The effect of tectonic boudinage and folding in a subducted mélange of the Alpine orogenic belt (Zermatt–Saas Zone, Italian Western Alps)

Abstract

The Zermatt-Saas Zone is an eclogite-facies metaophiolite unit representing the fossil oceanic lithosphere of the Jurassic Tethys. In the Italian Northwestern Alps, the Zermatt-Saas Zone includes a chaotic rock unit, or mélange, ca. 40 m thick, interposed between serpentinites and calcschists. The mélange consists of decimetric ultramafic layers and boudins embedded in a serpentine + carbonate-rich matrix showing a block-in-matrix fabric. The mélange shares the same Alpine tectono-metamorphic evolution with the surrounding rocks, starting with a prograde path developed under high-pressure (HP) conditions followed by a retrograde path during exhumation. The kinematic and metamorphic relations between inside- and outside-boudin foliations attests that boudinage and shearing developed during the prograde HP path. Fluid-rock interaction enhanced shearing and focused ductile and brittle/ductile deformation along lithological contacts between rigid blocks and boudins and flowing carbonaceous matrix. Despite a pervasive orogenic evolution, the primary tectono-sedimentary features of the mélange are still recognizable in some outcrops and attributed to an intraoceanic (Jurassic) setting characterized by mass transport processes. The present-day fabric of the studied mélange unit thus results from the superposition of the Alpine processes, responsible for fluid-assisted stratal disruption and mixing in the subduction channel, on the original stratigraphy formed during intraoceanic gravitational processes. Supplementary material Figures S1 to S6 and Tables S1 and S2 are available at https://doi.org/10.6084/m9.figshare.c.6924080 Thematic collection: This article is part of the Ophiolites, melanges and blueschists collection available at: https://www.lyellcollection.org/topic/collections/ophiolites-melanges-and-blueschists