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  Redistribution of HFSE elements during rutile replacement by titanite

Lucassen, F., Dulski, P., Abart, R., Franz, G., Rhede, D., Romer, R. L. (2010): Redistribution of HFSE elements during rutile replacement by titanite. - Contributions to Mineralogy and Petrology, 160, 2, 279-295.
https://doi.org/10.1007/s00410-009-0477-3

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Datensatz-Permalink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_241002 Versions-Permalink: -
Genre: Zeitschriftenartikel

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 Urheber:
Lucassen, Friedrich1, Autor              
Dulski, Peter2, Autor              
Abart, R.3, Autor
Franz, G.3, Autor
Rhede, Dieter1, Autor              
Romer, R. L.1, Autor              
Affiliations:
14.2 Inorganic and Isotope Geochemistry, 4.0 Chemistry and Material Cycles, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146040              
25.2 Climate Dynamics and Landscape Evolution, 5.0 Earth Surface Processes, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum, ou_146046              
3External Organizations, ou_persistent22              

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Schlagwörter: Rutile; Titanite; Metamorphic reaction; HFSE distribution; Nb, Zr diffusion in rutile
 DDC: 550 - Earth sciences
 Zusammenfassung: Titanite growth at the expense of rutile during retrograde hydration of eclogite into amphibolite is a common phenomenon. We investigated an amphibolite sample from the Tromso eclogite facies terrain in Northern Norway to gain insight into the trace element distribution between rutile and titanite during incomplete resorption of the rutile by titanite. Patchy compositional zoning of Al, Ti, and F in titanite relates to the presence of a fluid with variable Ti/Al and/or F during its growth. Laser ablation ICP-MS and electron microprobe data for high field strength elements (HFSE: Nb, Zr, Ta, and Hf) of rutile resorbed by titanite indicate a pronounced enrichment of these elements in the rim of a large single rutile crystal (similar to 8 mm) and a systematic decrease towards uniform HFSE contents in the large core. HFSE contents of smaller rutile grains (similar to 0.5 mm) and rutile inclusions (< 100 mu m) in the titanite overgrowth are similar or higher than in the rims of large rutile crystals. Element profiles from the rim inward demonstrate that HFSE enrichment in rutile is controlled by diffusion. HFSE ratios in diffusion-altered rutile show systematic variations compared with the uniform core composition of the large rutile. Modelling of Zr and Nb diffusion in rutile indicates that diffusion coefficients in rutile in fluid-dominated natural systems must be considerably higher than those determined experimentally at 1 bar in dry systems. Variations of HFSE contents in the newly formed titanite show no systematic spatial distribution. HFSE ratios in titanite and the rims of rutile are different, indicating different solid/fluid distribution coefficients in these minerals. Element fractionation by diffusion into the relict rutile and during fluid-mediated growth of new titanite could substantially change the HFSE budget of these minerals and could affect their use for geochemical tracing and other applications, such as Zr-based geothermobarometry.

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 Datum: 2010
 Publikationsstatus: Final veröffentlicht
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 Ort, Verlag, Ausgabe: -
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 Art der Begutachtung: -
 Identifikatoren: eDoc: 15298
GFZPOF: PT2 Earth System Dynamics: Coupled Processes and Regional Impact
DOI: 10.1007/s00410-009-0477-3
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Titel: Contributions to Mineralogy and Petrology
Genre der Quelle: Zeitschrift, SCI, Scopus
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Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 160 (2) Artikelnummer: - Start- / Endseite: 279 - 295 Identifikator: CoNE: https://gfzpublic.gfz-potsdam.de/cone/journals/resource/journals90