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Minerals
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Orogenic Metamorphism of Oceanic Lithosphere
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Orogenic Metamorphism of Oceanic Lithosphere

A special issue of Minerals (ISSN 2075-163X). This special issue belongs to the section "Mineral Deposits".

Deadline for manuscript submissions: closed (30 June 2020) | Viewed by 6479

Special Issue Editor

Prof. Dr. Gaggero Laura

E-Mail Website
Guest Editor
Department of Earth, Environment and Life Sciences, University of Genoa, I-16132 Genoa, Italy
Interests: subduction; obduction; oceanic stratigraphy; structural and stratigraphic heritage

Special Issue Information

Dear Colleagues,

The amalgamation of ophiolites into orogenic buildings represents the final stages of a Wilson cycle. However, different geodynamic models might have occurred in the closure of recent and ancient ocean floors.

Subduction-related alpine-type dynamics produced low T/P metamorphic series; the continental collision typical of the Carboniferous orogens that built the Pangea generated intermediate to high-grade nappes, possibly involving partial melting at different crustal levels; accretionary prisms are characterized by very-low-to medium-grade metamorphic overprint; the shallow stacking of young and hot oceanic lithosphere  produced high T/P metamorphic series, and mélange structures incorporated a wide stratigraphic record overprinted by low to high metamorphic grade.

This Special Issue will focus on discussions based on novel analytical methods or original modeling approaches to understanding the emplacement mechanisms of oceanic lithosphere from different geodynamic settings and orogens through time. Contributions are welcomed which report examples of ophiolitic successions from different primary settings (i.e., with different compositions and stratigraphic features), recording metamorphic gradients representative of different examples of the orogenic processes.

Prof. Dr. Gaggero Laura
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Minerals is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • oceanic lithosphere
  • structural and stratigraphic heritage
  • subduction
  • obduction
  • plate collision
  • orogenic metamorphism

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Published Papers (2 papers)

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Research

50 pages, 23729 KiB  
Article
Metamorphic Conditions of Neotethyan Meliatic Accretionary Wedge Estimated by Thermodynamic Modelling and Geothermobarometry (Inner Western Carpathians)
by Ondrej Nemec, Marián Putiš, Peter Bačík, Peter Ružička and Zoltán Németh
Minerals 2020, 10(12), 1094; https://doi.org/10.3390/min10121094 - 6 Dec 2020
Cited by 7 | Viewed by 2865
Abstract
Metamorphic evolution of an accretionary wedge can be constrained by a reconstructed P–T conditions of the oceanic and continental margin fragments. This paper deals with the metamorphic overprinting of the Inner Western Carpathians (IWC) Meliatic Triassic–Jurassic paleotectonic units after the closure of the [...] Read more.
Metamorphic evolution of an accretionary wedge can be constrained by a reconstructed P–T conditions of the oceanic and continental margin fragments. This paper deals with the metamorphic overprinting of the Inner Western Carpathians (IWC) Meliatic Triassic–Jurassic paleotectonic units after the closure of the Neotethyan Meliata Basin. Medium to high-pressure and lower temperature conditions were estimated by Perple_X pseudosection modelling, combined with garnet–phengite, calcite–dolomite and chlorite thermometers and chlorite–phengite and phengite barometers. The Late Jurassic subductional burial to a maximum 50 km depth was estimated from the Bôrka Unit continental margin fragments at 520 °C and 1.55 GPa. This is compatible with the metamorphic peak garnet–glaucophane–phengite assemblage of blueschist facies in metabasites. The Jaklovce Unit oceanic fragments were subducted to maximum 35–40 km at 390–420 °C and 1.1–1.3 GPa. Metabasalts and metadolerites contain winchite, riebeckite, actinolite, chlorite, albite, epidote and phengite. A glaucophane-bearing metabasalt recorded an intra-oceanic subduction in blueschist-facies conditions. Rare amphibolite-facies metabasalts of this unit indicate the base of an inferred oceanic crust sliver obducted onto the continental margin wedge. The Meliata Unit oceanic/continental margin flysch calciclastic and siliciclastic metasediments suggest the burial to approximately 15–20 km at 250–350 °C and 0.4–0.6 GPa. This is indicated by a newly formed albite, K-feldspar, illite–phengite and chlorite associated with quartz and/or calcite and dolomite in these rocks. Magnesio-hastingsite to magnesio-hornblende bearing metagabbro with newly formed metamorphic magnesio-riebeckite and actinolite is an inferred detached Meliatic block tectonically emplaced in a Permian salinar mélange in the Silica Nappe hanging wall. Reconstructed P–T paths indicate variable metamorphic conditions from the medium-pressure to high-pressure subduction of the Bôrka and Jaklovce units to the Meliata Unit shallow burial in an accretionary wedge during Late Jurassic to Early Cretaceous Meliaticum evolution. Mélange blocks of Meliaticum incorporate different juxtaposed Meliatic paleotectonic units exposed in nappe outliers overlying the IWC Gemeric and Veporic superunits. Full article
(This article belongs to the Special Issue Orogenic Metamorphism of Oceanic Lithosphere)
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39 pages, 35683 KiB  
Article
Tectono-Metamorphic Evolution of Serpentinites from Lanzo Valleys Subduction Complex (Piemonte—Sesia-Lanzo Zone Boundary, Western Italian Alps)
by Matteo Assanelli, Pietro Luoni, Gisella Rebay, Manuel Roda and Maria Iole Spalla
Minerals 2020, 10(11), 985; https://doi.org/10.3390/min10110985 - 5 Nov 2020
Cited by 5 | Viewed by 3266
Abstract
In the upper Tesso Valley the folded contact between Piemonte Zone ophiolites and Sesia-Lanzo Zone continental crust is exposed. Here serpentinites, metabasites, calcschists and fine-grained gneisses are deformed by four ductile superposed groups of structures, associated with different mineral assemblages. Different serpentinite lithologies [...] Read more.
In the upper Tesso Valley the folded contact between Piemonte Zone ophiolites and Sesia-Lanzo Zone continental crust is exposed. Here serpentinites, metabasites, calcschists and fine-grained gneisses are deformed by four ductile superposed groups of structures, associated with different mineral assemblages. Different serpentinite lithologies have been recognized and studied in detail. Mylonitic D2 structures are pervasive and mineral assemblages point to re-equilibration at T of 450 ± 50 ∘C and P of 0.8 ± 0.3 GPa, under blueschist/epidote amphibolite-facies conditions. Pre-D2 structures and mineral assemblages are relics within S2 and indicate a re-equilibration under eclogite-facies conditions, at T of 570 ± 50 ∘C and P > 1.8 GPa. Post-D2 occurs under greenschist-facies conditions. Numerical modeling of a subduction zone allows exploration of the geodynamic context in which such PT path could have developed, and to make hypotheses about the possible timing of such a scenario, in agreement with the timing generally proposed for the Alpine subduction and collision. Model predictions indicate that pre-D2 mineral assemblages may have developed during Paleocene at 60–90 km depth and 115–145 km from the trench, or, alternatively, during lower Eocene at ca. 70–90 km depth, and 135–160 km from the trench. Full article
(This article belongs to the Special Issue Orogenic Metamorphism of Oceanic Lithosphere)
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