20.500.12556/DiRROS-21001 Identifying crystal nucleation mechanisms in a synthetic trachybasalt: a multimodal approach 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. experimental petrology nucleation mechanisms X-ray microtomography crystal clustering heterogeneous nucleation eksperimentalna petrologija mehanizmi nukleacije rentgenska mikrotomografija kristalno združevanje v grozde heterogena nukleacija true false true Springer Angleški jezik Slovenski jezik © The Author(s) 2024 Neznano 2024-12-16 13:35:38 2024-12-16 13:44:07 2024-12-17 03:36:28 0000-00-00 00:00:00 2024 0 0 © The Author(s) 2024 str. 1-21 article no. 84 Vol. 179 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2024-08-20 552 1432-0967 10.1007/s00410-024-02161-w 218155267 https://link.springer.com/article/10.1007/s00410-024-02161-w 1 42fff037-bbaa-11ef-ba3f-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=29720 RAZ_Peres_Stefano_2024.pdf RAZ_Peres_Stefano_2024.pdf 1 82C4F54ED90300CE9A10C1D6C9FB2BDC 935dd7f275491a683a6fb42cf9e6dbfa3a5e38458230fa7513b98055de818993 5543c660-bbab-11ef-ba3f-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=29722 RAZ_Peres_Stefano_2024.pdf RAZ_Peres_Stefano_2024.pdf 1 03A09497D5BC03302F8BD68CF6DF85A7 960bc7f6b460b11cffd144fe98622ba6e495fc44144a21c9780c6d664e32b59d 63301492-bbab-11ef-ba3f-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=29723 RAZ_Peres_Stefano_2024.xlsx RAZ_Peres_Stefano_2024.xlsx 1 80D7391DA1C9753907DF21A063EB8848 81d84548a49f8c5876ba60379f0367e87bdf3a3534b02f2737b3ccac8ba6302c 6a683341-bbab-11ef-ba3f-001a4af901a5 https://dirros.openscience.si/Dokument.php?lang=slv&id=29724 Zavod za gradbeništvo Slovenije 0 0 0