Distribution of rootless cones and landforms resulting from water-lava interactions at hagi in the Aðaldalur valley (Iceland)

International audience The region of Lake Mývatn and the Aðaldalur Valley in Iceland is known for its high concentration of rootless cones. To study the processes involved in the formation of those volcanic landforms, a 1.1 km² study area rich in volcanic landforms was delineated near the Hagi guest...

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Bibliographic Details
Main Authors: Bourrier, Émeline, Mathieu, Gaëlle, Leyrit, Hervé, Le Bivic, Réjanne, Ottavi-Pupier, Elsa, Denis, Maxime, Duquennoy, Julien, Dujanny, Arnaud
Other Authors: UniLaSalle, Jean-Yves Reynaud, Eric Armynot du Châtelet
Format: Book Part
Language:English
Published: CCSD 2025
Subjects:
Hydrovolcanism
Iceland
Mývatn
Laxa lava
rootless cones
[SDU]Sciences of the Universe [physics]
Aðaldalur
Laxa
Online Access:https://hal.science/hal-05005185
https://hal.science/hal-05005185v1/document
https://hal.science/hal-05005185v1/file/BOURRIER_et_al_ASF_2025.pdf
https://doi.org/10.70665/WDLH3582
Description
Summary:International audience The region of Lake Mývatn and the Aðaldalur Valley in Iceland is known for its high concentration of rootless cones. To study the processes involved in the formation of those volcanic landforms, a 1.1 km² study area rich in volcanic landforms was delineated near the Hagi guesthouse in the Aðaldalur valley. The rootless cones and other facies were referenced, and a high resolution orthomosaic and 3D model were produced using drone acquisition. A new classification of rootless volcanic cones and mounds was produced, as well as an architecture of the Hagi zone. This area is interpreted as a continuous transition of explosive interactions between lava and water saturated sediments followed by a basaltic flow due to depletion of water. The lava flow mechanically erodes some of the rootless cones.

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