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265 results on '"Capponi, Giovanni"'

2. A continent-wide detailed geological map dataset of Antarctica

Author

Cox, Simon C., Smith Lyttle, Belinda, Elkind, Samuel, Smith Siddoway, Christine, Morin, Paul, Capponi, Giovanni, Abu-Alam, Tamer, Ballinger, Matilda, Bamber, Lauren, Kitchener, Brett, Lelli, Luigi, Mawson, Jasmine, Millikin, Alexie, Dal Seno, Nicola, Whitburn, Louis, White, Tristan, Burton-Johnson, Alex, Crispini, Laura, Elliot, David, Elvevold, Synnøve, Goodge, John, Halpin, Jacqueline, Jacobs, Joachim, Martin, Adam P., Mikhalsky, Eugene, Morgan, Fraser, Scadden, Phil, Smellie, John, and Wilson, Gary

Published
2023
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3. A comprehensive 1:250,000 scale geological map of the Convoy Range and Franklin Island quadrangles (Victoria Land, Antarctica)

Author

Capponi, Giovanni, primary, Montomoli, Chiara, primary, Simonetti, Matteo, primary, Salvatore, Maria Cristina, primary, Casale, Stefano, primary, Musumeci, Giovanni, primary, Cox, Simon, primary, Smith Lyttle, Belinda, primary, Pertusati, Piero Carlo, primary, Läufer, Andreas, primary, Mörs, Thomas, primary, and Unverfärth, Jan, primary

Published
2024
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10. Ophiolite melange zone records exhumation in a fossil subduction channel

Author

Federico, Laura, Crispini, Laura, Scambelluri, Marco, and Capponi, Giovanni

Subjects
Western Alps -- Environmental aspects, Breccia -- Structure, Geochronology -- Usage, Subduction zones (Geology) -- Observations, High pressure research, Earth sciences
Abstract

Recent models propose that the exhumation of high-pressure rocks occurs by means of return flow inside a low-viscosity channel of serpentinite situated between the plates. To test this hypothesis, we investigated a serpentinite melange in the Western Alps, which contains exotic mafic and metasedimentary tectonic blocks, recording heterogeneous metamorphic evolutions and variable high-pressure ages. The peak metamorphic conditions range from eclogite- to garnet-blueschist-facies. The structural evidence and the pressure-temperature paths of the different blocks suggest coupling between blocks and matrix, at least in the blueschist facies. [sup.39]Ar-[sup.40]Ar dating indicates eclogite-facies peak at ca. 43 Ma and blueschist-facies peak at ca. 43 and 40 Ma in different blocks, respectively. These data point to diachronous metamorphic paths resulting from independent tectonic evolutions of the different slices. We therefore propose that this melange formed during exhumation of subducted rocks equilibrated at different depths inside a subduction channel. This mechanism can be extended to other serpentinite melanges in the Alps and other orogens (e.g., the Cyclades, the Coast Ranges of California) for which a growing heterogeneity in the timing of metamorphic equilibration and of pressure-temperature paths can be expected with further investigations. Keywords: subduction channel; tectonic melange; Western Alps; high-pressure, [sup.39]Ar-[sup.40]Ar geochronology

Published
2007

26. Cyclic fault-controlled mass transfer during gold mineralisation in carbonated ultramafites (Bisciarelle stream, Voltri Massif, Ligurian Alps)

Author

Scarsi, Marco, Crispini, Laura, Garofalo, P. S. 2., Graham Gundlach, A. 3., Schwarz, G. 3., Günther, D. 3., and Capponi, Giovanni

Subjects
Thrust fault, carbonate-coated grain, Thrust fault, carbonate-coated grain, mass transfer, hydrothermal alteration, gold mineralisation, mass transfer, hydrothermal alteration, gold mineralisation
Published
2017

29. Geodynamic evolution of a subduction plate interface: constraints from the study of lawsonite-bearing eclogite in the mélange of the Voltri Massif (Ligurian Alps, Italy)

Author

Scarsi, Marco, Malatesta, Cristina, Fornasaro, Silvia, Crispini, Laura, and Capponi, Giovanni

Subjects
Lawsonite-bearing eclogite, thermodynamic modelling, subduction plate interface, low viscosity serpentinite channel, Ligurian western Alps, Voltri massif, Ligurian western Alps, Voltri massif, Lawsonite-bearing eclogite, thermodynamic modelling, subduction plate interface, low viscosity serpentinite channel
Published
2017

34. The asbestos risk in meta-ophiolitic rocks: a protocol for preliminary field and laboratory investigations during geological mapping

Author

Solimano Monica, Crispini Laura, Poggi Eugenio, Capponi Giovanni, and Marescotti Pietro

Subjects
OPHIOLITES, Outcrop, Schist, Geochemistry, Weathering, Cataclastic rock, engineering.material, medicine.disease_cause, SERPENTINITE, Asbestos, Actinolite, Mining engineering, Riebeckite, visual_art, ASBESTOS, medicine, engineering, visual_art.visual_art_medium, Tremolite, geological mapping, Geology
Abstract

We report the results of preliminary field and laboratory multidisciplinary investigations developed during the geological mapping of the 1:50,000 Spigno Monferrato quadrangle (Project of Geological mapping, Regione Liguria); this study was aimed: (1) to georefer and classify meta-ophiolitic outcrops, not only on the basis of the occurrence of asbestos-bearing rocks, but also with regard to the potential risks induced by the release of asbestos fibers into the environment; (2) to test a pilot protocol for the selection and classification of the most significant asbestos-bearing outcrops in meta-ophiolitic terrains. The results indicate that asbestos minerals occur widely in serpentinite (chrysotile) and to lesser extent in chlorite-amphibole schist and amphibole-bearing metabasite (mainly tremolite, actinolite, and riebeckite). The highest asbestos fiber concentrations in the studied rocks and their potential to be released are strictly related to the tectonic fabric of the host rocks, with mylonitic and cataclastic zones representing the worst scenario. As mylonitic and cataclastic rocks along shear and fault zones are mostly foliated and brecciated, they represent critical sites for accelerated erosion. Hence, their exposure to weathering and physical erosion commonly determines the natural release of asbestos fibers and fiber-bundles that accumulate in the debris at the foot of the outcrops and in the derived soils.

Published
2015

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