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Metasomatism-Control Led Nucleation And Development Of Paired-Shear Zones: A Case Study From The Neves Area (Eastern Alps, Italy).pdf

EGU2016-14371.pdf
Preview of Metasomatism-Control led Nucleation and Development of Paired-Shear Zones: A Case Study from the Neves Area (Eastern Alps, Italy)
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Summary

This study investigates the formation and development of paired-shear zones in the Neves area of the Eastern Alps (Italy), focusing on the interaction between fluid transfer, metasomatism, mineral reactions, and deformation. The authors analyze a Variscan granodiorite affected by Alpine deformation under amphibolite facies conditions.

Key findings include:

1. Metasomatic Bleached Zone: A bleached zone, composed primarily of quartz and feldspar, surrounds fractures, indicating fluid-rock interaction leading to mineral alteration.

2. Paired-Shear Zones: Shear zones nucleate on the walls of the bleached zone, with new metamorphic phases crystallizing at the expense of primary magmatic and secondary metasomatic phases.

3. Garnet Formation: Garnet exhibits distinct morphologies depending on its textural setting. Euhedral garnets have enriched-Mn cores and Fe rims, while atoll garnets (present only in the bleached zone) have Mn-rich cores and Ca-rich rims, suggesting a two-stage formation process.

4. Temperature Estimates: The ductile deformation stage associated with metasomatism is estimated at 520°C - 0.55 GPa. Late brittle reactivation occurred at approximately 225°C.

5. Conclusion: The study demonstrates that early fluid-rock interaction leads to the formation of viscosity contrasts, localizing deformation within initially isotropic rock. Both ductile and brittle deformations are linked to fluid and chemical mass transfer, emphasizing the importance of considering fluid-assisted chemical processes in understanding strain localization.

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Description

This study investigates the formation of a ductile shear zone in the Neves area (Eastern Alps) through metasomatism—a process where chemical changes alter rock structure. It highlights the interplay between chemical and mechanical factors in strain localization within the crust. The research provides insights into the development of paired-shear zones by examining mineralogical and compositional shifts during deformation.

Technical Information

  • File Format: PDF
  • File Size: 40 KB
  • Pages: 1
  • Language: EN
  • Total Downloads: 54
  • Last Updated: 2 weeks ago

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Metasomatism-Control guideMetasomatism-Control tutorialNucleation guideNucleation tutorialDevelopment guideDevelopment tutorialPaired-Shear guidePaired-Shear tutorialZones: guideZones: tutorialCase guideCase tutorialStudy guideStudy tutorialfrom guidefrom tutorialNeves guideNeves tutorialArea guideArea tutorial(Eastern guide(Eastern tutorialAlps, guideAlps, tutorialItaly) guideItaly) tutorial

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