Changing Inputs of Continental and Submarine Weathering Sources of Sr to the Oceans during OAE 2

Yobo, Lucien Nana; Brandon, A. D.; Lau, Kimberly V.; Holmden, Chris; Eldrett, James S

doi:10.46427/gold2020.1889

Cited by 1 publication

(3 citation statements)

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“…The characteristic response at major Cretaceous OAEs is observed as pronounced negative 87 Sr/ 86 Sr excursions. The declines in the 87 Sr/ 86 Sr during both the Early Aptian OAE 1a (or Selli Event) (Jones & Jenkyns, 2001) and the Cenomanian-Turonian OAE 2 (or Bonarelli Event) (Yobo et al, 2021), were likely driven by the sudden increase in mantlesourced submarine volcanism, as both events are synchronous with the genesis of oceanic plateau basalts.…”

Section: Phases Of Sr Evolutionmentioning

confidence: 97%

“…Here, the hydrothermal input is understood as the sum of all mantle-derived Sr input and is not restricted to Sr input from MORB-related hydrothermal sources. We employ a model developed by Yobo et al (2021), where a coupled Sr mass and Sr-isotope mass balance approach was used. The model parameters are derived from modern values but are adapted to the end-Triassic (Table 1).…”

Section: Modeling Sr Flux Perturbations Around the Tjbmentioning

confidence: 99%

“…This way, previous studies, models, and proxy data were considered when modeling the changes in Sr fluxes to the ocean (Z. Yobo et al, 2021). These model scenarios reflect the change in Sr flux with respect to the presumed initial state, and they attempt reproduce the stepwise nature of change and the protracted rise in the 87 Sr/ 86 Sr ratio.…”

Section: Modeling Sr Flux Perturbations Around the Tjbmentioning

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

Preprint

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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) compromised the use of this method. Here we present new high-resolution 87Sr/86Sr data from bulk carbonates in Csővár, a continuous marine section that spans 2.5 Myrs across the TJB. We document a continuing decrease in 87Sr/86Sr the from the late Rhaetian to the ETE, terminated by a 300 kyr interval of no 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 scenario. Aggregating the new dataset 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: Phases Of Sr Evolutionmentioning

confidence: 97%

Section: Modeling Sr Flux Perturbations Around the Tjbmentioning

confidence: 99%

Section: Modeling Sr Flux Perturbations Around the Tjbmentioning

confidence: 99%

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