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Transform-normal extension in the Victoria land Basin (Antarctica)

Content Provider	Springer Nature Link
Author	Ben Avraham, Zvi Busetti, Martina Spadini, Giacomo
Copyright Year	1998
Abstract	The Victoria Land Basin is the westernmost branch of the Ross Sea rift system. It runs parallel to the Transantarctic Mountains which experienced 5 km of uplift during the Cenozoic. Several subbasins, with more than 6 km of Cenozoic sedimentary fill, were formed along the Victoria Land Basin during the same period. The analysis of multichannel seismic profiles suggests that a large transcurrent system runs along the Lee Arch, at the center of the Victoria Land Basin, which separates the Discovery Graben from the eastern basins. As a result, large asymmetric basins have developed here. They are bounded on one side by the transcurrent fault system and on the other side by normal faults. This structural situation is similar to other large sedimentary basins along continental transforms where transform-normal extension takes place. Previous studies pointed out the strike-slip nature of the Victoria Land Basin. In the present study we propose the Transform-Normal Extension model as the best mechanism to explain the observed structural features and the reconstructed evolution.Il Victoria Land Basin costituisce la prozione più occidentale del sistema di rift del Mare di Ross. Esso si sviluppa parallelamente alle Montagne Transantartiche le quali hanno subito circa 5 km di sollevamento in età Cenozoica. Durante lo stesso periodo, nell’area del Victoria Land Basin, si sono formati diversi sub-bacini asimmetrici caratterizzati da coperture sedimentarie superiori a 6 km di spessore. L’analisi di profili sismici multicanale ci suggerisce che l’area in esame è interessata da un sistema trascorrente che attraversa la zona centrale del Victoria Land Basin percorrendo il «Lee Arch» e separando il «Discovery Graben» dai sub-bacini orientali. Questo assetto tettonico ha prodotto una serie di aree subsidenti asimmetriche attive durante tutto il Cenozoico. La caratteristica principale di tali bacini è che si sviluppano tra un sistema trascorrente e una direttrice di distensione normale paralleli tra loro. La situazione strutturale è simile a quella di altri bacini sviluppatisi lungo trasformi continentali e dove una distensione trasforme-normale è stata documentata. Studi precedenti hanno messo in evidenza la natura trascorrente del Victoria Land Basin. Nel presente studio gli autori propongono il «Modello di distensione trasforme-normale» come il miglior meccanismo possibile, in contrasto con i classici modelli dipull-apart, al fine di spiegare le caratteristiche strutturali osservate.
Starting Page	257
Ending Page	269
Page Count	13
File Format	PDF
ISSN	11206349
Journal	Rendiconti Lincei
Volume Number	9
Issue Number	4
e-ISSN	17200776
Language	Lithuanian
Publisher	Springer-Verlag
Publisher Date	1998-01-01
Publisher Place	Milan
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Strike-slip tectonics Transform-normal extension Antarctica Environment Geosciences Life Sciences Biomedicine general History of Science
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences Environmental Science Agricultural and Biological Sciences

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