VI. Oceanic Crust

Question 1

Oceanic crust Ophiolite model: Layer 1

Answer 1

Pelagic Sediments

Question 2

Oceanic crust Ophiolite model: Layer 2

Answer 2

2a: Basaltic Pillow lavas
2b: Diabase Sheeted dikes

Question 3

Oceanic crust Ophiolite model: Layer 3

Answer 3

3a: Gabbro
3b: Layered gabbro

Question 4

A boundary between layered gabbro and layered peridotite

Answer 4

Geophysical or seismic moho

Question 5

Boundary between Layered peridotite and upper mantle

Answer 5

Petrologic moho

Question 6

A layer between Geophysical moho and Petrological moho

Answer 6

Ultramafic cumulates or layered peridotite

Question 7

Oceanic crust Ophiolite model: Layer 4

Answer 7

Geophysical moho (boundary)
Layered Peridotite (Ultramafic cumulates)
Petrologic moho (boundary)
Upper mantle

Question 8

In the center of the profile the wide-angle Moho marks the top of a large dense _____, limited from below by upper mantle reflectors at a depth of 65-70 km

Answer 8

eclogitic body in the upper mantle