Unnamed

Photo of this volcano
  • Country
  • Volcanic Region
  • Primary Volcano Type
  • Last Known Eruption
  • 10.73°N
  • 103.58°W

  • Unknown
     

  • 334040
  • Latitude
  • Longitude

  • Summit
    Elevation

  • Volcano
    Number

Most Recent Bulletin Report: October 2005 (BGVN 30:10) Citation IconCite this Report


November 2003 visit finds evidence of very recent eruption

In a recent publication, Rubin and van der Zander (2005) discuss radiometric methods for dating lavas as one means to establish eruption chronologies. Some of their techniques were applied to samples of fresh lava (erupted September-October 2003) found on the East Pacific Rise (EPR) at 10°44'N (Voight and others, 2004). This location lies ~ 1,900 km WNW of the Galápagos Islands. During a November 2003 biological sampling visit to the EPR at 10°44'N, divers in the submersible Alvin expected to be revisiting an established hydrothermal vent field. Instead, they found indicia all of which were consistent with a recent eruption, notably fresh lava, bacterial mats, and diffuse snow- blower vents issuing from lava collapses. The team acted immediately after the cruise by sending the lava samples to the University of Hawai`I for dating. Researchers there determined that an eruption had occurred within 1 to 2 months prior to the site visit. A hydrophone array (designated N-EPR) nominally monitored this part of the EPR since 1996, but not in real time. Unfortunately, the system failed to record data during the 2002-2004 interval due to a hardware problem.

Ages for lavas erupted within the past 1.5-2 years were determined with the 210Po-210Pb dating method (Rubin and others, 1994). To use this method, analyses should begin as soon as possible after samples are collected from suspected eruption locales. Radioactive disequilibrium is largest, and temporal resolution of the method is highest, immediately following eruption. According to Rubin and van der Zander (2005, p. 28) "Polonium is volatile at magmatic temperatures and degasses from magmas when they erupt. This creates an initial 210Po (half-life = 138.4 day) deficit relative to grand parental 210Pb in freshly erupted magmas. This deficit is subsequently erased with time via radioactive ingrowth toward secular equilibrium."

References. Rubin, K.H., Macdougall, J.D., and Perfit, M.R., 1994, 210Po-210Pb dating of recent volcanic eruptions on the seafloor: Nature, v. 368, p. 841-844.

Rubin, K., and van der Zander, I., 2005, Obtaining high-resolution chronologies of submarine lava eruptions: Better dating through radiochemistry: Ridge 2000 Events, v. 3 (Spring 2005), p. 28-30.

Voight, J. R., Zierenberg, R.A., McClain, J., and the Science Party: Batson, P., Beers, K., Daly, M., Dushman, B., Gollner, S., Govenar, B., Haney, T.A., Hourdez, S., Liow, L.H., Parker, C., Von Damm, K., Zekley, J., and Zelnio, K.A., 2004, FIELD cruise to the northern EPR: Discoveries made during biological investigations from 8°37'N to 12°48'N: Ridge 2000 Events, v. 2(1), p. 22-24.

Information Contacts: Ken Rubin, Department of Geology and Geophysics, SOEST, University of Hawai`I, 1680 East West Road, Honolulu, HI 96822, USA (Email: krubin@hawaii.edu).

The Global Volcanism Program has no Weekly Reports available for Unnamed.

Bulletin Reports - Index


Reports are organized chronologically and indexed below by Month/Year (Publication Volume:Number), and include a one-line summary. Click on the index link or scroll down to read the reports.

10/2005 (BGVN 30:10) November 2003 visit finds evidence of very recent eruption




Information is preliminary and subject to change. All times are local (unless otherwise noted)


October 2005 (BGVN 30:10) Citation IconCite this Report


November 2003 visit finds evidence of very recent eruption

In a recent publication, Rubin and van der Zander (2005) discuss radiometric methods for dating lavas as one means to establish eruption chronologies. Some of their techniques were applied to samples of fresh lava (erupted September-October 2003) found on the East Pacific Rise (EPR) at 10°44'N (Voight and others, 2004). This location lies ~ 1,900 km WNW of the Galápagos Islands. During a November 2003 biological sampling visit to the EPR at 10°44'N, divers in the submersible Alvin expected to be revisiting an established hydrothermal vent field. Instead, they found indicia all of which were consistent with a recent eruption, notably fresh lava, bacterial mats, and diffuse snow- blower vents issuing from lava collapses. The team acted immediately after the cruise by sending the lava samples to the University of Hawai`I for dating. Researchers there determined that an eruption had occurred within 1 to 2 months prior to the site visit. A hydrophone array (designated N-EPR) nominally monitored this part of the EPR since 1996, but not in real time. Unfortunately, the system failed to record data during the 2002-2004 interval due to a hardware problem.

Ages for lavas erupted within the past 1.5-2 years were determined with the 210Po-210Pb dating method (Rubin and others, 1994). To use this method, analyses should begin as soon as possible after samples are collected from suspected eruption locales. Radioactive disequilibrium is largest, and temporal resolution of the method is highest, immediately following eruption. According to Rubin and van der Zander (2005, p. 28) "Polonium is volatile at magmatic temperatures and degasses from magmas when they erupt. This creates an initial 210Po (half-life = 138.4 day) deficit relative to grand parental 210Pb in freshly erupted magmas. This deficit is subsequently erased with time via radioactive ingrowth toward secular equilibrium."

References. Rubin, K.H., Macdougall, J.D., and Perfit, M.R., 1994, 210Po-210Pb dating of recent volcanic eruptions on the seafloor: Nature, v. 368, p. 841-844.

Rubin, K., and van der Zander, I., 2005, Obtaining high-resolution chronologies of submarine lava eruptions: Better dating through radiochemistry: Ridge 2000 Events, v. 3 (Spring 2005), p. 28-30.

Voight, J. R., Zierenberg, R.A., McClain, J., and the Science Party: Batson, P., Beers, K., Daly, M., Dushman, B., Gollner, S., Govenar, B., Haney, T.A., Hourdez, S., Liow, L.H., Parker, C., Von Damm, K., Zekley, J., and Zelnio, K.A., 2004, FIELD cruise to the northern EPR: Discoveries made during biological investigations from 8°37'N to 12°48'N: Ridge 2000 Events, v. 2(1), p. 22-24.

Information Contacts: Ken Rubin, Department of Geology and Geophysics, SOEST, University of Hawai`I, 1680 East West Road, Honolulu, HI 96822, USA (Email: krubin@hawaii.edu).

Eruptive History


Summary of Holocene eruption dates and Volcanic Explosivity Indices (VEI).


Start Date Stop Date Eruption Certainty VEI Evidence Activity Area or Unit
2003 May (?) 2003 Nov Confirmed 0 Historical Observations

The Global Volcanism Program has no synonyms or subfeatures listed for Unnamed.

Photo Gallery


A low-temperature probe from the submersible vehicle Alvin is inserted into a "snow-blower" located in a collapse structure at 10 degrees 44 minutes N on the East Pacific Rise. The maximum temperatures reached only 9.5 degrees Centigrade. This extremely fresh lava flow was erupted within only a few weeks to a few months of an expedition in November 2003. The flow was covered by bacterial mats, had large amounts of bacterial floc ("snow-blowers") issuing from diffuse vents, and was sparsely populated by small animals.

Photo courtesy J.R. Voight, 2003 (Ridge2000, National Science Foundation).
See title for photo information.

Smithsonian Sample Collections Database


There are no samples for Unnamed in the Smithsonian's NMNH Department of Mineral Sciences Rock and Ore collection.

Affiliated Sites