Microbial Methane Observatory for Seafloor Analysis (MIMOSA) geochemical data from a natural seep site in the Gulf of Mexico, June to October 2013

Laboratory analysis of Lander Deployed MIMOSA (MIcrobial Methane Observatory for Seafloor Analysis) samples. MIMOSA experiments use OsmoSamplers to continuously collect long term, in-situ samples. The samplers are connected to PVC chambers (~100mL volume) that are packed with either control mud from the site (referred to as control chamber), or with a mixture of control mud and oil (referred to as oil chamber). Samplers and chambers are placed on benthic landers and remain at the field site from June to October 2013 at GC600. The samplers slowly collect fluids from inside the chambers over this time frame and store the samples in long, thin bore tubing for analysis on shore. Once recovered, the samples were analyzed for sulfate, chloride, and major ion (strontium, lithium, sulfur, sodium, calcium, magnesium, potassium, barium boron, manganese, iron, silica) concentrations every 4-5 days.