δD and δ18O variations of the magmatic system beneath Deception Island volcano (Antarctica): Implications for magma ascent and eruption forecasting

Noble gas isotopes reveal degassing-derived eruptions at Deception Island (Antarctica): implications for the current high levels of volcanic activity

“…The δD information in the phenocrysts, which is essential for understanding the origin of water from magma source at depth to its eruption in active volcanic systems, reveals that most of the Deception Island magmas 19 match the range of the MORB mantle 44 and other magmatic sources such as Koolau and Baffin Island considered to retain primitive D/H values 45 . In fact, the Deception Island magmas exhibit near invariant D/H values with variable extents of partial melting 19 , 46 . In summary, the He isotopic signal measured on the island’s surface reflect the pristine MORB origin of the magmas feeding the eruptions.…”

“…Kusakabe et al (2009) reported δD and δ 18 O of the fumarolic fluids with values that ranged between seawater to local meteoric water (freshwater from crater lakes, ponds and glacier meltwater), which contrasts with the magmatic signatures of magmatic waters in the phenocryst inclusions 19 . However, 3 He/ 4 He values in the hot-spring and fumarolic fluids indicate MORB-like components.…”

“…The main volcanic hazards expected in the island henceforth are considered to be related to explosive hydrovolcanic eruptions due to a rapidly ascending magma interacting with meteoric and glacial surface water, the aquifer or seawater (e.g., 13 , 19 ). The last historic eruptions have ejected ash, lapilli and bombs, subordinate dilute pyroclastic density currents and destabilization driven mass wasting (e.g.…”

Imaging the Absorbing Feeding and Eruptive Pathways of Deception Island, Antarctica

“…There is extensive geophysical evidence of the effect of the NNW‐SSE‐striking tectonics on the magmatic and hydrothermal activity on the island (Álvarez‐Valero et al., 2020; Zandomeneghi et al., 2009). The wider absorption pattern largely corresponds to the area of uplift inside the basin (Cooper et al., 1998).…”

Geomorphology of the post-caldera monogenetic volcanoes at Deception Island, Antarctica — Implications for landform recognition and volcanic hazard assessment

“…Deception Island, South Shetland Archipelago, is one of the most active volcanoes in Antarctica (Orheim, 1972;Bartolini et al, 2014;Geyer et al, 2019). It is characterised by a central collapse caldera with an abundance of monogenetic post-caldera tuff cones and rings formed from explosive magma-water interactions (Baker et al, 1975;Smellie, 2002;Pedrazzi et al, 2014aPedrazzi et al, , 2018Álvarez-Valero et al, 2020). More than 20 eruptions have been registered at Deception Island over the past two centuries (Orheim, 1972;Roobol, 1982;, demonstrating that the occurrence of a new eruption is fully plausible-being a con cern for tourists, scientists, and the logistics personnel working on or near the island.…”