Encyclopedia of Planetary Landforms

2015 Edition
| Editors: Henrik Hargitai, Ákos Kereszturi

Crust (Type)

  • Henrik Hargitai
Reference work entry
DOI: https://doi.org/10.1007/978-1-4614-3134-3_90

Definition

Solidified upper layer of a planetary body that is chemically distinct from the mantle, formed by various degrees of differentiation. On Earth, the crust comprises all material above the Mohorovičić discontinuity (Whittow 2000). The definition of the terrestrial lithosphere (mobile lithospheric plates) includes the crust and the uppermost mantle, both of which are layers of strength relative to the underlying weaker asthenospheric mantle for deformation at geologic rates (Dennis and Atwater 1974, p. 1031; Bürgman and Dresen 2008). On other planetary bodies, the crust is poorly defined because of the lack of seismic data.

Subtypes

  1. (1)

    Primary/primordial crust results from planetary differentiation. It forms during and following planetary accretion (Chambers 2004) on short (100 Myr) timescales (Taylor 1989; Taylor and McLennan 2009, p. 22 and references therein). When the surface had stabilized subsequent to primary accretion, it became cool and thus strong and rigid enough...

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Copyright information

© Springer Science+Business Media New York 2015

Authors and Affiliations

  1. 1.NASA Ames Research Center/NPPMoffett FieldUSA