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Stability of monazite and disturbance of the Th-U-Pb system under experimental conditions of 250-350^{\circ}C and 200-400 MPa

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Stability of monazite and disturbance of the Th-U-Pb system under experimental conditions of 250-350^{\circ}C and 200-400 MPa

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dc.contributor.author Budzyń, Bartosz [SAP13037090] pl
dc.contributor.author Konečný, Patrik pl
dc.contributor.author Kozub-Budzyń, Gabriela A. pl
dc.date.accessioned 2015-07-27T13:46:43Z
dc.date.available 2015-07-27T13:46:43Z
dc.date.issued 2015 pl
dc.identifier.issn 0208-9068 pl
dc.identifier.uri http://ruj.uj.edu.pl/xmlui/handle/item/14086
dc.language eng pl
dc.rights Udzielam licencji. Uznanie autorstwa - Użycie niekomercyjne - Na tych samych warunkach 4.0 Międzynarodowa *
dc.rights.uri http://creativecommons.org/licenses/by-nc-sa/4.0/pl/legalcode *
dc.title Stability of monazite and disturbance of the Th-U-Pb system under experimental conditions of 250-350^{\circ}C and 200-400 MPa pl
dc.type JournalArticle pl
dc.description.physical 405-424 pl
dc.description.additional Bibliogr. s. 417-419. W wersji drukowanej artykuł na stronach: 405-425. pl
dc.abstract.en This experimental study provides important data filling the gap in our knowledge on monazite stability under conditions of fluid-mediated low-temperature metamorphic alteration and post-magmatic hydrothermal alterations. The stability of monazite and maintenance of original Th-U-total Pb ages were tested experimentally under P-T conditions of 250-350 ^{\circ}C and 200-400 MPa over 20-40 days. The starting materials included the Burnet monazite + K-feldspar ± albite ± labradorite + muscovite + biotite + SiO_2 + CaF_2 and 2M Ca(OH)_2 or Na_2Si_2O_5 + H_2O fluid. In the runs with 2M Ca(OH)_2, monazite was unaltered. REE-enriched apatite formed at 350 ^{\circ}C and 400 MPa. The presence of the Na_2Si_2O_5 + H_2O fluid promoted the strong alteration of monazite, the formation of secondary REE-enriched apatite to fluorcalciobritholite, and the formation of REE-rich steacyite. Monazite alteration included the newly developed porosity, patchy zoning, and partial replacement by REE-rich steacyite. The unaltered domains of monazite maintained the composition of the Burnet monazite and its age of (or close to) ca. 1072 Ma, while the altered domains showed random dates in the intervals of 375-771 Ma (250 ^{\circ}C, 200 MPa run), 82-253 Ma (350 ^{\circ}C, 200 MPa), and 95-635 Ma (350 ^{\circ}C, 400 MPa). The compositional alteration and disturbance of the Th-U-Pb system resulted from fluid-mediated coupled dissolution-reprecipitation. In nature, such age disturbance in monazite can be attributed to post-magmatic alteration in granitic rocks or to metasomatic alteration during metamorphism. Recognition of potentially altered domains (dark patches in high-contrast BSE-imaging, developed porosity or inclusions of secondary minerals) is crucial to the application of Th-U-Pb geochronology. pl
dc.subject.en Monazite pl
dc.subject.en apatite pl
dc.subject.en steacyite pl
dc.subject.en rare earth elements pl
dc.subject.en geochronology pl
dc.subject.en experimental petrology pl
dc.description.volume 85 pl
dc.description.number 2 pl
dc.identifier.doi 10.14241/asgp.2015.016 pl
dc.identifier.eissn 2300-8512 pl
dc.title.journal Annales Societatis Geologorum Poloniae pl
dc.language.container eng pl
dc.affiliation Wydział Biologii i Nauk o Ziemi : Instytut Nauk Geologicznych pl
dc.subtype Article pl
dc.rights.original OTHER; otwarte czasopismo; ostateczna wersja wydawcy; w momencie opublikowania; 0; pl
dc.identifier.project ROD UJ / P pl
.pointsMNiSW [2015 A]: 15


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Udzielam licencji. Uznanie autorstwa - Użycie niekomercyjne - Na tych samych warunkach 4.0 Międzynarodowa Except where otherwise noted, this item's license is described as Udzielam licencji. Uznanie autorstwa - Użycie niekomercyjne - Na tych samych warunkach 4.0 Międzynarodowa