August 17, 2014 Journal article Open Access

M. Schiazza; Francesco Stoppa

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{
  "DOI": "10.2478/s13533-012-0190-z", 
  "abstract": "Abstract\n               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<600 \u00b0C) is marked by the metastable reaction and formation of a rare and complex zeolite association (T<300 \u00b0C). Circulation of low-temperature (T<100 \u00b0C) 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.", 
  "author": [
    {
      "family": "M. Schiazza"
    }, 
    {
      "family": "Francesco Stoppa"
    }
  ], 
  "id": "118589", 
  "issued": {
    "date-parts": [
      [
        2014, 
        8, 
        17
      ]
    ]
  }, 
  "language": "eng", 
  "note": "", 
  "title": "Extreme chemical conditions of crystallisation of Umbrian Melilitolites and wealth of rare, late stage/hydrothermal minerals", 
  "type": "article-journal"
}