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Exploring microstructures in lower mantle mineral assemblages with synchrotron x-rays

Journal Article · · Science Advances
 [1];  [2];  [3];  [4];  [3]
  1. Department of Earth and Planetary Science, University of California, Berkeley, CA 94720, USA.; The Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
  2. Engineering Technologies Division, Lawrence Livermore National Laboratory, Livermore, CA 94551, USA.
  3. Department of Earth and Planetary Science, University of California, Berkeley, CA 94720, USA.
  4. The Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
+ Show Author Affiliations
Understanding dynamics across phase transformations and the spatial distribution of minerals in the lower mantle is crucial for a comprehensive model of the evolution of the Earth’s interior. Using the multigrain crystallography technique (MGC) with synchrotron x-rays at pressures of 30 GPa in a laser-heated diamond anvil cell to study the formation of bridgmanite [(Mg,Fe)SiO3] and ferropericlase [(Mg,Fe)O], we report an interconnected network of a smaller grained ferropericlase, a configuration that has been implicated in slab stagnation and plume deflection in the upper part of the lower mantle. Furthermore, we isolated individual crystal orientations with grain-scale resolution, provide estimates on stress evolutions on the grain scale, and report {110} twinning in an iron-depleted bridgmanite, a mechanism that appears to aid stress relaxation during grain growth and likely contributes to the lack of any appreciable seismic anisotropy in the upper portion of the lower mantle.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Univ. of Illinois, Chicago, IL (United States)
Sponsoring Organization:
National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)
Grant/Contract Number:
AC02-05CH11231; AC02-06CH11357; AC52-07NA27344; FG02-05ER15637; NA0003975
OSTI ID:
1755290
Alternate ID(s):
OSTI ID: 1826697
OSTI ID: 1836776
OSTI ID: 1841015
OSTI ID: 1762876
OSTI ID: 1764275
Report Number(s):
LLNL-JRNL--817521; eabd3614
Journal Information:
Science Advances, Journal Name: Science Advances Journal Issue: 1 Vol. 7; ISSN 2375-2548
Publisher:
AAASCopyright Statement
Country of Publication:
United States
Language:
English

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