Middle Eocene deformation and sedimentation in the Puna-Eastern Cordillera transition (23°-26°S): control by preexisting heterogeneities on the pattern of initial Andean shortening
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The Quebrada de los Colorados Formation, at the north end of Calchaquí Valley in Salta Province, northwest Argentina, preserves evidence of syndepositional deformation since the middle Eocene (ca.40 Ma) that includes (1) an angular unconformity with the underlying Salta Group (Paleogene), and (2) internal unconformities and changes in vertical facies succession and provenance.Its fossil record [mammalian (notoungulates), middle Eocene] is correlatable to the Casa Grande Formation, which also unconformably overlies the Salta Group; both units record middle Eocene deformation along the eastern border of the Puna Plateau and outline previous fi rst-order mechanical heterogeneities related to the Cretaceous rift basin border.Along the western margin of the Puna, Eocene deformation coincides with thermal (magmatic arc) and mechanical (basin inversion) heterogeneities.Thus, the distribution of Eocene deformation followed an irregular pattern as a consequence of the heritage of preexisting heterogeneities.
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Basement inherited heterogeneities, Cenozoic Andean tectonics and Neogene plateau rise were key factors for the formation of endorheic basins in the plateau, while the arid climate ensured their preservation.
“Basement inherited heterogeneities (Hongn et al., 2007), Cenozoic Andean tectonics (actively uplifting ranges) and Neogene plateau rise were key factors for the formation of endorheic basins in the plateau, while the arid climate (Garreaud, 2009) has ensured their preservation (Vandervoort et al., 1995;López Steinmetz et al., 2020b).”
From Brine grades in Andean salars: When basin size matters A review of the Lithium Triangle (2021) · cites this paper as Hongn et al., 2007
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Brine grades in Andean salars: When basin size matters A review of the Lithium Triangle
López Steinmetz, R. L., & Salvi, S. (2021) · Earth-Science Reviews · doi:10.1016/j.earscirev.2021.103615 · Cited by 71 · see citing works
- Authors
- Hongn, F., Papa, C. D., Powell, J., Petrinovic, I., Mon, R., & Deraco, V.
- Affiliations
- National University of Salta (AR)
- National University of Tucumán (AR)
- Venue
- Geology
- Publisher
- Geological Society of America
- Published
- 2007
- Volume
- 35
- Issue
- 3
- Pages
- 271
- ISSN
- 0091-7613 (ISSN-L)
- OpenAlex
- W2058963600
- Cited by
- 152
- References
- 26
- Citations by year
- 2026: 4 · 2025: 6 · 2024: 5 · 2023: 9 · 2022: 8 · 2021: 10 · 2020: 10 · 2019: 9 · 2018: 2 · 2017: 7 · 2016: 9 · 2015: 8 · 2014: 12 · 2013: 7 · 2012: 14
- FWCI
- 7.04
- Type
- journal article
- Language
- en
- Open access
- bronze
- doi.org
- Locations
- Geology (publishedVersion)
- CONICET Digital (CONICET) (submittedVersion, cc-by-nc-sa)
- Conicet (submittedVersion, cc-by-nc-sa)
- Funders
- Agencia Nacional de Promoción Científica y Tecnológica
- Topics
- Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Tectonic Studies in Latin America
- Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
- Physical Sciences › Earth and Planetary Sciences › Geology › Geological and Geophysical Studies
- Keywords
- syndepositional deformation, angular unconformity, facies succession, sediment provenance, Salta Group, Cretaceous rift basin, magmatic arc, basin inversion, Puna Plateau, Calchaquí Valley, Salta
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