Melting Phase Relations of Mantle Peridotite up to 25 GPa: Speculations on the Origin and Evolution of the Earth’s Mantle

1990 ◽  
pp. 253-275 ◽  
Author(s):  
Eiichi Takahashi ◽  
Eiji Ito
Keyword(s):  
Mantle Peridotite ◽  
Phase Relations ◽  
Origin And Evolution ◽  
Earth’S Mantle

Slab-derived sulfate generates oxidized basaltic magmas in the southern Cascade arc (California, USA)

Geology ◽  
2021 ◽  
Author(s):  
Michelle J. Muth ◽  
Paul J. Wallace
Keyword(s):  
Oxidation State ◽  
Mantle Wedge ◽  
Mantle Peridotite ◽  
Mantle Metasomatism ◽  
Cascade Arc ◽  
Earth’S Mantle ◽  
Basaltic Magmas ◽  
Using Data ◽  
First Time ◽  
Arc Magma

Whether and how subduction increases the oxidation state of Earth’s mantle are two of the most important unresolved questions in solid Earth geochemistry. Using data from the southern Cascade arc (California, USA), we show quantitatively for the first time that increases in arc magma oxidation state are fundamentally linked to mass transfer of isotopically heavy sulfate from the subducted plate into the mantle wedge. We investigate multiple hypotheses related to plate dehydration and melting and the rise and reaction of slab melts with mantle peridotite in the wedge, focusing on electron balance between redox-sensitive iron and sulfur during these processes. These results show that unless slab-derived silicic melts contain much higher dissolved sulfur than is indicated by currently available experimental data, arc magma generation by mantle wedge melting must involve multiple stages of mantle metasomatism by slab-derived oxidized and sulfur-bearing hydrous components.

Origin and evolution of the term Psychology: Addenda.

1980 ◽  
Vol 35 (8) ◽  
pp. 774-774 ◽  
Author(s):  
Hendrika Vande Kemp
Keyword(s):  
Origin And Evolution
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