Do extrusion ages reflect magma generation processes at depth? An example from the Neogene Volcanic Province of SE Spain

The high-K calc-alkaline volcanic rocks along the Neogene Volcanic Province of SE Spain represent crustal anatectic melts mixed with mantle components during the opening of the Alboran Sea. Partially melted metapelitic enclaves, along with the geochemical signature, provide evidence of their crustal source. U-Pb SHRIMP geochronology on monazite and zircon from enclaves and their hosting lavas in the localities of El Hoyazo, MazarrA(3)n and Mar Menor reveals variable delays between the melting at depth and the eruption of the volcanics. These data indicate that: (1) the most important event of anatexis in the Neogene spanned at least the 3 m.y. interval between 12 and 9 Ma; (2) there is no trend in age of crustal melting; and (3) the delay between magma generation and extrusion varies from more than 3 m.y. at El Hoyazo to similar to 0.5 m.y. and possibly 2.5 m.y. at Mar Menor, with no significant delay measurable at MazarrA(3)n. The variable time delay between anatexis and lava extrusion indicates that radiometric ages of volcanics may provide misleading information on the timing of magma genesis occurring at depth. This highlights the pitfall of basing detailed geodynamic models on volcanic extrusion ages alone.

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Cesare B. Rubatto D. y Gomez-Pugnaire M.T. Do extrusion ages reflect magma generation processes at depth? An example from the Neogene Volcanic Province of SE Spain. Springer Nature, 2008. https://doi.org/10.1007/s00410-008-0333-x

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Resource type Article
Date of creation 2024-11-05
Date of last revision 2024-11-05
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Metadata identifier 30bc4ab0-bb9d-52e6-9fda-7f78a9bfab32
Metadata language Spanish
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High-value dataset category Earth observation and environment
ISO 19115 topic category biota
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Name of the dataset creator Cesare, B., Rubatto, D. y Gomez-Pugnaire, M.T.
Name of the dataset editor Springer Nature
Other identifier DOI: 10.1007/s00410-008-0333-x
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Email of the dataset creator bernardo.cesare@unipd.it
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