Continuous vs. discontinuous garnet growth in mylonitic micaschists from northeastern Sardinia, Italy: Evidence from LA-ICPMS trace element mapping

Cruciani, Gabriele; Fancello, Dario; Franceschelli, Marcello; Rubatto, Daniela

doi:10.1016/j.lithos.2023.107436

Lithos

2024

DOI: 10.1016/j.lithos.2023.107436

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Continuous vs. discontinuous garnet growth in mylonitic micaschists from northeastern Sardinia, Italy: Evidence from LA-ICPMS trace element mapping

Gabriele Cruciani,

Dario Fancello,

Marcello Franceschelli

et al.

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Cited by 2 publications

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Phase characterisation in minerals and metals using an SEM-EDS based automated mineralogy system

Kostryzhev,

Murphy

2024

Methods in Microscopy

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Advanced Mineral Identification and Characterisation System (AMICS) is based on energy dispersive X-ray spectroscopy (EDS) utilised in a scanning electron microscope (SEM). A specially designed software controls the sample positioning inside the microscope chamber, EDS spectra acquisition and analysis, phase identification, and results visualisation in the form of maps, graphs and tables. Characterisation can be conducted automatically for up to 28 mounted samples in a Hitachi SU3900 SEM with or without coating. Many options exist for an experienced researcher to influence the analysis process: (i) extract a spectrum for each acquisition point and determine chemical composition at this point, (ii) visualise mineral maps for each phase or a group of phases to characterise their interactions, (iii) determine the particle geometry-chemistry relationship, (iv) conduct statistical analysis of EDS spectra, define presence of solute elements, and visualise distribution of particles with a particular chemical composition, (v) manually develop the spectra database for unknown phases and solid solutions. This paper briefly outlines the AMICS software features and selected results for phase characterisation in minerals, metal alloys, and nanoparticle mixtures (MOFs and ZIFs). The influence of data acquisition methodology on accuracy and depth of characterisation is discussed.

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Phase characterisation in minerals and metals using an SEM-EDS based automated mineralogy system

Kostryzhev,

Murphy

2024

Methods in Microscopy

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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?

Elter,

Mantovani

2024

Geosciences

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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.

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Continuous vs. discontinuous garnet growth in mylonitic micaschists from northeastern Sardinia, Italy: Evidence from LA-ICPMS trace element mapping

Cited by 2 publications

References 61 publications

Phase characterisation in minerals and metals using an SEM-EDS based automated mineralogy system

Phase characterisation in minerals and metals using an SEM-EDS based automated mineralogy system

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?

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