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Earth's geological history is punctuated by episodes of unusually protracted and large-scale volcanic activity, during which huge volumes of igneous rock are added to Earth's surface and crust. Humans have not witnessed this type of large-scale volcanic activity, known as large igneous province volcanism, but it is often temporally associated with profound environmental and climatic changes, such as mass extinction events. In order to understand what triggers these global changes, we need to consider the fluxes of particles and gas emitted by large igneous province-scale volcanic activity and match our projections with the signals left in the geological record. This is a challenging endeavour and this chapter discusses how evidence from today's active volcanoes can teach us not just about the present-day impact of volcanism, but also about these much larger volcanic eruptions that happened tens to hundreds of millions of years ago. The author argues that by peering into volcanoes, we can shed new light on enigmas surrounding the evolution of Earth's environment and biology over its deep geological history.

Concentrations of mercury were measured in soil and two species of epilithic macrolichens (Umbilicaria decussata and Usnea antarctica) collected along of the coast of northern Victoria Land coast. Most of the soil samples had a very low mercury content, whereas lichens had levels higher than in other remote areas. Although a possible contamination of samples cannot be completely excluded, the relevance to bioaccumulation of the very slow growth rate of lichens and of volcanic activity are discussed.

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7 - Eruptions, Emissions, and Enigmas: From Fuming Volcanic Vents to Mass Extinction Events

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Preliminary data on enviornmental distribution of mercury in northern Victoria Land, Antarctica

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2 results

7 - Eruptions, Emissions, and Enigmas: From Fuming Volcanic Vents to Mass Extinction Events

Summary

Preliminary data on enviornmental distribution of mercury in northern Victoria Land, Antarctica