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Abstract:

Payún Matru Volcanic Field is a Quaternary monogenetic volcanic field that hosts scoria cones with perfect to breached morphologies. Los Morados complex is a group of at least four closely spaced scoria cones (Los Morados main cone and the older Cones A, B, and C). Los Morados main cone was formed by a long lived eruption of months to years. After an initial Hawaiian-style stage, the eruption changed to a normal Strombolian, conebuilding style, forming a cone over 150 metres high on a northward dipping (∼4°) surface. An initial cone gradually grew until a lava flow breached the cone's base and rafted an estimated 10% of the total volume. A sudden sector collapse initiated a dramatic decompression in the upper part of the feeding conduit and triggered violent a Strombolian style eruptive stage. Subsequently, the eruption became more stable, and changed to a regular Strombolian style that partially rebuilt the cone. A likely increase in magma flux coupled with the gradual growth of a new cone caused another lava flow outbreak at the structurally weakened earlier breach site. For a second time, the unstable flank of the cone was rafted, triggering a second violent Strombolian eruptive stage which was followed by a Hawaiian style lava fountain stage. The lava fountaining was accompanied by a steady outpour of voluminous lava emission accompanied by constant rafting of the cone flank, preventing the healing of the cone. Santa Maria is another scoria cone built on a nearly flat pre-eruption surface. Despite this it went through similar stages as Los Morados main cone, but probably not in as dramatic a manner as Los Morados. In contrast to these examples of large breached cones, volumetrically smaller cones, associated to less extensive lava flows, were able to heal raft/collapse events, due to the smaller magma output and flux rates. Our evidence shows that scoria cone growth is a complex process, and is a consequence of the magma internal parameters (e.g. volatile content, magma flux, recharge, output volume) and external conditions such as inclination of the pre-eruptive surface where they grew and thus gravitational instability. © 2011 © Versita Warsaw and Springer-Verlag Wien.

Registro:

Documento: Artículo
Título:The role of collapsing and cone rafting on eruption style changes and final cone morphology: Los Morados scoria cone, Mendoza, Argentina
Autor:Németh, K.; Risso, C.; Nullo, F.; Kereszturi, G.
Filiación:Volcanic Risk Solutions, Massey University, Private Bag 11 222, Palmerston North, New Zealand
Departamento de Geología, Area Riesgo Volcánico, FCEyN-Universidad de Buenos Aires, Buenos Aires, Argentina
CONICET-SEGEMAR, Buenos Aires, Argentina
Geological Institute of Hungary, Stefánia út 14, Budapest, 1143, Hungary
Palabras clave:aa lava; agglutinate; breached cone; clastogenic lava flow; debris avalanche; lava spatter; pahoehoe; scoria cone; Strombolian, Hawaiian
Año:2011
Volumen:3
Número:2
Página de inicio:102
Página de fin:118
DOI: http://dx.doi.org/10.2478/s13533-011-0008-4
Título revista:Central European Journal of Geosciences
Título revista abreviado:Cent. Euro. J. Geosci.
ISSN:20819900
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_20819900_v3_n2_p102_Nemeth

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Citas:

---------- APA ----------
Németh, K., Risso, C., Nullo, F. & Kereszturi, G. (2011) . The role of collapsing and cone rafting on eruption style changes and final cone morphology: Los Morados scoria cone, Mendoza, Argentina. Central European Journal of Geosciences, 3(2), 102-118.
http://dx.doi.org/10.2478/s13533-011-0008-4
---------- CHICAGO ----------
Németh, K., Risso, C., Nullo, F., Kereszturi, G. "The role of collapsing and cone rafting on eruption style changes and final cone morphology: Los Morados scoria cone, Mendoza, Argentina" . Central European Journal of Geosciences 3, no. 2 (2011) : 102-118.
http://dx.doi.org/10.2478/s13533-011-0008-4
---------- MLA ----------
Németh, K., Risso, C., Nullo, F., Kereszturi, G. "The role of collapsing and cone rafting on eruption style changes and final cone morphology: Los Morados scoria cone, Mendoza, Argentina" . Central European Journal of Geosciences, vol. 3, no. 2, 2011, pp. 102-118.
http://dx.doi.org/10.2478/s13533-011-0008-4
---------- VANCOUVER ----------
Németh, K., Risso, C., Nullo, F., Kereszturi, G. The role of collapsing and cone rafting on eruption style changes and final cone morphology: Los Morados scoria cone, Mendoza, Argentina. Cent. Euro. J. Geosci. 2011;3(2):102-118.
http://dx.doi.org/10.2478/s13533-011-0008-4