American Mineralogist, Volume 66, pages 1022_1033, IggI Surinagite, taaffeite, and heryllian sapphirine from pegmatites ingranulite-facies rocks of caJey Bay,Enderby Land, fntarctica
Surinamite, taaffeite, berylliaa sapphirine, niobian rutile, chrysoberyl, and wagnerite occurin sillimanite-rich, medium-grained segregations in two pegmaiites ofprobable late Archean age which cut granulite-facies.rocks near Mclntyre llaia-1erzz,s,4go05,E) in casey Bay,Antarctica. Antarctic surinam...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.567.1911 2023-05-15T13:53:03+02:00 American Mineralogist, Volume 66, pages 1022_1033, IggI Surinagite, taaffeite, and heryllian sapphirine from pegmatites ingranulite-facies rocks of caJey Bay,Enderby Land, fntarctica Eowano S. Gnew The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.567.1911 http://rruff.info/doclib/am/vol66/AM66_1022.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.567.1911 http://rruff.info/doclib/am/vol66/AM66_1022.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://rruff.info/doclib/am/vol66/AM66_1022.pdf text ftciteseerx 2016-01-08T12:18:55Z Surinamite, taaffeite, berylliaa sapphirine, niobian rutile, chrysoberyl, and wagnerite occurin sillimanite-rich, medium-grained segregations in two pegmaiites ofprobable late Archean age which cut granulite-facies.rocks near Mclntyre llaia-1erzz,s,4go05,E) in casey Bay,Antarctica. Antarctic surinamite contains 30.9-32.1 wt.za sior, 33.7-37.3 wt.vo Alror,9.i-l3'4 wt.Eo Feo, 0.01-0.2 wt.vo Mro, and 16.4-1g.4 wt.vo Mgo,0.5-r wt.vo Be, and 0.66+0.2 wt'Vo H2O. Assuming water is absent, a constant BeO content of 3.5 wt.Vo, and possible Fe3*for Al substitution, surinamite analyses recast to 32 oxygens contain 22 cations. Antarctic taafeite conrains 68.5-69.3,xt.vo A12o3,9.7 w.vo Feo, 10.6-11.0 wr. % Mgo, 4.7-5.2 wt.vo zno, and ' 0.5-l wt. % Be. cell parameters sre a:5.6g04 (2)A, c: +t.tC4-(zt1,,"gg"r,;g that this taaffeite is the gR polyrype. sapphirine contains zo.i wt.co sio2, 5 l. l wt.vo Airor ani 9:-l Y.E " Be, indicating substitution of Be for Al: Be + Si: 2Al. Associared garnet contains33 to 42 mole vo pyrope and associated cordierite, I wt.7a NarO. Stable mineral assemblagesin the segregations at the time the pegrnatites crystallized are quartz-sillimanite-surinamite-biotite-orthopyroxene-garnet, quartz-surinamite-taafeite, sillimanite-garnet-biotite-su-rinamite-taaffeite-sapphirine, and siltim4nite-garnet-biotite-chrysoberyl_surinamite. Tem_peratures and pressures at the time of pegmalils emplacement are estimated to have been800-900"c and 7-8 kbar. The Archean beryllian pegmatites are interpreted to be of mag-matic origin and may be related to charnockitic plutonic rocks such as the body exposed &Tange Promontory 70 km to the west. Text Antarc* Antarctic Antarctica Casey Bay Enderby Land Unknown Antarctic Casey Bay ENVELOPE(48.000,48.000,-67.500,-67.500) Tange Promontory ENVELOPE(46.750,46.750,-67.450,-67.450) |
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ftciteseerx |
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English |
description |
Surinamite, taaffeite, berylliaa sapphirine, niobian rutile, chrysoberyl, and wagnerite occurin sillimanite-rich, medium-grained segregations in two pegmaiites ofprobable late Archean age which cut granulite-facies.rocks near Mclntyre llaia-1erzz,s,4go05,E) in casey Bay,Antarctica. Antarctic surinamite contains 30.9-32.1 wt.za sior, 33.7-37.3 wt.vo Alror,9.i-l3'4 wt.Eo Feo, 0.01-0.2 wt.vo Mro, and 16.4-1g.4 wt.vo Mgo,0.5-r wt.vo Be, and 0.66+0.2 wt'Vo H2O. Assuming water is absent, a constant BeO content of 3.5 wt.Vo, and possible Fe3*for Al substitution, surinamite analyses recast to 32 oxygens contain 22 cations. Antarctic taafeite conrains 68.5-69.3,xt.vo A12o3,9.7 w.vo Feo, 10.6-11.0 wr. % Mgo, 4.7-5.2 wt.vo zno, and ' 0.5-l wt. % Be. cell parameters sre a:5.6g04 (2)A, c: +t.tC4-(zt1,,"gg"r,;g that this taaffeite is the gR polyrype. sapphirine contains zo.i wt.co sio2, 5 l. l wt.vo Airor ani 9:-l Y.E " Be, indicating substitution of Be for Al: Be + Si: 2Al. Associared garnet contains33 to 42 mole vo pyrope and associated cordierite, I wt.7a NarO. Stable mineral assemblagesin the segregations at the time the pegrnatites crystallized are quartz-sillimanite-surinamite-biotite-orthopyroxene-garnet, quartz-surinamite-taafeite, sillimanite-garnet-biotite-su-rinamite-taaffeite-sapphirine, and siltim4nite-garnet-biotite-chrysoberyl_surinamite. Tem_peratures and pressures at the time of pegmalils emplacement are estimated to have been800-900"c and 7-8 kbar. The Archean beryllian pegmatites are interpreted to be of mag-matic origin and may be related to charnockitic plutonic rocks such as the body exposed &Tange Promontory 70 km to the west. |
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Eowano S. Gnew |
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Eowano S. Gnew American Mineralogist, Volume 66, pages 1022_1033, IggI Surinagite, taaffeite, and heryllian sapphirine from pegmatites ingranulite-facies rocks of caJey Bay,Enderby Land, fntarctica |
author_facet |
Eowano S. Gnew |
author_sort |
Eowano S. Gnew |
title |
American Mineralogist, Volume 66, pages 1022_1033, IggI Surinagite, taaffeite, and heryllian sapphirine from pegmatites ingranulite-facies rocks of caJey Bay,Enderby Land, fntarctica |
title_short |
American Mineralogist, Volume 66, pages 1022_1033, IggI Surinagite, taaffeite, and heryllian sapphirine from pegmatites ingranulite-facies rocks of caJey Bay,Enderby Land, fntarctica |
title_full |
American Mineralogist, Volume 66, pages 1022_1033, IggI Surinagite, taaffeite, and heryllian sapphirine from pegmatites ingranulite-facies rocks of caJey Bay,Enderby Land, fntarctica |
title_fullStr |
American Mineralogist, Volume 66, pages 1022_1033, IggI Surinagite, taaffeite, and heryllian sapphirine from pegmatites ingranulite-facies rocks of caJey Bay,Enderby Land, fntarctica |
title_full_unstemmed |
American Mineralogist, Volume 66, pages 1022_1033, IggI Surinagite, taaffeite, and heryllian sapphirine from pegmatites ingranulite-facies rocks of caJey Bay,Enderby Land, fntarctica |
title_sort |
american mineralogist, volume 66, pages 1022_1033, iggi surinagite, taaffeite, and heryllian sapphirine from pegmatites ingranulite-facies rocks of cajey bay,enderby land, fntarctica |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.567.1911 http://rruff.info/doclib/am/vol66/AM66_1022.pdf |
long_lat |
ENVELOPE(48.000,48.000,-67.500,-67.500) ENVELOPE(46.750,46.750,-67.450,-67.450) |
geographic |
Antarctic Casey Bay Tange Promontory |
geographic_facet |
Antarctic Casey Bay Tange Promontory |
genre |
Antarc* Antarctic Antarctica Casey Bay Enderby Land |
genre_facet |
Antarc* Antarctic Antarctica Casey Bay Enderby Land |
op_source |
http://rruff.info/doclib/am/vol66/AM66_1022.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.567.1911 http://rruff.info/doclib/am/vol66/AM66_1022.pdf |
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1766258015900532736 |