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Volcano News from Ol Doinyo Lengai:

View into the crater of Ol Doinyo Lengai volcano (photo: Gian Schachenmann)
Monday, Jul 08, 2013
The volcano continues to be active, and produce natrocarbonatite lava that slowly fills up the crater. A small cone of natrocarbonatite lava is forming on the western side of Lengai's crater, which formed in 2008 during a series of violent explosions that destroyed the former bizarre crater terrace filling the north crater, famous for the bizarre "hornitos" of white and gray lava. ... [more]
Sunday, Dec 09, 2012
Spattering and lava flows of carbonatite lava inside the deep summit crater of Lengai have been recently observed by climbers. The crater which formed during explosive activity in 2008 is gradually being filled by spatter cones and small lava flows. [more]

-> Lengai volcano photos

An explosive eruption from Tanzania's Ol Doinyo volcano in 1966.  Explosive activity began in August 1966, near the end of an eruption beginning in 1960 that consisted of quiet emission of lava flows in the summit crater.  Ash deposits from previous eruptions whiten the volcano's slopes like snow. (Photo by Gordon Davies, 1966 / courtesy of Celia Nyamweru, Kenyatta University).
An explosive eruption from Tanzania's Ol Doinyo volcano in 1966. Explosive activity began in August 1966, near the end of an eruption beginning in 1960 that consisted of quiet emission of lava flows in the summit crater. Ash deposits from previous eruptions whiten the volcano's slopes like snow. (Photo by Gordon Davies, 1966 / courtesy of Celia Nyamweru, Kenyatta University).
The active north crater of Ol Doinyo Lengai volcano
The active north crater of Ol Doinyo Lengai volcano
Observing strombolian eruptions of black natrocarbonatite lava at Lengai volcano
Observing strombolian eruptions of black natrocarbonatite lava at Lengai volcano
Night-time scene inside the active crater of Lengai
Night-time scene inside the active crater of Lengai
Whitened natrocarbonatite lava and a steep crater cone,- called hornito
Whitened natrocarbonatite lava and a steep crater cone,- called hornito

Ol Doinyo Lengai volcano

Stratovolcano 2890 m
Tanzania, -2.75°S / 35.9°E
Current status: erupting (4 out of 5)
Ol Doinyo Lengai webcams / live data
Last update: 8 Jul 2013 (effusion of natrocarbonatite lava inside the crater)
Typical eruption style: Explosive activity. In addition, at least during the past +-30 years near-continuous effusion and mildly explosive eruption of natrocarbonatite lava from vents inside the crater, sometimes overflowing over the rim, is taking place.
Ol Doinyo Lengai volcano eruptions: 1550 BC (?), 50 AD (?), 700 AD (?), 1350 (?), 1880, 1882, 1904, 1907, 1914, 1916, 1921, 1926, 1940, 1954, 1955, 1958, 1960, 1967, 1983, 1994, 2006, 2007-ongoing Erupting hornito at Lengai volcano No recent earthquakes
TimeMag. / DepthDistanceLocation
Ol Doinyo Lengai, a symmetrical, steep classical stratovolcano rises majestically about 2000m from the East Africal Rift Valley depression to a summit elevation of 2890 m. To the Maassai people, it is home of God, which is also the meaning of the name. Ol Doinyo Lengai is the only active volcano that erupts natrocarbonatite lava. Ash eruptions from the new crater cone of Lengai volcano in 2008

Background:

Ol Doinyo Lengai is an extremely fascinating volcano: it is the only active volcano known to erupt carbonatite lava, a sensational discovery scientists made as recently as in the 1960s: the lavas it erupts are NOT melts based on silica, but on natroncarbonate!
Thus, the temperatures of these lavas are much lower, "only" about 600 deg. C., and Lengai's lava does not emit enough light to glow during day,- only at night, a dull reddish glow that does not illuminate anything is visible. Also because of its peculiar chemical composition, the lava is extremely fluid and behaves very much like water, with the exception that it is black like oil. After it is cooled down it quickly alters and becomes a whitish powder.

Geologically, the present-day cone of the volcano was constructed about 15,000 years ago. Historical eruptions have been moderate to small explosive events. In addition to its intermittent explosive activity at intervals of typically years or decades, numerous natrocarbonitite lava flows have been erupted from vents on the floor of the active summit crater.

The depth and morphology of the active (northern) crater have changed dramatically during the course of historical eruptions, ranging from steep craters walls about 200 m deep in the mid-20th century to shallow platforms mostly filling the crater. Long-term lava effusion in the summit crater beginning in 1983 had by the turn of the century mostly filled the northern crater; by late 1998 uptill today lava had begun overflowing the crater rim.

Ol Doinyo Lengai Photos:



Activity in 2010 - natrocarbonatite flows on the crater bootom
Similarly to previous phases, new natrocarbonatite lava is being erupted from vents at the bottom of the new crater. If this activity continues, it might once again fill the crater.

Links and further info:

The Ol Doinyo Lengai web site / it.stlawu.edu/~cnya/
Celia Nyamweru’s Website - This is the most comprehensive website on the history of Ol Doinyo Lengai, by an expert on the Rift Valley.
OL DOINYO LENGAI - The Mountain of God / www.mtsu.edu/~fbelton/lengai.html
Fred Belton's extensive website dedicated to Lengai. Fred visits Lengai (almost) every year and comes back with lots of information and observation about the volcano's activity. Extensive News, other links, expedition infos, photos.

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