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Agulhas Plateau, SW Indian Ocean: New evidence for excessive volcanism
Author(s) -
UenzelmannNeben Gabriele,
Gohl Karsten,
Ehrhardt Axel,
Seargent Michael
Publication year - 1999
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1029/1999gl900391
Subject(s) - geology , volcanism , plateau (mathematics) , igneous rock , volcanic plateau , oceanic crust , lava , flood basalt , large igneous province , basement , cretaceous , earth science , sedimentary rock , crust , geochemistry , paleontology , volcano , magmatism , subduction , tectonics , archaeology , mathematical analysis , mathematics , history
A new set of seismic reflection and refraction lines has been interpreted regarding the basement and crustal structure of the southern Agulhas Plateau. A large number of extrusion centres were identified. Lava flows dip away from those extrusion centres and form subparallel‐stratified sequences. We interpret those extrusion centres as the result of excessive volcanism in course of the separation of the southern Agulhas Plateau from the Maud Rise. Since the sedimentary layers appear to be little affected by the volcanism, that episode obviously ceased before onset of sedimentation in Late Cretaceous times. We have not found evidence for continental fragments within overthickened, predominantly oceanic crust. We therefore propose that the Agulhas Plateau belongs to the world‐wide suite of Large Igneous Provinces (LIP) of predominantly oceanic origin.