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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Expanded glaciers during a dry and cold last glacial maximum in equatorial East Africa
Geology, Volume 42, No. 6, Year 2014
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Description
Glaciers on the world's highest tropical mountains are among the most sensitive components of the cryosphere, yet the climatic controls that infl uence their fl uctuations are not fully understood. Here we present the fi rst 10Be ages of glacial moraines in Africa and use these to assess the climatic conditions that infl uenced past tropical glacial extents. We applied 10Be surface exposure dating to determine the ages of quartz-rich boulders atop moraines in the Rwenzori Mountains (~1°N, 30°E), located on the border of Uganda and the Democratic Republic of Congo. The 10Be ages document expanded glaciers ca. 23.4 and 20.1 ka, indicating that glaciers in equatorial East Africa advanced during the global Last Glacial Maximum (ca. 26-19.5 ka). A comparison of these moraine ages with regional paleoclimate records indicates that Rwenzori glaciers expanded contemporaneously with dry and cold conditions. Recession from the moraines occurred after ca. 20.1 ka, similar in timing to a rise in air temperature documented in East African lake records. Our results suggest that, on millennial time scales, past fl uctuations of Rwenzori glaciers were strongly infl uenced by air temperature. © 2014 Geological Society of America.
Authors & Co-Authors
Kelly, Meredith A.
United States, Hanover
Dartmouth College
Russell, James M.
United States, Providence
Brown University
Baber, Margaret B.
United States, Hanover
Dartmouth College
Howley, Jennifer A.
United States, Hanover
Dartmouth College
Loomis, Shannon E.
United States, Providence
Brown University
Zimmerman, Susan R.H.
United States, Livermore
Lawrence Livermore National Laboratory
Nakileza, Bob R.
Uganda, Kampala
Makerere University
Lukaye, Joshua
Uganda
Ministry of Energy and Mineral Development
Statistics
Citations: 30
Authors: 8
Affiliations: 5
Identifiers
Doi:
10.1130/G35421.1
ISSN:
00917613
e-ISSN:
19432682
Research Areas
Environmental
Study Locations
Multi-countries
Congo
Uganda