Insights into the Subduction of the Ligure-Piemontese Oceanic Basin: New Constraints from the Metamorphism in the Internal Ligurian Units (Northern Apennines, Italy)
In the Northern Apennines, the Internal Ligurian Units are considered deformed and metamorphosed fragments of the Ligure-Piemontese oceanic basin. In this paper, we report on the temperature and pressure conditions of the metamorphic peak for four Internal Ligurian Units, estimated using different g...
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| Format: | Article |
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MDPI AG
2024-01-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/14/1/64 |
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| author | Edoardo Sanità Maria Di Rosa Michele Marroni Francesca Meneghini Luca Pandolfi |
| author_facet | Edoardo Sanità Maria Di Rosa Michele Marroni Francesca Meneghini Luca Pandolfi |
| author_sort | Edoardo Sanità |
| collection | DOAJ |
| description | In the Northern Apennines, the Internal Ligurian Units are considered deformed and metamorphosed fragments of the Ligure-Piemontese oceanic basin. In this paper, we report on the temperature and pressure conditions of the metamorphic peak for four Internal Ligurian Units, estimated using different geothermometers and geobarometers based on the white mica and chlorite compositions. These minerals were formed during the D1 deformation phase in the pre-Oligocene. The results indicate that the Portello and Gottero units are both characterized by metamorphic conditions pertaining to low blueschists facies, while the Colli-Tavarone and Bracco-Val Graveglia Units show a lower metamorphic imprint that produces assemblages of prehnite-pumpellyite facies. The estimated geothermal gradient for the metamorphic peak achieved by the analyzed Internal Ligurian Units during the D1 phase is 7–15 °C/Km, which is indicative of deformation in a subduction setting. Under these conditions, the D1 phase developed in these units as a result of underplating at the base of the accretionary wedge during the closure of the Ligure-Piemontese basin. These data indicate a close geodynamic correlation among the Internal Ligurian Units and the ophiolite-bearing units of the Alps. |
| first_indexed | 2024-03-08T10:39:12Z |
| format | Article |
| id | doaj.art-3f6bfaa06e1a40b58e1b583f247f9d4d |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-03-08T10:39:12Z |
| publishDate | 2024-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-3f6bfaa06e1a40b58e1b583f247f9d4d2024-01-26T17:52:27ZengMDPI AGMinerals2075-163X2024-01-011416410.3390/min14010064Insights into the Subduction of the Ligure-Piemontese Oceanic Basin: New Constraints from the Metamorphism in the Internal Ligurian Units (Northern Apennines, Italy)Edoardo Sanità0Maria Di Rosa1Michele Marroni2Francesca Meneghini3Luca Pandolfi4Dipartimento di Scienze della Terra, Università di Pisa, Via Santa Maria 53, 56126 Pisa, ItalyDipartimento di Scienze della Terra, Università di Pisa, Via Santa Maria 53, 56126 Pisa, ItalyDipartimento di Scienze della Terra, Università di Pisa, Via Santa Maria 53, 56126 Pisa, ItalyDipartimento di Scienze della Terra, Università di Pisa, Via Santa Maria 53, 56126 Pisa, ItalyDipartimento di Scienze della Terra, Università di Pisa, Via Santa Maria 53, 56126 Pisa, ItalyIn the Northern Apennines, the Internal Ligurian Units are considered deformed and metamorphosed fragments of the Ligure-Piemontese oceanic basin. In this paper, we report on the temperature and pressure conditions of the metamorphic peak for four Internal Ligurian Units, estimated using different geothermometers and geobarometers based on the white mica and chlorite compositions. These minerals were formed during the D1 deformation phase in the pre-Oligocene. The results indicate that the Portello and Gottero units are both characterized by metamorphic conditions pertaining to low blueschists facies, while the Colli-Tavarone and Bracco-Val Graveglia Units show a lower metamorphic imprint that produces assemblages of prehnite-pumpellyite facies. The estimated geothermal gradient for the metamorphic peak achieved by the analyzed Internal Ligurian Units during the D1 phase is 7–15 °C/Km, which is indicative of deformation in a subduction setting. Under these conditions, the D1 phase developed in these units as a result of underplating at the base of the accretionary wedge during the closure of the Ligure-Piemontese basin. These data indicate a close geodynamic correlation among the Internal Ligurian Units and the ophiolite-bearing units of the Alps.https://www.mdpi.com/2075-163X/14/1/64Northern ApenninesInternal Ligurian Unitshigh pressure metamorphismLigure-Piemontese oceansubduction |
| spellingShingle | Edoardo Sanità Maria Di Rosa Michele Marroni Francesca Meneghini Luca Pandolfi Insights into the Subduction of the Ligure-Piemontese Oceanic Basin: New Constraints from the Metamorphism in the Internal Ligurian Units (Northern Apennines, Italy) Minerals Northern Apennines Internal Ligurian Units high pressure metamorphism Ligure-Piemontese ocean subduction |
| title | Insights into the Subduction of the Ligure-Piemontese Oceanic Basin: New Constraints from the Metamorphism in the Internal Ligurian Units (Northern Apennines, Italy) |
| title_full | Insights into the Subduction of the Ligure-Piemontese Oceanic Basin: New Constraints from the Metamorphism in the Internal Ligurian Units (Northern Apennines, Italy) |
| title_fullStr | Insights into the Subduction of the Ligure-Piemontese Oceanic Basin: New Constraints from the Metamorphism in the Internal Ligurian Units (Northern Apennines, Italy) |
| title_full_unstemmed | Insights into the Subduction of the Ligure-Piemontese Oceanic Basin: New Constraints from the Metamorphism in the Internal Ligurian Units (Northern Apennines, Italy) |
| title_short | Insights into the Subduction of the Ligure-Piemontese Oceanic Basin: New Constraints from the Metamorphism in the Internal Ligurian Units (Northern Apennines, Italy) |
| title_sort | insights into the subduction of the ligure piemontese oceanic basin new constraints from the metamorphism in the internal ligurian units northern apennines italy |
| topic | Northern Apennines Internal Ligurian Units high pressure metamorphism Ligure-Piemontese ocean subduction |
| url | https://www.mdpi.com/2075-163X/14/1/64 |
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