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Geosciences, Volume 15, Issue 2

February 2025 - 41 articles

Cover Story: In collision belts, the upper plate is often less deformed than the lower one. During the Variscan orogeny, the Armorica microcontinent was in the upper plate of the collision system. In Brittany (France), Armorica exposes poly-metamorphic micaschists. An early event with biotite–garnet–staurolite–kyanite assemblage crystallized at 0.9 GPa and 500 °C. It was followed by a HT event at 800–900 °C, dated by LA-ICP-MS on monazite at 351 Ma. This tectono-metamorphic evolution shows that Armorica was not rigid but underwent a syn-metamorphic ductile deformation during the Variscan collision at 360–355 Ma, redefined as the late episode of the “Bretonian phase”, whereas the pre-Famennian Bretonian episode is ascribed to oceanic subduction. These new data allow us to reassess the geodynamics of the Variscan orogen. View this paper
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Articles (41)

  • Article
  • Open Access
2 Citations
1,070 Views
22 Pages

Causes of Slope Deformations in Built-Up Areas and the Elimination of Emergencies with Regard to Population Protection

  • Miroslav Betuš,
  • Martin Konček,
  • Marian Šofranko,
  • Andrea Rosová,
  • Marek Szücs and
  • Kristína Horizralová

The presented article discusses the possibilities and methods of carrying out evacuation works in the event of an emergency associated with slope deformation in the built-up area of Šalgovík, Slovak Republic. From the point of view of extraordinary e...

  • Article
  • Open Access
1,301 Views
32 Pages

Assessment of Chemical Pollution Load in Surface Waters of the Turkestan Region and Its Indirect Impact on Landscapes: A Comprehensive Study

  • Dana Akhmetova,
  • Zhanar Ozgeldinova,
  • Nurgul Ramazanova,
  • Saltanat Sadvakassova,
  • Zhansulu Inkarova,
  • Rabiga Kenzhebay,
  • Zhadra Shingisbayeva,
  • Roza Abildaeva,
  • Zakhida Kozhabekova and
  • Manira Alagujayeva
  • + 1 author

This study is aimed at a comprehensive assessment of the chemical composition of surface waters in the Turkestan region and their impact on regional landscapes. The primary objective of the research is to systematically evaluate the level of chemical...

  • Article
  • Open Access
1,340 Views
29 Pages

Variscan Plutonism in the Geodynamic Evolution of the Central Iberian Zone of Portugal: Castelo Branco Pluton as Another Piece of the Puzzle

  • Cláudia Cruz,
  • Helena Sant’Ovaia,
  • Helena C. B. Martins,
  • Isabel M. H. R. Antunes,
  • Armando Rocha and
  • Fernando Noronha

A multidisciplinary analysis of the Pennsylvanian Castelo Branco pluton of Central Iberian Zone (Iberian Variscan belt) was made, focusing on its magnetic behavior and fabric, microstructures, microfractures, and radiometric and gravimetric anomalies...

  • Article
  • Open Access
856 Views
30 Pages

Longchahe porphyritic granite is the largest pluton within the western Gejiu complex, a series of mainly intermediate to felsic alkali intrusions in southwestern China. Our research indicates that the pluton intruded during the Late Cretaceous (82&nd...

  • Article
  • Open Access
982 Views
22 Pages

The semi-automated extraction of landforms using GIS analysis is one of the main topics in computer analyses. The use of digital elevation models (DEMs) in GIS applications makes the extraction and classification procedure of landforms easier and fas...

  • Article
  • Open Access
1 Citations
1,280 Views
21 Pages

Foundations for an Operational Earthquake Prediction System

  • Angelo De Santis,
  • Gianfranco Cianchini,
  • Loredana Perrone,
  • Maurizio Soldani,
  • Habib Rahimi and
  • Homayoon Alimoradi

Earthquake prediction is one of the most challenging enterprises of science. Any prediction system must be based on the search for a precursor appearing during the preparation phase of an earthquake in the ground, atmosphere, or ionosphere that can a...

  • Review
  • Open Access
1,817 Views
22 Pages

A Review of Carboniferous-Triassic Tectonic-Magmatic Evolution of Luang Prabang–Loei Metallogenic Belt in Laos and Thailand and Implications for Gold–Copper Mineralization

  • Linnan Guo,
  • Khin Zaw,
  • Shusheng Liu,
  • Yongfei Yang,
  • Fei Nie,
  • Songyang Wu,
  • Meifeng Shi,
  • Chunmei Huang,
  • Xiangfei Zhang and
  • Huimin Liang
  • + 2 authors

The Luang Prabang (Laos)–Loei (Thailand) metallogenic belt is located on the northwestern margin of the Indochina Block. It is one of the most important gold–copper metallogenic belts in Southeast Asia. This region underwent tectonic and...

  • Article
  • Open Access
1 Citations
1,406 Views
21 Pages

Estimation of Equivalent Pore Aspect Ratio in Rock Physics Models and Validation Using Digital Rocks

  • Luiz Eduardo Queiroz,
  • Dario Grana,
  • Celso Peres Fernandes,
  • Tapan Mukerji,
  • Leandro Passos de Figueiredo and
  • Iara Frangiotti Mantovani

Complex pore structures with multiple inclusions challenge the predictive accuracy of rock physics models. This study introduces a novel method for estimating a single equivalent pore aspect ratio that optimizes rock physics model predictions by mini...

  • Article
  • Open Access
2,984 Views
26 Pages

The Salento Leccese coast (southern Apulia, Italy) is marked both by primary and secondary coasts (cliffs and beaches); beaches, in particular, constitute about a quarter of the coastal perimeter. The Salento Leccese coast experienced dramatic change...

  • Article
  • Open Access
8 Citations
1,171 Views
22 Pages

Research and Application of Geomechanics Using 3D Model of Deep Shale Gas in Luzhou Block, Sichuan Basin, Southwest China

  • Ye Chen,
  • Wenzhe Li,
  • Xudong Wang,
  • Yuan Wang,
  • Li Fu,
  • Pengcheng Wu and
  • Zhiqiang Wang

The deep shale gas resources of the Sichuan Basin are abundant and constitute an important component of China’s natural gas production. Complicated by fault zones and other geostructures, the in situ stress state of the deep shale gas reservoir...

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Geosciences - ISSN 2076-3263Creative Common CC BY license