A New Magma Type in the Continental Collision Zone. The Case of Capraia Island (Tuscany, Italy)
The Tuscany Magmatic Province consists of a Miocene to Pleistocene association of a wide variety of rock types, including peraluminous crustal anatectic granites and rhyolites, calcalkaline and shoshonitic suites and ultrapotassic lamproites. In addition to the magma types already recognised, the oc...
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MDPI AG
2021-02-01
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| Series: | Geosciences |
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| Online Access: | https://www.mdpi.com/2076-3263/11/2/104 |
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| author | Alba Patrizia Santo |
| author_facet | Alba Patrizia Santo |
| author_sort | Alba Patrizia Santo |
| collection | DOAJ |
| description | The Tuscany Magmatic Province consists of a Miocene to Pleistocene association of a wide variety of rock types, including peraluminous crustal anatectic granites and rhyolites, calcalkaline and shoshonitic suites and ultrapotassic lamproites. In addition to the magma types already recognised, the occurrence of a new, distinct magma type at Capraia and Elba islands and in mafic enclaves in the San Vincenzo rhyolites has been suggested by recent studies. This particular type of magma, represented by intermediate to acidic calcalkaline rocks showing high Sr, Ba, and LREE, is restricted to the northwestern sector of the province and to a time interval of about 8 to 4.5 Ma. New data obtained on rocks from Capraia Island have allowed for the verification of the occurrence of this new magma type, the exploration of its origin and a discussion of its possible geodynamic significance. The high-Sr-Ba andesite-dacite rocks occurring in the Laghetto area at Capraia display a composition that is intermediate between adakitic and calcalkaline rocks. It is suggested that they represent a distinct type of magma that originated at mantle pressure by melting of the lower continental crust, followed by mixing with other Capraia magmas. The geodynamic model that best explains the composition of the studied rocks is the thickening of the continental crust during continental collision, followed by extension that favoured melting of the lower crust. |
| first_indexed | 2024-03-09T00:41:05Z |
| format | Article |
| id | doaj.art-e31eabb7c9a94c069156f535f8898c90 |
| institution | Directory Open Access Journal |
| issn | 2076-3263 |
| language | English |
| last_indexed | 2024-03-09T00:41:05Z |
| publishDate | 2021-02-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Geosciences |
| spelling | doaj.art-e31eabb7c9a94c069156f535f8898c902023-12-11T17:50:04ZengMDPI AGGeosciences2076-32632021-02-0111210410.3390/geosciences11020104A New Magma Type in the Continental Collision Zone. The Case of Capraia Island (Tuscany, Italy)Alba Patrizia Santo0Department of Earth Sciences, University of Florence, Via A. La Pira 4, 50121 Florence, ItalyThe Tuscany Magmatic Province consists of a Miocene to Pleistocene association of a wide variety of rock types, including peraluminous crustal anatectic granites and rhyolites, calcalkaline and shoshonitic suites and ultrapotassic lamproites. In addition to the magma types already recognised, the occurrence of a new, distinct magma type at Capraia and Elba islands and in mafic enclaves in the San Vincenzo rhyolites has been suggested by recent studies. This particular type of magma, represented by intermediate to acidic calcalkaline rocks showing high Sr, Ba, and LREE, is restricted to the northwestern sector of the province and to a time interval of about 8 to 4.5 Ma. New data obtained on rocks from Capraia Island have allowed for the verification of the occurrence of this new magma type, the exploration of its origin and a discussion of its possible geodynamic significance. The high-Sr-Ba andesite-dacite rocks occurring in the Laghetto area at Capraia display a composition that is intermediate between adakitic and calcalkaline rocks. It is suggested that they represent a distinct type of magma that originated at mantle pressure by melting of the lower continental crust, followed by mixing with other Capraia magmas. The geodynamic model that best explains the composition of the studied rocks is the thickening of the continental crust during continental collision, followed by extension that favoured melting of the lower crust.https://www.mdpi.com/2076-3263/11/2/104Capraia Islandadakitic rockslower continental crustmeltingcontinental collision |
| spellingShingle | Alba Patrizia Santo A New Magma Type in the Continental Collision Zone. The Case of Capraia Island (Tuscany, Italy) Geosciences Capraia Island adakitic rocks lower continental crust melting continental collision |
| title | A New Magma Type in the Continental Collision Zone. The Case of Capraia Island (Tuscany, Italy) |
| title_full | A New Magma Type in the Continental Collision Zone. The Case of Capraia Island (Tuscany, Italy) |
| title_fullStr | A New Magma Type in the Continental Collision Zone. The Case of Capraia Island (Tuscany, Italy) |
| title_full_unstemmed | A New Magma Type in the Continental Collision Zone. The Case of Capraia Island (Tuscany, Italy) |
| title_short | A New Magma Type in the Continental Collision Zone. The Case of Capraia Island (Tuscany, Italy) |
| title_sort | new magma type in the continental collision zone the case of capraia island tuscany italy |
| topic | Capraia Island adakitic rocks lower continental crust melting continental collision |
| url | https://www.mdpi.com/2076-3263/11/2/104 |
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