22°30′S 66°15′W / 22.500°S 66.250°W / -22.500; -66.250 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. 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.
References
- ^ Prezzi, Claudia B.; Lince Klinger, Federico (March 2010). "Nuevas evidencias geofísicas de la existencia de una caldera cubierta en laguna Pozuelos: Puna norte" [New geophysical evidences of the existence of a covered caldera in Pozuelos lagoon, North Puna]. Revista de la Asociación Geológica Argentina (in Spanish). 66 (1–2): 282–295.
- 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. Bibcode:2006JSAES..22...89P. doi:10.1016/j.jsames.2006.08.004. hdl:11336/76184.
- 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. Bibcode:2002JPet...43..907C. doi:10.1093/petrology/43.5.907.
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