August 17, 2014 Journal article Open Access

M. Schiazza; Francesco Stoppa

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  <identifier identifierType="URL">https://www.openaccessrepository.it/record/118589</identifier>
  <creators>
    <creator>
      <creatorName>M. Schiazza</creatorName>
    </creator>
    <creator>
      <creatorName>Francesco Stoppa</creatorName>
    </creator>
  </creators>
  <titles>
    <title>Extreme chemical conditions of crystallisation of Umbrian Melilitolites and wealth of rare, late stage/hydrothermal minerals</title>
  </titles>
  <publisher>INFN Open Access Repository</publisher>
  <publicationYear>2014</publicationYear>
  <subjects>
    <subject>NEANIAS Atmospheric Research Community</subject>
    <subject>General Earth and Planetary Sciences</subject>
    <subject>Environmental Science (miscellaneous)</subject>
  </subjects>
  <dates>
    <date dateType="Issued">2014-08-17</date>
  </dates>
  <language>en</language>
  <resourceType resourceTypeGeneral="Text">Journal article</resourceType>
  <alternateIdentifiers>
    <alternateIdentifier alternateIdentifierType="url">https://www.openaccessrepository.it/record/118589</alternateIdentifier>
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  <relatedIdentifiers>
    <relatedIdentifier relatedIdentifierType="DOI" relationType="IsIdenticalTo">10.2478/s13533-012-0190-z</relatedIdentifier>
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  <rightsList>
    <rights rightsURI="https://creativecommons.org/licenses/by-nc-nd/4.0/">Creative Commons Attribution-NonCommercial-NoDerivatives</rights>
    <rights rightsURI="info:eu-repo/semantics/openAccess">Open Access</rights>
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  <descriptions>
    <description descriptionType="Abstract">Abstract
               Melilitolites of the Umbria Latium Ultra-alkaline District display a complete crystallisation sequence of peculiar, late-stage mineral phases and hydrothermal/cement minerals, analogous to fractionated mineral associations from the Kola Peninsula. This paper summarises 20 years of research which has resulted in the identification of a large number of mineral species, some very rare or completely new and some not yet classified. The progressive increasing alkalinity of the residual liquid allowed the formation of Zr-Ti phases and further delhayelitemacdonaldite mineral crystallisation in the groundmass. The presence of leucite and kalsilite in the igneous assemblage is unusual and gives a kamafugitic nature to the rocks. Passage to non-igneous temperatures (T&amp;lt;600 °C) is marked by the metastable reaction and formation of a rare and complex zeolite association (T&amp;lt;300 °C). Circulation of low-temperature (T&amp;lt;100 °C) K-Ca-Ba-CO2-SO2-fluids led to the precipitation of sulphates and hydrated and/or hydroxylated silicate-sulphate-carbonates. As a whole, this mineral assemblage can be considered typical of ultra-alkaline carbonatitic rocks.</description>
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