Journal: GSA Today

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Geological Society of America

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1052-5173
1943-2690

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2016 - 201922020 - 20222
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Publications 1 - 4 of 4
  • Continental Magmatism and Uplift as the Primary Driver for First-Order Oceanic 87Sr/86Sr Variability with Implications for Global Climate and Atmospheric Oxygenation
    Item type: Journal Article
    Paulsen, Timothy; Deering, Chad; Sliwinski, Jakub; et al. (2022)
    GSA Today
    Oceans cover 70% of Earth's surface, setting it apart from the other terrestrial planets in the solar system, but the mechanisms driving oceanic chemical evolution through time remain an important unresolved problem. Imbalance in the strontium cycle, introduced, for example, by increases in continental weathering associated with mountain building, has been inferred from shifts in marine carbonate 87Sr/86Sr ratios. There are, however, uncertainties about the spatial and temporal patterns of crustal evolution in Earth's past, particularly for the period leading up to the Cambrian explosion of life. Here we show that U-Pb age and trace element data from a global compilation of detrital zircons are consistent with marine carbonate 87Sr/86Sr ratios, suggesting changes in radiogenic continental input into Earth's oceans over time. Increases in riverine Sr input were related to the break-up and dispersal of continents, with increased weathering and erosion of a higher proportion of radiogenic rocks and high-elevation continental crust. Tectonic processes exert a strong influence on the chemical evolution of the planet's oceans over geologic time scales and may have been a key driver for concomitant increases in atmosphere-ocean oxygenation and global climate cooling.
  • Dynamics and legacy of 4.8 ka rock avalanche that dammed Zion Canyon, Utah, USA
    Item type: Journal Article
    Castleton, Jessica J.; Moore, Jeffrey R.; Aaron, Jordan; et al. (2016)
    GSA Today
  • Earth evolution, emergence, and uniformitarianism
    Item type: Other Journal Item
    Stern, Robert J.; Gerya, Taras (2021)
    GSA Today
  • Late miocene uplift of the Tian Shan and Altai and reorganization of Central Asia climate
    Item type: Journal Article
    Caves, Jeremy K.; Bayshashov, Bolat U.; Zhamangara, Aizhan; et al. (2017)
    GSA Today
Publications 1 - 4 of 4