OCEAN CRUST FORMATION

 

(Press & Siever)

- HOT MUSH OF BASALTIC CRYSTALS (85%) AND MELT (15%) RISES

- MELT CONCENTRATED IN MAGMA LENS (yellow)

- MAGMA DIKES ERUPT TO FORM SEAFLOOR PILLOW LAVAS AND UNDERLYING SHEETED DIKES

- THIN LAYER OF OCEANIC SEDIMENT STARTS TO COVER NEW CRUST

- MUSH COOLS TO FORM LOWER LAYERS OF GABBROIC OCEANIC CRUST AS PLATES SPREAD APART