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EUG 10 Special Sessions

InterRidge Office mac at ext.jussieu.fr
Wed Oct 21 17:01:00 EST 1998

EUG 10 Meeting       28 March - 1 April 1999, Strasbourg, France
Abstract Deadline: 15 November, 1998
Abstract submission:
                Special sessions relevant to mid-ocean ridge research

 B13: Methane hydrates and the deep sub-seafloor biosphere
 C5: The deep biosphere
 F2: Magmatic, tectonic and hydrothermal processes at mid-ocean
        ridges and back-arc basins
  Symposium B13: Methane hydrates and the deep sub-seafloor biosphere

 Convenors:  Judith A. McKenzie (Zürich) sediment at erdw.ethz.ch and B.U.
Haq (Arlington) 

The recent resurgence of interest in methane hydrates has resulted from
recognition that they may play important roles in the global carbon
and rapid climate change through emissions of methane from marine
and permafrost into the atmosphere, and in causing mass failure of
and structural changes on the continental slope. A deep microbial source
the methane links the formation of hydrates with an actively
deep sub-seafloor biosphere, which has been recognised during ODP
Methane seeps are also associated with diverse biota in the deep ocean,
unlike the assemblage associated with hydrothermal vents. The methane
hydrate role in modulating climate and slope-stability, as well as the
related biological activity in the sub-surface and on the seafloor, will

Symposium C5: The deep biosphere

 Convenors: Nils Holm (Stockholm) nilsholm at geo.su.se and J. Parkes

The rapid growth of interest in the existence of a microbial life in the
seafloor and continental subsurface has created needs for information
synthesis to guide the development of research strategies and programs.
existence of a deep biosphere amounted to speculation only a few years
Whatever their origin, bacteria in the deep biosphere are uniquely
to survive in exceedingly harsh environments. This knowledge, in
with other recent research into the role that bacteria play in global
biogeochemistry, is beginning to influence ideas about nutrient cycling,
dolomite formation, biomineralization, biological adaptation and the
size of
the biosphere beneath the surface of the lithosphere.

Symposium F2: Magmatic, tectonic and hydrothermal processes at mid-ocean
ridges and back-arc basins

 Convenors: Cara Wilson (Paris) intridge at ext.jussieu.fr, J. Dyment
and R.-B. Pedersen (Bergen) 

Mid-ocean ridges are commonly divided into "fast" and "slow" spreading
centres. However, recent studies from the Southwest Indian and Arctic
ridges, from portions of the Mid-Atlantic Ridge that are near hot spots,
from the intermediate spreading Southeast Indian Ridge, and from various
spreading centres in back-arc basins, emphasise the potential effects of
ultra-slow spreading rates, of variations in mantle temperature, and of
complexities in plate kinematics, on mantle melting and on axial
tectonic and hydrothermal processes. We seek contributions addressing
variability of these processes, and discussing the nature of the
physical parameters, in different spreading environments.This session is
sponsered by InterRidge.

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