scholarly journals Compositional Continuity and Discontinuity in the Horoman Peridotite, Japan, and its Implication for Melt Extraction Processes in Partially Molten Upper Mantle

2004 ◽  
Vol 45 (2) ◽  
pp. 223-234 ◽  
Author(s):  
M. OBATA
Keyword(s):  
Upper Mantle ◽  
Melt Extraction ◽  
Extraction Processes ◽  
Continuity And Discontinuity

scholarly journals Basalt derived from highly refractory mantle sources during early Izu-Bonin-Mariana arc development

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
He Li ◽  
Richard J. Arculus ◽  
Osamu Ishizuka ◽  
Rosemary Hickey-Vargas ◽  
Gene M. Yogodzinski ◽  
...  
Keyword(s):  
Upper Mantle ◽  
Spinel Peridotite ◽  
Backarc Basin ◽  
Melt Extraction ◽  
Ocean Island Basalts ◽  
Mid Ocean Ridge ◽  
Mantle Sources ◽  
Mariana Arc ◽  
Ocean Ridge ◽  
Aluminous Spinel

AbstractThe magmatic character of early subduction zone and arc development is unlike mature systems. Low-Ti-K tholeiitic basalts and boninites dominate the early Izu-Bonin-Mariana (IBM) system. Basalts recovered from the Amami Sankaku Basin (ASB), underlying and located west of the IBM’s oldest remnant arc, erupted at ~49 Ma. This was 3 million years after subduction inception (51-52 Ma) represented by forearc basalt (FAB), at the tipping point between FAB-boninite and typical arc magmatism. We show ASB basalts are low-Ti-K, aluminous spinel-bearing tholeiites, distinct compared to mid-ocean ridge (MOR), backarc basin, island arc or ocean island basalts. Their upper mantle source was hot, reduced, refractory peridotite, indicating prior melt extraction. ASB basalts transferred rapidly from pressures (~0.7-2 GPa) at the plagioclase-spinel peridotite facies boundary to the surface. Vestiges of a polybaric-polythermal mineralogy are preserved in this basalt, and were not obliterated during persistent recharge-mix-tap-fractionate regimes typical of MOR or mature arcs.

Ancient melt extraction from the oceanic upper mantle revealed by Re–Os isotopes in abyssal peridotites from the Mid-Atlantic ridge

2006 ◽  
Vol 244 (3-4) ◽  
pp. 606-621 ◽  
Author(s):  
Jason Harvey ◽  
Abdelmouhcine Gannoun ◽  
Kevin W. Burton ◽  
Nick W. Rogers ◽  
Olivier Alard ◽  
...  
Keyword(s):  
Upper Mantle ◽  
Melt Extraction ◽  
Os Isotopes ◽  
Mid Atlantic Ridge

Physics of melt extraction: theory, implications and applications

1993 ◽  
Vol 342 (1663) ◽  
pp. 23-41 ◽  
Keyword(s):  
Two Phase Flow ◽  
Small Scale ◽  
Phase Flow ◽  
Two Phase ◽  
Melt Extraction ◽  
Deformable Porous Media ◽  
Ocean Ridges ◽  
Matrix Deformation ◽  
Extraction Processes ◽  
Magma Migration

This paper presents a general overview of flow in deformable porous media with emphasis on melt extraction processes beneath mid-ocean ridges. Using a series of simple model problems, we show that the equations governing magma migration have two fundamentally different modes of behaviour. Compressible two-phase flow governs the separation of melt from the solid and forms a nonlinear wave equation that allows melt to propagate in solitary waves. Incompressible two-phase flow governs small-scale mantle convection driven by lateral variations in melt content. The behaviour of both compressible and incompressible matrix deformation is demonstrated in the context of mid-ocean ridges to show that both mechanisms may explain the observation of the narrowness of ridge volcanism. These results also suggest that melt extraction is an inherently time dependent process that may account for the timing, volume and chemistry of volcanism.

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