Earth:Chinchillas (lava dome)
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Template:Coord/display/intitle Chinchillas is a lava dome complex in the northern Puna of the Andes, in the Sierra de Rinconada. The complex is constructed on an Ordovician basement called the Acoite Formation.[1] In addition to the dacitic lava dome on the southern end of the complex it also contains small volume massive pyroclastic flows and ash-and-block flows. The complex has a volume of 0.26 cubic kilometres (0.062 cu mi). The complex was formed 13±1 mya over a fault zone. Hydrothermal Ag-Pb-Zn deposits found there in breccia were mined occasionally. According to Coira et al. (1996) it, Cerro Redondo and Pan de Azúcar may be part of a caldera system in the Pozuelos Basin.[2][3]
References
- ↑ Prezzi, Claudia; Götze, Hans-Jürgen (November 2006). "3D modeling of buried intrusives in Pan de Azúcar zone (northern Puna, Argentina) from ground magnetic data". Journal of South American Earth Sciences 22 (1–2): 89–97. doi:10.1016/j.jsames.2006.08.004. Bibcode: 2006JSAES..22...89P.
- ↑ Caffe, P. J. (1 May 2002). "Petrogenesis of Early Neogene Magmatism in the Northern Puna; Implications for Magma Genesis and Crustal Processes in the Central Andean Plateau". Journal of Petrology 43 (5): 907–942. doi:10.1093/petrology/43.5.907. Bibcode: 2002JPet...43..907C.
- ↑ Prezzi, Claudia B.; Lince Klinger, Federico (March 2010). "Nuevas evidencias geofísicas de la existencia de una caldera cubierta en laguna Pozuelos: Puna norte" (in Spanish). Revista de la Asociación Geológica Argentina 66 (1–2): 282–295. http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0004-48222010000100025.