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Syn‐Shearing Deformation Mechanisms of Minerals in Partially Molten Metapelites
We investigated an experimentally sheared (γ = 15, γ˙ = 3 × 10−4 s−1, 300 MPa, 750°C) quartz‐muscovite aggregate to understand the deformation of parent and new crystals in partially molten rocks. The scanning electron microscope and electron backscatter diffraction analyses along the longitudinal a...
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Published in: | Geophysical research letters 2021-11, Vol.48 (22), p.n/a |
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description | We investigated an experimentally sheared (γ = 15, γ˙ = 3 × 10−4 s−1, 300 MPa, 750°C) quartz‐muscovite aggregate to understand the deformation of parent and new crystals in partially molten rocks. The scanning electron microscope and electron backscatter diffraction analyses along the longitudinal axial section of the cylindrical sample suggest that quartz and muscovite melted partially and later produced K‐feldspar, ilmenite, biotite, mullite, and cordierite. Quartz grains became finer, and muscovite was almost entirely consumed in the process. With increasing γ, melt and crystal fractions decreased and increased, respectively. Among the new minerals, K‐feldspar grains (highest area fraction and coarsest) nucleated first, whereas cordierite and mullite grains, finest and least in number, respectively, nucleated last. Fine grain size, weak crystallographic preferred orientations, low intragranular deformation, and equant shapes suggest both initial and new minerals deformed dominantly by melt‐assisted grain boundary sliding, which is further substantiated by higher misorientations between adjacent grains of quartz, K‐feldspar, and ilmenite.
Plain Language Summary
The processes governing the deformation of minerals in partially molten rocks are poorly understood as we generally only see the end product. To focus light on this, we sheared quartz and muscovite aggregate to a large shear strain at high pressure and temperature, where these two minerals underwent partial melting and produced new minerals. Electron backscatter diffraction based microstructural investigations of an experimentally sheared partial melt reveal that even at elevated pressure and temperatures, and significant magnitude of deformation, the presence of melt, together with strain partitioning and low intergranular stress transfer, inhibited intragranular plastic deformation in the remaining starting materials and the newly grown crystals.
Key Points
In an HPT torsion experiment (γ = 15), quartz‐muscovite melted partially and produced K‐feldspar, ilmenite, biotite, mullite, and cordierite
Quartz grain size reduced, muscovite was consumed entirely, K‐feldspar grains nucleated first while mullite/cordierite nucleated last
Melt‐assisted grain boundary sliding was the dominant deformation mechanism for the reactants and “in‐situ” melt‐crystallized phases |
doi_str_mv | 10.1029/2021GL094667 |
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Plain Language Summary
The processes governing the deformation of minerals in partially molten rocks are poorly understood as we generally only see the end product. To focus light on this, we sheared quartz and muscovite aggregate to a large shear strain at high pressure and temperature, where these two minerals underwent partial melting and produced new minerals. Electron backscatter diffraction based microstructural investigations of an experimentally sheared partial melt reveal that even at elevated pressure and temperatures, and significant magnitude of deformation, the presence of melt, together with strain partitioning and low intergranular stress transfer, inhibited intragranular plastic deformation in the remaining starting materials and the newly grown crystals.
Key Points
In an HPT torsion experiment (γ = 15), quartz‐muscovite melted partially and produced K‐feldspar, ilmenite, biotite, mullite, and cordierite
Quartz grain size reduced, muscovite was consumed entirely, K‐feldspar grains nucleated first while mullite/cordierite nucleated last
Melt‐assisted grain boundary sliding was the dominant deformation mechanism for the reactants and “in‐situ” melt‐crystallized phases</description><identifier>ISSN: 0094-8276</identifier><identifier>EISSN: 1944-8007</identifier><identifier>DOI: 10.1029/2021GL094667</identifier><language>eng</language><publisher>Washington: John Wiley & Sons, Inc</publisher><subject>Aggregates ; Backscatter ; Biotite ; Cordierite ; CPO ; Crystal growth ; Crystallography ; Crystals ; Deformation ; Deformation mechanisms ; Diffraction ; Earth Sciences ; EBSD ; Electron backscatter diffraction ; Feldspars ; Grain boundary sliding ; Grain size ; High pressure ; Ilmenite ; metapelite ; Mica ; Minerals ; misorientation analysis ; Mullite ; Muscovite ; partial melt ; Plastic deformation ; Quartz ; Rock ; Rocks ; Scanning electron microscopy ; Sciences of the Universe ; Shear strain ; Shearing ; Strain ; Stress transfer ; torsion experiment</subject><ispartof>Geophysical research letters, 2021-11, Vol.48 (22), p.n/a</ispartof><rights>2021. American Geophysical Union. All Rights Reserved.</rights><rights>Copyright</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><cites>FETCH-LOGICAL-a3595-d6369f53d7e8632f97db720e95236446fcc3de645f0c9bc0c3ed583da3c38ce23</cites><orcidid>0000-0001-9247-6388 ; 0000-0002-2364-1965</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1029%2F2021GL094667$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1029%2F2021GL094667$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>230,314,780,784,885,11514,27924,27925,46468,46892</link.rule.ids><backlink>$$Uhttps://insu.hal.science/insu-03661281$$DView record in HAL$$Hfree_for_read</backlink></links><search><creatorcontrib>Dutta, Dripta</creatorcontrib><creatorcontrib>Misra, Santanu</creatorcontrib><creatorcontrib>Mainprice, David</creatorcontrib><title>Syn‐Shearing Deformation Mechanisms of Minerals in Partially Molten Metapelites</title><title>Geophysical research letters</title><description>We investigated an experimentally sheared (γ = 15, γ˙ = 3 × 10−4 s−1, 300 MPa, 750°C) quartz‐muscovite aggregate to understand the deformation of parent and new crystals in partially molten rocks. The scanning electron microscope and electron backscatter diffraction analyses along the longitudinal axial section of the cylindrical sample suggest that quartz and muscovite melted partially and later produced K‐feldspar, ilmenite, biotite, mullite, and cordierite. Quartz grains became finer, and muscovite was almost entirely consumed in the process. With increasing γ, melt and crystal fractions decreased and increased, respectively. Among the new minerals, K‐feldspar grains (highest area fraction and coarsest) nucleated first, whereas cordierite and mullite grains, finest and least in number, respectively, nucleated last. Fine grain size, weak crystallographic preferred orientations, low intragranular deformation, and equant shapes suggest both initial and new minerals deformed dominantly by melt‐assisted grain boundary sliding, which is further substantiated by higher misorientations between adjacent grains of quartz, K‐feldspar, and ilmenite.
Plain Language Summary
The processes governing the deformation of minerals in partially molten rocks are poorly understood as we generally only see the end product. To focus light on this, we sheared quartz and muscovite aggregate to a large shear strain at high pressure and temperature, where these two minerals underwent partial melting and produced new minerals. Electron backscatter diffraction based microstructural investigations of an experimentally sheared partial melt reveal that even at elevated pressure and temperatures, and significant magnitude of deformation, the presence of melt, together with strain partitioning and low intergranular stress transfer, inhibited intragranular plastic deformation in the remaining starting materials and the newly grown crystals.
Key Points
In an HPT torsion experiment (γ = 15), quartz‐muscovite melted partially and produced K‐feldspar, ilmenite, biotite, mullite, and cordierite
Quartz grain size reduced, muscovite was consumed entirely, K‐feldspar grains nucleated first while mullite/cordierite nucleated last
Melt‐assisted grain boundary sliding was the dominant deformation mechanism for the reactants and “in‐situ” melt‐crystallized phases</description><subject>Aggregates</subject><subject>Backscatter</subject><subject>Biotite</subject><subject>Cordierite</subject><subject>CPO</subject><subject>Crystal growth</subject><subject>Crystallography</subject><subject>Crystals</subject><subject>Deformation</subject><subject>Deformation mechanisms</subject><subject>Diffraction</subject><subject>Earth Sciences</subject><subject>EBSD</subject><subject>Electron backscatter diffraction</subject><subject>Feldspars</subject><subject>Grain boundary sliding</subject><subject>Grain size</subject><subject>High pressure</subject><subject>Ilmenite</subject><subject>metapelite</subject><subject>Mica</subject><subject>Minerals</subject><subject>misorientation analysis</subject><subject>Mullite</subject><subject>Muscovite</subject><subject>partial melt</subject><subject>Plastic deformation</subject><subject>Quartz</subject><subject>Rock</subject><subject>Rocks</subject><subject>Scanning electron microscopy</subject><subject>Sciences of the Universe</subject><subject>Shear strain</subject><subject>Shearing</subject><subject>Strain</subject><subject>Stress transfer</subject><subject>torsion experiment</subject><issn>0094-8276</issn><issn>1944-8007</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2021</creationdate><recordtype>article</recordtype><recordid>eNp90MtKw0AUBuBBFKzVnQ8QcCdGz1wyySyLl1ZI8VJdD9PJjJ2SJnUmVbLzEXxGn8SUiLhydeDw8XPOj9AxhnMMRFwQIHicg2CcpztogAVjcQaQ7qIBdNs4IynfRwchLAGAAsUD9DBrq6-Pz9nCKO-ql-jK2NqvVOPqKpoavVCVC6sQ1Taausp4VYbIVdG98o1TZdlG07pszJY2am1K15hwiPZsx8zRzxyi55vrp8tJnN-Nby9HeaxoIpK44JQLm9AiNRmnxIq0mKcEjEgI5YxxqzUtDGeJBS3mGjQ1RZLRQlFNM20IHaLTPnehSrn2bqV8K2vl5GSUS1eFjQTKOSYZfsMdPunx2tevGxMauaw3vuruk4QDZkwIYJ0665X2dQje2N9cDHLbsPzbcMdJz99dadp_rRw_5t2XIqHf8oN8XQ</recordid><startdate>20211128</startdate><enddate>20211128</enddate><creator>Dutta, Dripta</creator><creator>Misra, Santanu</creator><creator>Mainprice, David</creator><general>John Wiley & Sons, Inc</general><general>American Geophysical Union</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7TG</scope><scope>7TN</scope><scope>8FD</scope><scope>F1W</scope><scope>FR3</scope><scope>H8D</scope><scope>H96</scope><scope>KL.</scope><scope>KR7</scope><scope>L.G</scope><scope>L7M</scope><scope>1XC</scope><scope>VOOES</scope><orcidid>https://orcid.org/0000-0001-9247-6388</orcidid><orcidid>https://orcid.org/0000-0002-2364-1965</orcidid></search><sort><creationdate>20211128</creationdate><title>Syn‐Shearing Deformation Mechanisms of Minerals in Partially Molten Metapelites</title><author>Dutta, Dripta ; Misra, Santanu ; Mainprice, David</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a3595-d6369f53d7e8632f97db720e95236446fcc3de645f0c9bc0c3ed583da3c38ce23</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2021</creationdate><topic>Aggregates</topic><topic>Backscatter</topic><topic>Biotite</topic><topic>Cordierite</topic><topic>CPO</topic><topic>Crystal growth</topic><topic>Crystallography</topic><topic>Crystals</topic><topic>Deformation</topic><topic>Deformation mechanisms</topic><topic>Diffraction</topic><topic>Earth Sciences</topic><topic>EBSD</topic><topic>Electron backscatter diffraction</topic><topic>Feldspars</topic><topic>Grain boundary sliding</topic><topic>Grain size</topic><topic>High pressure</topic><topic>Ilmenite</topic><topic>metapelite</topic><topic>Mica</topic><topic>Minerals</topic><topic>misorientation analysis</topic><topic>Mullite</topic><topic>Muscovite</topic><topic>partial melt</topic><topic>Plastic deformation</topic><topic>Quartz</topic><topic>Rock</topic><topic>Rocks</topic><topic>Scanning electron microscopy</topic><topic>Sciences of the Universe</topic><topic>Shear strain</topic><topic>Shearing</topic><topic>Strain</topic><topic>Stress transfer</topic><topic>torsion experiment</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Dutta, Dripta</creatorcontrib><creatorcontrib>Misra, Santanu</creatorcontrib><creatorcontrib>Mainprice, David</creatorcontrib><collection>CrossRef</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Oceanic Abstracts</collection><collection>Technology Research Database</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Civil Engineering Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Hyper Article en Ligne (HAL)</collection><collection>Hyper Article en Ligne (HAL) (Open Access)</collection><jtitle>Geophysical research letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Dutta, Dripta</au><au>Misra, Santanu</au><au>Mainprice, David</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Syn‐Shearing Deformation Mechanisms of Minerals in Partially Molten Metapelites</atitle><jtitle>Geophysical research letters</jtitle><date>2021-11-28</date><risdate>2021</risdate><volume>48</volume><issue>22</issue><epage>n/a</epage><issn>0094-8276</issn><eissn>1944-8007</eissn><abstract>We investigated an experimentally sheared (γ = 15, γ˙ = 3 × 10−4 s−1, 300 MPa, 750°C) quartz‐muscovite aggregate to understand the deformation of parent and new crystals in partially molten rocks. The scanning electron microscope and electron backscatter diffraction analyses along the longitudinal axial section of the cylindrical sample suggest that quartz and muscovite melted partially and later produced K‐feldspar, ilmenite, biotite, mullite, and cordierite. Quartz grains became finer, and muscovite was almost entirely consumed in the process. With increasing γ, melt and crystal fractions decreased and increased, respectively. Among the new minerals, K‐feldspar grains (highest area fraction and coarsest) nucleated first, whereas cordierite and mullite grains, finest and least in number, respectively, nucleated last. Fine grain size, weak crystallographic preferred orientations, low intragranular deformation, and equant shapes suggest both initial and new minerals deformed dominantly by melt‐assisted grain boundary sliding, which is further substantiated by higher misorientations between adjacent grains of quartz, K‐feldspar, and ilmenite.
Plain Language Summary
The processes governing the deformation of minerals in partially molten rocks are poorly understood as we generally only see the end product. To focus light on this, we sheared quartz and muscovite aggregate to a large shear strain at high pressure and temperature, where these two minerals underwent partial melting and produced new minerals. Electron backscatter diffraction based microstructural investigations of an experimentally sheared partial melt reveal that even at elevated pressure and temperatures, and significant magnitude of deformation, the presence of melt, together with strain partitioning and low intergranular stress transfer, inhibited intragranular plastic deformation in the remaining starting materials and the newly grown crystals.
Key Points
In an HPT torsion experiment (γ = 15), quartz‐muscovite melted partially and produced K‐feldspar, ilmenite, biotite, mullite, and cordierite
Quartz grain size reduced, muscovite was consumed entirely, K‐feldspar grains nucleated first while mullite/cordierite nucleated last
Melt‐assisted grain boundary sliding was the dominant deformation mechanism for the reactants and “in‐situ” melt‐crystallized phases</abstract><cop>Washington</cop><pub>John Wiley & Sons, Inc</pub><doi>10.1029/2021GL094667</doi><tpages>10</tpages><orcidid>https://orcid.org/0000-0001-9247-6388</orcidid><orcidid>https://orcid.org/0000-0002-2364-1965</orcidid><oa>free_for_read</oa></addata></record> |
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subjects | Aggregates Backscatter Biotite Cordierite CPO Crystal growth Crystallography Crystals Deformation Deformation mechanisms Diffraction Earth Sciences EBSD Electron backscatter diffraction Feldspars Grain boundary sliding Grain size High pressure Ilmenite metapelite Mica Minerals misorientation analysis Mullite Muscovite partial melt Plastic deformation Quartz Rock Rocks Scanning electron microscopy Sciences of the Universe Shear strain Shearing Strain Stress transfer torsion experiment |
title | Syn‐Shearing Deformation Mechanisms of Minerals in Partially Molten Metapelites |
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