Accessible Requires Authentication Published by De Gruyter December 7, 2020

Investigation of the crystal structure of a low water content hydrous olivine to 29.9 GPa: A high-pressure single-crystal X-ray diffraction study

Jingui Xu, Dawei Fan ORCID logo, Dongzhou Zhang, Bo Li, Wenge Zhou and Przemyslaw K. Dera
From the journal American Mineralogist

Abstract

Olivine is the most abundant mineral in the Earth’s upper mantle and subducting slabs. Studying the structural evolution and equation of state of olivine at high-pressure is of fundamental importance in constraining the composition and structure of these regions. Hydrogen can be incorporated into olivine and significantly influence its physical and chemical properties. Previous infrared and Raman spectroscopic studies indicated that local structural changes occur in Mg-rich hydrous olivine (Fo ≥ 95; 4883–9000 ppmw water) at high-pressure. Since water contents of natural olivine are commonly <1000 ppmw, it is inevitable to investigate the effects of such water contents on the equation of state (EoS) and structure of olivine at high-pressure. Here we synthesized a low water content hydrous olivine (Fo95; 1538 ppmw water) at low SiO2 activity and identified that the incorporated hydrogens are predominantly associated with the Si sites. We performed high-pressure single-crystal X‑ray diffraction experiments on this olivine to 29.9 GPa. A third-order Birch-Murnaghan equation of state (BM3 EoS) was fit to the pressure-volume data, yielding the following EoS parameters: VT0 = 290.182(1) Å3, KT0 = 130.8(9) GPa, and KT0=4.16(8).The KT0 is consistent with those of anhydrous Mg-rich olivine, which indicates that such low water content has negligible effects on the bulk modulus of olivine. Furthermore, we carried out the structural refinement of this hydrous olivine as a function of pressure to 29.9 GPa. The results indicate that, similar to the anhydrous olivine, the compression of the M1-O and M2-O bonds are comparable, which are larger than that of the Si-O bonds. The compression of M1-O and M2-O bonds of this hydrous olivine are comparable with those of anhydrous olivine, while the Si-O1 and Si-O2 bonds in the hydrous olivine are more compressible than those in the anhydrous olivine. Therefore, this study suggests that low water content has negligible effects on the EoS of olivine, though the incorporation of water softens the Si-O1 and Si-O2 bond.

Funding source: National Natural Science Foundation of China

Award Identifier / Grant number: 41772043

Award Identifier / Grant number: 41802043

Funding source: National Science Foundation

Award Identifier / Grant number: 1722969

Funding statement: This project was funded by the National Natural Science Foundation of China (Grant Nos. 41772043 and 41802043), the Chinese Academy of Sciences “Light of West China” Program (2017, 2019), the Youth Innovation Promotion Association CAS (Dawei Fan 2018434), and the Innovation and Entrepreneurship Funding of High-Level Overseas Talents of Guizhou Province (Dawei Fan, [2019]10). Part of this work was supported by the National Science Foundation of the United States grant 1722969. The experiments were performed at GeoSoilEnviroCARS (Sector 13), Partnership for Extreme Crystallography program (PX2), Advanced Photon Source (APS), and Argonne National Laboratory. GeoSoilEnviroCARS is supported by the National Science Foundation–Earth Sciences (EAR-1128799) and Department of Energy–Geosciences (DE-FG02-94ER14466). PX2 program is supported by COMPRES under NSF Cooperative Agreement EAR 11-57758. The use of the COMPRES-GSECARS gas loading system was supported by COMPRES under NSF Cooperative Agreement EAR 11-57758 and by GSECARS. Use of the Advanced Photon Source was supported by the U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.

Acknowledgments

Sincere thanks go to S.N. Tkachev for help with gas loading. We thank two anonymous reviewers for their thorough and helpful comments, which helped to improve the quality of this manuscript. We thank S. Dorfman for handling this manuscript.

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Received: 2020-01-20
Accepted: 2020-05-09
Published Online: 2020-12-07
Published in Print: 2020-12-16

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