Preservation of orbital forcing in intraplatform carbonates and an astronomical time frame for a multiproxy record of end-Triassic global change from a western Tethyan section (Csővár, Hungary)

Vallner, Zsolt; Kovács, Emma Blanka; Haas, János; Móricz, Ferenc; Ruhl, Micha; Zajzon, Norbert; Pálfy, József

doi:10.1016/j.palaeo.2023.111493

Cited by 4 publications

(17 citation statements)

References 74 publications

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“…The 87 Sr/ 86 Sr profile of the Csővár section exhibit only gradual changes (Figure 2), which is typical of sedimentary sequences without stratigraphic gaps (Jones et al., 1994). The Sr isotope data, generated here for 2.5 Myr within the T‐J transition (Vallner et al., 2023), records subtle shifts in the 87 Sr/ 86 Sr ratio that likely reflect the long‐term global trend in the Sr isotope ratio. On the other hand, sudden changes, commonly less than 1 Myr in duration, may represent local changes in weathering or alteration of the original 87 Sr/ 86 Sr compositions (Richter & Turekian, 1993).…”

Section: Discussionmentioning

confidence: 96%

“…In total, 70 samples were chosen for 87 Sr/ 86 Sr isotope measurements and elemental characterization. The sampled levels are identical to, but represent a selected subset of, those previously used to generate a high‐resolution δ 13 C carb curve (E. B. Kovács et al., 2020) and carry out a cyclostratigraphical analysis (Vallner et al., 2023). The sample spacing is intentionally uneven, 20 cm around the ETE and TJB but less dense below and above.…”

Section: Methodsmentioning

confidence: 99%

“…Thus, an astrochronological age model was developed for the approximately 52 m thick measured section, suggesting that it was deposited in 2.9–3 Myr, with an average sedimentation rate of 1.73–1.79 cm/kyr. Combining the cyclostratigraphy with previously published bio‐ and chemostratigraphical data allows the placement of the TJB at 21.8–22.2 m (i.e., Beds 58–59) (Vallner et al., 2023).…”

Section: Geological and Stratigraphic Settingmentioning

confidence: 99%

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Marine Strontium Isotope Evolution at the Triassic‐Jurassic Transition Links Transient Changes in Continental Weathering to Volcanism of the Central Atlantic Magmatic Province

Heszler,

Katchinoff,

Palcsu

et al. 2024

Geochem Geophys Geosyst

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The end‐Triassic extinction (ETE) is one of the most severe biotic crises in the Phanerozoic. This event was synchronous with volcanism of the Central Atlantic Magmatic Province (CAMP), the ultimate cause of the extinction and related environmental perturbations. However, the continental weathering response to CAMP‐induced warming remains poorly constrained. Strontium isotope stratigraphy is a powerful correlation tool that can also provide insights into the changes in weathering regime, but the scarcity of 87Sr/86Sr data across the Triassic‐Jurassic boundary (TJB) hindered the use of this method. Here we present new high‐resolution 87Sr/86Sr data from bulk carbonates at Csővár, a continuous marine section that spans 2.5 Myrs across the TJB. We document a continuing decrease in 87Sr/86Sr ratio from the late Rhaetian to the ETE, terminated by a 300 kyr interval of a flat trend and followed by a transient increase in the early Hettangian that levels off. We suggest that the first in the series of perturbations is linked to the influx of non‐radiogenic Sr from the weathering of freshly erupted CAMP basalts, leading to a delay in the radiogenic continental weathering response. The subsequent rise in 87Sr/86Sr after the TJB is explained by intensified continental crustal weathering from elevated CO2 levels and reduced mantle‐derived Sr flux. Using Sr flux modeling, we also find support for such multiphase, prolonged continental weathering scenarios. Aggregating the new data set with published records employing an astrochronological age model results in a highly resolved Sr isotope reference curve for an 8.5 Myr interval around the TJB.

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Section: Discussionmentioning

confidence: 96%

Section: Methodsmentioning

confidence: 99%

Section: Geological and Stratigraphic Settingmentioning

confidence: 99%

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Marine Strontium Isotope Evolution at the Triassic‐Jurassic Transition Links Transient Changes in Continental Weathering to Volcanism of the Central Atlantic Magmatic Province

Heszler,

Katchinoff,

Palcsu

et al. 2024

Geochem Geophys Geosyst

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“…These cyclic sea level uctuations are hypothesized to be of a few metres to 15 m in amplitude (Fischer 1964;Haas 1994;Balog et al 1997) and commonly associated with orbitally forced eustatic sea-level variations (Sander 1936;Schwarzacher 1954Schwarzacher , 1993Schwarzacher , 2005Fischer 1964Fischer , 1975Fischer , 1991Haas 1982Haas , 1991Haas , 1994 In addition, ˝megamonsoon˝-driven aquifer-and limno-eustasy is proposed from the partly coeval intraplatform Csővár basin that was located on the outer part of the Dachstein platform system in the Transdanubian Range (Vallner et al 2023).…”

Section: Cyclic Depositional Modelmentioning

confidence: 99%

“…These deposits consist of calciturbidites that were sourced primarily from the adjacent platforms (Vallner et al 2023). As Milankovitch cyclicity was identi ed in several of these deposits (Mesetti et likely that the deposition in the platforms and the adjacent basins were both paced by the same orbital cycles.…”

Section: Referencementioning

confidence: 99%

Definitive orbital control on the origin and preservation of Lofer cyclicity in the Late Triassic Dachstein platform

Vallner,

Haas,

Pálfy

2024

Preprint

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The Upper Triassic Dachstein Limestone is an archetypal example of platform carbonate formation that consists of peritidal-subtidal Lofer cycles. However, despite a long history of study, their allocyclic vs autocyclic origin remains controversial. Using modern cyclostratigraphic methodology, here we revisit the archive data of the Dachstein Limestone in core Po-89 from the Transdanubian Range, Hungary. Analysis of high-resolution time series of the Lofer facies types, colour, greyscale, and lithology revealed several spectral peaks that are identified with the Milankovitch cycles. The Lofer cycles correspond to a robust peak with a period of 3.6 m that is the expression of precession cycles with a period 21.65 kyr. The sedimentary rate is 16.5 cm/kyr, thus the studied core section represents 2.5 Myr. Our model of cyclic carbonate deposition suggests that aquifer- and limno-eustasy were the most likely drivers of cyclic sea level changes. Differences in the depositional processes and preservation of the Lofer cycles led to variations in their completeness that is also orbitally controlled and responds primarily to long eccentricity forcing. We detected several sub-Milankovitch cycles, of which the 13.5, 7, 5, 3.4, 2.4, and 1.48 kyr cycles are the most prominent. Our results are in good agreement with other studies of Upper Triassic Lofer cyclic successions. The similarities in the thickness of individual Lofer cycles, the periods of all identified cycles, and the sedimentary rates suggest common allocyclic processes. Our findings provide definitive evidence for the orbital forcing of carbonate sedimentation in the Late Triassic Dachstein platform system.

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Upper Carnian to Rhaetian (Upper Triassic) conodont and carbon-isotope stratigraphy of the Csővár borehole succession, Hungary

Karádi,

Korte

2023

Palaeogeography, Palaeoclimatology, Palaeoecology

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Preservation of orbital forcing in intraplatform carbonates and an astronomical time frame for a multiproxy record of end-Triassic global change from a western Tethyan section (Csővár, Hungary)

Cited by 4 publications

References 74 publications

Marine Strontium Isotope Evolution at the Triassic‐Jurassic Transition Links Transient Changes in Continental Weathering to Volcanism of the Central Atlantic Magmatic Province

Marine Strontium Isotope Evolution at the Triassic‐Jurassic Transition Links Transient Changes in Continental Weathering to Volcanism of the Central Atlantic Magmatic Province

Definitive orbital control on the origin and preservation of Lofer cyclicity in the Late Triassic Dachstein platform

Upper Carnian to Rhaetian (Upper Triassic) conodont and carbon-isotope stratigraphy of the Csővár borehole succession, Hungary

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