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Oligocene-Miocene spreading history of the northern South Fiji Basin and implications for the evolution of the New Zealand plate boundary ArchiMer
Herzer, R. H.; Barker, D. H. N.; Roest, Walter; Mortimer, N..
A tectonic model of the evolution of the northern half of the South Fiji Basin, including the Minerva Triple Junction and Cook Fracture Zone, is developed from regional gravity, multibeam bathymetry, and a new interpretation of magnetic anomalies pinned to radiometric dates of oceanic crust in the basin. The geometry and age of a portion of the Minerva Triple Junction and the Cook-Minerva spreading center (the connection from the triple junction to the Cook Fracture Zone, which accommodated coeval opening of the Norfolk Basin), are resolved with multibeam bathymetry and magnetics. The South Fiji Basin opened from about 34 to 15 Ma in an anticlockwise sweep about an Euler pole located at the northern end of the present Lau Ridge. This rotation and a rigidly...
Tipo: Text Palavras-chave: South Fiji Basin; Back-arc basin evolution; Multibeam bathymetry; Magnetic anomalies; Gravity model; New Zealand plate boundary.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00030/14112/11362.pdf
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Late Quaternary geomorphology and sedimentary processes in the Zambezi turbidite system (Mozambique Channel) ArchiMer
Fierens, Ruth; Droz, Laurence; Toucanne, Samuel; Raisson, François; Jouet, Gwenael; Babonneau, Nathalie; Miramontes Garcia, Elda; Landurain, Steven; Jorry, Stephan.
The morphology and present-day sediment distribution of the Zambezi turbidite system was investigated using new bathymetric and sub-bottom profiler data as part of the PAMELA research project. The Zambezi turbidite system is composed of two depositional systems: a channelized fan (the Zambezi Fan) and a semi-confined fan (in the lntermediate Basin). The Zambezi Fan includes the Zambezi Valley, which is deeply incised in the Mozambique Channel and is more than three times as large and deep as the great Tanzanian and North Atlantic Mid-Ocean channels. The erosion in the Zambezi Valley is evidenced by its V-shaped morphology and the existence of a U-shaped thalweg affected by several generations of incisions. Based on echo facies and cores from literature,...
Tipo: Text Palavras-chave: Zambezi turbidite system; Late Quaternary; Multibeam bathymetry; Sub-bottom seismic profiles.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00483/59425/62240.pdf
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Overview of the Bosphorus Depositional Fan from Data Sets Recovered on the Black Sea Shelf off the Strait of Istanbul ArchiMer
Lericolais, Gilles; Algan, Oya; Morigi, Caterina; Okay, Seda; Kirci-elmas, Elmas; Cifci, Gunay.
Since the preliminary mapping of the northern Bosphorus outlet of the Black Sea continental shelf by the 90’s NATO project, an important data set bringing morphological, seismic and sedimentological information is now available to describe there a shallow fan system consisting of a main channel and short distributary branches, levees, and sediment waves, correlative to a southern source flowing to the north. This paper brings complementary quantitative data from landscape at the eastern and western shelf area of the shallow fan system. It confirms that the Bosphorus outlet fan preserved on the shelf surface provides an important record of surface water flow. To deduce the history of the Marmara/Black Sea last connexion, it is fundamental to understand how...
Tipo: Text Palavras-chave: Bosphorus; Black Sea; Seismic; Sediment cores; Multibeam bathymetry; Shallow fan.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00501/61254/64838.pdf
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