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Title: Visualizing the Distribution of Water in Nominally Anhydrous Minerals at the Atomic Scale: Insights From Atom Probe Tomography on Fayalite

Journal Article · · Geophysical Research Letters

Olivine is an important reservoir for hydrogen in the Earth’s upper mantle, and the presence of OH in this nominally anhydrous mineral can play an important role in determining the physical properties of the host phase. Here we report on the 3-D distribution of the hydrated region at atomic scale in fayalite using atom probe tomography. Site-specific analysis reveals regions that are either compositionally homogenous or contain interlayers that are consistent with hydrated dislocations. Elemental distributions of the minor elements within the hydrated interlayers show enrichment of Na, indicating the formation of equilibrium environment is associated with Na geochemically, as well as depletion of Mn and Mg, the result of incompatibility of OH. This direct observation of hydrated region distribution in 3-D at the nanometer scale, can provide insight into the material properties of these nominally anhydrous minerals and possible rheology of upper mantle minerals and geodynamics.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1854906
Report Number(s):
PNNL-SA-160964
Journal Information:
Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 2 Vol. 49; ISSN 0094-8276
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English

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