Notes on Vent Field Description:
MOR-hotspot intersection for Foundation Seamount chain; Hekinian et al. (1997): "Active sulfide chimneys and temperature anomalies were detected during a deep-towed television camera survey along the PAR axis near 37 38.88'S-110 51.81'W at 2240 m depths [Devey et al., 1997]."; Devey et al. (1997): (note, does not say active sulfide chimneys observed) "Camera and water temperature observations showed that the graben is bounded by normal faults where a thermal anomaly was detected. Broken sulphide chimneys and thermophilic animal communities (clams, vent fish and crabs) suggest active hydrothermal venting in the region."; Stoffers et al. (2002): "We examined a 630 km-long segment of the northern PAR bounded by large left-stepping overlapping spreading centres (OSCs) near 36.5°S and 41.5°S... 65 stations were devoted to recovering seafloor samples in conjunction with video observations of hydrothermal activity and vent fauna.", "Widespread diffuse venting ... is associated with the young silicic flows in the cleft of the 37°40’S dome."; 2005 cruise: http://www.mbari.org/expeditions/EasterMicroplate/index.htm
Notes Relevant to Biology:
clams, vent fish and crabs, suspension feeders
Year and How Discovered (if active, visual confirmation is listed first):
1997 video survey L'Atalante (do not know if activity confirmed); 1995 TV survey did not confirm activity; 2001 towed video and TV-grab definitely confirmed
Discovery References (text):
Hekinian et al. (1997) Intraplate versus ridge volcanism on the Pacific-Antarctic Ridge near 37°S -111°W. JOURNAL OF GEOPHYSICAL RESEARCH 102(B6): 12265-12286
Devey et al. (1997) The Foundation Seamount chain: a first survey and sampling. Marine Geology 137: 191-200, doi:10.1016/S0025-3227(96)00104-1.
Other References (text):
Stoffers et al., InterRidge News, 11(1), 30-32, 2002, Widespread Silicic Volcanism and Hydrothermal Activity on the Northern Pacific-Antarctic Ridge
Stecher, J. et al. (2002) Faunal assemblages on the Pacific-Antarctic Ridge near the Foundation Seamount Chain (37 30'S, 110 30'W). Cahiers Biol. Mar. 43: 271-274.