Types of dating rocks who was robert kardashian jr dating
Metamorphic rocks are those that form by the effects of heat, pressure, and shear upon igneous and sedimentary rocks.Some form during mountain-building by forces of others from the heat of igneous intrusions in Amphibolite forms when basaltic rock is subjected to higher temperatures between 550 C and 750 C) and slightly greater pressure range than that which yields greenschist.
Eclogite ("ECK-lo-jite") is an extreme metamorphic rock formed by regional metamorphism of basalt under very high pressures and temperatures.
The American Indians favored it for tobacco pipes and other small ceremonial or decorative objects.
High-pressure, low-temperature conditions are most typical of subduction, where marine crust and sediments are carried beneath a continental plate and kneaded by changing tectonic motions while sodium-rich fluids marinate the rocks.
Blueschist is a schist because all traces of original structure in the rock have been wiped out along with the original minerals, and a strongly layered fabric has been imposed.
The bluest, most schistose blueschist—like this example— is made from sodium-rich mafic rocks like basalt and gabbro.