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dc.contributor.author | KAWAKAMI, Tetsuo | en |
dc.contributor.author | HARLEY, Simon L. | en |
dc.contributor.alternative | 河上, 哲生 | ja |
dc.date.accessioned | 2024-03-15T00:17:12Z | - |
dc.date.available | 2024-03-15T00:17:12Z | - |
dc.date.issued | 2023 | - |
dc.identifier.uri | http://hdl.handle.net/2433/287371 | - |
dc.description.abstract | Boron isotope compositions were measured in kornerupine and tourmaline from lenses consisting primarily of kornerupine, plagioclase and corundum. The lenses occur within hornblende-gneiss or along the boundary between this gneiss and an amphibolite lens at Akarui Point in the Lützow-Holm Complex, Prince Olav Coast, East Antarctica. The peak metamorphic conditions have been estimated to be ∼ 800-900 °C and ∼ 8-11 kbar. The δ¹¹B compositions of kornerupine, which is interpreted to have been a stable phase at the metamorphic peak, are −11.6 ± 0.4 to −7.8 ± 0.5‰ and −9.8 ± 0.3 to −6.1 ± 0.2‰ in two different samples. Grains of prograde tourmaline included in kornerupine and corundum yielded δ¹¹B = −2.1 ± 0.3 to +0.6 ± 0.3‰, and the secondary tourmaline replacing kornerupine yielded δ¹¹B = −4.6 ± 0.2 to −3.7 ± 0.2‰. Therefore, the isotopic fractionation between kornerupine and tourmaline, Δ¹¹BTur-Krn (= δ¹¹BTur − δ¹¹BKrn), of the average prograde tourmaline and average host kornerupine is +6.7 ± 1.5‰, which is interpreted to indicate isotopic equilibrium at the metamorphic peak on the basis of previous studies of isotope fractionation between tourmaline and minerals of the kornerupine-prismatine series. The δ¹¹B values obtained on prograde tourmaline are between whole rock δ¹¹B of MORB and mantle rocks and of some sedimentary rocks, and are similar to the δ¹¹B of blackwall tourmalines that crystallized during the decompression stage following high-pressure metamorphism. We infer that the syn-metamorphic B-bearing fluid present in the kornerupine-plagioclase-corundum lens is likely sourced from a mixture of sedimentary, mafic and ultramafic lithologies in a subduction setting. The metabasic and meta-ultramafic lenses found in Akarui Point could be interpreted as the remnant of mixing zone of Ediacaran to Cambrian subduction channel. | en |
dc.language.iso | eng | - |
dc.publisher | Japan Association of Mineralogical Sciences | en |
dc.publisher.alternative | 日本鉱物科学会 | ja |
dc.rights | © 2023 Japan Association of Mineralogical Sciences | en |
dc.subject | Boron isotope | en |
dc.subject | Metamorphic fluid | en |
dc.subject | Tourmaline | en |
dc.subject | Continental collision | en |
dc.subject | Lower crust | en |
dc.title | Boron isotope compositions of coexisting kornerupine and tourmaline in high-grade metabasic rocks: an example from Akarui Point, Lützow-Holm Complex, East Antarctica | en |
dc.type | journal article | - |
dc.type.niitype | Journal Article | - |
dc.identifier.jtitle | Journal of Mineralogical and Petrological Sciences | en |
dc.identifier.volume | 118 | - |
dc.identifier.issue | ANTARCTICA | - |
dc.relation.doi | 10.2465/jmps.230131b | - |
dc.textversion | publisher | - |
dc.identifier.artnum | 230131b | - |
dcterms.accessRights | open access | - |
datacite.awardNumber | 26400513 | - |
datacite.awardNumber | 19H01991 | - |
datacite.awardNumber.uri | https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-26400513/ | - |
datacite.awardNumber.uri | https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-19H01991/ | - |
dc.identifier.pissn | 1345-6296 | - |
dc.identifier.eissn | 1349-3825 | - |
jpcoar.funderName | 日本学術振興会 | ja |
jpcoar.funderName | 日本学術振興会 | ja |
jpcoar.awardTitle | 大陸衝突帯における地殻内流体活動・部分溶融とそれに伴う物質移動の理解 | ja |
jpcoar.awardTitle | 大陸衝突帯下部地殻における塩水流体活動の実態解明 | ja |
出現コレクション: | 学術雑誌掲載論文等 |
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