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M190 with RV Meteor to the Atlantic Ocean
08.06. \u2013 10.07.2023<\/p>\n\n\n\n
Find a Blog (in German) from Prof. Harald Strau\u00df here: <\/strong><\/p>\n\n\n\n https:\/\/strauss2023.uni-muenster.blog\/<\/a><\/p>\n\n\n\n Participating institutions:<\/strong><\/p>\n\n\n\n Project description:<\/strong><\/p>\n\n\n The major aims of cruise M190 with the research vessel Meteor were to coordinate the sampling of their fluids, rocks, and biota, as part of the joint geo-bio interface studies in the Research Area \u2018Ocean Floor as a Reactor\u2019 of the MARUM Cluster of Excellence “The Ocean Floor \u2013 Earth\u2019s Uncharted Interface” (https:\/\/www.marum.de\/Ozeanboden.html<\/a>). The hydrothermal vents at the Mid-Atlantic Ridge (MAR) between 29\u00b010\u2019N and 37\u00b050\u2019N occur in different geological settings (axial volcano vs. detachment fault vs. axial volcanic ridge) and are therefore geochemically highly diverse. To understand the high diversity of these systems we tried to sample the fluids which are dispersing from the chimney structures for chemistry, the rocks to understand the geology of these systems and bacterial mats and mussels with an ROV (Remotely Operated Vehicle). Apart from sampling hot fluids with the ROV, we sampled the non-buoyant plume which is dispersing from the hydrothermal vent systems and can spread over several kilometres in the water column with a CTD (Conductivity, Temperature, Depth) water sampler. The team from the Constructor University focussed on the dissolved trace metal chemistry from the vent structures, the rising plume and the non-buoyant plume to show how metals transform between different size fractions (0.8 \u00b5m and 0.2\u00b5m) and what kind of metal-organic complexes along the mixing gradient between vent fluid and ambient seawater. This information is important for estimating the hydrothermal flux of trace metals into the ocean. Our sampling areas were the Broken Spur Hydrothermal Field (BSHF), the Main Lucky Strike Hydrothermal Field (MLSHF), the Rainbow Hydrothermal Field (RHF) and the Menez Gwen Hydrothermal Field (MGHF), where we sampled high temperature and pressure hydrothermal vent fields with over 300\u00b0C and diffuse outflows with temperatures between 20\u00b0C and 200\u00b0C. <\/a><\/p>\n\n\n\n Main research questions:<\/strong><\/p>\n\n\n\n\n
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