Mineralogical characterization of peridotite xenoliths from the Los Tormos volcano (Calatrava volcanic field)
Peridotite xenoliths from the Los Tormos volcano (Calatrava volcanic field)provide significant information about the lithospheric mantle of Central Iberia.Studied samples are classified as spinel-bearing lherzolite, harzburgite andwehrlite. Chemical composition of olivine and two pyroxenes shows sim...
| Autores: | , , |
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| Tipo de documento: | artigo |
| Data de publicação: | 2018 |
| País: | España |
| Recursos: | Universidad de Huelva (UHU) |
| Repositório: | Arias Montano. Repositorio Institucional de la Universidad de Huelva |
| Idioma: | inglês |
| OAI Identifier: | oai:ariasmontano.uhu.es:10272/16568 |
| Acesso em linha: | http://hdl.handle.net/10272/16568 |
| Access Level: | Acceso aberto |
| Palavra-chave: | Peridotite xenoliths Megacrysts Partial melting Calatrava volcanic field Xenolitos de peridotita Megacristales Fusión parcial Campo volcánico de Calatrava |
| Resumo: | Peridotite xenoliths from the Los Tormos volcano (Calatrava volcanic field)provide significant information about the lithospheric mantle of Central Iberia.Studied samples are classified as spinel-bearing lherzolite, harzburgite andwehrlite. Chemical composition of olivine and two pyroxenes shows similarMg# ranges, providing evidence of mineral equilibrium. Geothermobarometicestimates give depths in the spinel peridotite stability field (35-50 km, 10-15.2 kbar), and temperatures of 961-1185 °C. Major element mineral meltingmodels in the lherzolite xenoliths record a low partial melting degree (up to10%) although one harzburgite indicates a higher degree of melting (about15%). The wehrlite sample could result from metasomatism by interactionwith alkaline silica-undersaturated melts that replaced primary lherzoliteorthopyroxene. Similar estimated pressures for peridotite mineral equilibrationand for clinopyroxene megacryst/phenocryst crystallization in the host nephe-linite suggest the formation of mantle magma chambers, where alkalinemagmas entrained megacrysts (cumulates) and peridotite wall-rocks |
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