FN Archimer Export Format
PT J
TI The Segmented Zambezi Sedimentary System from Source to Sink: 1. Sand Petrology and Heavy Minerals
BT 
AF Garzanti, Eduardo
   Pastore, Guido
   Resentini, Alberto
   Vezzoli, Giovanni
   Vermeesch, Pieter
   Ncube, Lindani
   Niekerk, Helena Johanna Van
   Jouet, Gwenael
   Dall’Asta, Massimo
AS 1:1;2:1;3:1;4:1;5:2;6:3;7:3;8:4;9:5;
FF 1:;2:;3:;4:;5:;6:;7:;8:PDG-REM-GM-LGS;9:;
C1 Laboratory for Provenance Studies, Department of Earth and Environmental Sciences, University of Milano-Bicocca, 20126 Milano, Italy
   London Geochronology Centre, Department of Earth Sciences, University College London, London WC1E 6BT, United Kingdom
   Department of Environmental Sciences, University of South Africa, Florida, South Africa
   Unité de Recherche Geosciences Marines, IFREMER (Institut Français de Recherche pour l’Exploitation de la Mer), CS 10070, 29280 Plouzané, France
   TOTAL Exploration and Production, CSTJF, Avenue Larribau, 64018 Pau Cedex Pau, France
C2 UNIV MILANO BICOCCA, ITALY
   UNIV COLL LONDON, UK
   UNIV SOUTH AFRICA, SOUTH AFRICA
   IFREMER, FRANCE
   TOTAL CSTJF, FRANCE
SI BREST
SE PDG-REM-GM-LGS
IN WOS Ifremer UPR
   copubli-france
   copubli-europe
   copubli-int-hors-europe
   copubli-sud
IF 2.661
TC 8
UR https://archimer.ifremer.fr/doc/00723/83467/91452.pdf
LA English
DT Article
CR PAMELA-MOZ04
BO Pourquoi pas ?
AB The Zambezi River rises at the center of southern Africa, flows across the low-relief Kalahari Plateau, meets Karoo basalt, plunges into Victoria Falls, follows along Karoo rifts, and pierces through Precambrian basement to eventually deliver its load onto the Mozambican passive margin. Reflecting its polyphase evolution, the river is subdivided into segments with different geological and geomorphological character, a subdivision finally fixed by man’s construction of large reservoirs and faithfully testified by sharp changes in sediment composition. Pure quartzose sand recycled from Kalahari desert dunes in the uppermost tract is next progressively enriched in basaltic rock fragments and clinopyroxene. Sediment load is renewed first downstream of Lake Kariba and next downstream of Lake Cahora Bassa, documenting a stepwise decrease in quartz and durable heavy minerals. Composition becomes quartzo-feldspathic in the lower tract, where most sediment is supplied by high-grade basements rejuvenated by the southward propagation of the East African rift. Feldspar abundance in Lower Zambezi sand has no equivalent among big rivers on Earth and far exceeds that in sediments of the northern delta, shelf, and slope, revealing that provenance signals from the upper reaches have ceased to be transmitted across the routing system after closure of the big dams. This high-resolution petrologic study of Zambezi sand allows us to critically reconsider several dogmas, such as the supposed increase of mineralogical “maturity” during long-distance fluvial transport, and forges a key to unlock the rich information stored in sedimentary archives, with the ultimate goal to accurately reconstruct the evolution of this mighty river flowing across changing African landscapes since the late Mesozoic. 
PY 2021
PD JUN
SO Journal Of Geology
SN 0022-1376
PU University of Chicago Press
VL 129
IS 4
UT 000693355300001
BP 343
EP 369
DI 10.1086/715792
ID 83467
ER

EF