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5th International Maar Conference: Environmental studies of Maar lakes and other volcanic lakes
From: Chako Tchamabe Boris <boris.chako@xxxxxxxx>5th International Maar Conference: Environmental studies of Maar lakes and other volcanic lakes
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Dear Colleagues,
HAPPY NEW YEAR 2014.
We are convening the following session at the 5th INTERNATIONAL MAAR CONFERENCE that will be held in MEXICO from 17-21 Nov 2014.
We therefore invite your contributions on subjects from the limnological study, the effect of micro-organism on volcanic lakes behavior, as well as the role of lakes in understanding the Paleoclimate.
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Details on the conference are availavle on : http://maar2014.geociencias.unam.mx/
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Our session
Session 2 : Environmental studies of Maar lakes and other volcanic lakes: Biology, Ecology, Limnology, Paleoclimate and Lake Sedimentation
Conveners:
Boris Chako Tchamabé (boris.chako@xxxxxxxxx)
Georg Büchel (Georg.Buechel@xxxxxxxxxxx)
Joerg Negendank (neg@xxxxxxxxxxxxxx)
Javier Alcocer (jalcocer@xxxxxxx)
Beatriz Ortega (bortega@xxxxxxxxxxxxxxxxx)
Károly Németh (K.Nemeth@xxxxxxxxxxxx)
Takeshi Ohba
Abstract
Volcanic lakes occupy generally craters formed by hydrothermal, hydrovolcanic, or magmatic eruptions and are rarely found in valleys blocked by lava flows. Most of these lakes lie in maar structures, which are created by explosive eruptions through phreatomagmatic fragmentation of magma that occur when rising magma interact with groundwater. Depending on the depth of magma-water interaction, the explosion will cut the country rocks to make a deep or shallow crater, which could be either dry or water-filled depending on the level of general groundwater table. The ensuing lakes represent one of the most exceptionally attractive touristic sites among natural crater lakes because of their nice shapes, their beautiful water colours, and the well-exposed and contrasting aspect of their deposits. However, whilst they are generally quiescent-like, they are rather a laboratory of diverse biological and chemical activities. On the other hand, maar-lakes are generally the receptacle of
sediments derived from drained particles and also from dispersed volcanic ash produced during regional volcanic activities. Furthermore, while the sedimentation rate is closely dependent to the hydrological system of the lake, the chemical compositions of these lakes are shown to be influenced by the climate, the hydrology and hydrogeology, the microorganisms, and internal parameters that are mainly represented by the hydrothermal system beneath them.
In this session, we seek to collect papers that:
Evaluate the relationship between volcanic lakes in general and their proxy-environment based long/short term monitoring and/or preliminary investigations of the physico-chemical, biological, isotopic and geochemical compositional evolutions;
Address the concern of the role of the magmatic system in the temporal variation of volcanic gas species in lakes, in order to understand volcanic hazards related to maars.
Because maar-lakes are particularly important as they are ideal traps archiving the environmental history in their sediments often on an annual to decadal resolution comparable to ice-cores; also, because absolute dating beyond the range of radiocarbon (> 50 ka) is problematic and that age estimates for records of the last Interglacial rely on indirect dating approaches by, e.g., tuning to the timescale of orbital variations or “wiggle-matching“ to another record and applying its chronology (marine records), annually resolved Maar lake records might allow the establishment of Varve-chronology, Calibration of 14C up to 50 ka, tephrochronology, magnetostratigraphy, reconstruction of paleoclimate and paleoenvironment by using multiproxies.We look also to collect papers dealing with such investigations and especially those focusing on continental paleoclimatology.
_______________________________________________________________________________________________
All the best !
Kind Regards.
--
Chako Tchamabe Boris (PhD student)
Laboratory of Geochemistry &Volcanology, TOKAI University, 4-1-1 Kitakaname, Hiratsuka, Kanagawa 259-1292 JAPAN
Department of Earth Science, University of Douala, PO Box: 24 157 Douala-CAMEROON
Email: boris.chako@xxxxxxxx / boris.chako@xxxxxxxxx
Tel: 8048721984
IAVCEI-VHUB :https://vhub.org/members/2257/groups
RG : http://www.researchgate.net/profile/CHAKO_TCHAMABE_Boris/
Details on the conference are availavle on : http://maar2014.geociencias.unam.mx/
--------------------------------------------------------------------------------------------------------------------------------------------------------
Our session
Session 2 : Environmental studies of Maar lakes and other volcanic lakes: Biology, Ecology, Limnology, Paleoclimate and Lake Sedimentation
Conveners:
Boris Chako Tchamabé (boris.chako@xxxxxxxxx)
Georg Büchel (Georg.Buechel@xxxxxxxxxxx)
Joerg Negendank (neg@xxxxxxxxxxxxxx)
Javier Alcocer (jalcocer@xxxxxxx)
Beatriz Ortega (bortega@xxxxxxxxxxxxxxxxx)
Károly Németh (K.Nemeth@xxxxxxxxxxxx)
Takeshi Ohba
Abstract
Volcanic lakes occupy generally craters formed by hydrothermal, hydrovolcanic, or magmatic eruptions and are rarely found in valleys blocked by lava flows. Most of these lakes lie in maar structures, which are created by explosive eruptions through phreatomagmatic fragmentation of magma that occur when rising magma interact with groundwater. Depending on the depth of magma-water interaction, the explosion will cut the country rocks to make a deep or shallow crater, which could be either dry or water-filled depending on the level of general groundwater table. The ensuing lakes represent one of the most exceptionally attractive touristic sites among natural crater lakes because of their nice shapes, their beautiful water colours, and the well-exposed and contrasting aspect of their deposits. However, whilst they are generally quiescent-like, they are rather a laboratory of diverse biological and chemical activities. On the other hand, maar-lakes are generally the receptacle of
sediments derived from drained particles and also from dispersed volcanic ash produced during regional volcanic activities. Furthermore, while the sedimentation rate is closely dependent to the hydrological system of the lake, the chemical compositions of these lakes are shown to be influenced by the climate, the hydrology and hydrogeology, the microorganisms, and internal parameters that are mainly represented by the hydrothermal system beneath them.
In this session, we seek to collect papers that:
Evaluate the relationship between volcanic lakes in general and their proxy-environment based long/short term monitoring and/or preliminary investigations of the physico-chemical, biological, isotopic and geochemical compositional evolutions;
Address the concern of the role of the magmatic system in the temporal variation of volcanic gas species in lakes, in order to understand volcanic hazards related to maars.
Because maar-lakes are particularly important as they are ideal traps archiving the environmental history in their sediments often on an annual to decadal resolution comparable to ice-cores; also, because absolute dating beyond the range of radiocarbon (> 50 ka) is problematic and that age estimates for records of the last Interglacial rely on indirect dating approaches by, e.g., tuning to the timescale of orbital variations or “wiggle-matching“ to another record and applying its chronology (marine records), annually resolved Maar lake records might allow the establishment of Varve-chronology, Calibration of 14C up to 50 ka, tephrochronology, magnetostratigraphy, reconstruction of paleoclimate and paleoenvironment by using multiproxies.We look also to collect papers dealing with such investigations and especially those focusing on continental paleoclimatology.
_______________________________________________________________________________________________
All the best !
Kind Regards.
--
Chako Tchamabe Boris (PhD student)
Laboratory of Geochemistry &Volcanology, TOKAI University, 4-1-1 Kitakaname, Hiratsuka, Kanagawa 259-1292 JAPAN
Department of Earth Science, University of Douala, PO Box: 24 157 Douala-CAMEROON
Email: boris.chako@xxxxxxxx / boris.chako@xxxxxxxxx
Tel: 8048721984
IAVCEI-VHUB :https://vhub.org/members/2257/groups
RG : http://www.researchgate.net/profile/CHAKO_TCHAMABE_Boris/
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