Ostracods from upper Yacoraite Formation (Danian), Salta Basin, Western Argentina: Taxonomy and paleoenvironmental indicators of climatic signals in lacustrine deposits

Ceolín, Daiane; Filho, Marcos Antonio Batista dos Santos; Terra, Gerson José Salamoni; Fragoso, Daniel Galvão Carnier; Bunevich, Rodrigo Brandão; Fauth, Gerson; Hernandez, Juan I.; Hernández, Roberto M.

doi:10.1016/j.jsames.2022.103836

Cited by 5 publications

(3 citation statements)

References 18 publications

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“…Our observations are in line with hypotheses from other authors (Deschamps et al., 2020; Gomes et al., 2020; Hernández et al., 2008; Llorens et al., 2022; Palma, 2000; Rohais et al., 2019) who interpreted the Yacoraite Formation as deposited in a lacustrine environment. The common presence of lacustrine ostracods (Ceolin et al., 2022), the rapid facies transitions and high vertical heterogeneity of the succession also support this interpretation, together with the absence of any common marine fossils.…”

Section: Discussionmentioning

confidence: 83%

Structural Inheritance in the Eastern Cordillera, NW Argentina: Low‐Temperature Thermochronology of the Cianzo Basin

van Kooten,

Vallati,

Sobel

et al. 2024

Tectonics

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The present‐day deformation style of the Eastern Cordillera in NW Argentina is strongly influenced by the inversion of pre‐existing Paleozoic and Mesozoic structures. In particular, the extensional faults and lithological contrasts resulting from the Cretaceous–Paleogene Salta Rift phase form heterogeneities that were preferentially reactivated during the Andean orogeny. Constraining the timing and characteristics of reactivation is a key to understanding the interplay between tectonics and inherited crustal anisotropies. In this study, we combine structural and sedimentological field data with a low‐temperature thermochronology data set from the area surrounding the fault‐bounded Cianzo basin. The southeastern boundary is formed by the inverted Hornocal fault, which was the basin‐bounding normal fault of the Lomas de Olmedo sub‐basin (Salta Rift basin). Lacustrine deposits of the Yacoraite Formation overspill on the footwall of this fault and mark tectonic quiescence during the post‐rift phase of the Salta Rift. Apatite (U‐Th‐Sm)/He and fission track ages in the Hornocal fault hanging wall show an onset of rapid cooling interpreted to be concomitant with fault inversion between the latest Oligocene and middle Miocene (∼24–15 Ma). Low‐temperature thermochronology data also constrain the timing of major folding in the eastern limb of the Cianzo syncline to pre‐10 Ma, whereas the western limb started tilting post‐10 Ma. Characterization of exhumation patterns related to fault activity surrounding the Cianzo basin emphasizes the influence of the pre‐existing structural framework on deformation in fold‐and‐thrust belts.

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Section: Discussionmentioning

confidence: 83%

Structural Inheritance in the Eastern Cordillera, NW Argentina: Low‐Temperature Thermochronology of the Cianzo Basin

van Kooten,

Vallati,

Sobel

et al. 2024

Tectonics

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“…The palaeontological record includes gastropods, ostracods, avian and non-avian dinosaur tracks and few preserved palynomorphs that agree with a Maastrichtian-Danian age for the formation [31,32,35,55,[63][64][65][66][67][68][69][70][71][72][73][74][75]. A recent U-Pb zircon geochronology survey on interbedded volcanic ash layers established a sedimentation time between 68.1 ± 0.9 Ma and 62.3 ± 0.5 Ma [40].…”

Section: Geological Contextmentioning

confidence: 99%

“…Microbial spherules were observed in various stromatolite buildups in the Yacoraite Fm. [75,76,104] and consist of sphericalto-elliptical particles, up to 1-2 mm size, which are composed of a fine-grained nucleus surrounded by a cortex of radiating crystals (Figure 9A) of either aragonite or calcite [103]. Spherulitic particles from sample UJ49 do not show any nucleus or crystals radiating from the core (Figure 9) but rather host geopetal and internal sediments (Figure 4C,D), and sometimes partially preserve a former external rim of calcite (Figure 4C).…”

Section: Spherulites From the Yacoraite Fmmentioning

confidence: 99%

A Lacustrine Record for the Cretaceous–Paleogene Boundary—Yacoraite Fm., (Northwest Argentina)

et al. 2023

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The Yacoraite Fm. (Salta rift basin, Argentina) consists of a mixed carbonate–siliciclastic lacustrine succession, interbedded with volcanic ash layers and organised in four third-order stratigraphic sequences. It is one of the few sites in South America that encompass the Cretaceous–Paleogene (K–Pg) transition, the position of which remains debated. Here, samples were collected along a depocentral stratigraphic section that was previously dated by zircon and carbonate U-Pb geochronology. The consistency between zircon and carbonate U-Pb ages, together with an accurate petrographic analysis, allowed the selection of carbonates potentially preserving the original geochemical signature. Accordingly, C-O stable isotopes were analysed from microbialites, oncoids, ooids and lacustrine cements. The available depositional age model from zircon geochronology defined the stratigraphic interval, potentially including the K–Pg transition. Within this interval, carbonates provided negative δ13C values consistent with the negative C anomaly recorded in various K–Pg sites elsewhere. Additionally, spherical particles resembling spherulites related to meteorite impacts were found in two samples. Accordingly, the K–Pg transition could be placed at the top of the second stratigraphic sequence. These findings encourage further investigation of the Yacoraite Fm. to gain insights into the response of South American terrestrial settings to the K–Pg palaeoenvironmental crisis.

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Constructing high-resolution stratigraphic frameworks by the application of signal analysis techniques: Example of Balbuena IV sequence, Yacoraite formation, Salta Basin

Oliveira Santos,

Uhlein,

Dantas

et al. 2023

Marine and Petroleum Geology

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Ostracods from upper Yacoraite Formation (Danian), Salta Basin, Western Argentina: Taxonomy and paleoenvironmental indicators of climatic signals in lacustrine deposits

Cited by 5 publications

References 18 publications

Structural Inheritance in the Eastern Cordillera, NW Argentina: Low‐Temperature Thermochronology of the Cianzo Basin

Structural Inheritance in the Eastern Cordillera, NW Argentina: Low‐Temperature Thermochronology of the Cianzo Basin

A Lacustrine Record for the Cretaceous–Paleogene Boundary—Yacoraite Fm., (Northwest Argentina)

Constructing high-resolution stratigraphic frameworks by the application of signal analysis techniques: Example of Balbuena IV sequence, Yacoraite formation, Salta Basin

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