Melt Migration and Depletion-Regeneration Processes in Upper Mantle of Continental and Ocean Rift Zones

1991 ◽  
pp. 125-146 ◽  
Author(s):  
N. L. Dobretsov ◽  
I. V. Ashchepkov
Keyword(s):  
Upper Mantle ◽  
Melt Migration ◽  
Rift Zones ◽  
Regeneration Processes

scholarly journals Melt movement through the Icelandic crust

2019 ◽  
Vol 377 (2139) ◽  
pp. 20180010 ◽  
Author(s):  
Robert S. White ◽  
Marie Edmonds ◽  
John Maclennan ◽  
Tim Greenfield ◽  
Thorbjorg Agustsdottir
Keyword(s):  
Carbon Dioxide ◽  
Time Scales ◽  
Upper Mantle ◽  
High Strain ◽  
Strain Rates ◽  
Complementary Information ◽  
Reservoir Architecture ◽  
Rift Zones ◽  
Shallow Crust ◽  
Basaltic Melts

We use both seismology and geobarometry to investigate the movement of melt through the volcanic crust of Iceland. We have captured melt in the act of moving within or through a series of sills ranging from the upper mantle to the shallow crust by the clusters of small earthquakes it produces as it forces its way upward. The melt is injected not just beneath the central volcanoes, but also at discrete locations along the rift zones and above the centre of the underlying mantle plume. We suggest that the high strain rates required to produce seismicity at depths of 10–25 km in a normally ductile part of the Icelandic crust are linked to the exsolution of carbon dioxide from the basaltic melts. The seismicity and geobarometry provide complementary information on the way that the melt moves through the crust, stalling and fractionating, and often freezing in one or more melt lenses on its way upwards: the seismicity shows what is happening instantaneously today, while the geobarometry gives constraints averaged over longer time scales on the depths of residence in the crust of melts prior to their eruption. This article is part of the Theo Murphy meeting issue ‘Magma reservoir architecture and dynamics'.

Distribution of trace elements in crystalline rocks of rift zones

1971 ◽  
Vol 268 (1192) ◽  
pp. 487-491 ◽  
Keyword(s):  
Trace Elements ◽  
Indian Ocean ◽  
Upper Mantle ◽  
Crystalline Rocks ◽  
Similar Data ◽  
Preliminary Conclusion ◽  
The Earth ◽  
Rift Zones ◽  
Ocean Ridge ◽  
Distribution Of Trace Elements

More than 1000 precise analyses of trace elements in basic and ultrabasic rocks of the Mid-Indian Ocean Ridge have been used for geochemical comparison with similar data for the continents, islands and chondrites. We can draw a preliminary conclusion that the transport of trace elements in the oceanic segment of the Earth was controlled by two main processes: ( a ) degassing of the mantle, and ( b ) primary formation of the oceanic upper mantle and crust. Results of both processes may jointly occur.

Melt migration in the upper mantle along the Romanche Fracture Zone (Equatorial Atlantic)

Lithos ◽  
2002 ◽  
Vol 63 (3-4) ◽  
pp. 125-149 ◽  
Author(s):  
Paola Tartarotti ◽  
Sara Susini ◽  
Paolo Nimis ◽  
Luisa Ottolini
Keyword(s):  
Fracture Zone ◽  
Upper Mantle ◽  
Equatorial Atlantic ◽  
Melt Migration ◽  
Romanche Fracture Zone

Geochemical evidence for melt migration and reaction in the upper mantle

Nature ◽  
1992 ◽  
Vol 359 (6390) ◽  
pp. 55-58 ◽  
Author(s):  
E. Takazawa ◽  
F. A. Frey ◽  
N. Shimizu ◽  
M. Obata ◽  
J. L. Bodinier
Keyword(s):  
Upper Mantle ◽  
Geochemical Evidence ◽  
Melt Migration

Strain localization associated with channelized melt migration in upper mantle lithosphere: Insights from the Twin Sisters ultramafic complex, Washington, USA

2013 ◽  
Vol 50 ◽  
pp. 133-147 ◽  
Author(s):  
Seth C. Kruckenberg ◽  
Basil Tikoff ◽  
Virginia G. Toy ◽  
Julie Newman ◽  
Laura I. Young
Keyword(s):  
Strain Localization ◽  
Upper Mantle ◽  
Mantle Lithosphere ◽  
Melt Migration ◽  
Ultramafic Complex

Melt migration and melt-rock reactions in the deforming Earth’s upper mantle: Experiments at high pressure and temperature

Geology ◽  
2014 ◽  
Vol 42 (1) ◽  
pp. 83-86 ◽  
Author(s):  
Vincent Soustelle ◽  
Nicolas P. Walte ◽  
M.A. Geeth M. Manthilake ◽  
Daniel J. Frost
Keyword(s):  
High Pressure ◽  
Upper Mantle ◽  
High Pressure And Temperature ◽  
Melt Migration
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