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  Three North African dust source areas and their geochemical fingerprint

Jewell, A. M., Drake, N., Crocker, A. J., Bakker, N. L., Kunkelova, T., Bristow, C. S., et al. (2020). Three North African dust source areas and their geochemical fingerprint. Earth and Planetary Science Letters, 116645. doi:10.1016/j.epsl.2020.116645.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0007-5EE2-1 Version Permalink: http://hdl.handle.net/21.11116/0000-0007-5EFF-2
Genre: Journal Article

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 Creators:
Jewell, Amy M., Author
Drake, Nick1, Author              
Crocker, Anya J., Author
Bakker, Natalie L., Author
Kunkelova, Tereza, Author
Bristow, Charlie S., Author
Cooper, Matthew J., Author
Milton, J. Andrew, Author
Breeze, Paul S., Author
Wilson, Paul A., Author
Affiliations:
1Archaeology, Max Planck Institute for the Science of Human History, Max Planck Society, ou_2074312              

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Free keywords: North Africa, dust source, Bodélé Depression, radiogenic isotopes, Nd, 87Sr/86Sr
 Abstract: North Africa produces more than half of the world's atmospheric dust load. Once entrained into the atmosphere, this dust poses a human health hazard locally. It also modifies the radiative budget regionally, and supplies nutrients that fuel primary productivity across the North Atlantic Ocean and as far afield as the Amazonian Basin. Dust accumulation in deep sea and lacustrine sediments also provides a means to study changes in palaeoclimate, particularly those associated with rainfall climate change. Systematic analysis of satellite imagery has greatly improved our understanding of the trajectories of long-range North African dust plumes, but our knowledge of the dust-producing source regions and our ability to fingerprint their contribution to these export routes is surprisingly limited. Here we report new radiogenic isotope (Sr and Nd) data for sediment samples from known dust-producing substrates (dried river and lake beds), integrate them with published isotope data and weight them for dust source activation. We define three isotopically distinct preferential dust source areas (PSAs): a Western, a Central and an Eastern North African PSA. More data are needed, particularly from the Western PSA, but our results show a change in PSA dust source composition to more radiogenic Nd- and less radiogenic Sr-isotope values from west to east, in line with the overall decreasing age of the underlying bedrock. Our data reveal extreme isotopic heterogeneity within the Chadian region of the Central PSA, including an extremely distinctive geochemical fingerprint feeding the Bodélé Depression, the most active dust source on Earth. Our new analysis significantly improves the reliability by which windblown dust deposits can be geochemically fingerprinted to their distant source regions.

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Language(s): eng - English
 Dates: 2020-10-27
 Publication Status: Published online
 Pages: 12
 Publishing info: -
 Table of Contents: 1. Introduction
2. Materials and methods
2.1. Geographical definition of PSAs using remotely sensed data
2.2. Dust samples
2.3. Radiogenic isotope analysis
2.4. Generating geochemically representative PSA compositions
3. Results and discussion
3.1. PSA geomorphology
3.2. PSA geochemical fingerprints
3.2.1. Three geochemically distinct PSAs
3.2.2. Isotopic characterisation of the BodéléDepression and surrounding area
3.2.3. Effect of grain size on Sr and Nd isotope signature
4. Conclusions
 Rev. Type: -
 Identifiers: DOI: 10.1016/j.epsl.2020.116645
Other: shh2764
 Degree: -

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Title: Earth and Planetary Science Letters
  Other : Earth Planet. Sci. Lett.
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: - Sequence Number: 116645 Start / End Page: - Identifier: ISSN: 0012-821X
CoNE: https://pure.mpg.de/cone/journals/resource/954925395406