Semibrittle deformation and partial melting of perthitic K-feldspar: An experimental study
To investigate the relationships between deformation, cracking, and partial melting in the lower continental crust, axial compression and hydrostatic experiments were performed on K‐feldspar single crystals at temperatures of 700° and 900°C and confining pressures between 0.75 and 1.5 GPa. Sample de...
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| Veröffentlicht in: | Journal of geophysical research. Biogeosciences 2014-04, Vol.119 (4), p.3478-3502 |
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| container_title | Journal of geophysical research. Biogeosciences |
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| creator | Negrini, Marianne Stünitz, Holger Nasipuri, Pritam Menegon, Luca Morales, Luiz F. G. |
| description | To investigate the relationships between deformation, cracking, and partial melting in the lower continental crust, axial compression and hydrostatic experiments were performed on K‐feldspar single crystals at temperatures of 700° and 900°C and confining pressures between 0.75 and 1.5 GPa. Sample deformation was carried out at a constant strain rate of ~ 10
−6
s
−1
. The samples deformed at 700°C show typical brittle behavior with formation of conjugate fractures and peak stresses that increase with confining pressure. Samples deformed at 900°C show formation of shear fractures, peak stresses below the Goetze criterion, and inverse confining pressure dependence of peak stress, indicating that along the fractures deformation was not dominantly friction controlled. Microstructural and chemical analyses reveal the presence of melt ( |
| doi_str_mv | 10.1002/2013JB010573 |
| format | Article |
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−6
s
−1
. The samples deformed at 700°C show typical brittle behavior with formation of conjugate fractures and peak stresses that increase with confining pressure. Samples deformed at 900°C show formation of shear fractures, peak stresses below the Goetze criterion, and inverse confining pressure dependence of peak stress, indicating that along the fractures deformation was not dominantly friction controlled. Microstructural and chemical analyses reveal the presence of melt (<6 vol %) of inhomogeneous composition along the shear zones and chemical compositional changes of gouge fragments. In a hydrostatic experiment performed at 900°C, no melt and no compositional changes were observed. These observations indicate that deformation of K‐feldspars at high pressures and temperatures is controlled by the simultaneous formation of brittle fractures and melt. The formation of melt is strongly accelerated and kinetically favored by cracking, as demonstrated by the absence of melting in the hydrostatic experiments. However, the melt along fractures does not dramatically weaken the samples, as the melt domains remain isolated during deformation. The fine‐grained gouge fragments formed along the fracture systems undergo chemical homogenization. The dominant deformation mechanism in the gouge is likely to be melt‐enhanced diffusion creep, which may also assist the chemical homogenization process.
Deformation experiments on single crystals of K‐feldspar
Brittle fracturing and partial melting intimately related
Fine‐grained gouges deform by dissolution‐precipitation creep</description><identifier>ISSN: 2169-9313</identifier><identifier>ISSN: 2169-8953</identifier><identifier>EISSN: 2169-9356</identifier><identifier>EISSN: 2169-8961</identifier><identifier>DOI: 10.1002/2013JB010573</identifier><language>eng</language><publisher>Washington: Blackwell Publishing Ltd</publisher><subject>Axial compression ; Brittle fracture ; Chemical analysis ; Compression ; Confining ; Continental crust ; Cracking (corrosion) ; Crystals ; Deformation ; deformation experiments ; Deformation mechanisms ; dissolution-precipitation ; Enhanced diffusion ; Feldspars ; Fracture mechanics ; fracturing ; Fragments ; Geochemistry ; Geophysics ; Homogenization ; Homogenizing ; Hydrostatics ; K-feldspar ; lower crust ; Melting ; Melts ; Pressure dependence ; Shear ; Shear zone ; Single crystals ; Solifluction ; Strain rate ; Stresses ; VDP</subject><ispartof>Journal of geophysical research. Biogeosciences, 2014-04, Vol.119 (4), p.3478-3502</ispartof><rights>2014. American Geophysical Union. All Rights Reserved.</rights><rights>2014. This article is published under http://creativecommons.org/licenses/by-nc-nd/3.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><rights>info:eu-repo/semantics/openAccess</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a3613-cd76cf86027bfd47f71304ee33e669eddc6c083c3e3b72ffed54a22de83bff043</citedby><cites>FETCH-LOGICAL-a3613-cd76cf86027bfd47f71304ee33e669eddc6c083c3e3b72ffed54a22de83bff043</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,776,780,881,26544,27901,27902</link.rule.ids></links><search><creatorcontrib>Negrini, Marianne</creatorcontrib><creatorcontrib>Stünitz, Holger</creatorcontrib><creatorcontrib>Nasipuri, Pritam</creatorcontrib><creatorcontrib>Menegon, Luca</creatorcontrib><creatorcontrib>Morales, Luiz F. G.</creatorcontrib><title>Semibrittle deformation and partial melting of perthitic K-feldspar: An experimental study</title><title>Journal of geophysical research. Biogeosciences</title><addtitle>J. Geophys. Res. Solid Earth</addtitle><description>To investigate the relationships between deformation, cracking, and partial melting in the lower continental crust, axial compression and hydrostatic experiments were performed on K‐feldspar single crystals at temperatures of 700° and 900°C and confining pressures between 0.75 and 1.5 GPa. Sample deformation was carried out at a constant strain rate of ~ 10
−6
s
−1
. The samples deformed at 700°C show typical brittle behavior with formation of conjugate fractures and peak stresses that increase with confining pressure. Samples deformed at 900°C show formation of shear fractures, peak stresses below the Goetze criterion, and inverse confining pressure dependence of peak stress, indicating that along the fractures deformation was not dominantly friction controlled. Microstructural and chemical analyses reveal the presence of melt (<6 vol %) of inhomogeneous composition along the shear zones and chemical compositional changes of gouge fragments. In a hydrostatic experiment performed at 900°C, no melt and no compositional changes were observed. These observations indicate that deformation of K‐feldspars at high pressures and temperatures is controlled by the simultaneous formation of brittle fractures and melt. The formation of melt is strongly accelerated and kinetically favored by cracking, as demonstrated by the absence of melting in the hydrostatic experiments. However, the melt along fractures does not dramatically weaken the samples, as the melt domains remain isolated during deformation. The fine‐grained gouge fragments formed along the fracture systems undergo chemical homogenization. The dominant deformation mechanism in the gouge is likely to be melt‐enhanced diffusion creep, which may also assist the chemical homogenization process.
Deformation experiments on single crystals of K‐feldspar
Brittle fracturing and partial melting intimately related
Fine‐grained gouges deform by dissolution‐precipitation creep</description><subject>Axial compression</subject><subject>Brittle fracture</subject><subject>Chemical analysis</subject><subject>Compression</subject><subject>Confining</subject><subject>Continental crust</subject><subject>Cracking (corrosion)</subject><subject>Crystals</subject><subject>Deformation</subject><subject>deformation experiments</subject><subject>Deformation mechanisms</subject><subject>dissolution-precipitation</subject><subject>Enhanced diffusion</subject><subject>Feldspars</subject><subject>Fracture mechanics</subject><subject>fracturing</subject><subject>Fragments</subject><subject>Geochemistry</subject><subject>Geophysics</subject><subject>Homogenization</subject><subject>Homogenizing</subject><subject>Hydrostatics</subject><subject>K-feldspar</subject><subject>lower crust</subject><subject>Melting</subject><subject>Melts</subject><subject>Pressure dependence</subject><subject>Shear</subject><subject>Shear zone</subject><subject>Single crystals</subject><subject>Solifluction</subject><subject>Strain rate</subject><subject>Stresses</subject><subject>VDP</subject><issn>2169-9313</issn><issn>2169-8953</issn><issn>2169-9356</issn><issn>2169-8961</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2014</creationdate><recordtype>article</recordtype><sourceid>3HK</sourceid><recordid>eNp90ctPHSEUB-CJsYlG3bluSNx04ShweMx0pzf1VaML25h0Q7jDQdF53AI30f9ezFXTdCEbCHyc_DhU1S6jB4xSfsgpg4tjyqjUsFZtcqbaugWp1j_WDDaqnZQeaBlN2WJis_pzg0OYx5Bzj8Shn-Jgc5hGYkdHFjbmYHsyYJ_DeEcmTxYY833IoSM_a4-9S8V8J0cjwadyFAYcc7mQ8tI9b1dfvO0T7rzNW9Xvkx-_Zmf15fXp-ezosragGNSd06rzjaJcz70T2msGVCACoFItOtepjjbQAcJcc-_RSWE5d9jA3HsqYKv6uqrbxZBKTjNO0ZrSE9BGy-YVfFuBRZz-LjFlM4TUYd_bEadlMkwKJqTQrSx07z_6MC3jWOIbLmUrWyHpp4opwZWiLWNF7b_nmlKK6M2iNMjG55LtNR43_35Z4fWKl0fg04e18dEoDVqa26tTc3N8Nbtt9YkR8AK9gJVP</recordid><startdate>20140401</startdate><enddate>20140401</enddate><creator>Negrini, Marianne</creator><creator>Stünitz, Holger</creator><creator>Nasipuri, Pritam</creator><creator>Menegon, Luca</creator><creator>Morales, Luiz F. G.</creator><general>Blackwell Publishing Ltd</general><general>American Geophysical Union (AGU)</general><scope>BSCLL</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7ST</scope><scope>7TG</scope><scope>8FD</scope><scope>C1K</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>SOI</scope><scope>3HK</scope></search><sort><creationdate>20140401</creationdate><title>Semibrittle deformation and partial melting of perthitic K-feldspar: An experimental study</title><author>Negrini, Marianne ; Stünitz, Holger ; Nasipuri, Pritam ; Menegon, Luca ; Morales, Luiz F. G.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a3613-cd76cf86027bfd47f71304ee33e669eddc6c083c3e3b72ffed54a22de83bff043</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2014</creationdate><topic>Axial compression</topic><topic>Brittle fracture</topic><topic>Chemical analysis</topic><topic>Compression</topic><topic>Confining</topic><topic>Continental crust</topic><topic>Cracking (corrosion)</topic><topic>Crystals</topic><topic>Deformation</topic><topic>deformation experiments</topic><topic>Deformation mechanisms</topic><topic>dissolution-precipitation</topic><topic>Enhanced diffusion</topic><topic>Feldspars</topic><topic>Fracture mechanics</topic><topic>fracturing</topic><topic>Fragments</topic><topic>Geochemistry</topic><topic>Geophysics</topic><topic>Homogenization</topic><topic>Homogenizing</topic><topic>Hydrostatics</topic><topic>K-feldspar</topic><topic>lower crust</topic><topic>Melting</topic><topic>Melts</topic><topic>Pressure dependence</topic><topic>Shear</topic><topic>Shear zone</topic><topic>Single crystals</topic><topic>Solifluction</topic><topic>Strain rate</topic><topic>Stresses</topic><topic>VDP</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Negrini, Marianne</creatorcontrib><creatorcontrib>Stünitz, Holger</creatorcontrib><creatorcontrib>Nasipuri, Pritam</creatorcontrib><creatorcontrib>Menegon, Luca</creatorcontrib><creatorcontrib>Morales, Luiz F. G.</creatorcontrib><collection>Istex</collection><collection>CrossRef</collection><collection>Environment Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</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>Environment Abstracts</collection><collection>NORA - Norwegian Open Research Archives</collection><jtitle>Journal of geophysical research. Biogeosciences</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Negrini, Marianne</au><au>Stünitz, Holger</au><au>Nasipuri, Pritam</au><au>Menegon, Luca</au><au>Morales, Luiz F. G.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Semibrittle deformation and partial melting of perthitic K-feldspar: An experimental study</atitle><jtitle>Journal of geophysical research. Biogeosciences</jtitle><addtitle>J. Geophys. Res. Solid Earth</addtitle><date>2014-04-01</date><risdate>2014</risdate><volume>119</volume><issue>4</issue><spage>3478</spage><epage>3502</epage><pages>3478-3502</pages><issn>2169-9313</issn><issn>2169-8953</issn><eissn>2169-9356</eissn><eissn>2169-8961</eissn><abstract>To investigate the relationships between deformation, cracking, and partial melting in the lower continental crust, axial compression and hydrostatic experiments were performed on K‐feldspar single crystals at temperatures of 700° and 900°C and confining pressures between 0.75 and 1.5 GPa. Sample deformation was carried out at a constant strain rate of ~ 10
−6
s
−1
. The samples deformed at 700°C show typical brittle behavior with formation of conjugate fractures and peak stresses that increase with confining pressure. Samples deformed at 900°C show formation of shear fractures, peak stresses below the Goetze criterion, and inverse confining pressure dependence of peak stress, indicating that along the fractures deformation was not dominantly friction controlled. Microstructural and chemical analyses reveal the presence of melt (<6 vol %) of inhomogeneous composition along the shear zones and chemical compositional changes of gouge fragments. In a hydrostatic experiment performed at 900°C, no melt and no compositional changes were observed. These observations indicate that deformation of K‐feldspars at high pressures and temperatures is controlled by the simultaneous formation of brittle fractures and melt. The formation of melt is strongly accelerated and kinetically favored by cracking, as demonstrated by the absence of melting in the hydrostatic experiments. However, the melt along fractures does not dramatically weaken the samples, as the melt domains remain isolated during deformation. The fine‐grained gouge fragments formed along the fracture systems undergo chemical homogenization. The dominant deformation mechanism in the gouge is likely to be melt‐enhanced diffusion creep, which may also assist the chemical homogenization process.
Deformation experiments on single crystals of K‐feldspar
Brittle fracturing and partial melting intimately related
Fine‐grained gouges deform by dissolution‐precipitation creep</abstract><cop>Washington</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1002/2013JB010573</doi><tpages>25</tpages><oa>free_for_read</oa></addata></record> |
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| ispartof | Journal of geophysical research. Biogeosciences, 2014-04, Vol.119 (4), p.3478-3502 |
| issn | 2169-9313 2169-8953 2169-9356 2169-8961 |
| language | eng |
| recordid | cdi_cristin_nora_10037_7584 |
| source | Wiley Online Library; NORA - Norwegian Open Research Archives; Wiley Online Library Journals Frontfile Complete; Alma/SFX Local Collection |
| subjects | Axial compression Brittle fracture Chemical analysis Compression Confining Continental crust Cracking (corrosion) Crystals Deformation deformation experiments Deformation mechanisms dissolution-precipitation Enhanced diffusion Feldspars Fracture mechanics fracturing Fragments Geochemistry Geophysics Homogenization Homogenizing Hydrostatics K-feldspar lower crust Melting Melts Pressure dependence Shear Shear zone Single crystals Solifluction Strain rate Stresses VDP |
| title | Semibrittle deformation and partial melting of perthitic K-feldspar: An experimental study |
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