A window on the lithospheric mantle beneath the eastern Trans-Mexican volcanic belt: Insights from pargasite-bearing mantle xenocrysts from the Holocene Ocotenco maar volcano
Por:
Lucci F., Cavazos-Alvarez J.A., White J.C., Sosa-Ceballos G., Ruospo D., Hermenegildo N.S., Torres-Sánchez D., Carrasco-Núñez G.
Publicada:
1 ene 2024
Resumen:
In this short communication, we report and discuss for the first time the occurrence of pargasite-bearing pyroxenite mantle macro-xenocrysts in a basaltic-andesite juvenile material erupted from the Holocene Ocotenco maar at the Serdán-Oriental Basin Volcanic field, situated in the eastern sector of the Trans-Mexican Volcanic Belt. Through an integrated approach based on microtextural observations, mineral chemistry, geothermobarometric modelling, and comparisons with the existing literature, we determined the xenocrysts equilibrated at ca. 0.8 GPa and 1100 °C, compatible with a pargasite-bearing, upper lithospheric mantle setting. The different textures (resorbed vs. unzoned) of xenocrysts, not only provide evidence of a mantle melting event, but also enabled the discrimination between disrupted mantle fragments and peritectic solid phase generated during the pargasite breakdown. Moreover, peculiar characteristics of the xenocrysts such as the dark pargasite rims and the melt embayment in clinopyroxene, together with the lack of phenocrysts from magma fractionation, the swallow-tail texture of groundmass plagioclase, and a vesicle-rich textures, cumulatively suggest a short-term (days to months?) eruptive scenario with a fast melt extraction from the source region to a rapid ascent through the crust and a sudden explosive eruption by the intense interaction of the ascending melt with a source of water close to the surface. © 2024 The Authors
Filiaciones:
Lucci F.:
Dipartimento di Scienze Della Terra e Geoambientali, Università Degli Studi di Bari “Aldo Moro”, Bari, 70125, Italy
Cavazos-Alvarez J.A.:
Centro de Geociencias, Universidad Nacional Autónoma de México, Blvd. Juriquilla 3001, Campus UNAM-Juriquilla, Querétaro, 76230, Mexico
White J.C.:
Department of Physics, Geosciences, and Astronomy, Eastern Kentucky University, Richmond, 40475, KY, United States
Sosa-Ceballos G.:
Instituto de Geofísica, Unidad Michoacán, Universidad Nacional Autónoma de México, Antigua carretera a Pátzcuaro 8701, Michoacán, Morelia, 58190, Mexico
Ruospo D.:
Dipartimento di Scienze Della Terra e Geoambientali, Università Degli Studi di Bari “Aldo Moro”, Bari, 70125, Italy
Hermenegildo N.S.:
Instituto de Geofísica, Unidad Michoacán, Universidad Nacional Autónoma de México, Antigua carretera a Pátzcuaro 8701, Michoacán, Morelia, 58190, Mexico
Torres-Sánchez D.:
Instituto de Geofísica, Unidad Michoacán, Universidad Nacional Autónoma de México, Antigua carretera a Pátzcuaro 8701, Michoacán, Morelia, 58190, Mexico
Carrasco-Núñez G.:
Centro de Geociencias, Universidad Nacional Autónoma de México, Blvd. Juriquilla 3001, Campus UNAM-Juriquilla, Querétaro, 76230, Mexico
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