22°22′S 66°08′W / 22.367°S 66.133°W[1]Cerro Redondo is a lava dome complex in the northern Puna,[1] north of Rinconada.[2] It is situated over the Ordovician basement east of the Sierra de Rinconada. The lava domes were erupted along ring fractures on a preceding fall deposit containing blocks and breccia.[1] Another report indicates just one isolated dacite dome.[2] Intense hydrothermal alteration has occurred on the lavas.[3]
The breccia and pyroclastics are 12.54±1.1 mya old, determined from fission track dating of apatite.[2] The complex may be linked to a caldera together with the neighbouring Chinchillas and Pan de Azúcar centres. Each of them is associated with mineral deposits which were mined on Pan de Azúcar.[1] Cerro Redondo's breccia is flanked by normal faults and one reverse fault is located within the complex.[2]
References
edit- ^ a b c d 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. hdl:11336/76184.
- ^ a b c d Cladouhos, T.T.; Allmendinger, R.W.; Coira, B.; Farrar, E. (April 1994). "Late cenozoic deformation in the Central Andes: fault kinematics from the northern Puna, northwestern Argentina and southwestern Bolivia". Journal of South American Earth Sciences. 7 (2): 209–228. doi:10.1016/0895-9811(94)95008-6.
- ^ Prezzi, Claudia; Caffe, Pablo J.; Somoza, Rubén (September 2004). "New paleomagnetic data from the northern Puna and western Cordillera Oriental, Argentina: a new insight on the timing of rotational deformation". Journal of Geodynamics. 38 (2): 93–115. doi:10.1016/j.jog.2004.05.001. hdl:11336/83497.
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