Transcript Lucky Strike - Institut de Physique du Globe de Paris

Implementation of an observatory strategy
in the Lucky Strike vent field
The MOMAR (“Monitoring the Mid-Atlantic Ridge”) project has been
developed to promote a coordinated and multidisciplinary long-term
study of hydrothermal environments at the Mid-Atlantic Ridge (MAR)
near the Azores (35°N to 40°N).
Javier Escartin*, Pierre Marie Sarradin**, Céline Rommevaux-Jestin* & Mathilde Cannat*
* Institut de
Physique du
Globe Paris
** Ifremer
Brest
Hydrothermal circulation at mid-ocean ridges is a fundamental
process that controls the transfer of energy and matter from the
interior of the Earth to the crust, hydrosphere and biosphere.
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Humphris and McCollum, Oceanus, 41 (2),
1998
Ridge spreading rate & Hydrothermal Circulation:
Fast
vs.
Slo
w
?
?
The MOMAR project: a contribution to understanding the causal links
among magmatic, tectonic, hydrothermal, biochemical and biological
processes at slow spreading ridge environments
The MOMAR Area
• Slow-spreading Mid-Atlantic Ridge (12 mm/yr half-rate)
• In proximity to the Azores
• 36°to39°N - consists of several ridge segments: good targets for establishing
integrated studies at regional scale, segment scale, and individual vent sites
MOMAR hydrothermal sites:
4 known sites, 3 hydrothermal environments
- Peridotite hosted, high T, end of segment at discontinuity - Rainbow
- Peridotite hosted, diffuse low T, end of segment - Saldanha
- Basalt-hosted, high T, center of segment - Menez Gwen and
Lucky Strike
MOMAR hydrothermal sites:
4 known sites, 3 hydrothermal environments
- Peridotite hosted, high T, end of segment at discontinuity - Rainbow
- Peridotite hosted, diffuse low T, end of segment - Saldanha
- Basalt-hosted, high T, center of segment - Menez Gwen and Lucky
Strike
Lucky Strike : a large hydrothermal vent field (2km/1km) at
summit of rifted central volcanoe
Lucky Strike
Lucky Strike is the
selected MOMAR site for
integrated & multiscale
long-term monitoring of
ridge hydrothermal
processes and
ecosystems
Lucky
Strike
Lucky Strike : a large hydrothermal vent field (2km/1km) at
summit of rifted central volcanoe
Lucky Strike
More than 40 identified
high-T & low-T vents ….
A remarkable diversity of
species….
A Marine Protected Area
in the portuguese ZEE.
Vent ecosystem dynamics in the
MOMAR
area
Dispersal
Propagule
input
Hydrothermal
Ecosystem
Hydrothermal
Fluxes
Biological
Interactions
Magmatic
Tectonic
Events
Photosynthetic
seasonal
input
microbiology
Lucky Strike observatory design I
2006-2009
Light ASSEM
buoy design
Time series sampling
Long term chemical
monitoring
EM monitoring
II
2009-
AUV for rapid response
Long term visual monitoring
EM monitoring
Lucky Strike end of site survey phase
2005-2006
Seafloor mapping and imaging
Volcanoe scale on bottom gravity survey
Segment scale seismic reflection & refraction cruise
Upcoming Cruises:
EXOMAR (2005, Godfroy): Bio/ecological studies of MOMAR sites
SISMOMAR (2005, W. Crawford): 3D seismic structure of the LS
segment and central volcano:
Porosity of the segment and central volcano
Presence of fluids and heat sources
Velocity structure for microseismicity studies
GRAVILUCK (2005/2006, V. Ballu): Geodesy and seafloor gravity.
Observatory design phase I (Long-term monitoring of seafloor
vertical deformation and gravity)
MOMARETO (2006, Sarradin):
Ecosystem studies. Observatory design phase I (Visual and chemical
monitoring of vent habitats).
Further implementation of Phase I and Phase II observatory design:
MoMAR is an international, InterRidge sponsored program with
european leadership. MoMAR holds frequent workshops (last to date
in Lisbon, april 2005).
It is supported by national funding agencies and marine institutes in
France, the US, Portugal, the UK, with active involvment of individual
scientists in other european countries.
It benefits from EC support through the STREP and MCRTN
schemes. It is a component of the ESONET “european seafloor
observatory network”.
MoMAR welcomes participation of interested scientists and
engineers. For more information & contacts : www.momar.org