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Geosciences
Special Issues
Metamorphism and Tectonic Evolution of Metamorphic Belts
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Metamorphism and Tectonic Evolution of Metamorphic Belts

A special issue of Geosciences (ISSN 2076-3263).

Deadline for manuscript submissions: closed (31 December 2024) | Viewed by 3200

Special Issue Editors

Dr. Adamantios A. Kilias

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Guest Editor
Department of Geology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
Interests: crustal deformation; tectonics; neotectonics; geodynamics; structural geology; active tectonics; geological mapping; regional geology; sedimentary basins; geology
Dr. Ilias Lazos

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Guest Editor
School of Mineral Resources Engineering, Technical University of Crete, 73100 Chania, Greece
Interests: active tectonics; crustal deformation; GNSS analysis; seismotectonics; tectonic geomorphology; structural geology; geological mapping
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Hans-Jürgen Gawlick

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Guest Editor
Department Applied Geosciences and Geophysics, Petroleum Geology, Montanuniversität Leoben, Leoben, Austria
Interests: geology; paleontology; paleoclimatology; sequence stratigraphy; basin analysis; regional geology; teectonics; geodynamics; geological mapping; geology
Special Issues, Collections and Topics in MDPI journals
Dr. Emmanouil Katrivanos

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Guest Editor Assistant
Department of Geology, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece
Interests: structural geology; geological mapping; field geology; geology; teaching Earth; sciences rocks; tectonics; analog modeling; geodynamics

Special Issue Information

Dear Colleagues,

The study of metamorphism and the tectonic evolution of metamorphic belts provides critical insights into the dynamic processes shaping the Earth's crust (compression vs. extension). By analyzing metamorphic rocks and their formation conditions, geologists can reconstruct the history of plate movements, the nature of past environments at great depths and the mechanisms driving the Earth's tectonic activities. This knowledge is fundamental to our understanding of the planet's geological past, present and future. We call for research contributions studying these closely related processes of metamorphism and structural evolution of metamorphic belts produced either during plate convergence, nappe stacking and crustal thickening or plate divergence, crustal thinning and the exhumation of deep crustal rocks.  As an example, we referred to the Himalayan Metamorphic Belt, The Alps, Dinnarides and Hellenides orogenic belts or the Franciscan complex in California.

Dr. Adamantios A. Kilias
Dr. Ilias Lazos
Prof. Dr. Hans-Jürgen Gawlick
Guest Editors

Dr. Emmanouil Katrivanos
Guest Editor Assistant

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. Geosciences 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 1800 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

  • compression
  • extension
  • nappe stacking
  • crustal exhumation
  • orogeny
  • subduction
  • obduction
  • metamorphism
  • migmatites

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Published Papers (2 papers)

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Research

31 pages, 83141 KiB  
Article
The Relationships between the Internal Nappe Zone and the Regional Mylonitic Complex in the NE Variscan Sardinia (Italy): Insight from a New Possible Regional Interpretation?
by Franco Marco Elter and Federico Mantovani
Geosciences 2024, 14(10), 260; https://doi.org/10.3390/geosciences14100260 - 28 Sep 2024
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Abstract
This study presents an updated interpretation of geological data collected between 1984 and 2022. The area under consideration holds significant regional importance as it is located between the Internal Nappe Zone (INZ) and the Regional Mylonitic Complex (RMC). Re-evaluation of the geological data [...] Read more.
This study presents an updated interpretation of geological data collected between 1984 and 2022. The area under consideration holds significant regional importance as it is located between the Internal Nappe Zone (INZ) and the Regional Mylonitic Complex (RMC). Re-evaluation of the geological data has highlighted a more intricate structural framework than what is currently documented in the existing literature. This paper aims to illustrate, through structural analysis, that the Posada Valley Shear Zone (PVSZ) does not serve as the transitional boundary between the Inner Nappe Zone and the Regional Mylonitic Complex or High-Grade Metamorphic Complex (HGMC) as traditionally thought. Instead, the authors’ findings indicate that the transition boundary is confined to a shear band with a variable thickness ranging from 10 to 70 m at its widest points. The development of the Posada Valley Shear Zone is characterized by a series of transitions from mylonite I S-C to mylonite II S-C, extending over approximately 5 km. The formation of the Posada Valley Shear Zone is chronologically confined between the development of the East Variscan Shear Zone (EVSZ) and the emplacement of the Late Variscan granites. The differing orientations of Sm and S3 observed in the mylonitic events of the Posada Valley Shear Zone and the Regional Mylonitic Complex, respectively, are likely attributable to an anticlockwise rotation of the shortening directions during the upper Carboniferous period. Furthermore, this study proposes that the Condensed Isogrades Zone (CIZ), despite its unclear formation mechanism, should be recognized as the true transition zone between the Inner Nappe Zone and the Regional Mylonitic Complex or High-Grade Metamorphic Complex. This new interpretation challenges the previously accepted notion of increasing Variscan metamorphic zonation toward the northeast. This conclusion is supported by the identification of the same NE–SW orientation of the D2 tectonic event in both the Old Gneiss Complex (OGC in the Regional Mylonitic Complex) and the lithologies of the Inner Nappe Zone and the Condensed Isogrades Zone. The comprehensive analysis and new insights provided in this paper contribute to a refined understanding of the geological relationships and processes within this region, offering significant implications for future geological studies and interpretations. Full article
(This article belongs to the Special Issue Metamorphism and Tectonic Evolution of Metamorphic Belts)
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26 pages, 35034 KiB  
Article
Strain Analysis and Kinematics of Deformation of the Tectonic Nappe Pile in Olympos-Ossa Mountainous Area: Implication for the Exhumation History of the HP/LT Ampelakia Unit and the Olympos-Ossa Tectonic Window (Eastern Thessaly, Central Greece)
by Ioannis Vrontzos, Emmanouil Katrivanos, Ilias Lazos, Lambrini Papadopoulou and Adamantios Kilias
Geosciences 2024, 14(7), 179; https://doi.org/10.3390/geosciences14070179 - 28 Jun 2024
Viewed by 1120
Abstract
This paper focuses on the structural and finite strain analysis of the Pelagonian nappe, the HP/LT Ampelakia unit, and the Olympos-Ossa unit in the Olympos-Ossa mountainous area in order to better understand the exhumation history of the Ampelakia unit and the underlain Olympos-Ossa [...] Read more.
This paper focuses on the structural and finite strain analysis of the Pelagonian nappe, the HP/LT Ampelakia unit, and the Olympos-Ossa unit in the Olympos-Ossa mountainous area in order to better understand the exhumation history of the Ampelakia unit and the underlain Olympos-Ossa unit. Two main stages of Tertiary deformation were revealed, related to nappe stacking and exhumation processes. During the Paleocene–Eocene crustal subduction, HP/LT metamorphism, compression, and nappe stacking were developed progressively. This D1 stage was terminated with the final SW-ward emplacement of the Ampelakia and Pelagonian nappe on the Olympos-Ossa unit during the Eocene–Early Oligocene. The next stage of deformation, D2, was developed during the Oligocene–Miocene following the orogenic nappes stacking. D2 was considered an extensional event, related to metamorphic isothermal decompression, nappes tectonic denudation, crustal uplift, and final exhumation of the Ampelakia unit and the Olympos-Ossa unit as a tectonic window. The calculated finite strain ellipsoids indicate a main flattening type strain geometry and middle strain intensity, increasing along the nappe contacts. The quartz C-axes diagrams also reveal a flattening type of deformation and non-coaxial flow towards the southwest and northeast at the western and eastern flanks of Olympos-Ossa Mountain, respectively. The calculated Wk vorticity number ranges from 0.23 to 0.93. Full article
(This article belongs to the Special Issue Metamorphism and Tectonic Evolution of Metamorphic Belts)
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