A Chemical Classification of Volcanic Rocks Based on the Total Alkali-Silica Diagram

“…Focussing on a total alkali silica (TAS) diagram, samples from historical eruptions of this study are grouped within the alkaline and subalkaline fields (Fig. 8), matching a wide range of rock series (mainly basalts, trachybasalts, basaltic trachyandesites and trachyandesites) according to the classification of Le Bas et al (1986). Within this trend, there is an additional systematic grouping, i.e.…”

Section: Figmentioning

confidence: 99%

Historic hydrovolcanism at Deception Island (Antarctica): implications for eruption hazards

et al. 2017

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Deception Island (Antarctica) is the southernmost island of the South Shetland Archipelago in the South Atlantic. Volcanic activity since the eighteenth century, along with the latest volcanic unrest episodes in the twentieth and twenty first centuries, demonstrates that the volcanic system is still active and that future eruptions are likely. Despite its remote location, the South Shetland Islands are an important touristic destination during the austral summer. In addition, they host several research stations and three summer field camps. Deception Island is characterised by a Quaternary caldera system with a post caldera succession and is considered to be part of an active, dispersed (monogenetic), volcanic field. Historical post caldera volcanism on Deception Island involves monogenetic small volume (VEI 2-3) eruptions such forming cones and various types of hydrovolcanic edifices. The scientific stations on the island were destroyed, or severely damaged, during the eruptions in 1967, 1969, and 1970 mainly due to explosive activity triggered by the interaction of rising (or erupting) magma with surface water, shallow groundwater, and ice. We conducted a detailed revision (field petrology and geochemistry) of the historical hydrovolcanic post caldera eruptions of Deception Island with the aim to understand the dynamics of magma water interaction, as well as characterise the most likely eruptive scenarios from future eruptions. We specifically focused on the Crimson Hill (estimated age between 1825 and 1829), and Kroner Lake (estimated age between 1829 and 1912) eruptions and 1967, 1969, and 1970 events by describing the eruption mechanisms related to the island's hydrovolcanic activity. Data suggest that the main hazards posed by volcanism on the island are due to fallout, ballistic blocks and bombs, and subordinate, dilute PDCs. In addition, Deception Island can be divided into five areas of expected activity due to magma water interaction, providing additional data for correct hazard assessment on the island.

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“…7 Fig. 8a; Le Bas et al, 1986). It is a reasonable assumption that some mobile elements (e.g., Na and K) may have been remobilized by later alteration based on the moderate to high loss on ignition (LOI).…”

Section: Whole-rock Major and Trace Elementsmentioning

confidence: 99%

2.24 Ga mafic dykes from Taihua Complex, southern Trans-North China Orogen, and their tectonic implications

Han

Chen

Yao

et al. 2015

Precambrian Research

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A Chemical Classification of Volcanic Rocks Based on the Total Alkali-Silica Diagram

Cited by 5,488 publications

References 9 publications

Geochemical variations in Miocene adakitic rocks from the western and eastern Lhasa terrane: Implications for lower crustal flow beneath the Southern Tibetan Plateau

Geochemical variations in Miocene adakitic rocks from the western and eastern Lhasa terrane: Implications for lower crustal flow beneath the Southern Tibetan Plateau

Historic hydrovolcanism at Deception Island (Antarctica): implications for eruption hazards

2.24 Ga mafic dykes from Taihua Complex, southern Trans-North China Orogen, and their tectonic implications

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