Emplacement of the Rocche Rosse rhyolite lava flow (Lipari, Aeolian Islands).
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| Title: | Emplacement of the Rocche Rosse rhyolite lava flow (Lipari, Aeolian Islands). |
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| Authors: | Bullock, Liam A.1,2 liam.bullock@abdn.ac.uk, Gertisser, Ralf1, O’Driscoll, Brian1,3 |
| Source: | Bulletin of Volcanology. May2018, Vol. 80 Issue 5, p1-1. 1p. |
| Subject Terms: | *Emplacement (Geology), *Rhyolite, *Lava flows, *Soil crusting |
| Geographic Terms: | Lipari Islands (Italy) |
| Abstract: | The Rocche Rosse lava flow marks the most recent rhyolitic extrusion on Lipari island (Italy), and preserves evidence for a multi-stage emplacement history. Due to the viscous nature of the advancing lava (108 to 1010 Pa s), indicators of complex emplacement processes are preserved in the final flow. This study focuses on structural mapping of the flow to highlight the interplay of cooling, crust formation and underlying slope in the development of rhyolitic lavas. The flow is made up of two prominent lobes, small (< 0.2 m) to large (> 0.2 m) scale folding and a channelled geometry. Foliations dip at 2-4° over the flatter topography close to the vent, and up to 30-50° over steeper mid-flow topography. Brittle faults, tension gashes and conjugate fractures are also evident across flow. Heterogeneous deformation is evident through increasing fold asymmetry from the vent due to downflow cooling and stagnation. A steeper underlying topography mid-flow led to development of a channelled morphology, and compression at topographic breaks resulted in fold superimposition in the channel. We propose an emplacement history that involved the evolution through five stages, each associated with the following flow regimes: (1) initial extrusion, crustal development and small scale folding; (2) extensional strain, stretching lineations and channel development over steeper topography; (3) compression at topographic break, autobrecciation, lobe development and medium scale folding; (4) progressive deformation with stagnation, large-scale folding and re-folding; and (5) brittle deformation following flow termination. The complex array of structural elements observed within the Rocche Rosse lava flow facilitates comparisons to be made with actively deforming rhyolitic lava flows at the Chilean volcanoes of Chaitén and Cordón Caulle, offering a fluid dynamic and structural framework within which to evaluate our data. [ABSTRACT FROM AUTHOR] |
| Database: | Energy & Power Source |
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| Header | DbId: enr DbLabel: Energy & Power Source An: 129629442 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Emplacement of the Rocche Rosse rhyolite lava flow (Lipari, Aeolian Islands). – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Bullock%2C+Liam+A%2E%22">Bullock, Liam A.</searchLink><relatesTo>1,2</relatesTo><i> liam.bullock@abdn.ac.uk</i><br /><searchLink fieldCode="AR" term="%22Gertisser%2C+Ralf%22">Gertisser, Ralf</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22O’Driscoll%2C+Brian%22">O’Driscoll, Brian</searchLink><relatesTo>1,3</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Bulletin+of+Volcanology%22">Bulletin of Volcanology</searchLink>. May2018, Vol. 80 Issue 5, p1-1. 1p. – Name: Subject Label: Subject Terms Group: Su Data: *<searchLink fieldCode="DE" term="%22Emplacement+%28Geology%29%22">Emplacement (Geology)</searchLink><br />*<searchLink fieldCode="DE" term="%22Rhyolite%22">Rhyolite</searchLink><br />*<searchLink fieldCode="DE" term="%22Lava+flows%22">Lava flows</searchLink><br />*<searchLink fieldCode="DE" term="%22Soil+crusting%22">Soil crusting</searchLink> – Name: SubjectGeographic Label: Geographic Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Lipari+Islands+%28Italy%29%22">Lipari Islands (Italy)</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The Rocche Rosse lava flow marks the most recent rhyolitic extrusion on Lipari island (Italy), and preserves evidence for a multi-stage emplacement history. Due to the viscous nature of the advancing lava (108 to 1010 Pa s), indicators of complex emplacement processes are preserved in the final flow. This study focuses on structural mapping of the flow to highlight the interplay of cooling, crust formation and underlying slope in the development of rhyolitic lavas. The flow is made up of two prominent lobes, small (< 0.2 m) to large (> 0.2 m) scale folding and a channelled geometry. Foliations dip at 2-4° over the flatter topography close to the vent, and up to 30-50° over steeper mid-flow topography. Brittle faults, tension gashes and conjugate fractures are also evident across flow. Heterogeneous deformation is evident through increasing fold asymmetry from the vent due to downflow cooling and stagnation. A steeper underlying topography mid-flow led to development of a channelled morphology, and compression at topographic breaks resulted in fold superimposition in the channel. We propose an emplacement history that involved the evolution through five stages, each associated with the following flow regimes: (1) initial extrusion, crustal development and small scale folding; (2) extensional strain, stretching lineations and channel development over steeper topography; (3) compression at topographic break, autobrecciation, lobe development and medium scale folding; (4) progressive deformation with stagnation, large-scale folding and re-folding; and (5) brittle deformation following flow termination. The complex array of structural elements observed within the Rocche Rosse lava flow facilitates comparisons to be made with actively deforming rhyolitic lava flows at the Chilean volcanoes of Chaitén and Cordón Caulle, offering a fluid dynamic and structural framework within which to evaluate our data. [ABSTRACT FROM AUTHOR] |
| PLink | https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=enr&AN=129629442 |
| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1007/s00445-018-1222-4 Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 1 StartPage: 1 Subjects: – SubjectFull: Emplacement (Geology) Type: general – SubjectFull: Rhyolite Type: general – SubjectFull: Lava flows Type: general – SubjectFull: Soil crusting Type: general – SubjectFull: Lipari Islands (Italy) Type: general Titles: – TitleFull: Emplacement of the Rocche Rosse rhyolite lava flow (Lipari, Aeolian Islands). Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Bullock, Liam A. – PersonEntity: Name: NameFull: Gertisser, Ralf – PersonEntity: Name: NameFull: O’Driscoll, Brian IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 05 Text: May2018 Type: published Y: 2018 Identifiers: – Type: issn-print Value: 02588900 Numbering: – Type: volume Value: 80 – Type: issue Value: 5 Titles: – TitleFull: Bulletin of Volcanology Type: main |
| ResultId | 1 |
