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 2 publications

(5 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…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%

See 2 more Smart Citations

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

View full text Add to dashboard Cite

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.

show abstract

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%

See 1 more Smart Citation

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

View full text Add to dashboard Cite

show abstract

“…Increases in weathering fluxes were also required in the box modeling of other element cycles, such as Ca, Sr, Os, Li, and S (Blättler et al, 2011;Pogge Von Strandmann et al, 2013;Gomes et al, 2016;Nana Yobo et al, 2021). For example, a threefold increase in weathering flux (Table 2) was required in an oceanic box model of coupled Sr and Ca cycles to explain their behavior during OAE 2 (Blättler et al, 2011).…”

Section: Oaementioning

confidence: 99%

“…Later, the increased factor was revised to be approximately 1-3 times (Table 2) when the Os and Li isotopic variations during the OAE 2 were also considered in a box model of coupled Li and Os cycles (Pogge Von Strandmann et al, 2013). More recently, box modeling of the increases in seawater 87 Sr/ 86 Sr suggested a rise of only 1.8 times in the weathering flux of Sr (Table 2), but with a more significant role of enhanced hydrothermal activity in the event (Nana Yobo et al, 2021).…”

Section: Oaementioning

confidence: 99%

Modeling hyperthermal events in the Mesozoic-Paleogene periods: a review

Zhang,

Mills,

et al. 2023

Front. Ecol. Evol.

View full text Add to dashboard Cite

Hyperthermal events, which are characterized by rapid and extreme warming, occurred at several points throughout the Mesozoic to Paleogene periods. Model simulation studies have been conducted to investigate the mechanisms behind these events, including the carbon fluxes required to drive observed warming and isotope dynamics, the impact of warming on continental weathering, seawater pH, ocean anoxia, and the mechanism that terminated the warming. Studies using simple box models, Earth system box models, or 3D Earth system models have suggested that warming had a significant biogeochemical impact and would enhance continental weathering, increase ocean anoxia, and drive marine acidification. However, the magnitudes of these impacts remain debated and require further modeling work, as do the reconstructions of carbon fluxes and compositions. This review provides an overview of the current state of knowledge on hyperthermal events and proposes possible modeling development directions to better understand the causes and impacts of these events. Particularly, new long-term ‘semi-spatial’ Earth system models are promising tools for providing new solutions and perspectives on the biogeochemical responses to warming events and the carbon fluxes behind hyperthermal events from the Mesozoic to Paleogene periods.

show abstract

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

Cited by 2 publications

References 0 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

Modeling hyperthermal events in the Mesozoic-Paleogene periods: a review

Contact Info

Product

Resources

About