East African weathering dynamics controlled by vegetation-climate feedbacks
AuthorIvory, Sarah J.
McGlue, Michael M.
Ellis, Geoffrey S.
Cohen, Andrew S.
AffiliationUniv Arizona, Dept Geosci
MetadataShow full item record
PublisherGEOLOGICAL SOC AMER, INC
CitationSarah J. Ivory, Michael M. McGlue, Geoffrey S. Ellis, Adam Boehlke, Anne-Marie Lézine, Annie Vincens, Andrew S. Cohen; East African weathering dynamics controlled by vegetation-climate feedbacks. Geology ; 45 (9): 823–826. doi: https://doi.org/10.1130/G38938.1
Rights© 2017 Geological Society of America.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at firstname.lastname@example.org.
AbstractTropical weathering has important linkages to global biogeochemistry and landscape evolution in the East African rift. We disentangle the influences of climate and terrestrial vegetation on chemical weathering intensity and erosion at Lake Malawi using a long sediment record. Fossil pollen, microcharcoal, particle size, and mineralogy data affirm that the detrital clays accumulating in deep water within the lake are controlled by feedbacks between climate and hinterland forest composition. Particle-size patterns are also best explained by vegetation, through feedbacks with lake levels, wildfires, and erosion. We develop a new source-to-sink framework that links lacustrine sedimentation to hinterland vegetation in tropical rifts. Our analysis suggests that climate-vegetation interactions and their coupling to weathering/erosion could threaten future food security and has implications for accurately predicting petroleum play elements in continental rift basins.
Note12 month embargo; published online: 26 July 2017
VersionFinal accepted manuscript
SponsorsU.S. National Science Foundation [EAR-0602404]; U.S. Geological Survey; American Chemical Society-Petroleum Research Fund program [54376-DNI8]