Cooling processes of a dolerite sill inferred from the variations in plagioclase aspect ratio, Atsumi District, north-eastern Japan.
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| Title: | Cooling processes of a dolerite sill inferred from the variations in plagioclase aspect ratio, Atsumi District, north-eastern Japan. |
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| Authors: | Kondo, Kentaro1 (AUTHOR), Hoshide, Takashi2 (AUTHOR) hoshide@gipc.akita-u.ac.jp |
| Source: | Geosciences Journal. Apr2022, Vol. 26 Issue 2, p183-199. 17p. |
| Subject Terms: | *Diabase, *Heat convection, *Plagioclase, *Olivine, *Zeolites, *Crystallization |
| Geographic Terms: | Japan |
| Abstract: | The upper Kayaoka sheet in the Atsumi area, Northeast Japan, has an alkaline-basaltic composition. The modal olivine and Ni enrichment in the lower part of the sheet indicates the accumulation of early formed olivine crystals. Overall, the average aspect ratio of plagioclase increases from the central part of the sheet toward both the top and bottom margins. The average aspect ratios of plagioclase and calculated crystallisation times at each height of the sheet, except for the lowermost margin, are roughly plotted near the regression line drawn based on those from many sills in previous research. However, we observed that the average aspect ratios of plagioclase in some horizons of the central part of the sheet exhibit an offset from the regression line. The olivine analcite dolerite in the central part of the sheet is rich in zeolite amygdules and glassy mesostasis with a quench texture. These observations suggest that the cooling rate in the central part of the sheet was faster compared with assuming conductive cooling only. A plausible mechanism for the rapid cooling at the centre of the sheet is heat transport by the convection of seawater that has infiltrated the columnar joint. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
| FullText | Links: – Type: pdflink Text: Availability: 0 |
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| Header | DbId: enr DbLabel: Energy & Power Source An: 155871469 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Cooling processes of a dolerite sill inferred from the variations in plagioclase aspect ratio, Atsumi District, north-eastern Japan. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Kondo%2C+Kentaro%22">Kondo, Kentaro</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hoshide%2C+Takashi%22">Hoshide, Takashi</searchLink><relatesTo>2</relatesTo> (AUTHOR)<i> hoshide@gipc.akita-u.ac.jp</i> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Geosciences+Journal%22">Geosciences Journal</searchLink>. Apr2022, Vol. 26 Issue 2, p183-199. 17p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Diabase%22">Diabase</searchLink><br />*<searchLink fieldCode="DE" term="%22Heat+convection%22">Heat convection</searchLink><br />*<searchLink fieldCode="DE" term="%22Plagioclase%22">Plagioclase</searchLink><br />*<searchLink fieldCode="DE" term="%22Olivine%22">Olivine</searchLink><br />*<searchLink fieldCode="DE" term="%22Zeolites%22">Zeolites</searchLink><br />*<searchLink fieldCode="DE" term="%22Crystallization%22">Crystallization</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Japan%22">Japan</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The upper Kayaoka sheet in the Atsumi area, Northeast Japan, has an alkaline-basaltic composition. The modal olivine and Ni enrichment in the lower part of the sheet indicates the accumulation of early formed olivine crystals. Overall, the average aspect ratio of plagioclase increases from the central part of the sheet toward both the top and bottom margins. The average aspect ratios of plagioclase and calculated crystallisation times at each height of the sheet, except for the lowermost margin, are roughly plotted near the regression line drawn based on those from many sills in previous research. However, we observed that the average aspect ratios of plagioclase in some horizons of the central part of the sheet exhibit an offset from the regression line. The olivine analcite dolerite in the central part of the sheet is rich in zeolite amygdules and glassy mesostasis with a quench texture. These observations suggest that the cooling rate in the central part of the sheet was faster compared with assuming conductive cooling only. A plausible mechanism for the rapid cooling at the centre of the sheet is heat transport by the convection of seawater that has infiltrated the columnar joint. [ABSTRACT FROM AUTHOR] |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s12303-021-0038-y Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 17 StartPage: 183 Subjects: – SubjectFull: Diabase Type: general – SubjectFull: Heat convection Type: general – SubjectFull: Plagioclase Type: general – SubjectFull: Olivine Type: general – SubjectFull: Zeolites Type: general – SubjectFull: Crystallization Type: general – SubjectFull: Japan Type: general Titles: – TitleFull: Cooling processes of a dolerite sill inferred from the variations in plagioclase aspect ratio, Atsumi District, north-eastern Japan. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Kondo, Kentaro – PersonEntity: Name: NameFull: Hoshide, Takashi IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 04 Text: Apr2022 Type: published Y: 2022 Identifiers: – Type: issn-print Value: 12264806 Numbering: – Type: volume Value: 26 – Type: issue Value: 2 Titles: – TitleFull: Geosciences Journal Type: main |
| ResultId | 1 |
