Evolution of the magma system of Pantelleria (Italy) from 190 ka to present
The eruptive history of Pantelleria has been marked by the eruption of nine peralkaline ignimbrites, with inter-ignimbrite episodes from small, local volcanic centres. New whole-rock geochemical data are presented for seven ignimbrites and used with published data for younger units to track composit...
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| Format: | Article |
| Language: | English |
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Académie des sciences
2021-03-01
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| Series: | Comptes Rendus. Géoscience |
| Subjects: | |
| Online Access: | https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.50/ |
| _version_ | 1827785065441001472 |
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| author | Jordan, Nina J. White, John C. Macdonald, Ray Rotolo, Silvio G. |
| author_facet | Jordan, Nina J. White, John C. Macdonald, Ray Rotolo, Silvio G. |
| author_sort | Jordan, Nina J. |
| collection | DOAJ |
| description | The eruptive history of Pantelleria has been marked by the eruption of nine peralkaline ignimbrites, with inter-ignimbrite episodes from small, local volcanic centres. New whole-rock geochemical data are presented for seven ignimbrites and used with published data for younger units to track compositional changes with time. From ${\sim }190$ ka, silicic magmatism was dominated by comenditic trachyte to comendite compositions, evolving along generally similar liquid lines of descent (LLOD). The final ignimbrite, the Green Tuff (${\sim }46$ ka), was tapped from a compositionally zoned pantelleritic upper reservoir to a trachytic mush zone. Younger (20–7 ka) silicic magmatism has been relatively small scale, with compositions similar to the earliest pre-Green Tuff pantelleritic ignimbrite (Zinedi). These data suggest that the comenditic reservoirs may have been emplaced at deeper levels than the pantelleritic reservoirs. While both types of series evolved along similar LLOD dominated by fractionation of alkali feldspar, it is the fractionation of iron that determines whether comendite or pantellerite is produced. The deeper reservoirs were more oxidizing and wetter, thus leading to the crystallization of magnetite and therefore the fractionation of iron. |
| first_indexed | 2024-03-11T16:13:55Z |
| format | Article |
| id | doaj.art-17e03c6d13164c4cb81674eeb83eef32 |
| institution | Directory Open Access Journal |
| issn | 1778-7025 |
| language | English |
| last_indexed | 2024-03-11T16:13:55Z |
| publishDate | 2021-03-01 |
| publisher | Académie des sciences |
| record_format | Article |
| series | Comptes Rendus. Géoscience |
| spelling | doaj.art-17e03c6d13164c4cb81674eeb83eef322023-10-24T14:24:20ZengAcadémie des sciencesComptes Rendus. Géoscience1778-70252021-03-01353S213314910.5802/crgeos.5010.5802/crgeos.50Evolution of the magma system of Pantelleria (Italy) from 190 ka to presentJordan, Nina J.0https://orcid.org/0000-0002-6583-4925White, John C.1https://orcid.org/0000-0001-5107-6847Macdonald, Ray2Rotolo, Silvio G.3https://orcid.org/0000-0001-7523-1338School of Geography, Geology and the Environment, University of Leicester, University Road, Leicester LE1 7RH, UKDepartment of Geosciences, Eastern Kentucky University, 521 Lancaster Avenue, Richmond KY 40475, USAEnvironment Centre, Lancaster University, Lancaster LA1 4YQ, UK; IGMiP, Faculty of Geology, University of Warsaw, al. Zwirki i Wigury 93, 02-089 Warszawa, PolandDipartimento di Scienze della Terra e del Mare, Università di Palermo, Via Archirafi 36, 90123 Palermo, Italy; INGV - Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Palermo, ItalyThe eruptive history of Pantelleria has been marked by the eruption of nine peralkaline ignimbrites, with inter-ignimbrite episodes from small, local volcanic centres. New whole-rock geochemical data are presented for seven ignimbrites and used with published data for younger units to track compositional changes with time. From ${\sim }190$ ka, silicic magmatism was dominated by comenditic trachyte to comendite compositions, evolving along generally similar liquid lines of descent (LLOD). The final ignimbrite, the Green Tuff (${\sim }46$ ka), was tapped from a compositionally zoned pantelleritic upper reservoir to a trachytic mush zone. Younger (20–7 ka) silicic magmatism has been relatively small scale, with compositions similar to the earliest pre-Green Tuff pantelleritic ignimbrite (Zinedi). These data suggest that the comenditic reservoirs may have been emplaced at deeper levels than the pantelleritic reservoirs. While both types of series evolved along similar LLOD dominated by fractionation of alkali feldspar, it is the fractionation of iron that determines whether comendite or pantellerite is produced. The deeper reservoirs were more oxidizing and wetter, thus leading to the crystallization of magnetite and therefore the fractionation of iron.https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.50/PantelleriaIgnimbriteMagma reservoirsCompositional changes with timeComenditePantellerite |
| spellingShingle | Jordan, Nina J. White, John C. Macdonald, Ray Rotolo, Silvio G. Evolution of the magma system of Pantelleria (Italy) from 190 ka to present Comptes Rendus. Géoscience Pantelleria Ignimbrite Magma reservoirs Compositional changes with time Comendite Pantellerite |
| title | Evolution of the magma system of Pantelleria (Italy) from 190 ka to present |
| title_full | Evolution of the magma system of Pantelleria (Italy) from 190 ka to present |
| title_fullStr | Evolution of the magma system of Pantelleria (Italy) from 190 ka to present |
| title_full_unstemmed | Evolution of the magma system of Pantelleria (Italy) from 190 ka to present |
| title_short | Evolution of the magma system of Pantelleria (Italy) from 190 ka to present |
| title_sort | evolution of the magma system of pantelleria italy from 190 ka to present |
| topic | Pantelleria Ignimbrite Magma reservoirs Compositional changes with time Comendite Pantellerite |
| url | https://comptes-rendus.academie-sciences.fr/geoscience/articles/10.5802/crgeos.50/ |
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