Trace-element incorporation in titanite: constraints from experimentally determined solid/liquid partition coefficients. (Articolo in rivista)

Type
Label
  • Trace-element incorporation in titanite: constraints from experimentally determined solid/liquid partition coefficients. (Articolo in rivista) (literal)
Anno
  • 2002-01-01T00:00:00+01:00 (literal)
Alternative label
  • TIEPOLO M.; OBERTI R.; VANNUCCI R. (2002)
    Trace-element incorporation in titanite: constraints from experimentally determined solid/liquid partition coefficients.
    in Chemical geology
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • TIEPOLO M.; OBERTI R.; VANNUCCI R. (literal)
Pagina inizio
  • 103 (literal)
Pagina fine
  • 117 (literal)
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  • This work that focuses on the trace element partitioning between titanite and melt furnish the first dataset of S/LD comprising most of the petrologically relevant elements. The importance of this work comes from the scarce knowledge on the trace element distribution in titanite and the increasing interest paid to accessory phases for the interpretation of petrological processes. Trace element partition coefficients have been experimentally determined on synthetic crystal in equilibrium with silicate melts and trace element in both titanite and glass were measured using laser ablation ICP-MS. Coupling structural and partitioning information the major mechanisms of incorporation (site distribution and charge balance mechanisms) for trace elements have been unravelled. This is fundamental for the application of results to natural system and for the achievement of realistic data from petrological modelling. This work is retained very helpful in modelling magma and crust evolution. (literal)
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  • 191 (literal)
Rivista
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  • Impact Factor 2,437 (literal)
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  • Titanite/liquid partition coefficients for most of the trace elements relevant in petrogenetic studies are provided for titanitesaturated liquids equilibrated at 1.5 GPa and 850 °C starting from lamproitic compositions. The high compatibility observed for REE, HFSE, Sr, V and Sc, and the strong incompatibility observed for actinides, large ion lithophile and light elements are discussed in terms of available crystal-chemical mechanisms for incorporation and crystal-structure control. The exchange vectors Na+1Ca-1 and Al+1Ti-1 allow local charge balance to be achieved after incorporation of REE3+ and R5+ at the Ca and Ti site, respectively. The significant amounts of H measured are also relevant in this regard [the exchange mechanism being (OH)+1O-1 at the O1 site]. The incorporation of U4+ and Th4+ at the Ca site is scarce, and is likely balanced by that of Mg2+ at the Ti site; both these substitutions are responsible for strong structural strain. Titanite can thus be considered an important repository for REE and HFSE in metamorphic and igneous rocks, and its role must be accounted for when modelling trace-element residence during metamorphic reactions and late magmatic crystallisation history. Due to the measured differences in compatibility, titanite crystallisation increases the values of Nb/Ta and LREE/HREE ratios in residual liquids. The similar compatibility of U and Pb makes titanite suitable for U–Pb geochronology of igneous rocks only after common Pb correction. (literal)
Note
  • ISI Web of Science (WOS) (literal)
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  • M. Tiepolo a), R. Oberti a), R. Vannucci a,b). a) C.N.R.-IGG-Sezione di Pavia, via Ferrata 1, I-27100 Pavia, b) Dipartimento di Scienze della Terra, Università di Pavia, via Ferrata 1, I-27100 Pavia. (literal)
Titolo
  • Trace-element incorporation in titanite: constraints from experimentally determined solid/liquid partition coefficients. (literal)
Abstract
  • Titanite/liquid partition coefficients for most of the trace elements relevant in petrogenetic studies are provided for titanitesaturated liquids equilibrated at 1.5 GPa and 850 °C starting from lamproitic compositions. The high compatibility observed for REE, HFSE, Sr, V and Sc, and the strong incompatibility observed for actinides, large ion lithophile and light elements are discussed in terms of available crystal-chemical mechanisms for incorporation and crystal-structure control. The exchange vectors Na+1Ca-1 and Al+1Ti-1 allow local charge balance to be achieved after incorporation of REE3+ and R5+ at the Ca and Ti site, respectively. The significant amounts of H measured are also relevant in this regard [the exchange mechanism being (OH)+1O-1 at the O1 site]. The incorporation of U4+ and Th4+ at the Ca site is scarce, and is likely balanced by that of Mg2+ at the Ti site; both these substitutions are responsible for strong structural strain. Titanite can thus be considered an important repository for REE and HFSE in metamorphic and igneous rocks, and its role must be accounted for when modelling trace-element residence during metamorphic reactions and late magmatic crystallisation history. Due to the measured differences in compatibility, titanite crystallisation increases the values of Nb/Ta and LREE/HREE ratios in residual liquids. The similar compatibility of U and Pb makes titanite suitable for U–Pb geochronology of igneous rocks only after common Pb correction. (literal)
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