Origem da escapolite em agregados poligonais com plagioclase; discussão baseada na definição de anomalias químicas e de vectores de substituição iónica  [The origin of scapolite in polygonal assemblages with plagioclase; a discussion based on the definition of chemical anomalies and vectors of ionic substitution]

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Alternate Title:The origin of scapolite in polygonal assemblages with plagioclase; a discussion based on the definition of chemical anomalies and vectors of ionic substitution
Authors:Borges, F. Sodré
Volume Title:Comunicacoes dos Servicos Geologicos de Portugal
Source:Comunicacoes dos Servicos Geologicos de Portugal, Vol.66, p.59-66. Publisher: Servicos Geologicos de Portugal, Lisbon, Portugal. ISSN: 0037-2730
Publication Date:1980
Note:In Portuguese with English summary. Presented at the I Encontro de geociencias, Lisbon, December 1979. 15 refs.; illus. incl. 22 anal., 1 table
Summary:The origin of scapolite in a polygonal scapolite-plagioclase assemblage is discussed on the grounds of the stoichiometry exhibited by samples from Roneval complex (South Harris, Outer Hebrides, Scotland). It is concluded that the polygonal scapolite grains are single-crystal pseudomorphs after recrystallized plagioclase grains, and developed during a metasomatic episode in which the plagioclase was enriched in Si and Na, gained Cl and C, and lost Al and Ca. [L.A.B.]
Subjects:Anorthosite; Feldspar group; Framework silicates; Genesis; Igneous rocks; Materials; Metasomatism; Minerals; Occurrence; Petrology; Plagioclase; Plutonic rocks; Pseudomorphism; Scapolite group; Silicates; Europe; Great Britain; Hebrides; Outer Hebrides; Scotland; United Kingdom; Western Europe; Harris Island; Roneval Complex
Coordinates:N574000 N580000 W0064000 W0072000
Abstract Numbers:82M/4574
Record ID:1983045338
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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