Advances in Structural Geology: From Deformational Processes to Geo-Resource Exploration

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

Deadline for manuscript submissions: 30 June 2025 | Viewed by 1747

Special Issue Editors


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Guest Editor
Department of Earth and Environmental Sciences, University of Milano-Bicocca, Milano, Italy
Interests: structural geology; geochronology; shear zones, deformation; microstructures; field mapping

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Guest Editor
Department of Earth and Geoenvironmental Sciences, University of Bari Aldo Moro, Bari, Italy
Interests: structural geology; fluid–rock interaction; exhumed geothermal systems; tectonics; fluid inclusions; field mapping

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Guest Editor
Department of Chemistry Physics Mathematics and Natural Sciences, University of Sassari, Sassari, Italy
Interests: normal faults; seismotectonics; earthquakes; western alps; exhumation; folds (geology); geothermal fields; central Italy; volcanic eruptions; maars; volcanology

Special Issue Information

Dear Colleagues,

This Special Issue focuses on advances in the methods and perspectives applied to structural geology alongside the classical approaches in this field.

Constraining the timing of tectonic events is crucial to establishing an in-depth understanding of the complex evolution of different geodynamic settings through space and time. The deformation of different crustal sectors often results in poly-deformed rocks, potentially associated with low- to high-grade metamorphism. These deformed rocks are often bounded by crustal-scale shear zones and/or brittle, long-lived faults. Their spatial and temporal variations and the evolution of wall rocks can be determined by analyzing microstructures that have repercussions for both geological processes and regional tectonics.

The integration of new and classical techniques, including detailed geological field mapping, macro- and micro-structural analysis, metamorphic petrology, fluid–rock interaction, and geochronology, is highly desirable. This multidisciplinary approach helps determine the pressure–temperature–deformation–time (P-T-D-t) path of deformed rocks, framing the development of geo-resources and defining fracture networks that could be useful for reservoir characterization and geo-storage.

We welcome the contribution of multidisciplinary studies covering both brittle and ductile domains, possibly involving thermochronology, thermodynamic and numerical modelling. This issue will also provide visibility to young scientists aiming to upscale their regional findings.

Dr. Chiara Montemagni
Dr. Martina Zucchi
Dr. Giovanni Luca Cardello
Guest Editors

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Keywords

  • structural geology
  • deformation
  • microstructural analyses
  • tectonic evolution
  • geochronology
  • fluid–rock interaction
  • syn-tectonic mineralization
  • geo-resources
  • remote sensing

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Published Papers (1 paper)

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Research

24 pages, 11232 KiB  
Article
Microstructural Investigation of Variscan Late-Collisional Granitoids (Asinara Island, NW Sardinia, Italy): New Insights on the Relationship Between Regional Deformation and Magma Emplacement
by Diego Pieruccioni, Matteo Simonetti, Salvatore Iaccarino, Chiara Montomoli and Rodolfo Carosi
Geosciences 2025, 15(3), 108; https://doi.org/10.3390/geosciences15030108 - 18 Mar 2025
Viewed by 727
Abstract
In the framework of the geological mapping of sheet “n. 425—Asinara Island” (NW Sardinia, Italy) of the Italian National Geological Mapping Project (CARG Project), three late- to post-collisional Variscan intrusive units are recognized: (i) Castellaccio Unit; (ii) Punta Sabina Unit; and (iii) sheeted [...] Read more.
In the framework of the geological mapping of sheet “n. 425—Asinara Island” (NW Sardinia, Italy) of the Italian National Geological Mapping Project (CARG Project), three late- to post-collisional Variscan intrusive units are recognized: (i) Castellaccio Unit; (ii) Punta Sabina Unit; and (iii) sheeted dyke complex. Granitoid rocks from these intrusive units intruded into the medium- to high-grade metamorphic micaschist and paragneiss and the migmatitic complex. A range of deformation microstructures from sub-magmatic to low-temperature subsolidus conditions are recognized. The main observed microstructures are represented by chessboard patterns in quartz and by feldspar sub-grain rotation dynamic recrystallization, indicative of deformation at high-temperature conditions (T > 650 °C). Solid-state high-temperature deformations (T > 450 °C) are provided by feldspar bulging, myrmekites, quartz grain boundary migration and sub-grain rotation dynamic recrystallization. Low-temperature sub-solidus microstructures (T < 450 °C) consist of quartz bulging, mica kinks, and feldspar twinning and bending. These features highlight that the three intrusive units recorded tectonic stresses, which affected the granitoids during cooling without developing a strong penetrative meso/microstructural fabric, as observed in other sectors of the Variscan orogen. The complete sequence of deformation microstructures, recorded in all intrusive units, suggests a weak but still ongoing deformation regime during granitoid emplacement in the Variscan orogen of northwestern Sardinia. These observations are similar to the features highlighted in other sectors of the southern Variscan belt and suggest a complex interplay between transpressional-induced exhumation of the middle/deep crust and magma intrusion. Full article
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