Extreme chemical conditions of crystallisation of Umbrian Melilitolites and wealth of rare, late stage/hydrothermal minerals
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...
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ftopenaccessrep:oai:zenodo.org:118589 2023-10-29T02:37:41+01:00 Extreme chemical conditions of crystallisation of Umbrian Melilitolites and wealth of rare, late stage/hydrothermal minerals M. Schiazza Francesco Stoppa 2014-08-17 https://www.openaccessrepository.it/record/118589 https://doi.org/10.2478/s13533-012-0190-z eng eng url:https://www.openaccessrepository.it/communities/itmirror https://www.openaccessrepository.it/record/118589 doi:10.2478/s13533-012-0190-z info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-nd/4.0/ NEANIAS Atmospheric Research Community General Earth and Planetary Sciences Environmental Science (miscellaneous) info:eu-repo/semantics/article publication-article 2014 ftopenaccessrep https://doi.org/10.2478/s13533-012-0190-z 2023-10-03T22:20:24Z 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<600 °C) is marked by the metastable reaction and formation of a rare and complex zeolite association (T<300 °C). Circulation of low-temperature (T<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. Article in Journal/Newspaper kola peninsula Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository Open Geosciences 6 4 549 564 |
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Open Polar |
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Istituto Nazionale di Fisica Nucleare (INFN): Open Access Repository |
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ftopenaccessrep |
language |
English |
topic |
NEANIAS Atmospheric Research Community General Earth and Planetary Sciences Environmental Science (miscellaneous) |
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NEANIAS Atmospheric Research Community General Earth and Planetary Sciences Environmental Science (miscellaneous) M. Schiazza Francesco Stoppa Extreme chemical conditions of crystallisation of Umbrian Melilitolites and wealth of rare, late stage/hydrothermal minerals |
topic_facet |
NEANIAS Atmospheric Research Community General Earth and Planetary Sciences Environmental Science (miscellaneous) |
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<600 °C) is marked by the metastable reaction and formation of a rare and complex zeolite association (T<300 °C). Circulation of low-temperature (T<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. |
format |
Article in Journal/Newspaper |
author |
M. Schiazza Francesco Stoppa |
author_facet |
M. Schiazza Francesco Stoppa |
author_sort |
M. Schiazza |
title |
Extreme chemical conditions of crystallisation of Umbrian Melilitolites and wealth of rare, late stage/hydrothermal minerals |
title_short |
Extreme chemical conditions of crystallisation of Umbrian Melilitolites and wealth of rare, late stage/hydrothermal minerals |
title_full |
Extreme chemical conditions of crystallisation of Umbrian Melilitolites and wealth of rare, late stage/hydrothermal minerals |
title_fullStr |
Extreme chemical conditions of crystallisation of Umbrian Melilitolites and wealth of rare, late stage/hydrothermal minerals |
title_full_unstemmed |
Extreme chemical conditions of crystallisation of Umbrian Melilitolites and wealth of rare, late stage/hydrothermal minerals |
title_sort |
extreme chemical conditions of crystallisation of umbrian melilitolites and wealth of rare, late stage/hydrothermal minerals |
publishDate |
2014 |
url |
https://www.openaccessrepository.it/record/118589 https://doi.org/10.2478/s13533-012-0190-z |
genre |
kola peninsula |
genre_facet |
kola peninsula |
op_relation |
url:https://www.openaccessrepository.it/communities/itmirror https://www.openaccessrepository.it/record/118589 doi:10.2478/s13533-012-0190-z |
op_rights |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-nd/4.0/ |
op_doi |
https://doi.org/10.2478/s13533-012-0190-z |
container_title |
Open Geosciences |
container_volume |
6 |
container_issue |
4 |
container_start_page |
549 |
op_container_end_page |
564 |
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1781062711493263360 |