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July 26, 2026Geology

Magnesium isotopes reveal hydroclimatically amplified low-latitude weathering during the early Toarcian

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Authors

ZHZhong HanZHZhongya HuJGJiaqi Guo

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Overview

Randomized trial examines the effects of carbon emissions on weathering in low-latitude regions, suggesting significant climate impacts.

Key Points

  • To investigate the response of low-latitude silicate weathering to extreme warming during the Toarcian Stage.
  • Analyzed magnesium isotopes (δ26Mg) from carbonate-hosted silicates across two low-latitude carbonate platforms.
  • Correlated isotopic excursions with geological events such as the Pliensbachian−Toarcian boundary and Karoo LIP activity.
  • Utilized climate simulations from the Community Earth System Model to assess weathering dynamics.
  • Positive δ26Mg excursions indicating intensified continental weathering were observed at the Pl−To boundary.
  • δ26Mg values peaked during the T-OAE NCIE onset, showcasing the cumulative effects of carbon emissions on weathering.
  • Extreme temperatures and runoff led to soil stripping and intensified chemical weathering in tectonically inactive regions.

Cite This Study

Han et al. (2026) studied this question.

synapsesocial.com/papers/6a65a825d3aea3239cd78a55https://doi.org/10.1130/g54555.1
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