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• W2786889968 abstract "Long-range transport of African dust plays an important role in understanding dust-climate relationships including dust source areas, dust pathways and associated atmospheric and/or oceanic processes. Clay-sized Sr–Nd–Hf isotopic compositions can be used as geochemical fingerprints to constrain dust provenance and the pathways of long-range transported mineral dust. We investigated the clay-sized Sr–Nd–Hf isotopic composition of surface samples along four transects bordering the Sahara Desert. The transects are from Mali, Niger/Benin/Togo, Egypt and Morocco. Our results show that the Mali transect on the West African Craton (WAC) produces lower εNd (εNd-mean = −16.38) and εHf (εHf-mean = −9.59) values than the other three transects. The Egyptian transect exhibits the lowest 87Sr/86Sr ratios (87Sr/86Srmean = 0.709842), the highest εHf (εHf-mean = −0.34) and εNd values of the four transects. Comparison of the clay-sized Sr–Nd–Hf isotopic values from our North African samples to transatlantic African dust collected in Barbados demonstrates that the dust's provenance is primarily the western Sahel and Sahara as well as the central Sahel. Summer emission dust is derived mainly from the western Sahel and Sahara regions. The source of transatlantic dust in spring and autumn is more varied than in the summer and includes dust not only from western areas, but also south central areas. Comparison of the Sr–Nd–Hf isotopic fingerprints between the source and sink of transatlantic dust also suggests that a northwestward shift in dust source occurs from the winter, through the spring and into the summer. The isotopic data we develop here provide another tool for discriminating changes in dust archives resulting from paleoenvironmental evolution of source regions." @default.
• W2786889968 created "2018-02-23" @default.
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• W2786889968 date "2018-03-01" @default.
• W2786889968 modified "2023-10-18" @default.
• W2786889968 title "Sr–Nd–Hf isotopic fingerprinting of transatlantic dust derived from North Africa" @default.
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• W2786889968 doi "https://doi.org/10.1016/j.epsl.2018.01.004" @default.
• W2786889968 hasPublicationYear "2018" @default.
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