Highly explosive eruption of the monogenetic 8.6 ka BP La Vache et Lassolas scoria cone complex (Chaîne des Puys, France)

Jordan, Simone Christiane; Pennec, L. Le; Gurioli, Lucia; Roche, Olivier; Boivin, Pierre

doi:10.1016/j.jvolgeores.2015.12.006

Cited by 19 publications

(8 citation statements)

References 51 publications

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“…In contrast, the accumulation of bombs and lapilli produced by ballistic activity leads to sheet‐like deposits on flat to low‐angle topographies (e.g., Stromboli, Italy, [ Gurioli et al ., ]; 1992 eruptions of Crater Peak, Alaska, which accumulated dispersed blocks and bombs over a flat area around the vent [ Miller et al . ]), or construct scoria cones (e.g., the 1943–1952 eruption of Paricutin, Mexico [ Pioli et al ., ]; the 8.6 BP eruptions of La Vache et Lassolas, Chaîne des Puys [ Jordan et al ., ]). Examples at Stromboli volcano (1930 paroxysm, and to a lesser extent during the 2003 and 2007 activity) also show that remobilization of large amounts of tephra accumulated on steep slopes may produce PDCs [ Rosi et al ., ; Pistolesi et al ., ; Di Roberto et al .…”

Section: Discussionmentioning

confidence: 99%

“…In this context, the study of preserved agglutinate deposits generated by ballistic activity may bring valuable insights into the early generation mechanisms of PDCs, i.e., before synemplacement fragmentation and abrasion processes. In contrast, the accumulation of bombs and lapilli produced by ballistic activity leads to sheet-like deposits on flat to low-angle topographies (e.g., Stromboli, Italy, [Gurioli et al, 2013]; 1992 eruptions of Crater Peak, Alaska, which accumulated dispersed blocks and bombs over a flat area around the vent [Miller et al 1995]), or construct scoria cones (e.g., the 1943-1952 eruption of Paricutin, Mexico [Pioli et al, 2008]; the 8.6 BP eruptions of La Vache et Lassolas, Chaîne des Puys [Jordan et al, 2016]). Examples at Stromboli volcano (1930 paroxysm, and to a lesser extent during the 2003 and 2007 activity) also show that remobilization of large amounts of tephra accumulated on steep slopes may produce PDCs [Rosi et al, 2006;Pistolesi et al, 2011;Di Roberto et al 2014], highlighting the important role of deposit thickness in ballistic-and slope-induced PDCs.…”

Section: The Role Of Topography On Mass Partitioningmentioning

confidence: 99%

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Mass budget partitioning during explosive eruptions: insights from the 2006 paroxysm of Tungurahua volcano, Ecuador

Bernard

Eychenne

Pennec

et al. 2016

Geochem Geophys Geosyst

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International audienceHow and how much the mass of juvenile magma is split between vent-derived tephra, PDC deposits and lavas (i.e., mass partition) is related to eruption dynamics and style. Estimating such mass partitioning budgets may reveal important for hazard evaluation purposes. We calculated the volume of each product emplaced during the August 2006 paroxysmal eruption of Tungurahua volcano (Ecuador) and converted it into masses using high-resolution grainsize, componentry and density data. This data set is one of the first complete descriptions of mass partitioning associated with a VEI 3 andesitic event. The scoria fall deposit, near-vent agglutinate and lava flow include 28, 16 and 12 wt. % of the erupted juvenile mass, respectively. Much (44 wt. %) of the juvenile material fed Pyroclastic Density Currents (i.e., dense flows, dilute surges and co-PDC plumes), highlighting that tephra fall deposits do not depict adequately the size and fragmentation processes of moderate PDC-forming event. The main parameters controlling the mass partitioning are the type of magmatic fragmentation, conditions of magma ascent, and crater area topography. Comparisons of our data set with other PDC-forming eruptions of different style and magma composition suggest that moderate andesitic eruptions are more prone to produce PDCs, in proportions, than any other eruption type. This finding may be explained by the relatively low magmatic fragmentation efficiency of moderate andesitic eruptions. These mass partitioning data reveal important trends that may be critical for hazard assessment, notably at frequently active andesitic edifices

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Section: Discussionmentioning

confidence: 99%

Section: The Role Of Topography On Mass Partitioningmentioning

confidence: 99%

Mass budget partitioning during explosive eruptions: insights from the 2006 paroxysm of Tungurahua volcano, Ecuador

Bernard

Eychenne

Pennec

et al. 2016

Geochem Geophys Geosyst

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“…We performed grain size analyses on the two bulk samples collected from the MV, following the procedure of Jordan et al (2016) (Table S2). The samples were dried in the oven at 90 • C and sieved at 1/2 phi intervals in the range of −5φ to 4φ (Fig.…”

Section: Grain Size and Componentrymentioning

confidence: 99%

Response to Amanda Lindoo

Gurioli¹

2017

Preprint

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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“…Since the year 2000, 61 % of known eruptions of VEI (Volcano Explosivity Index) 3 or greater have involved both effusive and explosive activity [Cassidy et al 2018]. Simultaneous tephra emission and lava effusion is also a characteristic of many cinder cone eruptions [Krauskopf 1948;Luhr et al 1993;Pioli et al 2008;Kiyosugi et al 2013;Jordan et al 2016;Smith and Németh 2017]. The dichotomy of eruptive styles poses a variety of non-trivial problems for real-time hazard assessment and thus the causes of this behavior and methods for detecting it merit further study and analysis.…”

Section: Introductionmentioning

confidence: 99%

Simultaneous effusive and explosive cinder cone eruptions at Veniaminof Volcano, Alaska

Waythomas

2021

Volcanica

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Historical eruptions of Veniaminof Volcano, Alaska have all occurred at a 300-m-high cinder cone within the icefilled caldera that characterizes the volcano. At least six of nineteen historical eruptions involved simultaneous explosive and effusive activity from separate vents. Eruptions in 1944, 1983–1984, 1993–1994, 2013, 2018 and 2021 included periods of explosive ash-producing Strombolian activity from summit vents and simultaneous nonexplosive effusion of lava from flank vents on either the southern or northeast sides of the cone. A T-junction conduit network is proposed to explain the simultaneous eruptive styles and as a mechanism for gas-magma segregation that must occur to produce the observed activity. Historical eruptions with simultaneous summit and flank activity produced slightly higher rising ash clouds compared to historical eruptions where simultaneous activity did not occur. This could be a consequence of the partitioning of more gas-charged magma into the vertical conduit of a T-junction conduit system.

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Highly explosive eruption of the monogenetic 8.6 ka BP La Vache et Lassolas scoria cone complex (Chaîne des Puys, France)

Cited by 19 publications

References 51 publications

Mass budget partitioning during explosive eruptions: insights from the 2006 paroxysm of Tungurahua volcano, Ecuador

Mass budget partitioning during explosive eruptions: insights from the 2006 paroxysm of Tungurahua volcano, Ecuador

Response to Amanda Lindoo

Simultaneous effusive and explosive cinder cone eruptions at Veniaminof Volcano, Alaska

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