Title :

New constraints on elemental and Pb and Nd isotope compositions of South American and Southern African aerosol sources to the South Atlantic Ocean

Author(s) :

Khondoker, R. [Auteur]
Weiss, D. [Auteur]
van de Flierdt, T. [Auteur]
Rehkamper, M. [Auteur]
Kreissig, K. [Auteur]
Coles, B.J. [Auteur]
Strekopytov, S. [Auteur]
The Natural History Museum [London] [NHM]
Humphreys-Williams, E. [Auteur]
The Natural History Museum [London] [NHM]
Dong, S. [Auteur]
Centre de Recherches Pétrographiques et Géochimiques [CRPG]
Bory, A. [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Bout‑roumazeilles, Viviane [Auteur]
Laboratoire d’Océanologie et de Géosciences (LOG) - UMR 8187 [LOG]
Smichowski, P. [Auteur]
Comisión Nacional de Energía Atómica [ARGENTINA] [CNEA]
Cid-Agüero, P. [Auteur]
Universidad de Magallanes [UMAG]
Babinski, M. [Auteur]
Instituto de Geociências [São Paulo]
Losno, R. [Auteur]
Laboratoire Interuniversitaire des Systèmes Atmosphériques [LISA (UMR_7583)]
Monna, F. [Auteur]
Archéologie, Terre, Histoire, Sociétés [Dijon] [ARTeHiS]

Journal title :

Applied Geochemistry

Pages :

372-384

Publisher :

Elsevier

Publication date :

2018

ISSN :

0883-2927

English keyword(s) :

Isotopic and elemental composition
Source characterisation
Geochemical assessment
Aerosol
South America
Southern Africa
South Atlantic Ocean

HAL domain(s) :

Planète et Univers [physics]/Sciences de la Terre/Géochimie
Planète et Univers [physics]/Océan, Atmosphère

English abstract : [en]

Improving the geochemical database available for characterising potential natural and anthropogenic aerosol sources from South America and Southern Africa is a critical precondition for studies aimed at understanding trace ...
Show more >Improving the geochemical database available for characterising potential natural and anthropogenic aerosol sources from South America and Southern Africa is a critical precondition for studies aimed at understanding trace metal controls on the marine biogeochemical cycles of the South Atlantic Ocean. We here present new elemental and isotopic data for a wide range of sample types from South America and Southern Africa that are potentially important aerosol sources. This includes road dust from Buenos Aires and lichen samples from Johannesburg, soil dust from Patagonia, volcanic ash from the Andean volcanic belt, and aerosol samples from São Paulo. All samples were investigated for major (Al, Ca, Fe, Mg, Na, K, Mn) and trace element (Cd, Co, Cr, Cu, Ni, Pb, REE, Sc, Th, Y, V, Zn) concentrations and Nd and Pb isotopic compositions. We show that diagrams of 208Pb/207Pb vs. εNd, 208Pb/207Pb vs. Pb/Al, 1/[Pb], Zn/Al, Cd/Al, Cu/Al, and εNd vs. Pb/Al, and 1/[Nd] are best suited to separate South American and South African source regions as well as natural and anthropogenic sources. A subset of samples from Patagonia and the Andes was additionally subjected to separation of a fine (<5 μm) fraction and compared to the composition of the bulk sample. We show that differences in the geochemical signature of bulk samples between individual regions and source types are significantly larger than between grain sizes. Jointly, these findings present an important step forward towards a quantitative assessment of aeolian trace metal inputs to the South Atlantic Ocean.Show less >

Language :

Anglais

Peer reviewed article :

Oui

Audience :

Internationale

Popular science :

Non

Collections :

• Laboratoire d'Océanologie et de Géosciences (LOG) - UMR 8187

Source :

Harvested from HAL