August 17, 2014 Journal article Open Access

M. Schiazza; Francesco Stoppa

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  <dc:creator>M. Schiazza</dc:creator>
  <dc:creator>Francesco Stoppa</dc:creator>
  <dc:date>2014-08-17</dc:date>
  <dc:description>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&lt;600 °C) is marked by the metastable reaction and formation of a rare and complex zeolite association (T&lt;300 °C). Circulation of low-temperature (T&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.</dc:description>
  <dc:identifier>https://www.openaccessrepository.it/record/118589</dc:identifier>
  <dc:identifier>10.2478/s13533-012-0190-z</dc:identifier>
  <dc:language>eng</dc:language>
  <dc:relation>url:https://www.openaccessrepository.it/communities/itmirror</dc:relation>
  <dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
  <dc:rights>https://creativecommons.org/licenses/by-nc-nd/4.0/</dc:rights>
  <dc:subject>NEANIAS Atmospheric Research Community</dc:subject>
  <dc:subject>General Earth and Planetary Sciences</dc:subject>
  <dc:subject>Environmental Science (miscellaneous)</dc:subject>
  <dc:title>Extreme chemical conditions of crystallisation of Umbrian Melilitolites and wealth of rare, late stage/hydrothermal minerals</dc:title>
  <dc:type>info:eu-repo/semantics/article</dc:type>
  <dc:type>publication-article</dc:type>
</oai_dc:dc>