A Lacustrine Record for the Cretaceous–Paleogene Boundary—Yacoraite Fm., (Northwest Argentina)
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...
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MDPI AG
2023-07-01
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| Series: | Geosciences |
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| Online Access: | https://www.mdpi.com/2076-3263/13/8/227 |
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| author | Damaris Montano Marta Gasparrini Sébastien Rohais Ramon De Luca |
| author_facet | Damaris Montano Marta Gasparrini Sébastien Rohais Ramon De Luca |
| author_sort | Damaris Montano |
| collection | DOAJ |
| description | 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 δ<sup>13</sup>C 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. |
| first_indexed | 2024-03-10T23:54:55Z |
| format | Article |
| id | doaj.art-ff2307d900634ef8899d52f06ba2e390 |
| institution | Directory Open Access Journal |
| issn | 2076-3263 |
| language | English |
| last_indexed | 2024-03-10T23:54:55Z |
| publishDate | 2023-07-01 |
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| record_format | Article |
| series | Geosciences |
| spelling | doaj.art-ff2307d900634ef8899d52f06ba2e3902023-11-19T01:16:51ZengMDPI AGGeosciences2076-32632023-07-0113822710.3390/geosciences13080227A Lacustrine Record for the Cretaceous–Paleogene Boundary—Yacoraite Fm., (Northwest Argentina)Damaris Montano0Marta Gasparrini1Sébastien Rohais2Ramon De Luca3Department of Earth Sciences “Ardito Desio”, Università degli Studi di Milano, Via L. Mangiagalli 34, 20133 Milan, ItalyDepartment of Earth Sciences “Ardito Desio”, Università degli Studi di Milano, Via L. Mangiagalli 34, 20133 Milan, ItalyIFP Energies Nouvelles, 1 et 4 Avenue de Bois-Préau, 92852 Rueil-Malmaison, FranceEarth Sciences Department, Khalifa University of Science and Technology, Abu Dhabi P.O. Box 127788, United Arab EmiratesThe 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 δ<sup>13</sup>C 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.https://www.mdpi.com/2076-3263/13/8/227K–Pg boundarySalta riftSouth AmericaO-C isotopesspherulites |
| spellingShingle | Damaris Montano Marta Gasparrini Sébastien Rohais Ramon De Luca A Lacustrine Record for the Cretaceous–Paleogene Boundary—Yacoraite Fm., (Northwest Argentina) Geosciences K–Pg boundary Salta rift South America O-C isotopes spherulites |
| title | A Lacustrine Record for the Cretaceous–Paleogene Boundary—Yacoraite Fm., (Northwest Argentina) |
| title_full | A Lacustrine Record for the Cretaceous–Paleogene Boundary—Yacoraite Fm., (Northwest Argentina) |
| title_fullStr | A Lacustrine Record for the Cretaceous–Paleogene Boundary—Yacoraite Fm., (Northwest Argentina) |
| title_full_unstemmed | A Lacustrine Record for the Cretaceous–Paleogene Boundary—Yacoraite Fm., (Northwest Argentina) |
| title_short | A Lacustrine Record for the Cretaceous–Paleogene Boundary—Yacoraite Fm., (Northwest Argentina) |
| title_sort | lacustrine record for the cretaceous paleogene boundary yacoraite fm northwest argentina |
| topic | K–Pg boundary Salta rift South America O-C isotopes spherulites |
| url | https://www.mdpi.com/2076-3263/13/8/227 |
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