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Samples : Isotopic ratios of eight samples were measured with a MAT 261 mass spectrometer at the Institute for Study of the Earth\u0027s Interior, Okayama University. Four samples are enderbites consisting of Opx, Cpx, Hbl, Bt, Pl and Qtz with or without Grt and Kfs (mineral abbreviations after R. KRETZ : Am. Mineral., 68,277,1983). These rocks were collected within a hundred meters of each other. The other four samples are hornblende gneisses as follows : Bt-Hbl-Pl, Bt-Hbl-Kfs-Pl-Qtz, Cpx-Hbl-Pl-Qtz and Bt-Hbl-Pl-Qtz. Two of them have been slightly altered to form secondary epidote and/or bluish green hornblende. All samples crop out within 500m. The peak metamorphic conditions of the enderbites were estimated from geothermobarometry to be 800℃ and 7-8.5kb (K. SHIRAISHI and S. KOJIMA : Proc. NIPR Symp. Antarct. Geosci., 1,129,1987). The hornblende gneisses were presumably metamorphosed under the same conditions. Rb-Sr data : The ^\u003c87\u003eRb/^\u003c86\u003eSr ratios for eight samples are low (0.02-0.15) and no meaningful isochron can be drawn due to the considerable scattering of the data. Four enderbites, however, define an isochron of 1167±127 Ma with initial ratio 0.7040. Sm-Nd data : The ^\u003c143\u003eNd/^\u003c144\u003eNd vs. ^\u003c147\u003eSm/^\u003c144\u003eNd ratios for all eight samples defined an isochron of 999±164 Ma with an initial ratio of 0.51158. The calculated uncertainty is high because the spread of the ^\u003c147\u003eSm/^\u003c144\u003eNd ratios is limited. T_\u003c(DM)\u003e model ages (ε_\u003cND(0)\u003e=+10) range between 1150 and 1300 Ma.Previous work has shown that the region was affected by a thermal event associated with plutonism about 500Ma ago. This event may be the cause of the scatter in the Rb-Sr data. 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PRELIMINARY GEOCHRONOLOGICAL STUDY OF GRANULITES FROM THE SØR RONDANE MOUNTAINS, EAST ANTARCTICA : A COMPARISON OF Rb-Sr AND Sm-Nd AGES
https://doi.org/10.15094/00002605
https://doi.org/10.15094/00002605151cb283-0ce1-4225-99bb-92455fa5bc6b
名前 / ファイル | ライセンス | アクション |
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KJ00002368195 (92.5 kB)
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Item type | 紀要論文(ELS) / Departmental Bulletin Paper(1) | |||||
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公開日 | 1989-09-01 | |||||
タイトル | ||||||
タイトル | PRELIMINARY GEOCHRONOLOGICAL STUDY OF GRANULITES FROM THE SØR RONDANE MOUNTAINS, EAST ANTARCTICA : A COMPARISON OF Rb-Sr AND Sm-Nd AGES | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | departmental bulletin paper | |||||
ID登録 | ||||||
ID登録 | 10.15094/00002605 | |||||
ID登録タイプ | JaLC | |||||
ページ属性 | ||||||
内容記述タイプ | Other | |||||
内容記述 | P(論文) | |||||
記事種別(英) | ||||||
en | ||||||
ABSTRACT | ||||||
著者名よみ |
シライシ, カズユキ
× シライシ, カズユキ× カガミ, ヒロオ |
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著者名(英) |
SHIRAISHI, Kazuyuki
× SHIRAISHI, Kazuyuki× KAGAMI, Hiroo |
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著者所属(英) | ||||||
en | ||||||
National Institute of Polar Research | ||||||
著者所属(英) | ||||||
en | ||||||
Intitute for Study of the Earth's Interior, Okayama University | ||||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | We report the preliminary results of whole-rock Rb-Sr and Sm-Nd isochrons dating on granulite-facies metamorphic rocks from Brattnipene, central Sør Rondane Mountains, East Antarctica. Samples : Isotopic ratios of eight samples were measured with a MAT 261 mass spectrometer at the Institute for Study of the Earth's Interior, Okayama University. Four samples are enderbites consisting of Opx, Cpx, Hbl, Bt, Pl and Qtz with or without Grt and Kfs (mineral abbreviations after R. KRETZ : Am. Mineral., 68,277,1983). These rocks were collected within a hundred meters of each other. The other four samples are hornblende gneisses as follows : Bt-Hbl-Pl, Bt-Hbl-Kfs-Pl-Qtz, Cpx-Hbl-Pl-Qtz and Bt-Hbl-Pl-Qtz. Two of them have been slightly altered to form secondary epidote and/or bluish green hornblende. All samples crop out within 500m. The peak metamorphic conditions of the enderbites were estimated from geothermobarometry to be 800℃ and 7-8.5kb (K. SHIRAISHI and S. KOJIMA : Proc. NIPR Symp. Antarct. Geosci., 1,129,1987). The hornblende gneisses were presumably metamorphosed under the same conditions. Rb-Sr data : The ^<87>Rb/^<86>Sr ratios for eight samples are low (0.02-0.15) and no meaningful isochron can be drawn due to the considerable scattering of the data. Four enderbites, however, define an isochron of 1167±127 Ma with initial ratio 0.7040. Sm-Nd data : The ^<143>Nd/^<144>Nd vs. ^<147>Sm/^<144>Nd ratios for all eight samples defined an isochron of 999±164 Ma with an initial ratio of 0.51158. The calculated uncertainty is high because the spread of the ^<147>Sm/^<144>Nd ratios is limited. T_<(DM)> model ages (ε_<ND(0)>=+10) range between 1150 and 1300 Ma.Previous work has shown that the region was affected by a thermal event associated with plutonism about 500Ma ago. This event may be the cause of the scatter in the Rb-Sr data. Nonetheless, four enderbites, which seem to be fresh under the microscope, yield a Rb-Sr isochron whose age is consistent with the Sm-Nd age within the uncertainties. There are two possible explanations for the 1000Ma ages : crust formation or metamorphism. We tentatively interpret the 1000Ma could date granulite-facies regional metamorphism although the Sm-Nd isochron age has been thought to date a crust formation because of the immobility of rare earth elements during metamorphism. Resetting of Sm-Nd whole-rock isochrons may have been possible under the estimated conditions of granulite-facies metamorphism as discussed for the Napier Complex of Enderby Land (M. T. McCULLOCH and L. P. BLACK : Earth Planet. Sci. Lett., 71,46,1984). | |||||
雑誌書誌ID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA1072335X | |||||
書誌情報 |
Proceedings of the NIPR Symposium on Antarctic Geosciences 巻 3, p. 152, 発行日 1989-09 |
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出版者 | ||||||
出版者 | National Institute of Polar Research |