Lithium-, Phosphorus-, and Fluorine-Rich Intrusions and the Phosphate Sequence at Segura (Portugal): A Comparison with Other Hyper-Differentiated Magmas
Near the Segura pluton, hyper-differentiated magmas enriched in F, P, and Li migrated through shallowly dipping fractures, which were sub-perpendicular to the schistosity of the host Neoproterozoic to Lower Cambrian metasedimentary series, to form two swarms of low-plunging aplite–pegmatite dykes. T...
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MDPI AG
2024-03-01
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| Series: | Minerals |
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| Online Access: | https://www.mdpi.com/2075-163X/14/3/287 |
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| author | Michel Cathelineau Marie-Christine Boiron Andreï Lecomte Ivo Martins Ícaro Dias da Silva Antonio Mateus |
| author_facet | Michel Cathelineau Marie-Christine Boiron Andreï Lecomte Ivo Martins Ícaro Dias da Silva Antonio Mateus |
| author_sort | Michel Cathelineau |
| collection | DOAJ |
| description | Near the Segura pluton, hyper-differentiated magmas enriched in F, P, and Li migrated through shallowly dipping fractures, which were sub-perpendicular to the schistosity of the host Neoproterozoic to Lower Cambrian metasedimentary series, to form two swarms of low-plunging aplite–pegmatite dykes. The high enrichment factors for the fluxing elements (F, P, and Li) compared with peraluminous granites are of the order of 1.5 to 5 and are a consequence of the extraction of low-viscosity magma from the crystallising melt. With magmatic differentiation, increased P and Li activity yielded the crystallisation of the primary amblygonite–montebrasite series and Fe-Mn phosphates. The high activity of sodium during the formation of the albite–topaz assemblage in pegmatites led to the replacement of the primary phosphates by lacroixite. The influx of external, post-magmatic, and Ca-Sr-rich hydrothermal fluids replaced the initial Li-Na phosphates with phosphates of the goyazite–crandallite series and was followed by apatite formation. Dyke emplacement in metasediments took place nearby the main injection site of the muscovite granite, which plausibly occurred during a late major compression event. |
| first_indexed | 2024-04-24T17:59:01Z |
| format | Article |
| id | doaj.art-1a008c4bf8b74ff091792e7d4b4c84ab |
| institution | Directory Open Access Journal |
| issn | 2075-163X |
| language | English |
| last_indexed | 2024-04-24T17:59:01Z |
| publishDate | 2024-03-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Minerals |
| spelling | doaj.art-1a008c4bf8b74ff091792e7d4b4c84ab2024-03-27T13:56:19ZengMDPI AGMinerals2075-163X2024-03-0114328710.3390/min14030287Lithium-, Phosphorus-, and Fluorine-Rich Intrusions and the Phosphate Sequence at Segura (Portugal): A Comparison with Other Hyper-Differentiated MagmasMichel Cathelineau0Marie-Christine Boiron1Andreï Lecomte2Ivo Martins3Ícaro Dias da Silva4Antonio Mateus5Université de Lorraine, CNRS, GeoRessources, 54000 Nancy, FranceUniversité de Lorraine, CNRS, GeoRessources, 54000 Nancy, FranceUniversité de Lorraine, CNRS, GeoRessources, 54000 Nancy, FranceFaculdade de Ciências, Instituto Dom Luiz, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, PortugalFaculdade de Ciências, Instituto Dom Luiz, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, PortugalFaculdade de Ciências, Instituto Dom Luiz, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, PortugalNear the Segura pluton, hyper-differentiated magmas enriched in F, P, and Li migrated through shallowly dipping fractures, which were sub-perpendicular to the schistosity of the host Neoproterozoic to Lower Cambrian metasedimentary series, to form two swarms of low-plunging aplite–pegmatite dykes. The high enrichment factors for the fluxing elements (F, P, and Li) compared with peraluminous granites are of the order of 1.5 to 5 and are a consequence of the extraction of low-viscosity magma from the crystallising melt. With magmatic differentiation, increased P and Li activity yielded the crystallisation of the primary amblygonite–montebrasite series and Fe-Mn phosphates. The high activity of sodium during the formation of the albite–topaz assemblage in pegmatites led to the replacement of the primary phosphates by lacroixite. The influx of external, post-magmatic, and Ca-Sr-rich hydrothermal fluids replaced the initial Li-Na phosphates with phosphates of the goyazite–crandallite series and was followed by apatite formation. Dyke emplacement in metasediments took place nearby the main injection site of the muscovite granite, which plausibly occurred during a late major compression event.https://www.mdpi.com/2075-163X/14/3/287peraluminous aplite and pegmatitephosphoruslithiumfluorineeosphoritemontebrasite |
| spellingShingle | Michel Cathelineau Marie-Christine Boiron Andreï Lecomte Ivo Martins Ícaro Dias da Silva Antonio Mateus Lithium-, Phosphorus-, and Fluorine-Rich Intrusions and the Phosphate Sequence at Segura (Portugal): A Comparison with Other Hyper-Differentiated Magmas Minerals peraluminous aplite and pegmatite phosphorus lithium fluorine eosphorite montebrasite |
| title | Lithium-, Phosphorus-, and Fluorine-Rich Intrusions and the Phosphate Sequence at Segura (Portugal): A Comparison with Other Hyper-Differentiated Magmas |
| title_full | Lithium-, Phosphorus-, and Fluorine-Rich Intrusions and the Phosphate Sequence at Segura (Portugal): A Comparison with Other Hyper-Differentiated Magmas |
| title_fullStr | Lithium-, Phosphorus-, and Fluorine-Rich Intrusions and the Phosphate Sequence at Segura (Portugal): A Comparison with Other Hyper-Differentiated Magmas |
| title_full_unstemmed | Lithium-, Phosphorus-, and Fluorine-Rich Intrusions and the Phosphate Sequence at Segura (Portugal): A Comparison with Other Hyper-Differentiated Magmas |
| title_short | Lithium-, Phosphorus-, and Fluorine-Rich Intrusions and the Phosphate Sequence at Segura (Portugal): A Comparison with Other Hyper-Differentiated Magmas |
| title_sort | lithium phosphorus and fluorine rich intrusions and the phosphate sequence at segura portugal a comparison with other hyper differentiated magmas |
| topic | peraluminous aplite and pegmatite phosphorus lithium fluorine eosphorite montebrasite |
| url | https://www.mdpi.com/2075-163X/14/3/287 |
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