Late Ordovician climate change and extinctions driven by elevated volcanic nutrient supply

  title={Late Ordovician climate change and extinctions driven by elevated volcanic nutrient supply},
  author={Jack Longman and Benjamin J. W. Mills and Hayley R. Manners and Thomas M. Gernon and Martin R. Palmer},
  journal={Nature Geoscience},
  pages={924 - 929}
The Late Ordovician (~459–444 million years ago) was characterized by global cooling, glaciation and severe mass extinction. These events may have been driven by increased delivery of the nutrient phosphorus (P) to the ocean and associated increases in marine productivity, but it is not clear why this occurred in the two pulses identified in the geological record. We link both cooling phases—and the extinction—to volcanic eruptions through marine deposition of nutrient-rich ash and the… 

A nutrient control on expanded anoxia and global cooling during the Late Ordovician mass extinction

Expanded ocean anoxia and global cooling have been invoked as major causal mechanisms for the Late Ordovician mass extinction, but the factors underpinning the extinction remain unresolved. Here, we

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The Middle‒Late Mesozoic massive volcanism formed a considerable thickness of volcanic‐sedimentary strata in western Liaoning, northern China. Concomitantly, it elevated phosphorus (P) availability

Terrestrial forcing of marine biodiversification

The diversification of the three major marine faunas during the Phanerozoic was intimately coupled to the evolution of the biogeochemical cycles of carbon and nutrients via nutrient runoff from land

prediction of atmospheric CO 2 content from the Phanerozoic earth system box models.

: Over geological timescales, Earth’s atmospheric CO 2 concentration is determined by the long-term carbon cycle. Here the principal CO 2 sources are tectonic degassing and the weathering of

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Different controls on the Hg spikes linked the two pulses of the Late Ordovician mass extinction in South China

The Late Ordovician mass extinction (LOME, ca. 445 Ma; Hirnantian stage) is the second most severe biological crisis of the entire Phanerozoic. The LOME has been subdivided into two pulses

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Seawater sources of Hg enrichment in Ordovician-Silurian boundary strata, South China



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The Late Ordovician mass extinction (LOME), one of the five largest Phanerozoic biodiversity depletions, occurred in two pulses associated with the expansion and contraction of ice sheets on Gondwana

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It is shown that global flare-ups in continental arc magmatism also enhance the global flux of nutrients into the ocean through production of windblown ash, with soluble Si, Fe and P inputs from ash alone in the Cretaceous being higher than the combined input of dust and rivers today.

A high-resolution record of early Paleozoic climate

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The Hirnantian ocean anoxic event (HOAE) onset is coincident with the extinction pulse indicating its importance in triggering it, and it is interpreted that anoxia was driven by global cooling, which reorganized thermohaline circulation, decreased deep-ocean ventilation, enhanced nutrient fluxes, stimulated productivity, which lead to expanded oxygen minimum zones.

The Magnitude and Duration of Late Ordovician–Early Silurian Glaciation

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Siberian Traps flood basalt magmatism coincided with the end-Permian mass extinction approximately 252 million years ago. Proposed links between magmatism and ecological catastrophe include global

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Research in the Pacific Ocean gyres indicates that biological P uptake rates far surpass the combined input from atmospheric and deep water sources, suggesting that P is efficiently recycled within oligotrophic euphotic zones.