NDLI: OH-defects in multiple-doped orthoenstatite at 4–8 GPa: filling the gap between pure and natural systems

Content Provider	Springer Nature Link
Author	Stalder, Roland Karimova, Asiya Konzett, Jürgen
Copyright Year	2015
Abstract	OH-defects in orthoenstatite were studied experimentally between 4 and 8 GPa at 1150 °C in the system CaO–MgO–Al2O3–SiO2–Cr2O3–Na2O, leading to phase assemblages enstatite ± forsterite ± diopside ± garnet. In enstatite coexisting with garnet, total OH is negatively correlated with pressure. Conversely, in Al-poor systems without garnet, total OH is positively correlated with pressure, and both trends intersect around 8 GPa and ~1000 wt ppm H2O. IR-spectra of enstatite reveal several pressure sensitive features, such as (1) the absorbance of the absorption band at 3687 cm−1, (2) the band position near 3400 cm−1 and (3) the ratio (A 3240–3570/A 3240–3730) and their application as geobarometer in natural samples are evaluated. For garnet-bearing phase assemblages, the band ratio (A 3240–3570/A 3240–3730) in orthoenstatite defines a pressure trend in between that observed in the pure system MgO–SiO2–H2O and that found in orthopyroxenes from natural mantle peridotites, suggesting that the application of IR-spectra as proxy for pressure is justified.
Starting Page	1
Ending Page	10
Page Count	10
File Format	PDF
ISSN	00107999
Journal	Contributions to Mineralogy and Petrology
Volume Number	169
Issue Number	4
e-ISSN	14320967
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2015-04-04
Publisher Place	Berlin/Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Enstatite Geobarometer High pressure Water incorporation OH-defects Geology Mineral Resources Mineralogy
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Geophysics

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OH-defects in multiple-doped orthoenstatite at 4–8 GPa: filling the gap between pure and natural systems

The potential use of OH-defects in enstatite as geobarometer

DOI 10.1007/s00410-015-1133-8 ORIGINAL PAPER OH‑defects in multiple‑doped orthoenstatite at 4–8 GPa: filling

Theoretical study of OH-defects in pure enstatite

Hydrogen incorporation in enstatite in the system MgO–SiO2–H2O–NaCl

Experimental study of the CaMgSi2O6–CO2 system at 3–8 GPa

Phase relations of phlogopite with magnesite from 4 to 8 GPa

Experimental calibration of a garnet–clinopyroxene geobarometer for mantle eclogites

H2O storage capacity of MgSiO3 clinoenstatite at 8–13 GPa, 1,100–1,400°C

OH-defects in multiple-doped orthoenstatite at 4–8 GPa: filling the gap between pure and natural systems

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OH-defects in multiple-doped orthoenstatite at 4–8 GPa: filling the gap between pure and natural systems

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OH-defects in multiple-doped orthoenstatite at 4–8 GPa: filling the gap between pure and natural systems