Table 3.

The densities and velocities used in 2D forward gravity modelling

Rock typeVelocity (km s−1)Density (cgs)
Continental crust
1. Upper continental crust (UCC)5.72.7
2. Middle continental crust (MCC)6.22.85
3. Lower continental crust (LCC)6.63.0
Oceanic crust
1. Oceanic crust (average)6.2–6.32.85–2.9
2. Mantle8.03.3–3.35
Serpentinized mantle7.02.9–3.05
Water1.51.03
Sedimentary rocks
1. Layer 12.02.2
2. Layer 22.1–2.22.35–2.4
3. Layer 32.5–2.62.5
4. Older sediments3.2–4.52.55
85° E Ridge
1. Volcanic plug6.2–6.32.7–2.9
2. Out-poured rocks4.5–5.72.5–2.7