Río Murta (volcano)
46°10′12″S 72°42′29″W / 46.17°S 72.708°W[1]
Río Murta is a volcano in Chile.
The volcano consists of a complex of
lava flows along the valleys of the Río Murta. These flows display columnar joints, lava tubes and pillow lavas,[1] and have volumes of less than 1 cubic kilometre (0.24 cu mi).[2] These landforms along with the presence of palagonite indicate that the eruptions happened beneath glaciers.[3]
Volcanic activity in the region is in part influenced by the
Austral Volcanic Zone volcanism south of the gap formed by the slow subduction of the younger and warmer Antarctic Plate.[3] In between these two subduction processes, a slab window opened up and allowed the rise of alkali basalt magmas.[4]
Río Murta rocks are
clinopyroxene, olivine and plagioclase.[3] The chemical composition is unlike that of other regional basaltic volcanoes, and reflects the influence of oceanic asthenosphere.[2]
The basement in the region is formed by various
plutons of the Northern Patagonian Batholith were intruded into this basement and may have an origin in the subduction of the Nazca Plate-Farallon Plate.[2]
The age of these flows is controversial.
Cerro Hudson, an active arc volcano.[4]
References
- ^ a b c "Rio Murta". Global Volcanism Program. Smithsonian Institution.
- ^ .
- ^ a b c Corgne et al. 2001, p. 364.
- ^ a b Corgne et al. 2001, p. 365.
Sources
- Corgne, Alexandre; Maury, René C; Lagabrielle, Yves; Bourgois, Jacques; Suarez, Manuel; Cotten, Joseph; Bellon, Hervé (2001-10-15). "La diversité des basaltes de Patagonie à la latitude du point triple du Chili (46°–47° lat. S) : données complémentaires et implications sur les conditions de la subduction". Comptes Rendus de l'Académie des Sciences, Série IIA. 333 (7): 363–371. .