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<datestamp>2018-01-11</datestamp>
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<publisher>HAL CCSD</publisher>
<title lang=en>Redistribution of REE, Y, Th, and U at high pressure: Allanite-forming reactions in impure meta-quartzites (Sesia Zone, Western Italian Alps)</title>
<creator>Regis, Daniele</creator>
<creator>Cenki-Tok, Bénédicte</creator>
<creator>Darling, James</creator>
<creator>Engi, Martin</creator>
<contributor>Institut für Geologie, Bern ; Université du Québec</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>
<description>International audience</description>
<source>ISSN: 0003-004X</source>
<source>American Mineralogist</source>
<publisher>Mineralogical Society of America</publisher>
<identifier>hal-00745674</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00745674</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00745674</source>
<source>American Mineralogist, Mineralogical Society of America, 2012, 97 (2-3), pp.315-328. 〈10.2138/am.2012.3832〉</source>
<identifier>DOI : 10.2138/am.2012.3832</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.2138/am.2012.3832</relation>
<language>en</language>
<subject lang=en>Allanite</subject>
<subject lang=en>HP metamorphism</subject>
<subject lang=en>REE relations</subject>
<subject lang=en>REE partitioning</subject>
<subject lang=en>reaction sequence</subject>
<subject>[SDU.STU.MI] Sciences of the Universe [physics]/Earth Sciences/Mineralogy</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Accessory phases are important hosts of trace elements; allanite may contain >90% of the REE in a bulk rock. The mobility and redistribution of several trace elements, notably HREE, Th, U, and Y is thus controlled by reactions involving allanite and other REE phases, as well as several rock-forming minerals. As these elements are commonly concentrated in mature elastic sediments, a suite of impure quartzite was studied. Two eclogite facies samples from the Monometamorphic Cover Complex of the Sesia Zone (Western Italian Alps) are presented in some detail, as they reveal a remarkably rich spectrum of reaction relationships that involve REE phases.;Two allanite-forming reactions were inferred from textures and phase compositions;(1) monazite + Ca-silicate(?) + fluid -> allanite + apatite + thorite;;(2) monazite + thorite + Ca-silicate(?) + fluid -> Th-rich allanite + auerlite +/- apatite.;Petrographic observations and thermodynamic models suggest that allanite entered the HP assemblage at similar to 530 degrees C and 17-18 kbar during prograde metamorphism.;In one sample, allanite is rimmed by epidote rich in Y and HREE that grew at the expense of xenotime. Two net transfer reactions were derived;(3) xenotime + allanite + fluid -> Y-rich epidote + apatite + thorite;;(4) xenotime + allanite + fluid -> Y-rich epidote + aeschynite + thorite + (phosphate?).;Textural relationships and trace element analyses of coexisting allanite/monazite and xenotime/Y-rich epidote reveal systematic partitioning of the REE. Partition coefficients for the HREE are compatible with equilibrium fractionation, whereas those for the LREE show patterns that seem to be inherited from the precursor phases, in this case zircon with variable LREE composition.</description>
<date>2012</date>
</dc>
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