A mid-latitude Maastrichtian palynological record from the Yacoraite Formation (Salta Group), northwestern Argentina

Llorens, Magdalena; Loinaze, Valeria Susana Pérez; Narváez, Paula Liliana; Zelaya, Alfredo M.; Pincheira, Egly Pérez; Gorustovich, Sergio

doi:10.1016/j.cretres.2022.105332

Cited by 8 publications

(7 citation statements)

References 37 publications

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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: 95%

“…Both hypotheses are disproved by the presence of Danian palynomorphs at the top of the Yacoraite Fm. [32,66,92]. The following studies suggest that the K-Pg transition should be placed within Sequences 2 or 3, since abrupt lithologic and geochemical changes are found in this stratigraphic interval: [35,36,38].…”

Section: K-pg Transition In the Yacoraite Fmmentioning

confidence: 99%

“…However, the calcareous composition of the Yacoraite Fm. limited palynomorph preservation, and thus, only a few palynomorphs have been recovered, one in the western part of the Alemania sub-basin (Don Otto mine section), and one from the Lomas de Olmedo sub-basin [32,66,92] (Figure 1B). The Yacoraite Fm.…”

Section: K-pg Transition In the Yacoraite Fmmentioning

confidence: 99%

“…The Yacoraite Fm. is known to host well-preserved Senonian dinosaur ichnofossils, which were found in the costal domains of the Tres Cruces sub-basin, e.g., [31,32,35,64,65,67,74]. By correlating these biostratigraphic data along the Juramento section, it can be derived that the K-Pg transition should be preserved in a ~90 m thick (~130-220 m) stratigraphic interval included between the middle of Sequence 2 and the middle of Sequence 4.…”

Section: K-pg Transition In the Yacoraite Fmmentioning

confidence: 99%

“…is a Maastrichtian-Danian lacustrine sedimentary succession from the Salta Rift Basin (NW Argentina; Figure 1B) consisting of carbonate and siliciclastic deposits interbedded with volcanic ash layers, e.g., [29,30]. The succession represents a distal K-Pg site from South America since it encompasses the K-Pg transition, e.g., [31,32], and it is located >5000 Km from the Chicxulub crater [33]; Figure 1A). Such sites are particularly relevant for assessing climate and biotic conditions in correspondence with the K-Pg crisis because they were not influenced by the immediate force of the meteorite impact.…”

Section: Introductionmentioning

confidence: 99%

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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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