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Hot spot activity and tectonic settings near Amsterdam–St. Paul plateau (Indian Ocean)

DRS at CSIR-National Institute of Oceanography

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Title Hot spot activity and tectonic settings near Amsterdam–St. Paul plateau (Indian Ocean)
 
Creator Janin, M.
Hemond, C.
Guillou, H.
Maia, M.
Johnson, K.T.M.
Bollinger, C.
Liorzou, C.
Mudholkar, A.V.
 
Subject Tectonics
Antarctic plate
seamounts
hot spots
 
Description The Amsterdam–St. Paul (ASP) plateau is located in the central part of the Indian Ocean and results from the interaction between the ASP hot spot and the Southeast Indian Ridge (SEIR). It is located near the diffuse boundary between the Capricorn and Australian plates. The seamount chain of the Dead Poets (CDP) is northeast of the ASP plateau and may represent older volcanism related to the ASP hot spot; this chain consists of two groups of seamounts: (1) large flat-topped seamounts formed 8–10 Ma and (2) smaller conical seamounts formed during the last 2 Myr. The ASP hot spot has produced two pulses of magmatism that have been ponded under the ASP plateau and erupted along the divergent boundary between the Capricorn and Australian plates. The N65 degree orientation of the CDP as well as the seamount's elongated shapes support an opening motion between the Capricorn and Australian plates along a suture oriented in the N155 degree direction. This motion compared to the Antarctic plate amounts to an apparent velocity of 7.7 cm/yr northeastward for the Capricorn-Australian block. This motion does not fit with a fixed plume model. We suggest, therefore, that the ASP plume experienced a motion of about 1–2 cm/yr to the SW, which is opposite to the asthenospheric flow in this region and suggests a deep-seated plume
 
Date 2011-06-16T07:36:48Z
2011-06-16T07:36:48Z
2011
 
Type Journal Article
 
Identifier Journal of Geophysical Research (B: Solid Earth), vol.116(5); 2011; 17 pp; doi:10.1029/2010JB007800
http://drs.nio.org/drs/handle/2264/3870
 
Language en
 
Rights An edited version of this paper was published by AGU. Copyright [2011] AGU. To view the published open abstract, go to http://dx.doi.org/10.1029/2010JB007800
 
Publisher American Geophysical Union