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CIR, northern

National Jurisdiction: 
Depth (m)
Maximum or Single Reported Depth: 
Tectonic setting: 
Full Spreading Rate (mm/a): 
Host Rock: 
Deposit Type: 
Notes on Vent Field Description: 
position and seafloor depth of plume on Segment 6 estimated from slide "Plume detection -Central Indian Ridge" (Son 2011); Park (2010): "Hydrothermal plume signatures were also observed at all 5 surveyed segments, indicating the location of several hydrothermal vents along the northern CIR"; Kim (2010); "rock sampling and CTD casts and tows were performed in northern half of the multibeam survey area in the second leg (IR09 Leg2). Plume signatures were observed at all 5 surveyed segments, suggesting vigorous hydrothermal activities along the northern CIR. However, the optical signals (light transparency and backscattering) of the nearly every cast along the axial valley of the CIR showed increased background level, which might be due to higher level of suspended particles within the axial valley not only by widespread hydrothermal plumes but also by other processes like resuspension. Onboard dissolved methane analysis indicates that the greater part of the plume signals are originated from hydrothermal venting, not by resuspension."
Year and How Discovered (if active, visual confirmation is listed first): 
2010 plume only
Discovery References (text): 
Kim, J. (2010) Hydrothermal Exploration along the Northern Central Indian Ridge, 8°-12° S: Preliminary Results of Bathymetry, Volcanic Rock, and Hydrothermal Plume. 39th Underwater Mining Institute.
Other References (text): 
Park, S.-H. (2010) Korea national report, p. 34, InterRidge News 19.
Son, J.-W. (2011) The Current Activities of KORDI’s Environmental Study for Deep-Sea Mining. Accessed online at: