FN Archimer Export Format
PT J
TI The Zircon Story of the Niger River: Time‐Structure Maps of the West African Craton and Discontinuous Propagation of Provenance Signals Across a Disconnected Sediment‐Routing System
BT 
AF Pastore, Guido
   Garzanti, Eduardo
   Vermeesch, Pieter
   Bayon, Germain
   Resentini, Alberto
   Braquet, Nadine
   Overare, Brume
AS 1:1;2:1;3:2;4:3;5:1;6:4;7:5,6;
FF 1:;2:;3:;4:PDG-REM-GEOOCEAN-ASTRE;5:;6:;7:;
C1 Laboratory for Provenance Studies Department of Earth and Environmental Sciences University of Milano‐Bicocca Milano, Italy
   London Geochronology Centre Department of Earth Sciences University College London London, UK
   Unité de Recherche Geosciences Marines Ifremer Plouzané, France
   Institut de Recherche pour le Développement IRD –UMR G‐eau INRAE Montpellier, France
   Department of Earth Sciences Memorial University of Newfoundland St. John's NL, Canada
   Department of Earth Sciences Federal University of Petroleum Resources Effurun, Nigeria
C2 UNIV MILANO BICOCCA, ITALY
   UNIV COLL LONDON, UK
   IFREMER, FRANCE
   IRD, FRANCE
   UNIV MEM NEWFOUNDLAND, CANADA
   UNIV FED PETROLEUM RESOURCES, NIGERIA
SI BREST
SE PDG-REM-GEOOCEAN-ASTRE
UM GEO-OCEAN
IN WOS Ifremer UMR
   copubli-france
   copubli-p187
   copubli-europe
   copubli-int-hors-europe
   copubli-sud
IF 3.9
TC 1
UR https://archimer.ifremer.fr/doc/00860/97240/106175.pdf
   https://archimer.ifremer.fr/doc/00860/97240/106176.docx
   https://archimer.ifremer.fr/doc/00860/97240/106177.xlsx
   https://archimer.ifremer.fr/doc/00860/97240/106178.xlsx
   https://archimer.ifremer.fr/doc/00860/97240/106179.xlsx
   https://archimer.ifremer.fr/doc/00860/97240/106180.kmz
LA English
DT Article
DE ;detrital-zircon geochronology;Zr/Hf ratio;Hf model ages;man shield;Nigeria basement complex;Niger and Benue rivers;sub-Saharan western Africa
AB The Niger River drains a large part of the West African Craton, where rocks ranging in age from Paleoarchean to recent offer an unexcelled opportunity to map the diverse time structures of sediment sources and provide essential information for provenance diagnoses. In this study, U‐Pb zircon dating is complemented with bulk‐sand geochemical (Zr, Hf, REE) and Nd‐Hf isotope data to pin‐point parent rocks of zircon grains and draw inferences on sediment generation across sub‐Saharan western Africa. In Upper Niger sand, zircon ages pass from exclusively Archean in Guinea headwaters to dominantly Paleoproterozoic in the Inner Delta in Mali, testifying to the progressive dilution by tributary sediment derived from the Birimian domain. Zircon ages abruptly change to dominantly Neoproterozoic downstream of the Inner Delta, becoming indistinguishable from those in Saharan eolian dunes across the Sahel. Most of the sediment generated in the headwaters is thus dumped in the marshlands and bedload is reconstituted downstream by recycling eolian sand. Zircon grains in the Lower Niger yielded virtually the same U‐Pb ages as in Benue sediment, indicating an overwhelming supply from the Benue tributary. In the Niger Delta, however, Archean zircons reappear, and both εNd and εHf values become notably more negative, indicating extensive reworking of sand deposited along the coastal plain at earlier times of wetter climate, when artificial barriers to the sediment flux did not exist in the upper to middle Niger River catchment. 
PY 2023
PD NOV
SO Journal Of Geophysical Research-earth Surface
SN 2169-9003
PU American Geophysical Union (AGU)
VL 128
IS 11
UT 001107056800001
DI 10.1029/2023JF007342
ID 97240
ER

EF