CIR, Segment 3, Hydrothermal Plume Site

Muench et al. (1999): "First indications for hydrothermal activity on the Central Indian Ridge (CIR) were documented in 1987, when elevated CH4- and Mn-concentrations were detected in the water column (Plüger et al., 1990). The ‘Hydrothermal Plume Site' (HPS) is located in the third segment of the CIR north of the Rodriguez Triple Junction (RTJ) on the western flank of a CIR rift wall at 2840 m water depth. Despite some distinct hydrochemical anomalies comprising a plume, and the presence of pervasively altered basalt close to the neovolcanic zone, no hydrothermal precipitates were detected in this area."; Halbach and Muench (2000) decreased Mn and methane in following years suggests waning hydrothermal activity or megaplume; ZHU et al. (2008): "Significant turbidity anomalies were observed at four individual sections from 24°12′S to 23°56′S at the depth of 2500-3000 m along the eastern rift valley wall."