Granite Layer

Granite Layer

 

(granite-gneiss or metamorphic granite layer), the conventional name for a layer of the earth in which longitudinal seismic waves travel at a velocity of 5.0–6.5 km/sec. On continents, the layer is covered by a sedimentary mantle, with the exception of the shields where the layer is exposed; the layer is typically absent on the ocean floor. In addition to granites, the layer includes gneisses and other metamorphic and igneous rocks.

E. N. LIUSTIKH

References in periodicals archive ?
The impact appears to have sheared or destroyed much of the 30-mile-thick granite layer in the western coast of India.
The problem for Danny was the granite layer protecting Sam's bear-like head.
Another source of geothermal energy is the heat generated by granite layers, especially in the North Pennines.
3 of our set exhibits a distinct layering (Figure 11) and a large scale (regional) sequences of thick sub-horizontal granite layers of different colours can be observed at the high levels of the mountains.
6 million ounces, contained in two granite layers lying 600 feet to nearly 900 feet underground, Pogo's gold would be extracted within 12 years.

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