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Oceanic crust is significantly simpler than continental crust and generally can be divided in three layers. [8] According to mineral physics experiments, at lower mantle pressures, oceanic crust becomes denser than the surrounding mantle. [9] Layer 1 is on an average 0.4 km thick.
Oceanic crust differs from continental crust in several ways: it is thinner, denser, younger, and of different chemical composition. Like continental crust, however, oceanic crust is destroyed in subduction zones. The lavas are generally of two types: pillow lavas and sheet flows.
11 Οκτ 1984 · The density structure and average density of the oceanic crust have implications for various geological and geophysical problems, including interpretations of gravity data, the variation of...
14 Ιαν 2019 · Global models that describe the seismic velocity and density structure of the crust play a crucial role for many geophysical applications.
17 Μαΐ 2007 · For instance, the depth-averaged density of the oceanic plate, including a 7-km thick crust (average density ρ c = 2900 kg m −3), at 1500 km from the ridge, is ∼3314 and 3315 kg m −3 for the QL and NL model, respectively.
1 Ιαν 2018 · Oceanic crust formed at MOR is primarily basaltic in composition and thin (~3–10 km thick) compared to continental crust that has an average thickness of 35–40 km and a roughly andesitic composition (Taylor and McLennan 1985; Rudnick 1995).
10 Ιουν 1990 · High density and porosity gradients are characteristic of the upper oceanic crust; increasing densities reflect both a progressive decrease of porosity and increasing grain density with depth.
