Late Ordovician mass extinction caused by volcanism, warming, and anoxia, not cooling and glaciation

  title={Late Ordovician mass extinction caused by volcanism, warming, and anoxia, not cooling and glaciation},
  author={David P. G. Bond and Stephen E. Grasby},
The Ordovician saw major diversification in marine life abruptly terminated by the Late Ordovician mass extinction (LOME). Around 85% of species were eliminated in two pulses 1 m.y. apart. The first pulse, in the basal Hirnantian, has been linked to cooling and Gondwanan glaciation. The second pulse, later in the Hirnantian, is attributed to warming and anoxia. Previously reported mercury (Hg) spikes in Nevada (USA), South China, and Poland implicate an unknown large igneous province (LIP) in… 
Major volcanic eruptions linked to the Late Ordovician mass extinction: Evidence from mercury enrichment and Hg isotopes
Abstract The Late Ordovician mass extinction (LOME) was the second most severe Phanerozoic biodiversity crisis. While environmental deterioration and oceanographic changes associated with the
Volcanism-induced late Boda warming in the Late Ordovician: Evidence from the Upper Yangtze Platform, South China
Abstract Late Boda warming was the last warm episode in the Late Ordovician, and little is known about its cause. Volcanism was a hypothetical candidate that triggered this warming event owing to its
Sulfidic anoxia in the oceans during the Late Ordovician mass extinctions – insights from molybdenum and uranium isotopic global redox proxies
The Late Ordovician Mass Extinction wiped out 85% of animal species in two phases (LOME1 and LOME2). The kill mechanisms for the extinction phases are debated, but deteriorating climate and the
Mercury linked to Deccan Traps volcanism, climate change and the end-Cretaceous mass extinction
Abstract Mercury (Hg) anomalies linked to Large Igneous Provinces (LIP) volcanism have been identified in sediments across all five major mass extinctions in Earth's history. This study tests whether
Redox changes in the outer Yangtze Sea (South China) through the Hirnantian Glaciation and their implications for the end-Ordovician biocrisis
Abstract Two pulses of faunal mortality occurred during the Late Ordovician mass extinction (ca. 445 Ma). This biocrisis is recorded in Hirnantian strata of South China as a stepwise extinction of
High-frequency redox variation across the Ordovician–Silurian transition, South China
Abstract Mass extinction and extensive black shale deposition were associated with widespread ocean anoxia during the Ordovician–Silurian transitional interval, yet uncertainty among trace-metal
Ordovician palaeogeography and climate change
Abstract New palaeogeographical reconstructions for the earlier Ordovician (480 Ma), and later Ordovician (450 Ma) integrate revised longitude-calibrated palaeomagnetic reconstructions and the
Late Ordovician mass extinction caused by global warming or cooling?
The Late Ordovician mass extinction (LOME) was the first global extinction with the destruction of 85 % of marine species. However, the cause of LOME is still controversial. Most studies attribute it
Timing and patterns of the Great Ordovician Biodiversification Event and Late Ordovician mass extinction: Perspectives from South China
Abstract The early Paleozoic sediments document two major biological events: the Great Ordovician Biodiversification Event (GOBE) and Late Ordovician mass extinction (LOME). Many investigations have
Responses of oceanic chemistry to climatic perturbations during the Ordovician-Silurian transition: Implications for geochemical proxies and organic accumulations
Abstract The organic-rich sediments deposited in the Ordovician-Silurian transition (OST) on the Yangtze Platform not only represent significant shale gas sources, but also record information on the


A volcanic trigger for the Late Ordovician mass extinction? Mercury data from south China and Laurentia
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
Mercury spikes suggest volcanic driver of the Ordovician-Silurian mass extinction
The results suggest intense volcanism occurred during the Late Ordovician, and as in other Phanerozoic extinctions, likely played an important role in the O-S event.
A sulfidic driver for the end-Ordovician mass extinction
The end-Ordovician extinction consisted of two discrete pulses, both linked, in various ways, to glaciation at the South Pole. The first phase, starting just below the Normalograptus extraordinarius
Large igneous provinces and mass extinctions: An update
The temporal link between mass extinctions and large igneous provinces is well known. Here, we examine this link by focusing on the potential climatic effects of large igneous province eruptions
Mercury Spikes Indicate a Volcanic Trigger for the Late Ordovician Mass Extinction Event: An Example from a Deep Shelf of the Peri-Baltic Region
It is concluded that Hg and Hg/TOC values were associated with volcanic pulses which triggered the massive environmental changes resulting in the Late Ordovician mass extinction.
Modeling the early Paleozoic long-term climatic trend
The early Paleozoic climate has been described as warm and equable. However, recent data based on conodont oxygen isotopic composition reveal a large, long, cooling trend through the Ordovician,
Mercury in marine Ordovician/Silurian boundary sections of South China is sulfide-hosted and non-volcanic in origin
Abstract Mercury (Hg) enrichment in stratigraphic successions is now widely used as a proxy for volcanic inputs, often for the purpose of documenting a relationship between large igneous province
Mercury as a proxy for volcanic emissions in the geologic record
Abstract Large igneous province (LIP) eruptions are increasingly considered to have driven mass extinction events throughout the Phanerozoic; however, uncertainties in radiometric age dating of LIP
Changes in marine productivity and redox conditions during the Late Ordovician Hirnantian glaciation
Abstract Changes in marine productivity and redox conditions during the end-Ordovician (Hirnantian) glaciation and Ordovician–Silurian transition were investigated through Mo-isotope and major- and
Origination, extinction, and mass depletions of marine diversity
Abstract In post-Cambrian time, five events—the end-Ordovician, end-Frasnian in the Late Devonian, end-Permian, end-Triassic, and end-Cretaceous—are commonly grouped as the “big five” global