Geochemical and mineralogical evidence for Sahara and Sahel dust additions to Quaternary soils on Lanzarote, eastern Canary Islands, Spain

Authors

Daniel R. Muhs, U.S. Geological SurveyFollow
James Budahn, U.S. Geological Survey
Gary Skipp, U.S. Geological SurveyFollow
Joseph M. Prospero, University of MiamiFollow
DeAnna Patterson, ATA Services, Inc., Lakewood, CO
E. Arthur Bettis III, University of Iowa

Date of this Version

2010

Citation

Terra Nova, 22, 399–410, 2010

doi: 10.1111/j.1365-3121.2010.00949.x

Comments

U.S. government work

Abstract

Africa is the most important source of dust in the world today, and dust storms are frequent on the nearby Canary Islands. Previous workers have inferred that the Sahara is the most important source of dust to Canary Islands soils, with little contribution from the Sahel region. Soils overlying a late Quaternary basalt flow on Lanzarote, Canary Islands, contain, in addition to volcanic minerals, quartz and mica, exotic to the island!s bedrock. Kaolinite in the soils also likely has an exotic origin. Trace-element geochemistry shows that the soils are derived from varying proportions of locally derived basalt and African dust. Major-element geochemistry, clay mineralogy and interpretation of satellite imagery suggest that dust additions to the Canary Islands come not only from the Sahara Desert, but also from the Sahel region.