Journal article Open Access
M. Schiazza; Francesco Stoppa
{ "@context": "https://schema.org/", "@id": "https://doi.org/10.2478/s13533-012-0190-z", "@type": "ScholarlyArticle", "creator": [ { "@type": "Person", "name": "M. Schiazza" }, { "@type": "Person", "name": "Francesco Stoppa" } ], "datePublished": "2014-08-17", "description": "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.", "headline": "Extreme chemical conditions of crystallisation of Umbrian Melilitolites and wealth of rare, late stage/hydrothermal minerals", "identifier": "https://doi.org/10.2478/s13533-012-0190-z", "image": "https://zenodo.org/static/img/logos/zenodo-gradient-round.svg", "inLanguage": { "@type": "Language", "alternateName": "eng", "name": "English" }, "keywords": [ "NEANIAS Atmospheric Research Community", "General Earth and Planetary Sciences", "Environmental Science (miscellaneous)" ], "license": "https://creativecommons.org/licenses/by-nc-nd/4.0/", "name": "Extreme chemical conditions of crystallisation of Umbrian Melilitolites and wealth of rare, late stage/hydrothermal minerals", "url": "https://www.openaccessrepository.it/record/118589" }
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