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<publisher>HAL CCSD</publisher>
<title lang=en>Near-liquidus growth of feldspar spherulites in trachytic melts: 3D morphologies and implications in crystallization mechanisms</title>
<creator>Arzilli, Fabio</creator>
<creator>Mancini, Lucia</creator>
<creator>Voltolini, Marco</creator>
<creator>Cicconi, Maria Rita</creator>
<creator>Mohammadi, Sara</creator>
<creator>Giuli, Gabriele</creator>
<creator>MAINPRICE, David</creator>
<creator>Paris, Eleonora</creator>
<creator>BAROU, Fabrice</creator>
<creator>Carroll, Michael R.</creator>
<contributor>Elettra-Sincrotrone Trieste</contributor>
<contributor>Lawrence Berkeley National Laboratory [Berkeley] (LBNL)</contributor>
<contributor>School of Science and Technology — Geology Division, University of Camerino</contributor>
<contributor>Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Manteau et Interfaces ; Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS) - Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<description>International audience</description>
<source>ISSN: 0024-4937</source>
<source>Lithos</source>
<publisher>Elsevier</publisher>
<identifier>hal-01172356</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-01172356</identifier>
<source>https://hal.archives-ouvertes.fr/hal-01172356</source>
<source>Lithos, Elsevier, 2015, 216, pp.93-105. 〈10.1016/j.lithos.2014.12.003〉</source>
<identifier>DOI : 10.1016/j.lithos.2014.12.003</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1016/j.lithos.2014.12.003</relation>
<language>en</language>
<subject lang=en>Spherulite</subject>
<subject lang=en>Alkali feldspar</subject>
<subject lang=en>Crystallization</subject>
<subject lang=en>Phase-contrast X-ray microtomography</subject>
<subject lang=en>Phase-retrieval processing</subject>
<subject lang=en>Electron backscatter diffraction</subject>
<subject>[SDU.STU.PE] Sciences of the Universe [physics]/Earth Sciences/Petrography</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>The nucleation and growth processes of spherulitic alkali feldspar have been investigated in this study through X-ray microtomography and electron backscatter diffraction (EBSD) data. Here we present the first data on Shape Preferred Orientation (SPO) and Crystal Preferred Orientation (CPO) of alkali feldspar within spherulites. The analysis of synchrotron X-ray microtomography and EBSD datasets allowed us to study the morphometric characteristics of spherulites in trachytic melts in quantitative fashion, highlighting the three-dimensional shape, preferred orientation, branching of lamellae and crystal twinning, providing insights about the nucleation mechanism involved in the crystallization of the spherulites. The nucleation starts with a heterogeneous nucleus (pre-existing crystal or bubble) and subsequently it evolves forming “bow tie” morphologies, reaching radially spherulitic shapes in few hours. Since each lamella within spherulite is also twinned, these synthetic spherulites cannot be considered as single nuclei but crystal aggregates originated by heterogeneous nucleation. A twin boundary may have a lower energy than general crystal–crystal boundaries and many of the twinned grains show evidence of strong local bending which, combined with twin plane, creates local sites for heterogeneous nucleation.This study shows that the growth rates of the lamellae (10− 6–10− 7 cm/s) in spherulites are either similar or slightly higher than that for single crystals by up to one order of magnitude. Furthermore, the highest volumetric growth rates (10− 11–10− 12 cm3/s) show that the alkali feldspar within spherulites can grow fast reaching a volumetric size of ~ 10 μm3 in 1 s.</description>
<date>2015-02</date>
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