Academic Journal
Kinetic partitioning of trace cations between zoned clinopyroxene and a variably cooled-decompressed alkali basalt: Thermodynamic considerations on lattice strain and electrostatic energies of substitution
| العنوان: | Kinetic partitioning of trace cations between zoned clinopyroxene and a variably cooled-decompressed alkali basalt: Thermodynamic considerations on lattice strain and electrostatic energies of substitution |
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| المؤلفون: | Mollo S., Moschini P., Ubide T., MacDonald A., Vetere F., Nazzari M., Misiti V., Miyajima N., Melai C., Di Genova D., Vona A., Di Fiore F., Romano C. |
| المساهمون: | Mollo, S., Moschini, P., Ubide, T., Macdonald, A., Vetere, F., Nazzari, M., Misiti, V., Miyajima, N., Melai, C., Di Genova, D., Vona, A., Di Fiore, F., Romano, C. |
| سنة النشر: | 2023 |
| المجموعة: | Università degli Studi di Siena: USiena air |
| مصطلحات موضوعية: | Clinopyroxene sector zoning, concentric zoning, and patchy zoning, Cooling and decompression, Kinetic partitioning, Lattice strain and electrostatic energies of cation substitutions |
| الوصف: | We present kinetic partitioning data for trace cations measured in zoned clinopyroxene crystals obtained from a variably cooled and decompressed olivine basalt erupted at Mt. Etna volcano in Italy. Supersaturation effects and compositional heterogeneities at the interface melt lead to the development of sector zoning, concentric zoning, and patchy zoning in clinopyroxene crystals. Apparent partition coefficients between compositionally different growth layers and adjacent melts (Di) for isovalent groups of trace elements are tested for internal consistency on the thermodynamic basis of lattice strain (ΔGstrain) and electrostatic (ΔGelec) energies of substitutions. The excess energy of partitioning (ΔGpartitioning) for trace cations in zoned crystals accounts for a kinetic incorporation control leading to large enthalpic effects through distortion of the lattice and changes in the electrostatic forces. ΔGpartitioning depends upon the complementary relationship between ΔGstrain and ΔGelec, which is the most appropriate thermodynamic description for the accommodation of rare earth elements and high field strength elements in the lattice site of zoned crystals. Polyhedral sectors, skeletal forms, and overgrowth zones have Di values settled by the number of charge-balanced and -imbalanced configurations taking place in the lattice site as a function of aluminium in tetrahedral coordination, and crystal structural changes produced by heterovalent cation substitutions. In an energetically unstable macroscopic system ruled by cooling and decompression, thermodynamic requirements for the crystallochemical control of Di encompass the attainment of local equilibrium at the crystal-melt interface via the establishment of small-volume reaction kinetics. The requisite of local interface equilibrium is however susceptible to the anisotropic growth velocity of each specific clinopyroxene surface, thereby giving reason to different energetic properties of the crystallographic site. This axiomatic control requires that transition ... |
| نوع الوثيقة: | article in journal/newspaper |
| وصف الملف: | STAMPA |
| اللغة: | English |
| ردمك: | 978-0-01-670372-0 0-01-670372-3 |
| Relation: | info:eu-repo/semantics/altIdentifier/wos/WOS:001098834800001; volume:361; firstpage:40; lastpage:66; numberofpages:27; journal:GEOCHIMICA ET COSMOCHIMICA ACTA; https://hdl.handle.net/11365/1251115; https://www.sciencedirect.com/science/article/pii/S0016703723004866?pes=vor |
| DOI: | 10.1016/j.gca.2023.10.012 |
| الاتاحة: | https://hdl.handle.net/11365/1251115 https://doi.org/10.1016/j.gca.2023.10.012 https://www.sciencedirect.com/science/article/pii/S0016703723004866?pes=vor |
| Rights: | info:eu-repo/semantics/openAccess |
| رقم الانضمام: | edsbas.C33F17FE |
| قاعدة البيانات: | BASE |
| ردمك: | 9780016703720 0016703723 |
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| DOI: | 10.1016/j.gca.2023.10.012 |