Axial Seamount, CASM

position given for T&S vent; temperature measured in 2015 was 291 C (W. Chadwick, pers. comm.); vent field and lava flow in northern area of caldera; small vent field with active sulfide deposits and low-temperature Fe oxide and silica chimneys in the caldera of an axial seamount; "CASM Virtual Site" webpage accessed 23 April 2015, http://www.pmel.noaa.gov/eoi/nemo/explorer/casm.html, "The CASM site is noteworthy because it was the first active hydrothermal vent site discovered in the NE Pacific"; http://axial2015.blogspot.com/2015/08/second-jason-dive.html, accessed 16 Sept. 2015, "The high-temperature vents at CASM are located down inside an older eruptive fissure that is 20 m (64 ft) wide and 10 m (32 ft) deep"; Area 2B in Crane et al. (1985); note North Rift Zone diffuse flow vents to north of CASM (Herzig et al. 1997) and eruption in 2015 (http://axial2015.blogspot.com/2015/08/first-jason-dive.html#J802Highlights, accessed 16 Sept. 2015); Axial volcano is in Cobb-Eikelberg hot spot chain;