25°44′S 68°45′W / 25.733°S 68.750°W / -25.733; -68.750Sierra de Gorbea is a large lava field in the Chilean Andes that has been dated 4.7±0.5 Ma and 5.2±0.5 Ma by potassium argon dating. The lavas are dacitic to basaltic andesite with rhyolitic inclusions and no vent is evident.
References
- ^ Trumbull, R.B; Wittenbrink, R; Hahne, K; Emmermann, R; Büsch, W; Gerstenberger, H; Siebel, W (1999). "Evidence for Late Miocene to Recent contamination of arc andesites by crustal melts in the Chilean Andes (25–26°S) and its geodynamic implications". Journal of South American Earth Sciences. 12 (2): 135–155. doi:10.1016/S0895-9811(99)00011-5. ISSN 0895-9811.
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