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Continental crustal composition and lower crustal modelsThe composition of the upper crust is well established as being close to that of granodiorite. The upper crustal composition is reflected in the uniform REE abundances in shales which represent an homogenization of the various REE patterns. This composition can only persist to depths of 10-15 km, for heat flow and geochemical balance reasons. The composition of the total crust is model dependent. One constraint is that it should be capable of generating the upper granodioritic (S.L.) crust by partial melting within the crust. This composition is based on the andesite model, which assumes that the total crust has grown by accretion of island arc material. A representation of the growth rate of the continental crust is shown. The composition of the lower crust, which comprises 60-80% of the continental crust, remains a major unknown factor for models of terrestrial crustal evolution. Two approaches are used to model the lower crust.
Document ID
19840012897
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Taylor, S. R. (Australian National Univ. Canberra, Australia)
Date Acquired
August 11, 2013
Publication Date
January 1, 1983
Publication Information
Publication: Lunar and Planetary Inst. Workshop on a Cross Section of Archean Crust
Subject Category
Geophysics
Accession Number
84N20965
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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