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 ?
Below these layers a 4-5 km wide highly sheared granite layer mixed with quartz breccias, ferruginous breccias, schroll, and mylonitic rocks (with assumed density 2270 kg/[m.sup.3]) is identified as the surface extension of the SPSZ.
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.
Using the current known gold resource of 5.6 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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