Thermal Equation of State of Natural Ti-Bearing Clinohumite
Abstract
The natural occurrence of clinohumite in metabasalts and hydrothermally altered peridotites provides a source of water-rich minerals in subducted slabs, making knowledge of their phase relations and crystal chemistry under high pressure-temperature (P-T) conditions important for understating volatile recycling and geodynamic process in the Earth's mantle. Here we present a synchrotron-based, single-crystal X-ray diffraction study on two natural Ti-bearing clinohumites up to ~28 GPa and 750 K in order to simulate conditions within subducted slabs. No phase transition occurs in clinohumite over this P-T range. Pressure-volume relationships of both compositions at room temperature were fitted to a third-order Birch-Murnaghan equation of state (EoS) with V0 = 650.4(3) Å3, KT0 = 141(4) GPa, and KT0' = 4.0(6) for Ti-poor clinohumite (0.07 Ti per formula unit, pfu) and V0 = 650.8(3) Å3, KT0 = 144(4) GPa, and KT0' = 3.6(7) for Ti-rich clinohumite (0.21 Ti pfu). Both clinohumites exhibit anisotropic compression with βb > βc > βa. We also refined P-V-T equation of state parameters using the high-temperature Birch-Murnaghan EoS, yielding (∂KT0/∂T)P = –0.040(10) GPa/K and αT = 5.1(6) × 10-5 K-1 for Ti-poor clinohumite and (∂KT0/∂T)P = –0.045(11) GPa/K and αT = 5.7(6) × 10-5 K-1 for Ti-rich clinohumite. We report Ti-poor and Ti-rich clinohumites display similar equations of state but are ~20% more incompressible than Mg-pure clinohumite and display ~5% higher bulk sound velocity than olivine at upper mantle conditions. Our results provide constraints for modeling geodynamic processmore »
- Authors:
-
- Peking Univ., Beijing (China); Northwestern Univ., Evanston, IL (United States)
- China Univ. of Geosciences, Wuhan (China)
- Univ. of Hawaii at Mānoa, Honolulu HI (United States)
- Peking Univ., Beijing (China)
- Northwestern Univ., Evanston, IL (United States)
- Publication Date:
- Research Org.:
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
- Sponsoring Org.:
- National Natural Science Foundation of China (NSFC); Chinese Scholarship Council (CSC); National Science Foundation (NSF); The David and Lucile Packard Foundation; USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division
- OSTI Identifier:
- 1423340
- Grant/Contract Number:
- 41473056; 41472037; EAR-1452344; EAR-1128799; FG02-94ER14466; AC02-06CH11357; EAR-1661511
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of Geophysical Research. Solid Earth
- Additional Journal Information:
- Journal Volume: 122; Journal Issue: 11; Journal ID: ISSN 2169-9313
- Publisher:
- American Geophysical Union
- Country of Publication:
- United States
- Language:
- ENGLISH
- Subject:
- 58 GEOSCIENCES; Ti‐bearing clinohumite; thermal equation of state; single‐crystal X‐ray diffraction; high pressure and high temperature HFSE; subducted slabs
Citation Formats
Qin, Fei, Wu, Xiang, Zhang, Dongzhou, Qin, Shan, and Jacobsen, Steven D. Thermal Equation of State of Natural Ti-Bearing Clinohumite. United States: N. p., 2017.
Web. doi:10.1002/2017JB014827.
Qin, Fei, Wu, Xiang, Zhang, Dongzhou, Qin, Shan, & Jacobsen, Steven D. Thermal Equation of State of Natural Ti-Bearing Clinohumite. United States. https://doi.org/10.1002/2017JB014827
Qin, Fei, Wu, Xiang, Zhang, Dongzhou, Qin, Shan, and Jacobsen, Steven D. Fri .
"Thermal Equation of State of Natural Ti-Bearing Clinohumite". United States. https://doi.org/10.1002/2017JB014827. https://www.osti.gov/servlets/purl/1423340.
@article{osti_1423340,
title = {Thermal Equation of State of Natural Ti-Bearing Clinohumite},
author = {Qin, Fei and Wu, Xiang and Zhang, Dongzhou and Qin, Shan and Jacobsen, Steven D.},
abstractNote = {The natural occurrence of clinohumite in metabasalts and hydrothermally altered peridotites provides a source of water-rich minerals in subducted slabs, making knowledge of their phase relations and crystal chemistry under high pressure-temperature (P-T) conditions important for understating volatile recycling and geodynamic process in the Earth's mantle. Here we present a synchrotron-based, single-crystal X-ray diffraction study on two natural Ti-bearing clinohumites up to ~28 GPa and 750 K in order to simulate conditions within subducted slabs. No phase transition occurs in clinohumite over this P-T range. Pressure-volume relationships of both compositions at room temperature were fitted to a third-order Birch-Murnaghan equation of state (EoS) with V0 = 650.4(3) Å3, KT0 = 141(4) GPa, and KT0' = 4.0(6) for Ti-poor clinohumite (0.07 Ti per formula unit, pfu) and V0 = 650.8(3) Å3, KT0 = 144(4) GPa, and KT0' = 3.6(7) for Ti-rich clinohumite (0.21 Ti pfu). Both clinohumites exhibit anisotropic compression with βb > βc > βa. We also refined P-V-T equation of state parameters using the high-temperature Birch-Murnaghan EoS, yielding (∂KT0/∂T)P = –0.040(10) GPa/K and αT = 5.1(6) × 10-5 K-1 for Ti-poor clinohumite and (∂KT0/∂T)P = –0.045(11) GPa/K and αT = 5.7(6) × 10-5 K-1 for Ti-rich clinohumite. We report Ti-poor and Ti-rich clinohumites display similar equations of state but are ~20% more incompressible than Mg-pure clinohumite and display ~5% higher bulk sound velocity than olivine at upper mantle conditions. Our results provide constraints for modeling geodynamic process related to the subduction and transport of potentially water-rich slabs in the mantle.},
doi = {10.1002/2017JB014827},
journal = {Journal of Geophysical Research. Solid Earth},
number = 11,
volume = 122,
place = {United States},
year = {2017},
month = {11}
}
Web of Science
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