Title :

Surface structure, activity and microgravimetry modeling delineate contrasted mud chamber types below flat and conical mud volcanoes from Azerbaijan

Author(s) :

Odonne, Francis [Auteur]
Géosciences Environnement Toulouse [GET]
Imbert, Patrice [Auteur]
Laboratoire des Fluides Complexes et leurs Réservoirs [LFCR]
Remy, Dominique [Auteur]
Géosciences Environnement Toulouse [GET]
Gabalda, Germinal [Auteur]
Géosciences Environnement Toulouse [GET]
Aliyev, Adil [Auteur]
Azerbaijan National Academy of Sciences [ANAS]
Abbasov, Orhan [Auteur]
Azerbaijan National Academy of Sciences [ANAS]
Baloglanov, Elnur [Auteur]
Azerbaijan National Academy of Sciences [ANAS]
Bichaud, Victoria [Auteur]
Géosciences Environnement Toulouse [GET]
Juste, Remy [Auteur]
Géosciences Environnement Toulouse [GET]
Dupuis, Matthieu [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Bonvalot, Sylvain [Auteur]
Géosciences Environnement Toulouse [GET]

Journal title :

Marine and Petroleum Geology

Pages :

105315 [24 p.]

Publisher :

Elsevier

Publication date :

2021-12

ISSN :

0264-8172

HAL domain(s) :

Planète et Univers [physics]

English abstract : [en]

We compared the structure of two flat and two conical mud volcanoes (MV) in Azerbaijan in order to understand what governs the morphological contrast. We paid particular attention to the structural evolution of the surface, ...
Show more >We compared the structure of two flat and two conical mud volcanoes (MV) in Azerbaijan in order to understand what governs the morphological contrast. We paid particular attention to the structural evolution of the surface, as observed in the field over 5 years and as monitored by satellite images revealing surface activity over that period; in addition, we acquired microgravity measurements to probe deeper structure. The combination of these data reveals in all studied volcanoes significant mass deficit concentric with the surface edifice. Modeling indicates that the mass deficit is consistent with a chamber underlying the summit caldera of conical MVs and the plateau of flat MVs, with a thickness of several hundred meters for a density contrast of 500 kg/m3 between the chamber mud and the surrounding solid mud. Surface structures and their evolution during and in between eruptions provide insight into the depth of the mud chamber, which lies within a few meters of the surface for flat mud volcanoes and one to several hundred meters deep for conical ones. Surface structures and satellite-derived deformation analysis shows that flat mud volcanoes grow by radial expansion and compression of the flanks distributed all around the edifice. In contrast, conical mud volcanoes grow by flow stacking in the summit caldera, deformation being constrained by the caldera rim; excess mud supply is accommodated by occasional rim breaching and mud overflow into flank gullies.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Comment :

We would like to thank TOTAL who provided financial support to this research. We are also grateful to the Institute of Geology and Geophysics of Azerbaijan, National Academy of Sciences for substantial help during field work. We wish to express our warmest thanks to Rassim Akhundov and all the staff of Total E&P Absheron B.V. who kindly provided technical assistance during field missions. We thank CNRS INSU and RESIF-Gmob who graciously lent us a gravimeter for the 2018 and 2019 field work.

Collections :

• Laboratoire d'Océanologie et de Géosciences (LOG) - UMR 8187

Source :

Harvested from HAL