CIG   05423
CENTRO DE INVESTIGACIONES GEOLOGICAS
Unidad Ejecutora - UE
artículos
Título:
Vent distribution in the Quaternary Payún Matrú Volcanic Field, western Argentina: Its relation to tectonics and crustal structures
Autor/es:
LLAMBÍAS, E. J.; HERNANDO, I.; FRANZESE, J.; PETRINOVIC, I.
Revista:
TECTONOPHYSICS
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2014 vol. 622 p. 122 - 134
ISSN:
0040-1951
Resumen:
The Payún Matrú Volcanic Field consists of two polygenetic and mostly
trachytic volcanoes (Payún Matrú with a summit caldera and Payún Liso)
along with around 220 scoria cones and basaltic lava flows. This
volcanic field belongs to the Payenia Basaltic Province (33° 30'-38° S),
a Quaternary Andean back-arc basaltic province of the Southern Volcanic
Zone, in western Argentina. The vent density distribution of the Payún
Matrú Volcanic Field is different from the other volcanic fields within
Payenia. The Payún Matrú volcano and the scoria cones are distributed in
an E-W oriented fringe about 15. km wide and 70. km long, with the
Payún Matrú caldera in the middle of this fringe. The structural
framework in which the volcanic field is located allows to infer that
this vent density distribution is strongly conditioned by pre-existing
crustal anisotropies. The volcanic field is located in a transfer zone
related to Jurassic extensional structures of the Neuquén Basin, which
were inverted also as a transfer zone during the Miocene compressive
deformation that formed the Malargüe fold and thrust belt, and, in
addition, it is located in the southern margin of a Neogene syn-orogenic
basin. The analysis of vent center location and vent morphology is
helpful to determine basaltic vent alignments within the Payún Matrú
Volcanic Field and to infer the syn-eruptive stress field. This analysis
shows that vent alignments are compatible with the present-day maximum
horizontal stress, as measured by break-out of oil wells.