Carbon mobility and exchange in a plate-interface subduction mélange: A case study of meta-ophiolitic rocks in Champorcher Valley, Italian Alps

Scambelluri, Marco; Cannaò, Enrico; Guerini, Sara; Bebout, Gray E.; Epstein, Gabe S.; Rotondo, Francesca; Campomenosi, Nicola; Tartarotti, Paola

doi:10.1016/j.lithos.2022.106813

Cited by 4 publications

(1 citation statement)

References 81 publications

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“…Thus, the mantle section of ophiolites can be regarded as having formed the "leading edge of the mantle wedge" (Falk & Kelemen, 2015;Kelemen & Manning, 2015;Kelemen et al, 2013) for millions to tens of millions of years in many cases. Thus, these rocks may preserve a record of mass transfer from subducting material into the forearc mantle (e.g., Boskabadi et al, 2020;Deschamps et al, 2010;Förster et al, 2017;Li & Lee, 2006;Menzel et al, 2018;Nozaka, 2014;Peacock, 1987;Peng et al, 2020;Sachan et al, 2007;Scambelluri et al, 2016Scambelluri et al, , 2022Schwarzenbach et al, 2018;Sideridis et al, 2022;Spandler et al, 2008;Ulrich et al, 2020;Wu et al, 2021;Zhao et al, 2021). supporting this approach are summarized in several papers (e.g., Falk & Kelemen, 2015;Kelemen et al, 2022;Menzel et al, 2022).…”

Section: Subduction Zone Mass Transfer At the Leading Edge Of The Man...mentioning

confidence: 99%

Preface: Special Issue on Ophiolites and Oceanic Lithosphere

et al. 2023

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With this Preface, we provide background information, a scientific overview of topics, and an annotated bibliography of the 63 papers published in the Journal of Geophysical Research (JGR) Special Issue on “Ophiolites and Oceanic Lithosphere, with a Focus on the Samail Ophiolite,” collected online at https://agupubs.onlinelibrary.wiley.com/doi/toc/10.1002/(ISSN)2169-9356.SAMAIL1. Topics covered in the Special Issue include formation and alteration of igneous ocean crust at submarine spreading centers, subduction zone mass transfer at the leading edge of the mantle wedge, the tectonic emplacement and evolution of ophiolites, processes of alteration and weathering of tectonically exhumed mantle peridotite, and the subsurface biosphere in the peridotite weathering environment. The bibliography, in the form of a supplementary Excel spreadsheet with links to each paper, is organized by topic, but can be sorted by first author, order of publication, specific Oman Drilling Project boreholes, and other factors.

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Section: Subduction Zone Mass Transfer At the Leading Edge Of The Man...mentioning

confidence: 99%

Preface: Special Issue on Ophiolites and Oceanic Lithosphere

et al. 2023

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C–O–H fluid-melt-rock interaction in graphitic granulites and problems of quantifying carbon budget in the lower continental crust

2023

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

Guerini,

Tartarotti

2024

JGS

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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

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Carbon mobility and exchange in a plate-interface subduction mélange: A case study of meta-ophiolitic rocks in Champorcher Valley, Italian Alps

Cited by 4 publications

References 81 publications

Preface: Special Issue on Ophiolites and Oceanic Lithosphere

Preface: Special Issue on Ophiolites and Oceanic Lithosphere

C–O–H fluid-melt-rock interaction in graphitic granulites and problems of quantifying carbon budget in the lower continental crust

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

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