Petrological and geochemical variations along the Mid-Atlantic Ridge between 46°S and 32°S: Influence of the Tristan da Cunha mantle plume

1985 ◽  
Vol 49 (6) ◽  
pp. 1445-1464 ◽  
Author(s):  
Susan E. Humphris ◽  
Geoffrey Thompson ◽  
Jean-Guy Schilling ◽  
Richard H. Kingsley
Keyword(s):  
Mantle Plume ◽  
Tristan Da Cunha ◽  
Geochemical Variations ◽  
Mid Atlantic Ridge

Influence of the Sierra Leone mantle plume on the equatorial Mid-Atlantic Ridge: A Nd-Sr-Pb isotopic study

1994 ◽  
Vol 99 (B6) ◽  
pp. 12005-12028 ◽  
Author(s):  
J.-G. Schilling ◽  
B. B. Hanan ◽  
B. McCully ◽  
R. H. Kingsley ◽  
D. Fontignie
Keyword(s):  
Sierra Leone ◽  
Mantle Plume ◽  
Isotopic Study ◽  
Mid Atlantic Ridge

Petrologic and geochemical variations along the Mid-Atlantic Ridge from 29 degrees N to 73 degrees N

1983 ◽  
Vol 283 (6) ◽  
pp. 510-586 ◽  
Author(s):  
J. G. Schilling ◽  
M. Zajac ◽  
R. Evans ◽  
T. Johnston ◽  
W. White ◽  
...  
Keyword(s):  
Geochemical Variations ◽  
Mid Atlantic Ridge

scholarly journals Mid-Atlantic Ridge: zero-age geochemical variations between Azores and 22°N

Nature ◽  
1980 ◽  
Vol 286 (5770) ◽  
pp. 209-212 ◽  
Author(s):  
H. Bougault ◽  
M. Treuil
Keyword(s):  
Geochemical Variations ◽  
Mid Atlantic Ridge

scholarly journals Seafloor evidence for pre-shield volcanism above the Tristan da Cunha mantle plume

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Wolfram H. Geissler ◽  
Paul Wintersteller ◽  
Marcia Maia ◽  
Anne Strack ◽  
Janina Kammann ◽  
...  
Keyword(s):  
Hot Spot ◽  
Habitat Mapping ◽  
Gis Analysis ◽  
Submarine Eruption ◽  
Core Complex ◽  
Mapping Algorithms ◽  
Walvis Ridge ◽  
Tristan Da Cunha ◽  
Magma Supply ◽  
Mid Atlantic Ridge

Abstract Tristan da Cunha is assumed to be the youngest subaerial expression of the Walvis Ridge hot spot. Based on new hydroacoustic data, we propose that the most recent hot spot volcanic activity occurs west of the island. We surveyed relatively young intraplate volcanic fields and scattered, probably monogenetic, submarine volcanoes with multibeam echosounders and sub-bottom profilers. Structural and zonal GIS analysis of bathymetric and backscatter results, based on habitat mapping algorithms to discriminate seafloor features, revealed numerous previously-unknown volcanic structures. South of Tristan da Cunha, we discovered two large seamounts. One of them, Isolde Seamount, is most likely the source of a 2004 submarine eruption known from a pumice stranding event and seismological analysis. An oceanic core complex, identified at the intersection of the Tristan da Cunha Transform and Fracture Zone System with the Mid-Atlantic Ridge, might indicate reduced magma supply and, therefore, weak plume-ridge interaction at present times.

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