| Naslov: | Identifying crystal nucleation mechanisms in a synthetic trachybasalt: a multimodal approach |
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| Avtorji: | ID Peres, Stefano (Avtor)
ID Griffiths, Thomas A. (Avtor)
ID Colle, Fabio (Avtor)
ID Lelarge, Stefano Iannini (Avtor)
ID Masotta, Matteo (Avtor)
ID Pontesilli, Alessio (Avtor)
ID Mancini, Lucia (Avtor)
ID Abart, Rainer (Avtor) |
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| Datoteke: |  URL - Izvorni URL, za dostop obiščite https://link.springer.com/article/10.1007/s00410-024-02161-w
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To gradivo ima še več datotek. Celoten seznam je na voljo
spodaj. |
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| Jezik: | Angleški jezik |
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| Tipologija: | 1.01 - Izvirni znanstveni članek |
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| Organizacija: |  ZAG - Zavod za gradbeništvo Slovenije
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| Povzetek: | To develop new criteria to distinguish different crystal nucleation mechanisms in silicate melts, we performed crystallization experiments using a synthetic hydrous (2 wt% H2O) trachybasalt and combined three-dimensional information from synchrotron X-ray computed microtomography with two-dimensional mapping of crystallographic orientation relationships (CORs) using electron backscatter diffraction. Crystallization experiments were performed at 400 MPa by cooling the melt from 1300 °C to resting temperatures of 1150 and 1100 °C and maintaining isothermal conditions for 30 min and 8 h. Three distinct titanomagnetite (Tmt) populations formed: (1) skeletal crystals, isolated or partially embedded in clinopyroxene (Cpx); (2) anhedral crystals, always attached to Cpx; (3) flattened needle-shaped crystals, embedded in Cpx. These morphologically different Tmt populations formed in response to one cooling event, with varying nucleation mechanisms and at different undercooling conditions. The clustered three-dimensional distribution of population 2 and 3 Tmt grains and the high proportion of Tmt-Cpx interfaces sharing CORs indicate that these Tmt grains heterogeneously nucleated on Cpx. The near-random three-dimensional distribution of (often isolated) population 1 Tmt grains, together with the low proportion of Tmt-Cpx interfaces sharing CORs, imply their isolated, possibly homogeneous nucleation, potentially followed by heterogeneous nucleation of Cpx on population 1 Tmt. Heterogeneous nucleation in slightly to moderately undercooled magmas should affect the sequence of crystallization as well as morphology and clustering of crystals, which may actively contribute to the variation of rheological parameters like viscosity. Finally, observed intra- and inter-sample variations in Tmt-Cpx COR frequencies indicate the potential for this parameter to record further petrological information. |
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| Ključne besede: | experimental petrology, nucleation mechanisms, X-ray microtomography, crystal clustering, heterogeneous nucleation |
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| Status publikacije: | Objavljeno |
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| Verzija publikacije: | Objavljena publikacija |
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| Datum objave: | 20.08.2024 |
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| Založnik: | Springer |
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| Leto izida: | 2024 |
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| Št. strani: | str. 1-21 |
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| Številčenje: | Vol. 179, article no. 84 |
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| PID: | 20.500.12556/DiRROS-21001  |
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| UDK: | 552 |
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| ISSN pri članku: | 1432-0967 |
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| DOI: | 10.1007/s00410-024-02161-w |
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| COBISS.SI-ID: | 218155267 |
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| Avtorske pravice: | © The Author(s) 2024 |
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| Opomba: | © The Author(s) 2024 |
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| Datum objave v DiRROS: | 16.12.2024 |
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| Število ogledov: | 49 |
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| Število prenosov: | 33 |
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| Metapodatki: |    |
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