22°30′S 66°15′W / 22.500°S 66.250°W / -22.500; -66.250[1] 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.[2] 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.[3][1]

References

  1. 1 2 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.
  2. ↑ 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.
  3. ↑ 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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