Journal: Bulletin of Volcanology

Abbreviation

Bull. volcanol.

Publisher

Springer

Journal Volumes

ISSN

0258-8900
1432-0819

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Publications 1 - 10 of 31
  • Experimental constraints on the crystallization of natrocarbonatitic lava flows
    Item type: Journal Article
    Mattsson, Hannes B.; Caricchi, Luca (2009)
    Bulletin of Volcanology
  • Voluminous lava flows at Oldoinyo Lengai in 2006
    Item type: Journal Article
    Kervyn, Matthieu; Ernst, Gerald G.J.; Klaudius, Jurgis; et al. (2008)
    Bulletin of Volcanology
  • Obsidian pyroclasts in the Yellowstone-Snake River Plain ignimbrites are dominantly juvenile in origin
    Item type: Journal Article
    Monnereau, L.R.; Ellis, Ben S.; Szymanowski, Dawid; et al. (2021)
    Bulletin of Volcanology
    Dense, glassy pyroclasts found in products of explosive eruptions are commonly employed to investigate volcanic conduit processes through measurement of their volatile inventories. This approach rests upon the tacit assumption that the obsidian clasts are juvenile, that is, genetically related to the erupting magma. Pyroclastic deposits within the Yellowstone-Snake River Plain province almost without exception contain dense, glassy clasts, previously interpreted as hyaloclastite, while other lithologies, including crystallised rhyolite, are extremely rare. We investigate the origin of these dense, glassy clasts from a coupled geochemical and textural perspective combining literature data and case studies from Cougar Point Tuff XIII, Wolverine Creek Tuff, and Mesa Falls Tuff spanning 10 My of silicic volcanism. These results indicate that the trace elemental compositions of the dense glasses mostly overlap with the vesiculated component of each deposit, while being distinct from nearby units, thus indicating that dense glasses are juvenile. Textural complexity of the dense clasts varies across our examples. Cougar Point Tuff XIII contains a remarkable diversity of clast appearances with the same glass composition including obsidian-within-obsidian clasts. Mesa Falls Tuff contains clasts with the same glass compositions but with stark variations in phenocryst content (0 to 45%). Cumulatively, our results support a model where most dense, glassy clasts reflect conduit material that passed through multiple cycles of fracturing and sintering with concurrent mixing of glass and various crystal components. This is in contrast to previous interpretations of these clasts as entrained hyaloclastite and relaxes the requirement for water-magma interaction within the eruptive centres of the Yellowstone-Snake River Plain province.
  • Magma evolution of Quaternary minor volcanic centres in southern Peru, Central Andes
    Item type: Journal Article
    Delacour, Adelie; Gerbe, Marie-Christine; Thouret, Jean-Claude; et al. (2007)
    Bulletin of Volcanology
  • Scales of columnar jointing in igneous rocks: field measurements and controlling factors
    Item type: Journal Article
    Hetényi, György; Taisne, Benoît; Garel, Fanny; et al. (2012)
    Bulletin of Volcanology
  • The use of biotite trace element compositions for fingerprinting magma batches at Las Cañadas volcano, Tenerife
    Item type: Journal Article
    Sliwinski, Jakub; Ellis, Ben S.; Dávila-Harris, Pablo; et al. (2017)
    Bulletin of Volcanology
    Accurate identification of individual volcanic events in the field is crucial for constraining eruption volumes and calculating recurrence intervals between eruptive episodes. Due to complexities of pyroclastic transport and deposition and intra-unit textural variability, such identification can be challenging. We present a novel method for fingerprinting ignimbrites via trace element chemistry (V, Co, Nb) in biotite by laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). Using samples from the alkaline magmatic series of Tenerife, we are able to demonstrate (1) clustering of previously characterized units into distinct, homogeneous groups based on V, Co, and Nb concentrations in biotite, despite the presence of extreme variation and zonation in other trace elements (Ba, Sr, Rb) that indicate complex petrogenetic processes, and (2) biotite compositions are similar throughout a deposit and relatively independent of stratigraphic height or juvenile clast texture (crystal-rich vs crystal-poor). Our results show that trace elements in biotite can be used to fingerprint eruptions and correlate geographically separated volcanic deposits, including those preserved in offshore turbidite records.
  • In situ X-ray tomographic microscopy observations of vesiculation of bubble-free and bubble-bearing magmas
    Item type: Journal Article
    Pistone, Mattia; Caricchi, Luca; Fife, Julie L.; et al. (2015)
    Bulletin of Volcanology
    Magma degassing is thought to play a major role in magma fractionation, transport, storage, and volcanic eruption dynamics. However, the conditions that determine when and how magma degassing operates prior to and during an eruption remain poorly constrained. We performed experiments to explore if the initial presence of gas bubbles in magma influences the capability of gas to escape from the magma. Vesiculation of natural H2O-poor (<<1 wt.%) silicic obsidian glasses was investigated by in situ, high-temperature (above the glass transition) experiments using synchrotron-based X-ray tomographic microscopy with high spatial (3 μm/pixel) and temporal resolution (1 second per 3D dataset). As a validation, a second set of experiments was performed on identical starting materials using a Karl-Fisher titration setup to quantify the amount of extracted gas that escapes via volatile diffusion and/or bubble coalescence during vesiculation. In both sets of experiments, vesiculation was triggered by heating the samples at room pressure. Our results suggest that the presence of pre-existing gas bubbles during a nucleation event significantly decreases the tendency of bubbles to coalesce and inhibits magma outgassing. In contrast, in initially bubble-free samples, the nucleation and growth of bubbles is accompanied by significant coalescence and outgassing. We infer that volatile-undersaturated (i.e. bubble-free) magmas in the reservoirs are more likely to erupt effusively, while the presence of excess gas already at depth (i.e. bubble-bearing systems) increases the likelihood of explosive eruptions.
  • Standardized analysis of juvenile pyroclasts in comparative studies of primary magma fragmentation; 1. Overview and workflow
    Item type: Journal Article
    Ross, Pierre-Simon; Dürig, Tobias; Comida, Pier Paolo; et al. (2022)
    Bulletin of Volcanology
    Juvenile pyroclasts, especially in the ash size range, provide important information on primary fragmentation processes, i.e., initial explosive magma fragmentation, and on the state of the magma both prior to and at the point of fragmentation and quenching. There exists an extensive body of literature focusing on the quantification of juvenile particle morphology (shape), internal textures, and surface features spanning several decades; however, a standardized method has yet to emerge for comparative studies. No community-wide consensus currently exists (i) regarding the most representative size fraction(s) to be examined, (ii) on sample preparation procedures (such as whether to use whole-particle silhouettes or 2D cross-sections), (iii) on imaging techniques and image acquisition parameters, or (iv) on the optimal morphometric parameters to measure. Lack of a standardized method precludes robust comparison between different studies and laboratories. We propose here a preliminary "best practices" and workflow for characterization of juvenile pyroclasts, for comparative studies of primary fragmentation. If the community follows such a standardized method, it will become possible to accumulate a large volume of consistent data on juvenile pyroclasts from a range of eruption styles, fragmentation mechanisms, and magma compositions. This will ultimately allow deeper insights into the full panoply of magma-to-pyroclast processes that drive particle-producing volcanic eruptions. One or more "fragmentation diagrams" may eventually be developed to allow different types of magmatic and phreatomagmatic explosive eruptions to be distinguished based on their products.
  • Origin of internal flow structures in columnar-jointed basalt from Hrepphlar, Iceland I.
    Item type: Journal Article
    Bosshard, Sonja A.; Mattsson, Hannes B.; Hetényi, György (2012)
    Bulletin of Volcanology
  • Fundamental changes in the activity of the natrocarbonatite volcano Oldoinyo Lengai, Tanzania
    Item type: Journal Article
    Keller, Joerg; Klaudius, Jurgis; Kervyn, Matthieu; et al. (2010)
    Bulletin of Volcanology
Publications 1 - 10 of 31