NDLI: The potential use of OH-defects in enstatite as geobarometer

Content Provider	Springer Nature Link
Author	Prechtel, Felix Stalder, Roland
Copyright Year	2011
Abstract	In this study, single crystals of pure enstatite (Mg2Si2O6) were synthesised under water-saturated conditions at 4 and 8 GPa and 1,150°C with variable silica activity, leading to phase assemblages enstatite + forsterite, enstatite or enstatite + coesite. Run products were investigated using an FTIR spectrometer equipped with a focal plane array detector enabling IR imaging with a lateral pixel resolution of 2.7 μm. IR spectra within the OH-absorption region show two different groups of absorption bands: group 1 (wavenumbers at 3,592 and 3,687 cm−1) shows strongest absorptions for E\|\|n β, whereas group 2 (wavenumbers at 3,067 and 3,362 cm−1) shows strongest absorptions for E\|\|n γ. The groups are related to different defect types, group 1 to tetrahedral defects (T-site vacancies) and group 2 to octahedral defects (M-site vacancies). The intensity ratio of the bands within one group (i.e. A 3067/A 3362 and A 3592/A 3687) and the intensity ratio of E\|\|n γ and E\|\|n α in group 2 bands remain constant within error. In contrast, the intensity ratio of group 2 to group 1 absorption bands [e.g. (A 3362)/(A 3687)] is sensitive to the SiO2 activity and pressure. On the basis of the results of this and previous studies, a barometer for pure orthoenstatite coexisting with forsterite can be formulated: $$ P\,[{\text{GPa}}] = 1.056 + \sqrt {{\frac{{1.025 - A_{{\left( {3362} \right)/\left[ {(3362) + (3687)} \right]}} }}{0.009}}} , $$ where A (3362) and A (3687) are the integral absorbances of the component E\|\|n γ of the absorption bands at 3,362 cm−1 and the component E\|\|n β of the absorption band at 3,687 cm−1, respectively.
Ending Page	623
Page Count	9
Starting Page	615
File Format	PDF
ISSN	00107999
e-ISSN	14320967
Journal	Contributions to Mineralogy and Petrology
Issue Number	3
Volume Number	162
Language	English
Publisher	Springer-Verlag
Publisher Date	2011-02-19
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Enstatite Geology Hydrogen Mineralogy Geobarometer IR imaging Mineral Resources High pressure
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Geophysics

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