Gabbroic enclave in intermediate ignimbrites: The youngest eruptive event in the northern Luzon Arc-Taiwan region

The concomitant activation off all four summit craters of Mt. Etna during the December 2015 eruptive event allow us to investigate the chemical-physical crystallization conditions and magma dynamics in the shallower portion of the open-conduit feeding system. In this study, we discuss new petrological, geochemical and thermo-barometric data as well as the composition of major element and volatile content (H2O, CO2, F, Cl and S) of olivine-hosted melt inclusions from the explosive and effusive products emitted during the December 2015 eruptive event.Results and rhyolite-MELTS thermodynamic modelling of mineral phase stability highlight the relatively shallow crystal equilibrium depth prior to the eruption ranging from 400-500 MPa for Central Crater and North East Crater, up to 200 MPa below the New South East Crater. The study of high-pressure and high-temperature homogenized olivine-hosted melt inclusions allowed us to identify the composition of the almost primary alkali-basalt magma (11.8 wt% MgO) containing up to 4.9 wt% and 8151 ppm of H2O and CO2 respectively. The results, together with those already reported for the previous paroxystic events of the 2011-2012 (Giacomoni et al., 2018), reinforce the model of a vertically extended feeding system and highlight that the activity at the New South East Crater was fed by a magma residing at significant shallower depth with respect to Central Craters and North East Crater, although all conduits are fed by a common deep (P = 530-440 MPa) basic magmatic refilling. Plagioclase stability model and dissolution and resorption textures confirm its dependence on H2O content, thus suggesting that further studies on the effect that flushing from fluids with different H2O/CO2 ratio are needed in order to understand the eruption triggering mechanisms of paroxystic fountaining.&#160;ReferencesGiacomoni P., Coltorti M., Mollo S., Ferlito C., Braiato M., Scarlato P. 2018. The 2011-2012 paroxysmal eruptions at Mt. Etna volcano: Insights on the vertically zoned plumbing system. JVGR 349, 370-391.

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Decolonizing the Anthropocene: ‘Slow Violence’ and Indigenous Resistance in Cherie Dimaline’s The Marrow Thieves

Il Tolomeo ◽

10.30687/tol/2499-5975/2020/22/022 ◽

2020 ◽

Author(s):

Chiara Xausa

Keyword(s):

Climate Change ◽

Global Warming ◽

Young Adult ◽

Species Level ◽

Literary Representations ◽

Indigenous Resistance ◽

Eruptive Event ◽

Young Adult Novel ◽

Indigenous Theory ◽

Slow Violence

Through a reading of Cherie Dimaline’s 2017 young adult novel The Marrow Thieves, a survival story set in a futuristic Canada destroyed by global warming, this article explores the conceptualization and reimagination of the Anthropocene in contemporary postcolonial and Indigenous theory and fiction. Firstly, I will argue that literary representations of climate change can be complicit in producing hegemonic strands of Anthropocene discourse that consider human destructiveness and vulnerability at undifferentiated species level. Secondly, I will suggest that the novel’s apocalypse reveals the processes of colonial violence and dispossession that have culminated in the eruptive event of environmental catastrophe, rather than portraying a story of universal and disembodied human threat that conceals oppression against Indigenous people.

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