Notes on Vent Field Description:
Tevnia site named after worm tubes (might not be Tevnia) that are observed in oxidized areas; 200-m high, axis-facing fault scarp; fault scarp hydrothermal mineralization; also visited on FIX08-II cruise with submersible Alvin; Haymon et al. (2005): "We describe the first known seafloor expressions of hydrothermal discharge from tectonically formed abyssal hills flanking a fast-spreading ridge. Seafloor manifestations of fluid venting from two young East Pacific Rise abyssal hills (0.1 Ma at 10°20′N, 103°33.2′W; 0.5 Ma at 9°27′N, 104°32.3′W) include fault-scarp hydrothermal mineralization and macrofauna; fault-scarp flocculations containing hyperthermophilic microbes; and hilltop sediment mounds and craters possibly created by fluid expulsion."
Notes Relevant to Biology:
unidentified worm tubes; Haymon et al. (2005): "divers' observations of live “dandelion” colonial siphonophores and galatheid crabs suggest that hydrothermal fluid discharge either was ongoing and invisibly diffuse, or had ceased very recently (within months)."
Year and How Discovered (if active, visual confirmation is listed first):
1994 submersible Alvin did not confirm activity
Discovery References (text):
Haymon, R. et al. (2004) Evidence for Pulsed Hydrothermal Venting from Young Abyssal Hills on the EPR Flank Suggests Frequent Seismic Pumping of Ridge Flank Fluid Flow. Eos Trans. AGU, 85(47), Fall Meet. Suppl., Abstract B13A-0173
Haymon et al. (2005) Manifestations of hydrothermal discharge from young abyssal hills on the fast-spreading East Pacific Rise flank. Geology 33: 153-156, doi: 10.1130/G21058.1.