Vailulu'u Seamount, Samoa : life and death on an active submarine volcano
Hart, Stanley R.
Bailey, Bradley E.
Baker, Edward T.
Connelly, Douglas P.
German, Christopher R.
Jones, Daniel O. B.
Koppers, Anthony A. P.
Konter, Jasper G.
Pietsch, Theodore W.
Tebo, Bradley M.
Templeton, Alexis S.
Young, Craig M.
MetadataShow full item record
Submersible exploration of the Samoan hotspot revealed a new, 300-m-tall, volcanic cone, named Nafanua, in the summit crater of Vailulu'u seamount. Nafanua grew from the 1,000-m-deep crater floor in <4 years and could reach the sea surface within decades. Vents fill Vailulu'u crater with a thick suspension of particulates and apparently toxic fluids that mix with seawater entering from the crater breaches. Low-temperature vents form Fe oxide chimneys in many locations and up to 1-m-thick layers of hydrothermal Fe floc on Nafanua. High-temperature (81°C) hydrothermal vents in the northern moat (945-m water depth) produce acidic fluids (pH 2.7) with rising droplets of (probably) liquid CO2. The Nafanua summit vent area is inhabited by a thriving population of eels (Dysommina rugosa) that feed on midwater shrimp probably concentrated by anticyclonic currents at the volcano summit and rim. The moat and crater floor around the new volcano are littered with dead metazoans that apparently died from exposure to hydrothermal emissions. Acid-tolerant polychaetes (Polynoidae) live in this environment, apparently feeding on bacteria from decaying fish carcasses. Vailulu'u is an unpredictable and very active underwater volcano presenting a potential long-term volcanic hazard. Although eels thrive in hydrothermal vents at the summit of Nafanua, venting elsewhere in the crater causes mass mortality. Paradoxically, the same anticyclonic currents that deliver food to the eels may also concentrate a wide variety of nektonic animals in a death trap of toxic hydrothermal fluids.
Author Posting. © National Academy of Sciences, 2006. This article is posted here by permission of National Academy of Sciences for personal use, not for redistribution. The definitive version was published in Proceedings of the National Academy of Sciences 103 (2006): 6448-6453, doi:10.1073/pnas.0600830103.
Showing items related by title, author, creator and subject.
Zuchero, J. Bradley; Belin, Brittany J.; Mullins, R. Dyche (American Society for Cell Biology, 2012-01-19)Junction-mediating and regulatory protein (JMY) is a regulator of both transcription and actin filament assembly. In response to DNA damage, JMY accumulates in the nucleus and promotes p53-dependent apoptosis. JMY's ...
Intermediate to felsic middle crust in the accreted Talkeetna arc, the Alaska Peninsula and Kodiak Island, Alaska : an analogue for low-velocity middle crust in modern arcs Rioux, Matthew; Mattinson, James; Hacker, Bradley R.; Kelemen, Peter B.; Blusztajn, Jerzy S.; Hanghoj, Karen; Gehrels, George (American Geophysical Union, 2010-05-08)Seismic profiles of several modern arcs have identified thick, low-velocity midcrustal layers (Vp = 6.0–6.5 km/s) that are interpreted to represent intermediate to felsic plutonic crust. The presence of this silicic crust ...
Hayes, Christopher T.; Anderson, Robert F.; Fleisher, Martin Q.; Vivancos, Sebastian M.; Lam, Phoebe J.; Ohnemus, Daniel C.; Huang, Kuo-Fang; Robinson, Laura F.; Lu, Yanbin; Cheng, Hai; Edwards, R. Lawrence; Moran, S. Bradley (2015-01)The natural radionuclides 231Pa and 230Th are incorporated into the marine sediment record by scavenging, or adsorption to various particle types, via chemical reactions that are not fully understood. Because these ...