Two-mica rhyolitic tephra in the East Pisco Basin (Peru): new age and dispersion constraints for the eruptions of the Eastern Cordillera of Central Andes.
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| Title: | Two-mica rhyolitic tephra in the East Pisco Basin (Peru): new age and dispersion constraints for the eruptions of the Eastern Cordillera of Central Andes. |
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| Authors: | Bosio, Giulia1,2 (AUTHOR) giulia.bosio.giulia@gmail.com, Gioncada, Anna1 (AUTHOR), Di Celma, Claudio3 (AUTHOR), Villa, Igor Maria2,4,5 (AUTHOR), Pichavant, Michel6 (AUTHOR), Urbina, Mario7 (AUTHOR), Bianucci, Giovanni1 (AUTHOR) |
| Source: | Bulletin of Volcanology. Jun2020, Vol. 82 Issue 6, p1-22. 22p. |
| Subject Terms: | *Volcanic ash, tuff, etc., *Volcanic eruptions, *Volcanology, *Biotite, *Feldspar, *Muscovite |
| Geographic Terms: | Andes |
| Abstract: | Two-mica—biotite and muscovite—volcanics are particularly rare in the geological record. One of the several dozen volcanic ash layers from Central Andes volcanoes found in the upper Miocene marine succession of the Pisco Formation (Ica Desert, Peru) contains juvenile biotite and muscovite, sillimanite/andalusite, feldspars, and rhyolitic glass. 39Ar–40Ar dating on biotite and muscovite concordantly constrain an age of 7.96 Ma for this two-mica ash layer. A second tephra in the Pisco Formation has a similar biotite composition and an age between 7.45 and 6.93 Ma. The peculiar mineral assemblage and the chemical composition of biotite indicate a strongly peraluminous composition of the erupted magmas and, together with the 39Ar–40Ar ages, suggest to consider a correlation of these ash layers to the eruptions of the Miocene Macusani (Peru) or Morococala (Bolivia) volcanic complexes in the Eastern Cordillera of Central Andes. The major and trace element composition of glass supports the correlation with Macusani. A provenance from Morococala seems less likely given the large distances involved. These results provide new data on the volcanic activity of the Eastern Cordillera revealing ash that dispersed to over 500 km to the west, in the forearc marine basins. This finding highlights that the exhumed forearc East Pisco Basin is highly promising as an archive of distal ash for the reconstruction of the volcanic activity of Central Andes during the Miocene silicic flare-ups. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
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| Header | DbId: enr DbLabel: Energy & Power Source An: 143892416 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Two-mica rhyolitic tephra in the East Pisco Basin (Peru): new age and dispersion constraints for the eruptions of the Eastern Cordillera of Central Andes. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Bosio%2C+Giulia%22">Bosio, Giulia</searchLink><relatesTo>1,2</relatesTo> (AUTHOR)<i> giulia.bosio.giulia@gmail.com</i><br /><searchLink fieldCode="AR" term="%22Gioncada%2C+Anna%22">Gioncada, Anna</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Di+Celma%2C+Claudio%22">Di Celma, Claudio</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Villa%2C+Igor+Maria%22">Villa, Igor Maria</searchLink><relatesTo>2,4,5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Pichavant%2C+Michel%22">Pichavant, Michel</searchLink><relatesTo>6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Urbina%2C+Mario%22">Urbina, Mario</searchLink><relatesTo>7</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Bianucci%2C+Giovanni%22">Bianucci, Giovanni</searchLink><relatesTo>1</relatesTo> (AUTHOR) – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Bulletin+of+Volcanology%22">Bulletin of Volcanology</searchLink>. Jun2020, Vol. 82 Issue 6, p1-22. 22p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Volcanic+ash%2C+tuff%2C+etc%2E%22">Volcanic ash, tuff, etc.</searchLink><br />*<searchLink fieldCode="DE" term="%22Volcanic+eruptions%22">Volcanic eruptions</searchLink><br />*<searchLink fieldCode="DE" term="%22Volcanology%22">Volcanology</searchLink><br />*<searchLink fieldCode="DE" term="%22Biotite%22">Biotite</searchLink><br />*<searchLink fieldCode="DE" term="%22Feldspar%22">Feldspar</searchLink><br />*<searchLink fieldCode="DE" term="%22Muscovite%22">Muscovite</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Andes%22">Andes</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: Two-mica—biotite and muscovite—volcanics are particularly rare in the geological record. One of the several dozen volcanic ash layers from Central Andes volcanoes found in the upper Miocene marine succession of the Pisco Formation (Ica Desert, Peru) contains juvenile biotite and muscovite, sillimanite/andalusite, feldspars, and rhyolitic glass. 39Ar–40Ar dating on biotite and muscovite concordantly constrain an age of 7.96 Ma for this two-mica ash layer. A second tephra in the Pisco Formation has a similar biotite composition and an age between 7.45 and 6.93 Ma. The peculiar mineral assemblage and the chemical composition of biotite indicate a strongly peraluminous composition of the erupted magmas and, together with the 39Ar–40Ar ages, suggest to consider a correlation of these ash layers to the eruptions of the Miocene Macusani (Peru) or Morococala (Bolivia) volcanic complexes in the Eastern Cordillera of Central Andes. The major and trace element composition of glass supports the correlation with Macusani. A provenance from Morococala seems less likely given the large distances involved. These results provide new data on the volcanic activity of the Eastern Cordillera revealing ash that dispersed to over 500 km to the west, in the forearc marine basins. This finding highlights that the exhumed forearc East Pisco Basin is highly promising as an archive of distal ash for the reconstruction of the volcanic activity of Central Andes during the Miocene silicic flare-ups. [ABSTRACT FROM AUTHOR] |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s00445-020-1373-y Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 22 StartPage: 1 Subjects: – SubjectFull: Volcanic ash, tuff, etc. Type: general – SubjectFull: Volcanic eruptions Type: general – SubjectFull: Volcanology Type: general – SubjectFull: Biotite Type: general – SubjectFull: Feldspar Type: general – SubjectFull: Muscovite Type: general – SubjectFull: Andes Type: general Titles: – TitleFull: Two-mica rhyolitic tephra in the East Pisco Basin (Peru): new age and dispersion constraints for the eruptions of the Eastern Cordillera of Central Andes. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Bosio, Giulia – PersonEntity: Name: NameFull: Gioncada, Anna – PersonEntity: Name: NameFull: Di Celma, Claudio – PersonEntity: Name: NameFull: Villa, Igor Maria – PersonEntity: Name: NameFull: Pichavant, Michel – PersonEntity: Name: NameFull: Urbina, Mario – PersonEntity: Name: NameFull: Bianucci, Giovanni IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 06 Text: Jun2020 Type: published Y: 2020 Identifiers: – Type: issn-print Value: 02588900 Numbering: – Type: volume Value: 82 – Type: issue Value: 6 Titles: – TitleFull: Bulletin of Volcanology Type: main |
| ResultId | 1 |
