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Petrogenetic re-examination of spinel + quartz assemblage in the Larsemann Hills, East Antarctica
https://nipr.repo.nii.ac.jp/records/16344
https://nipr.repo.nii.ac.jp/records/16344df53c117-dfe4-4103-b05c-a38993790d3c
Item type | 学術雑誌論文 / Journal Article(1) | |||||
---|---|---|---|---|---|---|
公開日 | 2020-11-26 | |||||
タイトル | ||||||
タイトル | Petrogenetic re-examination of spinel + quartz assemblage in the Larsemann Hills, East Antarctica | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Petrogenetic re-examination of spinel + quartz assemblage in the Larsemann Hills, East Antarctica | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Larsemann hills | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Spinel + quartz | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Monazite | |||||
キーワード | ||||||
言語 | en | |||||
主題Scheme | Other | |||||
主題 | Metastable contact | |||||
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 | journal article | |||||
アクセス権 | ||||||
アクセス権 | metadata only access | |||||
アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
著者 |
Bose, Sankar
× Bose, Sankar× Mondal, Arnob Kumar× Bakshi, Ashok Kumar× Jose, Jis Romal |
|||||
抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | We present textural evidence of spinel (low-Zn) and quartz from two samples of quartzofeldspathic rocks from the Larsemann Hills, East Antarctica. The present occurrence is unusual for the fact that the direct grain contact is preserved unlike most other occurrences where these two phases are separated by reaction products during retrograde and/or prograde metamorphic stages. Textural features further indicate that Ti-biotite was part of the prograde assemblage that underwent partial melting to produce spinel. The maximum temperature estimated from the rock is 870 °C. Monazite grains are abundant in the rock and these are mostly homogeneous in terms of U, Th and Pb distribution. In situ U–Th-total Pb EPMA data of these monazite yield a group age of 527 ± 8 Ma. Textural and geochronological data match with the second (M2) stage of metamorphism of the Larsemann Hills region as evident from the existing geological record. Although spinel and quartz was considered to be a part of peak M2 assemblage in earlier studies, preservation of their grain contact is enigmatic. We consider the grain contact metastable and its preservation possibly resulted from significant overstepping of cooling reaction due to fast reaction kinetics. | |||||
書誌情報 |
en : Polar Science 巻 26, p. 100588, 発行日 2020-12 |
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ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 18739652 | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | https://doi.org/10.1016/j.polar.2020.100588 | |||||
関連名称 | 10.1016/j.polar.2020.100588 |