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Volume 32 Issue 6
Dec 2021
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Botao Li, Hans-Joachim Massonne, Xiaoping Yuan. Pressure-Temperature Evolution of a Mylonitic Gneiss from the Lower Seve Nappe in the Handöl Area, Central Sweden. Journal of Earth Science, 2021, 32(6): 1496-1511. doi: 10.1007/s12583-021-1413-3
Citation: Botao Li, Hans-Joachim Massonne, Xiaoping Yuan. Pressure-Temperature Evolution of a Mylonitic Gneiss from the Lower Seve Nappe in the Handöl Area, Central Sweden. Journal of Earth Science, 2021, 32(6): 1496-1511. doi: 10.1007/s12583-021-1413-3

Pressure-Temperature Evolution of a Mylonitic Gneiss from the Lower Seve Nappe in the Handöl Area, Central Sweden

doi: 10.1007/s12583-021-1413-3
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  • Corresponding author: Botao Li, libotao123@hotmail.com
  • Received Date: 21 Nov 2020
  • Accepted Date: 14 Jan 2021
  • Publish Date: 30 Dec 2021
  • Ultrahigh-pressure metamorphism has recently been reported from various crustal rocks in the Seve Nappe Complex (SNC) in which microdiamonds were found. However, in gneiss from the Lower Seve Nappe (LSN), neither any direct petrographic indication for UHP was reported nor the metamorphic evolution was well constrained. We studied a mylonitic gneiss from the Handöl area of the LSN and applied phase-diagram modeling and Ti-in-biotite thermometry. Based on the compositions of garnet and biotite and observed mineral assemblages, a path was reconstructed passing through about 8 kbar and 730℃ at prograde metamorphism. Peak-pressure and initial retrograde stages occurred at 9.0-10.2 kbar at 745-775℃, and 7-9 kbar at < 750℃, respectively. No ultrahigh-pressure evidence was recognized compatible with medium-pressure metamorphism deduced in earlier studies of gneiss from the SNC. As higher peak pressures were reported recently for metamorphic rocks of the LSN, a possible interpretation is that slices or erased blocks were subducted, metamorphosed at different depths, and exhumed in a subduction channel. However, the dominant gneiss of the SNC experienced only a medium-pressure metamorphism in the upper part of the downgoing Baltica Plate. Rocks from different depth levels were brought together in an exhumation channel located between Baltica and the overlying plate.

     

  • Electronic Supplementary Materials: Supplementary materials containing Figs. S1 and S2 are available in the online version of this article at https://doi.org/10.1007/s12583-021-1413-3.
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