Chemical variability of Al-Ti-Fe-Mg minerals in peraluminous granitoid rocks from Central Spain
Two broad series of peraluminous granite types can be distinguished in the Central System of Spain. The first group consists of cordierite-bearing granites that are moderately peraluminous in composition (peraluminous S-type granites, PS). The second is composed of amphibole/allanite-bearing granite...
| Autores: | , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 1994 |
| País: | España |
| Institución: | Universidad Complutense de Madrid (UCM) |
| Repositorio: | Docta Complutense |
| Idioma: | inglés |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/57028 |
| Acceso en línea: | https://hdl.handle.net/20.500.14352/57028 |
| Access Level: | acceso abierto |
| Palabra clave: | 552.3(234.1) Hercynian peraluminous granitoids Mineral-whole rock correlation Al-Ti-Fe-Mg minerals Cordierite Garnet Central Spain Petrología |
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Chemical variability of Al-Ti-Fe-Mg minerals in peraluminous granitoid rocks from Central SpainVillaseca González, CarlosBarbero González, Luis C.552.3(234.1)Hercynian peraluminous granitoidsMineral-whole rock correlationAl-Ti-Fe-Mg mineralsCordieriteGarnetCentral SpainPetrologíaTwo broad series of peraluminous granite types can be distinguished in the Central System of Spain. The first group consists of cordierite-bearing granites that are moderately peraluminous in composition (peraluminous S-type granites, PS). The second is composed of amphibole/allanite-bearing granites, weakly peraluminous in composition (peraluminous I-type, PI). These granite types evolved through complex igneous fractionation processes. Both peraluminous granite types show differences in the chemical composition of biotite and cordierite; cordierite is common in PS granites but restricted to some highly fractionated PI granites. Garnet and ilmenite cannot be used as chemical criteria for distinguishing the two series. The Al and Na content of biotite and cordierite correlate well with the granite type (PS and PI). The higher Na content in biotite (and cordierite) of PS granites is noteworthy. When plotted in a Na vs. [VI1A1 diagram biotites are located in different fields according to the peraluminosity degree of the granite type. The estimated Fe3+/(Fe3++Fe2+) ratio of biotite is higher in PI than in PS granites, although this value is very pluton-dependent. Several compositional variations of Al-Ti-Fe-Mg (ATFM) minerals are functions of the degree of fractionation or evolution of the magma, irrespectively of its peraluminosity. Other chemical features of ATFM phases, such as XFe or XMΠ, can be used as fractionation indices. Thus, the more acid the magma, the higher XFe and XMΠ in ATFM minerals. This correlation is not linear showing a rapid increase for silica values of SiO2 ≥ 74 %. Usually, XFe garnet > XFe biotite > XFe cordierite, and XMΠ ilmenite = XMΠ garnet > XMΠ cordierite > XMΠ biotite, while XFe and XMΠ of whole rock are very close to biotite values. The high increase in Mn content, more marked than in Fe, in all AFM phases in the silica-rich granites (SiO2 = 74 %), can be interpreted as a consequence of the incompatible behaviour of this element in highly evolved granites, that are sufficiently poor in Ti, Mg and Fe to prevent or diminish crystallization of ore-minerals, such as ilmenite.E. Schweizerbart'sche VerlagsbuchhandlungUniversidad Complutense de Madrid19941994-01-0119941994-01-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/57028reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/570282026-06-02T12:44:21Z |
| dc.title.none.fl_str_mv |
Chemical variability of Al-Ti-Fe-Mg minerals in peraluminous granitoid rocks from Central Spain |
| title |
Chemical variability of Al-Ti-Fe-Mg minerals in peraluminous granitoid rocks from Central Spain |
| spellingShingle |
Chemical variability of Al-Ti-Fe-Mg minerals in peraluminous granitoid rocks from Central Spain Villaseca González, Carlos 552.3(234.1) Hercynian peraluminous granitoids Mineral-whole rock correlation Al-Ti-Fe-Mg minerals Cordierite Garnet Central Spain Petrología |
| title_short |
Chemical variability of Al-Ti-Fe-Mg minerals in peraluminous granitoid rocks from Central Spain |
| title_full |
Chemical variability of Al-Ti-Fe-Mg minerals in peraluminous granitoid rocks from Central Spain |
| title_fullStr |
Chemical variability of Al-Ti-Fe-Mg minerals in peraluminous granitoid rocks from Central Spain |
| title_full_unstemmed |
Chemical variability of Al-Ti-Fe-Mg minerals in peraluminous granitoid rocks from Central Spain |
| title_sort |
Chemical variability of Al-Ti-Fe-Mg minerals in peraluminous granitoid rocks from Central Spain |
| dc.creator.none.fl_str_mv |
Villaseca González, Carlos Barbero González, Luis C. |
| author |
Villaseca González, Carlos |
| author_facet |
Villaseca González, Carlos Barbero González, Luis C. |
| author_role |
author |
| author2 |
Barbero González, Luis C. |
| author2_role |
author |
| dc.contributor.none.fl_str_mv |
Universidad Complutense de Madrid |
| dc.subject.none.fl_str_mv |
552.3(234.1) Hercynian peraluminous granitoids Mineral-whole rock correlation Al-Ti-Fe-Mg minerals Cordierite Garnet Central Spain Petrología |
| topic |
552.3(234.1) Hercynian peraluminous granitoids Mineral-whole rock correlation Al-Ti-Fe-Mg minerals Cordierite Garnet Central Spain Petrología |
| description |
Two broad series of peraluminous granite types can be distinguished in the Central System of Spain. The first group consists of cordierite-bearing granites that are moderately peraluminous in composition (peraluminous S-type granites, PS). The second is composed of amphibole/allanite-bearing granites, weakly peraluminous in composition (peraluminous I-type, PI). These granite types evolved through complex igneous fractionation processes. Both peraluminous granite types show differences in the chemical composition of biotite and cordierite; cordierite is common in PS granites but restricted to some highly fractionated PI granites. Garnet and ilmenite cannot be used as chemical criteria for distinguishing the two series. The Al and Na content of biotite and cordierite correlate well with the granite type (PS and PI). The higher Na content in biotite (and cordierite) of PS granites is noteworthy. When plotted in a Na vs. [VI1A1 diagram biotites are located in different fields according to the peraluminosity degree of the granite type. The estimated Fe3+/(Fe3++Fe2+) ratio of biotite is higher in PI than in PS granites, although this value is very pluton-dependent. Several compositional variations of Al-Ti-Fe-Mg (ATFM) minerals are functions of the degree of fractionation or evolution of the magma, irrespectively of its peraluminosity. Other chemical features of ATFM phases, such as XFe or XMΠ, can be used as fractionation indices. Thus, the more acid the magma, the higher XFe and XMΠ in ATFM minerals. This correlation is not linear showing a rapid increase for silica values of SiO2 ≥ 74 %. Usually, XFe garnet > XFe biotite > XFe cordierite, and XMΠ ilmenite = XMΠ garnet > XMΠ cordierite > XMΠ biotite, while XFe and XMΠ of whole rock are very close to biotite values. The high increase in Mn content, more marked than in Fe, in all AFM phases in the silica-rich granites (SiO2 = 74 %), can be interpreted as a consequence of the incompatible behaviour of this element in highly evolved granites, that are sufficiently poor in Ti, Mg and Fe to prevent or diminish crystallization of ore-minerals, such as ilmenite. |
| publishDate |
1994 |
| dc.date.none.fl_str_mv |
1994 1994-01-01 1994 1994-01-01 |
| dc.type.none.fl_str_mv |
journal article http://purl.org/coar/resource_type/c_6501 |
| dc.type.openaire.fl_str_mv |
info:eu-repo/semantics/article |
| format |
article |
| dc.identifier.none.fl_str_mv |
https://hdl.handle.net/20.500.14352/57028 |
| url |
https://hdl.handle.net/20.500.14352/57028 |
| dc.language.none.fl_str_mv |
Inglés eng |
| language_invalid_str_mv |
Inglés |
| language |
eng |
| dc.rights.none.fl_str_mv |
open access http://purl.org/coar/access_right/c_abf2 |
| dc.rights.openaire.fl_str_mv |
info:eu-repo/semantics/openAccess |
| rights_invalid_str_mv |
open access http://purl.org/coar/access_right/c_abf2 |
| eu_rights_str_mv |
openAccess |
| dc.format.none.fl_str_mv |
application/pdf |
| dc.publisher.none.fl_str_mv |
E. Schweizerbart'sche Verlagsbuchhandlung |
| publisher.none.fl_str_mv |
E. Schweizerbart'sche Verlagsbuchhandlung |
| dc.source.none.fl_str_mv |
reponame:Docta Complutense instname:Universidad Complutense de Madrid (UCM) |
| instname_str |
Universidad Complutense de Madrid (UCM) |
| reponame_str |
Docta Complutense |
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Docta Complutense |
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1869410208570146816 |
| score |
15.300719 |