Deformation and strength of mantle relevant garnets: Implications for the subduction of basaltic-rich crust
Abstract
Garnet is an important mineral phase in the upper mantle as it is both a key component in bulk mantle rocks, and a primary phase at high pressure within subducted basalt. In this work, we focus on the strength of garnet and the texture that develops within garnet during accommodation of differential deformational strain. We use X-ray diffraction in a radial geometry to analyze texture development in situ in three garnet compositions under pressure at 300 K: a natural garnet (Prp60Alm37) to 30 GPa, and two synthetic majorite-bearing compositions (Prp59Maj41 and Prp42Maj58) to 44 GPa. All three garnets develop a modest (100) texture at elevated pressure under axial compression. Elasto-viscoplastic self-consistent (EVPSC) modeling suggests that two slip systems are active in the three garnet compositions at all pressures studied: {110}<$$1\bar{1}1$$> and {001}<110>. We determine a flow strength of ~5 GPa at pressures between 10 to 15 GPa for all three garnets; these values are higher than previously reported yield strengths measured on natural and majoritic garnets. Strengths calculated using the experimental lattice strain differ from the strength generated from those calculated using EVPSC. Prp67Alm33, Prp59Maj41, and Prp42Maj58 are of comparable strength to each other at room temperature, which indicates that majorite substitution does not greatly affect the strength of garnets. Additionally, all three garnets are of similar strength as lower mantle phases such as bridgmanite and ferropericlase, suggesting that garnet may not be notably stronger than the surrounding lower mantle/deep upper mantle phases at the base of the upper mantle.
- Authors:
-
[1];
- Univ. of Chicago, IL (United States); Univ. of Utah, Salt Lake City, UT (United States)
- Univ. of Utah, Salt Lake City, UT (United States); Iowa State Univ., Ames, IA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
- Gakushuin Univ., Tokyo (Japan)
- Univ. of Utah, Salt Lake City, UT (United States)
- Univ. of California, Santa Cruz, CA (United States)
- Publication Date:
- Research Org.:
- Univ. of Illinois, Chicago, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; National Science Foundation (NSF)
- OSTI Identifier:
- 1806306
- Alternate Identifier(s):
- OSTI ID: 1833991
- Grant/Contract Number:
- NA0003975; AC02-05CH11231; NA0003858; EAR-1606856; EAR-1620423; EAR-1654687; EAR PF-1855336
- Resource Type:
- Accepted Manuscript
- Journal Name:
- American Mineralogist
- Additional Journal Information:
- Journal Volume: 106; Journal Issue: 7; Journal ID: ISSN 0003-004X
- Publisher:
- Mineralogical Society of America
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 58 GEOSCIENCES; high-pressure experiment; garnet; texture; strength; radial X-ray diffraction
Citation Formats
Vennari, Cara E., Lin, Feng, Kunz, Martin, Akaogi, Masaki, Miyagi, Lowell, and Williams, Quentin. Deformation and strength of mantle relevant garnets: Implications for the subduction of basaltic-rich crust. United States: N. p., 2021.
Web. doi:10.2138/am-2021-7587.
Vennari, Cara E., Lin, Feng, Kunz, Martin, Akaogi, Masaki, Miyagi, Lowell, & Williams, Quentin. Deformation and strength of mantle relevant garnets: Implications for the subduction of basaltic-rich crust. United States. https://doi.org/10.2138/am-2021-7587
Vennari, Cara E., Lin, Feng, Kunz, Martin, Akaogi, Masaki, Miyagi, Lowell, and Williams, Quentin. Thu .
"Deformation and strength of mantle relevant garnets: Implications for the subduction of basaltic-rich crust". United States. https://doi.org/10.2138/am-2021-7587. https://www.osti.gov/servlets/purl/1806306.
@article{osti_1806306,
title = {Deformation and strength of mantle relevant garnets: Implications for the subduction of basaltic-rich crust},
author = {Vennari, Cara E. and Lin, Feng and Kunz, Martin and Akaogi, Masaki and Miyagi, Lowell and Williams, Quentin},
abstractNote = {Garnet is an important mineral phase in the upper mantle as it is both a key component in bulk mantle rocks, and a primary phase at high pressure within subducted basalt. In this work, we focus on the strength of garnet and the texture that develops within garnet during accommodation of differential deformational strain. We use X-ray diffraction in a radial geometry to analyze texture development in situ in three garnet compositions under pressure at 300 K: a natural garnet (Prp60Alm37) to 30 GPa, and two synthetic majorite-bearing compositions (Prp59Maj41 and Prp42Maj58) to 44 GPa. All three garnets develop a modest (100) texture at elevated pressure under axial compression. Elasto-viscoplastic self-consistent (EVPSC) modeling suggests that two slip systems are active in the three garnet compositions at all pressures studied: {110}<$1\bar{1}1$> and {001}<110>. We determine a flow strength of ~5 GPa at pressures between 10 to 15 GPa for all three garnets; these values are higher than previously reported yield strengths measured on natural and majoritic garnets. Strengths calculated using the experimental lattice strain differ from the strength generated from those calculated using EVPSC. Prp67Alm33, Prp59Maj41, and Prp42Maj58 are of comparable strength to each other at room temperature, which indicates that majorite substitution does not greatly affect the strength of garnets. Additionally, all three garnets are of similar strength as lower mantle phases such as bridgmanite and ferropericlase, suggesting that garnet may not be notably stronger than the surrounding lower mantle/deep upper mantle phases at the base of the upper mantle.},
doi = {10.2138/am-2021-7587},
journal = {American Mineralogist},
number = 7,
volume = 106,
place = {United States},
year = {Thu Jul 01 00:00:00 EDT 2021},
month = {Thu Jul 01 00:00:00 EDT 2021}
}
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