Monogenetic volcanoes: eruption dynamics, growth, structure and physical modeling
This session invites scientific contributions about growth and distribution of monogenetic volcanoes, their internal structure, the role of substrate geology on eruption diversity and specially maar-diatremes development.
Small-scale basaltic volcanic systems are the most widespread forms of magmatism on the planet and are expressed at the Earth’s surface as fields of small volcanoes which are the landforms resulting from explosive and eﬀusive processes triggered by the rise of small batches of magma. This session is concerned with the growth, geomorphology, eruption dynamics, geodynamic distribution and degradation of this type of volcanism. Monogenetic volcanoes distribution inside a volcanic field depends in each case on their regional and local tectonic controls. The great variety of eruptive styles, edifice morphologies, and deposits shown by monogenetic volcanoes are the result of a complex combination of internal (magma composition, gas content, magma rheology, magma volume, etc.) and external (regional and local stress fields, stratigraphic and rheological contrasts of substrate rock, hydrogeology, etc.) parameters, during the magma transport from the source region to the surface. This is meant to be a multidisciplinary session and we invite contributions that include diﬀerent type of methods, such as; field studies, geophysical methods, numerical and analogue modelling of volcanic processes and GIS analysis.
Session 2. Geochemistry and petrology of monogenetic volcanism related magmas
Monogenetic volcanoes have been traditionally linked to direct magma transfer from the mantle to the surface. However, recent detailed petrological and geochemical studies of some monogenetic eruptions suggest that magmas coming from depth in dikes are not able to rise straight to the surface, but stall at some intermediate depth developing an environment in which processes such as magma mixing, crystal fractionation and/or crystal assimilation can occur. Understanding the processes and magma plumbing systems that lead to monogenetic eruptions is fundamental for better interpreting the monitoring data of the unrest episodes in monogenetic volcanic fields and thus improve the eruption forecasting in these regions. We invite contributions that include field observations, geochemical, isotopic and petrological data, analogue models of dike propagation and experimental petrology of magma ascents.
Session 3. Lakes in maar volcanoes: the sedimentary record of paleontology, climate change and hydrochemistry
The geometry of Maar-diatreme craters usually leads to develop hydrologically closed lakes that contain anoxic bottom conditions. Such settings are ideal for the preservation of complete and detailed sedimentary records of past environmental changes. These records include climate evolution, ecological reconstructions, hydrochemistry and human impact in natural systems. Exceptionally preserved fossils in such meromictic lakes are also an important source to study the history of life and its evolution.
This session wants to create synergies between volcanologists and other researchers dealing with limnology, hydrochemistry, mineralogy, paleontology, and climate proxies, among many others.
Session 4. Volcanic hazard and risk assessment in monogenetic volcanic fields
José Luis Macias
Volcanic hazards threaten the economy, transport and natural environments within and surrounding volcanic fields. Alongside scoria cones and lava flows, many volcanic fields host maar-diatreme volcanoes and tuﬀ-rings, which represent the second most common volcano type on land. These pose a specific suite of hazards, including violent lateral pyroclastic surges and eﬀicient ash production, which often poses regional hazard. The locations of their future formation are also highly uncertain in most fields. Growth of population, increasingly complex infrastructure and changing technologies of our society, make assessment and mitigation of maar-related hazards important issues. We invite all contributions to this session in areas of evaluation of monogenetic volcanic hazard, including spatio-temporal forecasting methods, dynamic hazard and impact models and the characteristic hazards associated with maar-diatreme volcanism.
Session 5. Natural resources and geotourism development in volcanic areas
Monogenetic volcanism provides the materials and landforms that scientists use to explore the volcanology and geochemistry of the Earth’s interior. In addition to these scientific and, at times, theoretical studies, monogenetic volcanism also provides numerous economic benefits. Contributions are welcomed that focus on the diverse utilization of monogenetic volcanic fields, including use of mineral, rocks and water resources, landscape preservation (and degradation), geotourism and geoparks. We would like to emphasizes whit this last point; volcanic geoparks and its complementary value, the environmental education and the sustentable entertainment related to volcanic landscapes to make a contribution to the sustainable development of the region. This session will highlight economic and social aspects of monogenetic volcanism and thus help bridge the gap between science and society.