MoMAR-D: a technological challenge to monitor the dynamics of the Lucky Strike vent ecosystem

Abstract

Colaço, A., Blandin, J., Cannat, M., Carval, T., Chavagnac, V., Connelly, D., Fabian, M., Ghiron, S., Goslin, J., Miranda, J. M., Reverdin, G., Sarrazin, J., Waldmann, C., and Sarradin, M. 2011. MoMAR-D: a technological challenge to monitor the dynamics of the Lucky Strike vent ecosystem. – ICES Journal of Marine Science, 68: 416–424. The MoMAR (monitoring the Mid-Atlantic Ridge) project was initiated in 1998 by the InterRidge programme to promote and coordinate long-term multidisciplinary monitoring of hydrothermal vents at the Mid-Atlantic Ridge (MAR). The major objective of the project is to study vent ecosystem dynamics using a multidisciplinary approach from geophysics to microbiology over a period of a few decades. MoMAR-D is a demonstration project of MoMAR, partially funded by the European network of excellence ESONET (http://www.esonet-noe.org/). MoMAR-D aims to deploy and manage a multidisciplinary observing system at the Lucky Strike vent field for 1 year. This large hydrothermal field is located at the centre of one of the most volcanically active segments of the MAR. The project has been set up to monitor this region to capture evidence of volcanic events, observe interactions between faulting, magmatism, and hydrothermal circulations, and to evaluate the potential impacts of these environmental factors on the unusual communities colonizing hydrothermal vents. The MoMAR-D infrastructure consists of two sea monitoring nodes (SEAMON) acoustically linked to a surface buoy with satellite communication to a land-based station. The first node will be mainly dedicated to geophysical studies, whereas the second will focus on ecological studies and chemical fluxes. The infrastructure should have been deployed in September 2010 during the MoMARSAT cruise.

A comparison of in situ vs. ex situ filtration methods on the assessment of dissolved and particulate metals at hydrothermal vents

“…The cruise focused on deep-sea EMSOAzores observatory maintenance (SEAMON E/W, Tempo and BOREL buoy) located within the Lucky Strike hydrothermal field, on the Mid-Atlantic Ridge (MAR) (37°17'N) (Colaço et al 2011). In the Lucky Strike field, vent sites are distributed around a lava lake at depths of between 1650 and 1750 m (Fouquet et al 1995).…”

Permeability of the Lucky Strike deep-sea hydrothermal system: Constraints from the poroelastic response to ocean tidal loading

“…The MOMAR (Monitoring the Mid-Atlantic Ridge) experiment has measured exit-fluid temperatures at 9 sites at the LSHF since 2009, along with other parameters such as bottom pressure, bottom currents, and seismicity (Ballu et al, 2009;Colaço et al, 2011;Crawford et al, 2013;Barreyre et al, 2014). For this study we use the eight best-quality, high-temperature (T > 200 • C) exit- Barreyre et al, 2014) to estimate the phase lag, ϕ T , between discharge temperature and bottom pressure at tidal periods.…”

“…b Calculated for pressure at 200 bar and hydrothermal fluid temperature at 330 • C from Holzbecher (1998), Rabinowicz et al (1999), Fontaine et al (2001). c Crawford et al (2013). d Arnulf et al (2011).…”

“…Because a considerable amount of seismic work has been done at the LSHF we have well-constrained estimates for both the magma chamber depth (∼3400 mbsf) and the extrusive layer thickness (∼600 mbsf) (Singh et al, 2006;Seher et al, 2010;Arnulf et al, 2011;Crawford et al, 2013). We use these depths when considering each of these scenarios, in turn.…”

Prokaryote Communities at Active Chimney andIn SituColonization Devices After a Magmatic Degassing Event (37°N MAR, EMSO‐Azores Deep‐Sea Observatory)

“…Since its discovery in 1992, LSHF has been well characterized with respect to fluid chemistry (Charlou et al, 2000;Chavagnac, Saleban, et al, 2018;Langmuir et al, 1997;Pester et al, 2012;Von Damm et al, 1998), geological settings (Barreyre et al, 2012;Escartín et al, 2008;Escartín et al, 2015;Fouquet et al, 1994;Humphris et al, 2002;Ondréas et al, 2009;Singh et al, 2006), macrobiological, and microbiological communities (Crépeau et al, 2011;Cuvelier et al, 2009;De Busserolles et al, 2009;Desbruyères et al, 2001;Flores et al, 2011;Lee Van Dover et al, 1996;. The second node deployed at the base of Eiffel Tower active site is dedicated to ecological survey with an in situ iron analyzer (CHEMINI Fe), an optode oxygen sensor, a turbidity sensor, and a HD video camera (SMOOVE; Colaço et al, 2011;Sarradin, Blandin, Escartin, Cannat, et al, 2010). EMSO-Azores is a noncabled multidisciplinary observatory built around two sea monitoring nodes (SEAMON), and a BOREL buoy for satellite data transmission.…”