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<datestamp>2018-01-11</datestamp>
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<publisher>HAL CCSD</publisher>
<title lang=en>La, Ce, Nd, and Sr behavior in minette magmas during crystallization of apatite-clinopyroxene-mica paragenesis at upper-mantle conditions</title>
<creator>Cid, J. P.</creator>
<creator>Nardi, L. V. S.</creator>
<creator>Campos, C. S.</creator>
<creator>Gisbert, P. E.</creator>
<creator>Merlet, Claude</creator>
<creator>Conceicao, H.</creator>
<creator>Boyer, Bernard</creator>
<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>
<source>ISSN: 0935-1221</source>
<source>European Journal of Mineralogy</source>
<publisher>E Schweizerbart Science Publishers</publisher>
<identifier>hal-00407602</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00407602</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00407602</source>
<source>European Journal of Mineralogy, E Schweizerbart Science Publishers, 2007, 19 (1), pp.39-50. 〈10.1127/0935-1221/2007/0019-0039〉</source>
<identifier>DOI : 10.1127/0935-1221/2007/0019-0039</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1127/0935-1221/2007/0019-0039</relation>
<language>en</language>
<subject lang=fr>apatite</subject>
<subject lang=fr>clinopyroxene</subject>
<subject lang=fr>SIMS</subject>
<subject lang=fr>EPMA</subject>
<subject lang=fr>partition coefficients</subject>
<subject>[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>Mafic microgranular enclaves produced by co-mingling between minette and syenite magmas are found in the Piquiri Syenite, southern Brazil. These enclaves were crystallized under upper mantle conditions. K-clinopyroxene and pyrope are among the early-crystallized phases, suggesting an initial pressure around 5GPa. The mineralogy of minettes comprises phenocrysts of magnesium biotite and diopside, occasionally apatite, in a groundmass formed by these minerals plus alkali feldspar. Two types of apatites are observed: (i) euhedral grains, as inclusions or groundmass constituents, and (ii) aciculate crystals formed during undercooling of mafic magma. Substitutional schemes suggested for these apatites are Si ⇆ P in the tetrahedral site, and Sr and LREE replacing Ca. La, Ce, Nd, and Sr concentrations reveal that these elements are extremely enriched in apatite. Partition coefficients between early-crystallized apatites and estimated melt compositions are DLa (11.8 - 30.6), DCe (16.1-33), DNd (12-31) and DSr (5.1-8.2). Apatite concentrates the LREE up to 200 times compared to clinopyroxene, even higher values were determined for ap/mica partitioning. The ap/cpx and ap/mica partition coefficients for undercooled minerals are close to the values determined for the near-liquidus phases, which indicates constant behavior of LREE and Sr between apatite-clinopyroxene-mica parageneses and minette liquids. Furthermore, these partitioning data preclude any chemical diffusion of these elements between minette and syenite magmas during co-mingling.</description>
<date>2007</date>
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