Methane is one of the most important greenhouse gasses with ever-rising atmospheric concentrations. While anthropogenic sources are comparably well understood, it is still a major scientific challenge to understand and quantify the contribution of natural sources. One reason for this knowledge gap is that (bio)geochemical and geological controls on methane dynamics in aquatic and terrestrial systems as well as the spatial distribution of methane in marine and aquatic sediments, soils and permafrost areas is not well constrained.
The topics of the session will include:
- methane formation (biological and geological processes)
- subsurface fluid flow and methane/hydrocarbon transport mechanisms
- ‘marine’ methane-rich systems: e.g. gas hydrates, shallow gas, cold seep-related systems
- ‘terrestrial’ methane-rich systems: e.g. wet lands (natural & artificial), lakes (from puddles to inland seas), permafrost areas and rivers
- methane-associated (bio)geochemical reactions, microbial communities and food web structures
- methane-derived carbonates and microbe-mineral interactions
- monitoring of methane emission
- methane in paleo environments
- methane and as a new alternative energy sourcse

We aim at gathering scientists from the fields of geology, (bio/geo)chemistry, (geo)physics, modeling, (micro)biology and ecology, to evaluate our current knowledge of aquatic and terrestrial methane dynamics, interactions between element cycles and ecosystems, environmental controls and mechanisms.

This session welcomes contributions from geophysical, geochemical, microbial, numerical, and laboratory studies to promote a better understanding of geological processes and Life in modern and fossil extreme environments, with a special emphasis on mud volcanoes and hydrothermal systems. We encourage multidisciplinary studies related to environments that promoted Life emergence on the Hadean Earth both in past and present extreme terrestrial environments including planetary analogues. We welcome discussion about new approaches to detect and characterise Life in such conditions ranging from biology to geophysics. This also includes geochemical, geological and multidisciplinary datasets investigating piercement structures and their geochemical reactions occurring at depth and at the surface as well as microbiological studies. The session will also discuss the effects of extreme environments on palaeo-climate and how external forcing may affect such systems.

Public information:
Dear Authors,

in order to facilitate the exchange of information during the chat session, we have divided the contributions by topics and accordingly we proposed an attendance time (see below). We wish you all a productive EGU conference.

BG5.3 convenors
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Attendance time: Tuesday, 05 May 08:30–10:15

D796 |
EGU2020-3344
| Highlight
The effects of climate change on the Atacama Desert as a pertinent Mars analog model
Armando Azua-Bustos and Alberto G. Fairén

D797 |
EGU2020-12720
A characterization of microbial diversity in the Winter Wonderland Ice Cave, Uinta Mountains, Utah, USA
Miranda Seixas, Erin Eggleston, Jeffrey Munroe, and David Herron

D798 |
EGU2020-12203
Linking decay of microbial mats and dolomite formation in the sabkhas of Qatar
Zach Diloreto, Maria Dittrich, Tomaso Bontognali, Hamad Al Saad Al Kuwari, and Judith A. McKenzie

D799 |
EGU2020-1581
The waterbodies of the Dallol volcano: A physico-chemical and geo-microbial survey
Hugo Moors, Miroslav Honty, Carla Smolders, Ann Provoost, Mieke De Craen, and Natalie Leys

D813 |
EGU2020-3003
Detecting microbial pigments from gypsum using Raman spectroscopy: from field prospection to laboratory studies
Jan Jehlicka, Kateřina Němečková, and Adam Culka

D814 |
EGU2020-12335
The characteristics of microbial communities along the littoral gradient of a proglacial lake in Qinghai-Tibet Plateau
Meiqing Lu, Xin Luo, Jiu Jimmy Jiao, Hailong li, Xingxing Kuang, Rong Mao, Xiaoyan Shi, and Yuqing Feng

D815 |
EGU2020-667
The ferruginous, sulfate-rich hypolimnion of a post-mining lake as an analogue to disentangle redox cycling in Paleoproterozoic coastal zones
Daniel Petráš, Christophe Thomazo, and Stefan Lalonde

D816 |
EGU2020-20279
Detection of sulphuric life in Mars analogue material using a miniature LIMS system
Andreas Riedo, Valentine Grimaudo, Joost W. Aerts, Alena Cedeño López, Marek Tulej, Pascale Ehrenfreund, and Peter Wurz


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Attendance time: Tuesday, 05 May 10:45–12:30


D800 |
EGU2020-15205
New insights into the magmatic system southeast of El Hierro from high-resolution 2D seismic data
Kai-Frederik Lenz, Felix Gross, Andreas Klügel, Rachel Barrett, Philipp Held, Katja Lindhorst, Paul Wintersteller, and Sebastian Krastel

D801 |
EGU2020-3673
| Highlight
Earthquake triggering of mud volcanoes and fluid seepage systems in fold-and-thrust belts and subduction zones
Marco Bonini and Daniele Maestrelli

D802 |
EGU2020-1271
Peculiarities of mud volcanism in Lake Baikal
Grigorii Akhmanov, Adriano Mazzini, Oleg Khlystov, Alina Kudaeva, and Olesia Vidishcheva

D803 |
EGU2020-16565
Different pockmark systems and their potential importance for the hydrological and biogeochemical balance of a peri-alpine lake
Adeline N.Y. Cojean, Maciej Bartosiewicz, Jeremy Zimmermann, Moritz F. Lehmann, Katrina Kremer, and Stefanie B. Wirth

D804 |
EGU2020-4840
Internal Structure of Venere Mud Volcano in the Crotone Forearc Basin, Calabrian Arc, Italy, from Multibeam Bathymetry, Wide-Angle and Multichannel Seismic Data
Michael Riedel, Anne Krabbenhoeft, Cord Papenberg, Joerg Bialas, Gerhard Bohrmann, and Silvia Ceramicola

D805 |
EGU2020-3664
Tectonic structures vs genesis and activity of mud volcanoes: examples from Emilia and Marche (Northern Apennines, Italy)
Marco Bonini, Daniele Maestrelli, and Federico Sani

D806 |
EGU2020-1336
A shallow mud volcano in the sedimentary basin off the Island of Elba
Alessandra Sciarra, Anna Saroni, Fausto Grassa, Roberta Ivaldi, Maurizio Demarte, Christian Lott, Miriam Weber, Andi Eich, Ettore Cimenti, Francesco Mazzarini, and Massimo Coltorti

D807 |
EGU2020-1315
Explosive mud volcano eruptions and rafting of mud breccia blocks
Adriano Mazzini, Grigorii Akhmanov, Manga Michael, Alessandra Sciarra, Ayten Khasayeva, and Ibrahim Guliyev

D808 |
EGU2020-5213
Palynology of Holocene Lake Baikal sediments
Alienor Labes, Adriano Mazzini, Grigorii G. Akhmanov, and Wolfram M. Kürschner

D809 |
EGU2020-20934
Integrated analysis of geophysical and geochemical data from cold fluid seepage system along the Gydratny Fault (Lake Baikal)
Olesya Vidischeva, Marina Solovyeva, Evgeniya Egoshina, Yana Vasilevskaya, Elena Poludetkina, Grigorii Akhmanov, Oleg Khlystov, and Adriano Mazzini

D810 |
EGU2020-1741
Geochemistry of oil-and-gas seepage in Lake Baikal: towards understanding fluid migration system
Evgeniya Egoshina, Michail Delengov, Olesya Vidishcheva, Elena Bakay, Natalya Fadeeva, Grigorii Akhmanov, Adriano Mazzini, and Oleg Khlystov

D811 |
EGU2020-4413
Concentrations and behavior of rare earth elements in mud volcanic waters
Alexey Sobisevich, Valery Ershov, Evgeniy Elovskiy, Elnur Baloglanov, and Irina Puzich

D812 |
EGU2020-3307
Borate accumulations related to onshore mud volcanism: Case study from the Kerch Peninsula, the Caucasus collision zone
Ellina Sokol, Svetlana Kokh, Olga Kozmenko, and Vasili Lavrushin