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@ARTICLE{Lathe:476406,
      author       = {Lathe, Christian and Koch-Mueller, Monika and Wunder, Bernd
                      and Appelt, Oona and Bhat, Shrikant and Farla, Robert},
      title        = {{I}n situ reinvestigation of reaction phase {A} plus
                      high-pressure clinoenstatite to forsterite plus water in the
                      system {M}g{O}-{S}i{O}$_2$-{H}$_2${O} ({MSH})},
      journal      = {European journal of mineralogy},
      volume       = {34},
      number       = {2},
      issn         = {0935-1221},
      address      = {Göttingen},
      publisher    = {Copernicus Publications},
      reportid     = {PUBDB-2022-01721},
      pages        = {201 - 213},
      year         = {2022},
      abstract     = {The dehydration reaction of phase A + high P clinoenstatite
                      to forsterite + water was experimentally investigated at
                      water-saturated conditions in the pressure range between 7.0
                      and 10.0 GPa by in situ reversal runs in a multi-anvil
                      press at the synchrotron source of PETRA III in Hamburg. By
                      using closed watertight X-ray transparent Ti capsules, its
                      position is determined by reversal brackets at 8.3 GPa
                      (700–760 ∘C), 8.6 GPa (700–740 ∘C), and
                      9.8 GPa (750–800 ∘C); thus, the equilibrium of the
                      reaction corresponds ideally to the data reported by Wunder
                      (1998). Optical investigations of the quenched product
                      phases show strong grain coarsening of phase A and
                      clinoenstatite, whereas nucleated forsterite from the
                      breakdown of the aforementioned phases is very fine grained.
                      This corresponds to recent experimental observations that
                      the grain size of phases formed in hydration reactions are
                      significantly larger than those from dehydration
                      reactions.In addition, we performed three time-dependent in
                      situ experiments at 9–10 GPa and 800–870 ∘C and
                      monitored the reaction progress every 10 min to determine
                      the kinetics of the forsterite formation from phase
                      A + high P clinoenstatite. The growth of forsterite at
                      these P–T conditions, already visible after 10 min,
                      confirms the results of the bracketing experiments. However,
                      the reaction is extremely slow, and even after more than
                      3 h, significant amounts of phase A and high P
                      clinoenstatite are still present. This is in contradiction
                      to other dehydration reactions of former experimental
                      studies, e.g. the fast dehydration of serpentine, which
                      completely dehydrates within 3 h, even at much lower
                      temperatures, closely overstepping serpentine
                      stability.Despite its reaction sluggishness, which would
                      contradict the concept of earthquake initiation, the
                      observed formation of nano-sized forsterite as a dehydration
                      product may still indicate the potential of this reaction to
                      cause mechanical instabilities and, thus, seismicity within
                      cold subduction zones at depths of the Earth's mantle.
                      Additionally, at depths exceeding serpentine dehydration,
                      the phase A + high P/low P clinoenstatite breakdown to
                      forsterite + water might induce geochemical and
                      geophysical processes, including the formation of
                      low-velocity zones within the overlying mantle wedge from
                      the large amounts of fluid liberated by this water line
                      reaction. After the breakdown of antigorite, the assemblage
                      phase A + clinoenstatite might act as a bridge to
                      transport water to larger depths during cold subduction,
                      followed by the formation of other hydrous high P phases.},
      cin          = {DOOR ; HAS-User / FS-PETRA-D / GFZ},
      ddc          = {550},
      cid          = {I:(DE-H253)HAS-User-20120731 /
                      I:(DE-H253)FS-PETRA-D-20210408 / I:(DE-H253)GFZ-20120731},
      pnm          = {631 - Matter – Dynamics, Mechanisms and Control
                      (POF4-631) / 6G3 - PETRA III (DESY) (POF4-6G3) /
                      FS-Proposal: I-20210162 (I-20210162)},
      pid          = {G:(DE-HGF)POF4-631 / G:(DE-HGF)POF4-6G3 /
                      G:(DE-H253)I-20210162},
      experiment   = {EXP:(DE-H253)P-P61.2-20150101},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000776254100001},
      doi          = {10.5194/ejm-34-201-2022},
      url          = {https://bib-pubdb1.desy.de/record/476406},
}