Dating metasomatic events in the lithospheric mantle beneath the Calatrava volcanic field (central Spain)
Metadatos
Mostrar el registro completo del ítemEditorial
The Geological Society of America
Fecha
2018-12-27Referencia bibliográfica
Villaseca, C., Belousova, E. A., Barfod, D. N., & González-Jiménez, J. M. (2019). Dating metasomatic events in the lithospheric mantle beneath the Calatrava volcanic field (central Spain). Lithosphere, 11(2), 192-208.
Patrocinador
This work is included in the objectives and supported by the CGL2016–78796 project of the Spanish Ministerio de Ciencia, Innovación y Universidades (MICINN) and the UCM 910492 group. González-Jiménez acknowledges financial support of the Ramón y Cajal Fellowship RYC-2015–17596, granted by the Spanish Ministerio de Economía y Empresa (MINECO).Resumen
We report the first attempt to date metasomatic events in peridotite xenoliths from the Subcontinental Lithospheric Mantle (SCLM) beneath
the Cenozoic Calatrava volcanic field of central Spain. The most metasomatized xenoliths of the El Aprisco olivine melilitite maar were
selected to perform a geochronological study on metasomatic apatite (U-Pb method) and amphibole (Ar-Ar), integrated with an enlarged
chemical data set on these minerals. The metasomatic agents in studied samples are mainly carbonate-rich ultra-alkaline melts of probable
asthenospheric derivation. Some samples have been overprinted by more than one metasomatic event. The geochronological data
confirm three metasomatic events that occurred within the SCLM beneath central Spain in Cretaceous (118 Ma), Oligocene (29 Ma), and
Miocene (16–4 Ma) times, much earlier than the host volcanic magmatism. To date, no magmatic events of those ages have been recorded
in central Spain. However, a correlation with several cycles of sporadic intraplate magmatism of alkaline affinity in the Iberian microplate
is suggested. This study illustrates that the SCLM preserves the memory of a complex history of melt and/or fluid percolation processes
in a metasomatic record that is generally unrelated to shallower crustal magmatic events.