Oxygen isotope speedometry in granulite facies garnet recording fluid/melt-rock interaction (Sør Rondane Mountains, East Antarctica)
In situ analysis of a garnet porphyroblast from a granulite facies gneiss from Sør Rondane Mountains, East Antarctica, reveals discontinuous step‐wise zoning in phosphorus and large δ18O variations from the phosphorus‐rich core to the phosphorus‐ poor rim. The gradually decreasing profile of oxygen...
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ftdatacite:10.7892/boris.138579 2023-05-15T13:42:08+02:00 Oxygen isotope speedometry in granulite facies garnet recording fluid/melt-rock interaction (Sør Rondane Mountains, East Antarctica) Higashino, Fumiko Rubatto, Daniela Kawakami, Tetsuo Bouvier, Anne-Sophie Baumgartner, Lukas P. 2019 application/pdf https://dx.doi.org/10.7892/boris.138579 https://boris.unibe.ch/138579/ en eng Wiley info:eu-repo/semantics/restrictedAccess 550 Earth sciences & geology Text article-journal ScholarlyArticle 2019 ftdatacite https://doi.org/10.7892/boris.138579 2021-11-05T12:55:41Z In situ analysis of a garnet porphyroblast from a granulite facies gneiss from Sør Rondane Mountains, East Antarctica, reveals discontinuous step‐wise zoning in phosphorus and large δ18O variations from the phosphorus‐rich core to the phosphorus‐ poor rim. The gradually decreasing profile of oxygen isotope from the core (δ18O = ~15‰) to the rim (δ18O = ~11‰) suggests that the 18O/16O zoning was originally step‐wise, and modified by diffusion after the garnet rim formation at ~800°C and 0.8 GPa. Fitting of the 18O/16O data to the diffusion equation constrains a duration of the high‐T event (~800°C) to c. 0.5–40 Ma after the garnet rim formation. The low δ18O value of the garnet rim, together with the previously reported low δ18O values in metacarbonates, indicates regional infiltration, probably along a detachment fault, of low δ18O fluid/melt possibly derived from meta‐mafic to ultramafic rocks. Text Antarc* Antarctica East Antarctica DataCite Metadata Store (German National Library of Science and Technology) East Antarctica Sør-Rondane ENVELOPE(25.000,25.000,-72.000,-72.000) Sør Rondane Mountains ENVELOPE(25.000,25.000,-72.000,-72.000) |
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Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
English |
topic |
550 Earth sciences & geology |
spellingShingle |
550 Earth sciences & geology Higashino, Fumiko Rubatto, Daniela Kawakami, Tetsuo Bouvier, Anne-Sophie Baumgartner, Lukas P. Oxygen isotope speedometry in granulite facies garnet recording fluid/melt-rock interaction (Sør Rondane Mountains, East Antarctica) |
topic_facet |
550 Earth sciences & geology |
description |
In situ analysis of a garnet porphyroblast from a granulite facies gneiss from Sør Rondane Mountains, East Antarctica, reveals discontinuous step‐wise zoning in phosphorus and large δ18O variations from the phosphorus‐rich core to the phosphorus‐ poor rim. The gradually decreasing profile of oxygen isotope from the core (δ18O = ~15‰) to the rim (δ18O = ~11‰) suggests that the 18O/16O zoning was originally step‐wise, and modified by diffusion after the garnet rim formation at ~800°C and 0.8 GPa. Fitting of the 18O/16O data to the diffusion equation constrains a duration of the high‐T event (~800°C) to c. 0.5–40 Ma after the garnet rim formation. The low δ18O value of the garnet rim, together with the previously reported low δ18O values in metacarbonates, indicates regional infiltration, probably along a detachment fault, of low δ18O fluid/melt possibly derived from meta‐mafic to ultramafic rocks. |
format |
Text |
author |
Higashino, Fumiko Rubatto, Daniela Kawakami, Tetsuo Bouvier, Anne-Sophie Baumgartner, Lukas P. |
author_facet |
Higashino, Fumiko Rubatto, Daniela Kawakami, Tetsuo Bouvier, Anne-Sophie Baumgartner, Lukas P. |
author_sort |
Higashino, Fumiko |
title |
Oxygen isotope speedometry in granulite facies garnet recording fluid/melt-rock interaction (Sør Rondane Mountains, East Antarctica) |
title_short |
Oxygen isotope speedometry in granulite facies garnet recording fluid/melt-rock interaction (Sør Rondane Mountains, East Antarctica) |
title_full |
Oxygen isotope speedometry in granulite facies garnet recording fluid/melt-rock interaction (Sør Rondane Mountains, East Antarctica) |
title_fullStr |
Oxygen isotope speedometry in granulite facies garnet recording fluid/melt-rock interaction (Sør Rondane Mountains, East Antarctica) |
title_full_unstemmed |
Oxygen isotope speedometry in granulite facies garnet recording fluid/melt-rock interaction (Sør Rondane Mountains, East Antarctica) |
title_sort |
oxygen isotope speedometry in granulite facies garnet recording fluid/melt-rock interaction (sør rondane mountains, east antarctica) |
publisher |
Wiley |
publishDate |
2019 |
url |
https://dx.doi.org/10.7892/boris.138579 https://boris.unibe.ch/138579/ |
long_lat |
ENVELOPE(25.000,25.000,-72.000,-72.000) ENVELOPE(25.000,25.000,-72.000,-72.000) |
geographic |
East Antarctica Sør-Rondane Sør Rondane Mountains |
geographic_facet |
East Antarctica Sør-Rondane Sør Rondane Mountains |
genre |
Antarc* Antarctica East Antarctica |
genre_facet |
Antarc* Antarctica East Antarctica |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.7892/boris.138579 |
_version_ |
1766162937015173120 |