continental crust


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continental crust

[¦känt·ən¦ent·əl ′krəst]
(geology)
The basement complex of rock, that is, metamorphosed sedimentary and volcanic rock with associated igneous rocks mainly granitic, that underlies the continents and the continental shelves.
References in periodicals archive ?
However, as the continental crust changed to become more silica-rich like today's, the olivine content reduced, and so did the chemical reactions that locked away free oxygen.
Exactly when is model-dependent, but what is clear is that the formation of continental crust naturally leads to two rises in atmospheric oxygen, just as we see in the fossil record," Lee said.
Illustration of the proposed position of the detached continental crust below IMR.
This dichotomy arose because ocean crust (made mostly of volcanic basalt) is denser yet thinner than continental crust (made primarily of granite).
The team used the argon isotope ratio to estimate how the continents have grown over geological time and found that the volume of continental crust 3.
5 billion years, and the identification of zones of attenuated continental crust.
Gravity modeling indicates a thinned continental crust underneath the Sarawak shelf and slope and supports the seismic and well data interpretation.
As Peter Friend explains, today's Scotland is the result of at least five continental crust fragments bumping into one another during a far-distant era of tectonic mayhem.
As eastern Africa keeps stretching, though, its continental crust gets thinner and thinner.
Rare earth elements (REE) have become important geochemical tracers in order to understand and describe the chemical evolution of the earth's continental crust [11-14].

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