Saas Ophiolite, Western Alps)
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Superposed Sedimentary and Tectonic Block-In-Matrix Fabrics in a Subducted Serpentinite Mélange (High-Pressure Zermatt Saas Ophiolite, Western Alps)

机译：俯冲蛇纹岩混杂岩中的沉积和构造块状基质叠合构造（高压采尔马特·萨斯蛇绿岩，西阿尔卑斯山）

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The primary stratigraphic fabric of a chaotic rock unit in the Zermatt Saas ophiolite of the Western Alps was reworked by a polyphase Alpine tectonic deformation. Multiscalar structural criteria demonstrate that this unit was deformed by two ductile subduction-related phases followed by brittle-ductile then brittle deformation. Deformation partitioning operated at various scales, leaving relatively unstrained rock domains preserving internal texture, organization, and composition. During subduction, ductile deformation involved stretching, boudinage, and simultaneous folding of the primary stratigraphic succession. This deformation is particularly well-documented in alternating layers showing contrasting deformation style, such as carbonate-rich rocks and turbiditic serpentinite metasandstones. During collision and exhumation, deformation enhanced the boudinaged horizons and blocks, giving rise to spherical to lozenge-shaped blocks embedded in a carbonate-rich matrix. Structural criteria allow the recognition of two main domains within the chaotic rock unit, one attributable to original broken formations reflecting turbiditic sedimentation, the other ascribable to an original sedimentary mélange. The envisaged geodynamic setting for the formation of the protoliths is the Jurassic Ligurian-Piedmont ocean basin floored by mostly serpentinized peridotites, intensely tectonized by extensional faults that triggered mass transport processes and turbiditic sedimentation.
机译：西阿尔卑斯山采尔马特·萨斯蛇绿岩中一个混沌岩石单元的主要地层构造通过多相高山构造变形进行了改造。多标量结构标准表明，该单元在两个与延性俯冲有关的相变后发生了脆性-延性然后是脆性变形。变形分区以各种比例进行，从而保留了相对宽松的岩石区域，以保留内部纹理，组织和组成。在俯冲过程中，延性变形包括伸展，缝合和同时折叠主要地层演替。这种变形在交替的层中得到了很好的记录，这些层表现出鲜明的变形风格，例如富含碳酸盐的岩石和浊浊的蛇纹石变质砂岩。在碰撞和掘尸过程中，变形增强了密布的地貌和块体，从而形成了嵌入到富含碳酸盐的基质中的球形至菱形块体。结构标准允许识别混沌岩石单元内的两个主要区域，一个主要归因于反映湍流沉积的原始破碎地层，另一个归因于原始的沉积混杂岩。预计形成原生岩的地球动力学环境是侏罗纪的利古里亚-皮埃蒙特海盆，其底部大部分为蛇纹化橄榄岩，并由伸展断层强烈构造，引发了大规模的运输过程和湍流沉积。

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