Stratigraphy of the Coranzulí Caldera
The Coranzulí caldera (23°S, 66°15′W) is a large volcanic complex located in the eastern part of the Northern Puna, Central Andes. Its location is controlled by the intersection of two lineaments striking NW–SE and NE–SW, respectively. The Coranzulí caldera has emitted three major pyroclastic units and one smaller pyroclastic unit related to the caldera’s formation, and three lava flows represent the final stages of its eruptive cycle. The pyroclastic sequences are dacitic and crystal rich, moderately to intensely welded, and contain highly vesiculated pumice fragments. The ages obtained for the ignimbrites range between 6.8 ± 0.15 Ma and 6.45 ± 0.15 Ma. The absence of fall-out deposits indicates that a relatively low-height eruptive column fed the pyroclastic sequences. The deposits cover an area of 1900 km2 and have a volume of 400 km3 (dense-rock equivalent, DRE).
KeywordsCoranzulí Northern Puna Caldera Central Andes
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