Combining traditional and quantitative multiscale structural analysis to reconstruct the tectono-metamorphic evolution of migmatitic basements: the case of the Valpelline Series, Dent-Blanche Tectonic System, Western Alps

Caso, F.; Piloni, C.B.; Filippi, M.; Pezzotta, A.; Fazio, E.; Visalli, R.; Ortolano, G.; Roda, M.; Zucali, M.

doi:10.1016/j.jsg.2024.105099

Journal of Structural Geology

2024

DOI: 10.1016/j.jsg.2024.105099

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Combining traditional and quantitative multiscale structural analysis to reconstruct the tectono-metamorphic evolution of migmatitic basements: the case of the Valpelline Series, Dent-Blanche Tectonic System, Western Alps

F. Caso,

C.B. Piloni,

M. Filippi

et al.

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2024

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Cited by 2 publications

References 56 publications

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A journey through ductile to brittle deformation of rocks: How traditional geoscience benefits from innovations – An introduction

Fazio,

Ortolano,

Monaco

et al. 2024

Journal of Structural Geology

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A journey through ductile to brittle deformation of rocks: How traditional geoscience benefits from innovations – An introduction

Fazio,

Ortolano,

Monaco

et al. 2024

Journal of Structural Geology

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Comparison between 2D and 3D microstructures and implications for metamorphic constraints using a chloritoid–garnet-bearing mica schist

Caso,

Petroccia,

Nerone

et al. 2024

Eur. J. Mineral.

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Abstract. Despite the fact that rock textures depend on the 3D spatial distribution of minerals, our tectono-metamorphic reconstructions are mostly based on a 2D visualisation (i.e. thin sections). This work compares 2D and 3D investigations of petrography and microstructures, modal abundances, and local bulk rock composition and their implication for P–T estimates, showing the pros and cons and reliability of 2D analysis. For this purpose, a chloritoid–garnet-bearing mica schist from the Dora-Maira Massif in the Western Alps has been chosen. In particular, for 2D a thin section scan has been combined with chemical X-ray maps, whereas for 3D the X-ray computerised axial microtomography (µCT) has been applied. Two-dimensional investigations are readily accessible and straightforward but do not consider the entire rock volume features. Conversely, the rise of 3D techniques offers a more comprehensive and realistic representation of metamorphic features in the 3D space. However, they are computationally intensive, requiring specialised tools and expertise. The choice between these approaches should be based on the research aims, available resources, and the level of detail needed to address specific scientific questions. Nevertheless, despite differences in the modal distribution, the estimated bulk rock compositions and relative thermodynamic modelled phase fields show similarities when comparing the 2D and 3D results. Also, since different thin section cut orientations may influence the results and consequent interpretations, three different cuts from the 3D model have been extrapolated and discussed (i.e. XZ, YZ, and XY planes of the finite-strain ellipsoid). This study quantitatively corroborates the reliability of the thin section approach for tectono-metamorphic reconstructions, still emphasising that 3D visualisation can help understand rock textures.

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Combining traditional and quantitative multiscale structural analysis to reconstruct the tectono-metamorphic evolution of migmatitic basements: the case of the Valpelline Series, Dent-Blanche Tectonic System, Western Alps

Cited by 2 publications

References 56 publications

A journey through ductile to brittle deformation of rocks: How traditional geoscience benefits from innovations – An introduction

A journey through ductile to brittle deformation of rocks: How traditional geoscience benefits from innovations – An introduction

Comparison between 2D and 3D microstructures and implications for metamorphic constraints using a chloritoid–garnet-bearing mica schist

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