The Chemistry of Hydrothermal Plumes Along the Galapagos Spreading Center (original) (raw)

2006

Abstract

During the 2005-06 GalAPAGoS expedition, we conducted nested sonar, plume, and camera surveys along a 300 n.m.-long portion of the Galapagos Spreading Center (GSC) where the ridge intersects the Galapagos hotspot between 94.5° and 89.5°W. Hydrothermal plumes were located by placing a variety of sensors on the clump weight of the DSL-120, which was towed approximately 100 m above the seafloor. These sensors included the vents in situ analyzer (nee SUAVE), which measured Fe, Mn, and pH; a redox potential (Eh) sensor; an optical backscatter sensor; a METs methane analyzer; and a CTD. These sensors were uploaded in real time allowing us to monitor for plumes during the tow. In addition, the tow line of the DSL-120 carried a vertical array of optical backscatter sensors (MAPRs). Almost all of the plumes found were identified solely from the data uploaded to the ship in real time and were confirmed from the vertical MAPR array. The MAPR array provided information on the rise height and ve...

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