The mechanism of cation and oxygen isotope exchange in alkali feldspars under hydrothermal conditions
The mechanism of re-equilibration of albite in a hydrothermal fluid has been investigated experimentally using natural albite crystals in an aqueous KCl solution enriched in 18 O at 600°C and 2 kbars pressure. The reaction is pseudomorphic and produces a rim of K-feldspar with a sharp interface on a...
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| Veröffentlicht in: | Contributions to mineralogy and petrology 2009-01, Vol.157 (1), p.65-76 |
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| creator | Niedermeier, Dominik R. D. Putnis, Andrew Geisler, Thorsten Golla-Schindler, Ute Putnis, Christine V. |
| description | The mechanism of re-equilibration of albite in a hydrothermal fluid has been investigated experimentally using natural albite crystals in an aqueous KCl solution enriched in
18
O at 600°C and 2 kbars pressure. The reaction is pseudomorphic and produces a rim of K-feldspar with a sharp interface on a nanoscale which moves into the parent albite with increasing reaction time. Transmission electron microscopy (TEM) diffraction contrast and X-ray powder diffraction (XRD) show that the K-feldspar has a very high defect concentration and a disordered Al, Si distribution, compared to the parent albite. Raman spectroscopy shows a frequency shift of the Si-O-Si bending vibration from ~476 cm
−1
in K-feldspar formed in normal
16
O aqueous solution to ~457 cm
−1
in the K-feldspar formed in
18
O-enriched solution, reflecting a mass-related frequency shift due to a high enrichment of
18
O in the K-feldspar silicate framework. Raman mapping of the spatial distribution of the frequency shift, and hence
18
O content, compared with major element distribution maps, show a 1:1 correspondence between the reaction rim formed by the replacement of albite by K-feldspar, and the oxygen isotope re-equilibration. The textural and chemical characteristics as well as the kinetics of the replacement of albite by K-feldspar are consistent with an interface-coupled dissolution-reprecipitation mechanism. |
| doi_str_mv | 10.1007/s00410-008-0320-2 |
| format | Article |
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18
O at 600°C and 2 kbars pressure. The reaction is pseudomorphic and produces a rim of K-feldspar with a sharp interface on a nanoscale which moves into the parent albite with increasing reaction time. Transmission electron microscopy (TEM) diffraction contrast and X-ray powder diffraction (XRD) show that the K-feldspar has a very high defect concentration and a disordered Al, Si distribution, compared to the parent albite. Raman spectroscopy shows a frequency shift of the Si-O-Si bending vibration from ~476 cm
−1
in K-feldspar formed in normal
16
O aqueous solution to ~457 cm
−1
in the K-feldspar formed in
18
O-enriched solution, reflecting a mass-related frequency shift due to a high enrichment of
18
O in the K-feldspar silicate framework. Raman mapping of the spatial distribution of the frequency shift, and hence
18
O content, compared with major element distribution maps, show a 1:1 correspondence between the reaction rim formed by the replacement of albite by K-feldspar, and the oxygen isotope re-equilibration. The textural and chemical characteristics as well as the kinetics of the replacement of albite by K-feldspar are consistent with an interface-coupled dissolution-reprecipitation mechanism.</description><identifier>ISSN: 0010-7999</identifier><identifier>EISSN: 1432-0967</identifier><identifier>DOI: 10.1007/s00410-008-0320-2</identifier><identifier>CODEN: CMPEAP</identifier><language>eng</language><publisher>Berlin/Heidelberg: Springer-Verlag</publisher><subject>Crystallography ; Crystals ; Earth and Environmental Science ; Earth Sciences ; Geology ; Isotopes ; Mineral Resources ; Mineralogy ; Original Paper ; Oxygen ; Oxygen isotopes ; Petrology ; Spatial distribution</subject><ispartof>Contributions to mineralogy and petrology, 2009-01, Vol.157 (1), p.65-76</ispartof><rights>Springer-Verlag 2008</rights><rights>Springer-Verlag 2009</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a404t-f2410fda9871d8dd7adc4e9fe9c2bc5ae19870530eaa5560ebc55ec3000083c73</citedby><cites>FETCH-LOGICAL-a404t-f2410fda9871d8dd7adc4e9fe9c2bc5ae19870530eaa5560ebc55ec3000083c73</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1007/s00410-008-0320-2$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1007/s00410-008-0320-2$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,780,784,27924,27925,41488,42557,51319</link.rule.ids></links><search><creatorcontrib>Niedermeier, Dominik R. D.</creatorcontrib><creatorcontrib>Putnis, Andrew</creatorcontrib><creatorcontrib>Geisler, Thorsten</creatorcontrib><creatorcontrib>Golla-Schindler, Ute</creatorcontrib><creatorcontrib>Putnis, Christine V.</creatorcontrib><title>The mechanism of cation and oxygen isotope exchange in alkali feldspars under hydrothermal conditions</title><title>Contributions to mineralogy and petrology</title><addtitle>Contrib Mineral Petrol</addtitle><description>The mechanism of re-equilibration of albite in a hydrothermal fluid has been investigated experimentally using natural albite crystals in an aqueous KCl solution enriched in
18
O at 600°C and 2 kbars pressure. The reaction is pseudomorphic and produces a rim of K-feldspar with a sharp interface on a nanoscale which moves into the parent albite with increasing reaction time. Transmission electron microscopy (TEM) diffraction contrast and X-ray powder diffraction (XRD) show that the K-feldspar has a very high defect concentration and a disordered Al, Si distribution, compared to the parent albite. Raman spectroscopy shows a frequency shift of the Si-O-Si bending vibration from ~476 cm
−1
in K-feldspar formed in normal
16
O aqueous solution to ~457 cm
−1
in the K-feldspar formed in
18
O-enriched solution, reflecting a mass-related frequency shift due to a high enrichment of
18
O in the K-feldspar silicate framework. Raman mapping of the spatial distribution of the frequency shift, and hence
18
O content, compared with major element distribution maps, show a 1:1 correspondence between the reaction rim formed by the replacement of albite by K-feldspar, and the oxygen isotope re-equilibration. 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D.</creatorcontrib><creatorcontrib>Putnis, Andrew</creatorcontrib><creatorcontrib>Geisler, Thorsten</creatorcontrib><creatorcontrib>Golla-Schindler, Ute</creatorcontrib><creatorcontrib>Putnis, Christine V.</creatorcontrib><collection>CrossRef</collection><collection>ProQuest Central (Corporate)</collection><collection>Oceanic Abstracts</collection><collection>ProQuest Central (purchase pre-March 2016)</collection><collection>Science Database (Alumni Edition)</collection><collection>ProQuest SciTech Collection</collection><collection>ProQuest Technology Collection</collection><collection>ProQuest Central (Alumni) (purchase pre-March 2016)</collection><collection>Research Library (Alumni Edition)</collection><collection>Materials Science & Engineering Collection</collection><collection>ProQuest Central (Alumni Edition)</collection><collection>ProQuest Central UK/Ireland</collection><collection>ProQuest Central Essentials</collection><collection>ProQuest Central</collection><collection>Technology Collection</collection><collection>Natural Science Collection</collection><collection>Earth, Atmospheric & Aquatic Science Collection</collection><collection>ProQuest One Community College</collection><collection>ProQuest Materials Science Collection</collection><collection>ProQuest Central Korea</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>ProQuest Central Student</collection><collection>Research Library Prep</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>SciTech Premium Collection</collection><collection>Materials Science Database</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>ProQuest Engineering Collection</collection><collection>Research Library</collection><collection>Science Database</collection><collection>Engineering Database</collection><collection>Research Library (Corporate)</collection><collection>Earth, Atmospheric & Aquatic Science Database</collection><collection>Materials Science Collection</collection><collection>ProQuest One Academic Eastern Edition (DO NOT USE)</collection><collection>ProQuest One Academic</collection><collection>ProQuest One Academic UKI Edition</collection><collection>Engineering Collection</collection><collection>ProQuest Central Basic</collection><collection>University of Michigan</collection><jtitle>Contributions to mineralogy and petrology</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Niedermeier, Dominik R. D.</au><au>Putnis, Andrew</au><au>Geisler, Thorsten</au><au>Golla-Schindler, Ute</au><au>Putnis, Christine V.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>The mechanism of cation and oxygen isotope exchange in alkali feldspars under hydrothermal conditions</atitle><jtitle>Contributions to mineralogy and petrology</jtitle><stitle>Contrib Mineral Petrol</stitle><date>2009-01-01</date><risdate>2009</risdate><volume>157</volume><issue>1</issue><spage>65</spage><epage>76</epage><pages>65-76</pages><issn>0010-7999</issn><eissn>1432-0967</eissn><coden>CMPEAP</coden><abstract>The mechanism of re-equilibration of albite in a hydrothermal fluid has been investigated experimentally using natural albite crystals in an aqueous KCl solution enriched in
18
O at 600°C and 2 kbars pressure. The reaction is pseudomorphic and produces a rim of K-feldspar with a sharp interface on a nanoscale which moves into the parent albite with increasing reaction time. Transmission electron microscopy (TEM) diffraction contrast and X-ray powder diffraction (XRD) show that the K-feldspar has a very high defect concentration and a disordered Al, Si distribution, compared to the parent albite. Raman spectroscopy shows a frequency shift of the Si-O-Si bending vibration from ~476 cm
−1
in K-feldspar formed in normal
16
O aqueous solution to ~457 cm
−1
in the K-feldspar formed in
18
O-enriched solution, reflecting a mass-related frequency shift due to a high enrichment of
18
O in the K-feldspar silicate framework. Raman mapping of the spatial distribution of the frequency shift, and hence
18
O content, compared with major element distribution maps, show a 1:1 correspondence between the reaction rim formed by the replacement of albite by K-feldspar, and the oxygen isotope re-equilibration. The textural and chemical characteristics as well as the kinetics of the replacement of albite by K-feldspar are consistent with an interface-coupled dissolution-reprecipitation mechanism.</abstract><cop>Berlin/Heidelberg</cop><pub>Springer-Verlag</pub><doi>10.1007/s00410-008-0320-2</doi><tpages>12</tpages></addata></record> |
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| subjects | Crystallography Crystals Earth and Environmental Science Earth Sciences Geology Isotopes Mineral Resources Mineralogy Original Paper Oxygen Oxygen isotopes Petrology Spatial distribution |
| title | The mechanism of cation and oxygen isotope exchange in alkali feldspars under hydrothermal conditions |
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