Basalto das dorsais oceânicas

Multi tool use
Basalto das dorsais oceânicas, conhecido por MORB, um acrónimo, formado a partir da expressão inglesa Middle Ocean Ridge Basalt, é a designação dada em petrologia aos basaltos toleíticos formados por extrusão de magma ao longo dos rifts das cadeias meso-oceânicas. Aquele basalto, geralmente simplesmente designado por MORB, caracteriza-se por teores anormalmente baixos de K2O e de TiO2, baixos teores de Fe, P, Ba, Rb, Sr, Pb, Th, U e Zr, alto teor de CaO e baixa razão das concentrações das terras raras (ETR) leves e pesadas. Estas características reflectem as condições de formação daquela rocha a partir do manto astenosférico a pequena profundidade na presença de um forte gradiente geotérmico e baixas pressões.[1]

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Notas
↑ MORB (Middle Ocean Ridge Basalt) .
Ligações externas |
- Basaltos das cadeias meso-oceânicas
- MORB and Sea-floor Spreading
Tipos de basaltos |
Basaltos por enquadramento tectónico |
Basaltos dos trapp · Basaltos das dorsais oceânicas · Basaltos das ilhas oceânicas · Basaltos dos arcos vulcânicos
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Basaltos por forma |
Basalto colunar · Basalto pillow · Lava Aa · Lava pahoehoe
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Basaltos por composição química |
Basalto alcalino · Basalto toleítico · Havaíto · Mugearito · Basalto picrítico
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Principais minerais |
Anfíbolas · Cristobalite · Olivina · Piroxenas · Plagioclases · Tridimite
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