CALL FOR PROPOSALS:

Field Trips (deadline: 1 Dec. 2010)
Technical Sessions (deadline: 11 Jan. 2011)
Short Courses (deadline: 1 Feb. 2011)
Abstracts Deadline: 26 July 2011

ORGANIZERS

Harvey Thorleifson, Chair
Minnesota Geological Survey
Carrie Jennings, Vice Chair
Minnesota Geological Survey
David Bush, Technical Program Chair
University of West Georgia
Jim Miller, Field Trip Chair
University of Minnesota Duluth
Curtis M. Hudak, Sponsorship Chair
Foth Infrastructure & Environment, LLC

Paper No. 10

Presentation Time: 9:00 AM-6:00 PM

MELILITE-BEARING LAPILLI FROM OLDOINYO LENGAI, TANZANIA:EVIDENCE OF CHANGING MINERALOGY WITHIN A SINGLE ERUPTION

FINN, Kiel D. and MCHENRY, Lindsay J., Geosciences, University of Wisconsin- Milwaukee, 3209 N Maryland Ave, Milwaukee, WI 53211, kielfinn@uwm.edu

Oldoinyo Lengai in Tanzania is currently the only volcano in the world erupting crabonatitic material. However, Lengai has a long history of explosively erupting silicate material in between effusive eruptions of carbonatites. Liquid immiscibility has been theorized to occur between these two phases. Lapilli from the 2008 summer eruption at Lengai have been collected and mineralogical analysis by x-ray diffraction has revealed the presence of melilite. This appearance of melilite has only occurred a few times at Lengai within recorded time, and analysis of earlier eruptive products in 2007 do not show the presence of melilite. The implications on crystallizing conditions within the magma chamber are presented through textural and mineralogical analysis of the lapilli.

Session No. 33--Booth# 167

Volcanology (Posters)

Sunday, 9 October 2011: 9:00 AM-6:00 PM

Hall C (Minneapolis Convention Center)

Geological Society of America Abstracts with Programs. Vol. 43, No. 5, p.103

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