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Your search keyword '"Nestola, F."' showing total 8 results
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8 results on '"Nestola, F."'

5. Protogenetic garnet inclusions and the age of diamonds

Author

Nestola, F., primary, Jacob, D.E., additional, Pamato, M.G., additional, Pasqualetto, L., additional, Oliveira, B., additional, Greene, S., additional, Perritt, S., additional, Chinn, I., additional, Milani, S., additional, Kueter, N., additional, Sgreva, N., additional, Nimis, P., additional, Secco, L., additional, and Harris, J.W., additional

Published
2019
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7. Fossil subduction recorded by quartz from the coesite stability field.

Author

Alvaro, M., Mazzucchelli, M. L., Angel, R. J., Murri, M., Campomenosi, N., Scambelluri, M., Nestola, F., Korsakov, A., Tomilenko, A. A., Marone, F., and Morana, M.

Subjects
*FOSSILS, *METAMORPHIC rocks, *ELASTICITY, *GARNET, *CHEMICAL equilibrium, *MINERAL properties, *QUARTZ
Abstract

Metamorphic rocks are the records of plate tectonic processes whose reconstruction relies on correct estimates of the pressures and temperatures (P-T) experienced by these rocks through time. Unlike chemical geothermobarometry, elastic geobarometry does not rely on chemical equilibrium between minerals, so it has the potential to provide information on overstepping of reaction boundaries and to identify other examples of non-equilibrium behavior in rocks. Here we introduce a method that exploits the anisotropy in elastic properties of minerals to determine the unique P and T of entrapment from a single inclusion in a mineral host. We apply it to preserved quartz inclusions in garnet from eclogite xenoliths hosted in Yakutian kimberlites (Russia). Our results demonstrate that quartz trapped in garnet can be preserved when the rock reaches the stability field of coesite (the high-pressure and hightemperature polymorph of quartz) at 3 GPa and 850 °C. This supports a metamorphic origin for these xenoliths and sheds light on the mechanisms of craton accretion from a subducted crustal protolith. Furthermore, we show that interpreting P and T conditions reached by a rock from the simple phase identification of key inclusion minerals can be misleading. [ABSTRACT FROM AUTHOR]

Published
2020
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8. Fossil subduction recorded by quartz from the coesite stability field

Author

Anatoly A. Tomilenko, Nicola Campomenosi, Federica Marone, Ross J. Angel, Marco Scambelluri, Matteo Alvaro, Mara Murri, Fabrizio Nestola, Andrey V. Korsakov, Mattia L. Mazzucchelli, Marta Morana, Alvaro, M, Mazzucchelli, M, Angel, R, Murri, M, Campomenosi, N, Scambelluri, M, Nestola, F, Korsakov, A, Tomilenko, A, Marone, F, and Morana, M

Subjects
010504 meteorology & atmospheric sciences, Subduction, Field (physics), Geology, engineering.material, 010502 geochemistry & geophysics, 01 natural sciences, Coesite, engineering, Petrology, elastic geobarometry, quartz, Quartz, 0105 earth and related environmental sciences
Abstract

Metamorphic rocks are the records of plate tectonic processes whose reconstruction relies on correct estimates of the pressures and temperatures (P-T) experienced by these rocks through time. Unlike chemical geothermobarometry, elastic geobarometry does not rely on chemical equilibrium between minerals, so it has the potential to provide information on overstepping of reaction boundaries and to identify other examples of non-equilibrium behavior in rocks. Here we introduce a method that exploits the anisotropy in elastic properties of minerals to determine the unique P and T of entrapment from a single inclusion in a mineral host. We apply it to preserved quartz inclusions in garnet from eclogite xenoliths hosted in Yakutian kimberlites (Russia). Our results demonstrate that quartz trapped in garnet can be preserved when the rock reaches the stability field of coesite (the high-pressure and high-temperature polymorph of quartz) at 3 GPa and 850 °C. This supports a metamorphic origin for these xenoliths and sheds light on the mechanisms of craton accretion from a subducted crustal protolith. Furthermore, we show that interpreting P and T conditions reached by a rock from the simple phase identification of key inclusion minerals can be misleading.

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