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    Metamorphic rates in collisional orogeny from in situ allanite and monazite dating

    Access Status
    Fulltext not available
    Authors
    Janots, E.
    Engi, M.
    Rubatto, D.
    Berger, A.
    Gregory, Courtney
    Rahn, M.
    Date
    2009
    Type
    Journal Article
    
    Metadata
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    Citation
    Janots, E. and Engi, M. and Rubatto, D. and Berger, A. and Gregory, C. and Rahn, M. 2009. Metamorphic rates in collisional orogeny from in situ allanite and monazite dating. Geology. 37: pp. 11-14.
    Source Title
    Geology
    ISSN
    00917613
    URI
    http://hdl.handle.net/20.500.11937/22329
    Collection
    • Curtin Research Publications
    Abstract

    The prograde sequence of rare earth minerals recorded in metapelites during regional metamorphism reveals a series of irreversible reactions among silicates and phosphates. In individual samples from the northern Lepontine (Central Alps), allanite is partly replaced by monazite at 560–580 °C. Relic allanite retains its characteristic growth zoning acquired at greenschist facies conditions (430–450 °C). Coexisting monazite and allanite were dated in situ to delimit in time successive stages of the Barrovian metamorphism. In situ sensitive high-resolution ion microprobe (SHRIMP) U-Th-Pb dating of allanite (31.5 ± 1.3 and 29.2 ± 1.0 Ma) and monazite (18.0 ± 0.3 and 19.1 ± 0.3 Ma) constrains the time elapsed between 430–450 °C and 560–580 °C, which implies an average heating rate of 8–15 °C/m.y. Combined with new fi ssion track ages (zircon, 10–9 Ma; apatite, 7.5–6.5 Ma), metamorphic rates of theentire orogenic cycle, from prograde to final cooling, can be reconstructed.

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