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Dostęp zamkniętyBehaviour of ThSiO4 during hydrothermal alteration of rare-metal rich lithologies from peralkaline rocks
| dc.abstract.en | The behaviour of ThSiO4 during low-temperature alteration has significance for element mobility and redistribution. Here we describe five types of alteration of ThSiO4 by hydrothermal fluids: (1) primary ThSiO4 associated with chevkinite-(Ce) in a quartz-epidote metasomatite; (2) during alteration of monazite-(Ce) in a quartzolite; (3) during alteration of fergusonite-(Y) in a quartz-epidote metasomatite; (4) following exsolution from chevkinite-(Ce); and (5) associated with cerite-(Ce) and with ilmenite and bastnäsite-(Ce) in late-stage veinlets in a syenitic pegmatite and a metasomatite. The great majority of crystals have been strongly altered compositionally, with variable degrees of replacement of formula elements by non-formula elements, such as Ca, Fe, P and REE. The most reliable geochemical indicators of hydrothermal alteration are low analytical totals and non-stoichiometric structural formulae. The alteration is variably ascribed to dissolution-reprecipitation and pervasive fluid infiltration along cracks. Thorium appears to have shown limited mobility in these samples. |
| dc.affiliation | Uniwersytet Warszawski |
| dc.contributor.author | Macdonald, Ray |
| dc.contributor.author | Bagiński, Bogusław |
| dc.contributor.author | Kartashov, P. M. |
| dc.contributor.author | Zozulya, D. |
| dc.date.accessioned | 2024-01-24T18:33:41Z |
| dc.date.available | 2024-01-24T18:33:41Z |
| dc.date.issued | 2017 |
| dc.description.finance | Nie dotyczy |
| dc.description.number | 4 |
| dc.description.volume | 81 |
| dc.identifier.doi | 10.1180/MINMAG.2016.080.138 |
| dc.identifier.issn | 0026-461X |
| dc.identifier.uri | https://repozytorium.uw.edu.pl//handle/item/102082 |
| dc.language | eng |
| dc.pbn.affiliation | earth and related environmental sciences |
| dc.relation.ispartof | Mineralogical Magazine |
| dc.relation.pages | 873-893 |
| dc.rights | ClosedAccess |
| dc.sciencecloud | nosend |
| dc.title | Behaviour of ThSiO4 during hydrothermal alteration of rare-metal rich lithologies from peralkaline rocks |
| dc.type | JournalArticle |
| dspace.entity.type | Publication |