Importance
The importance of shear zones lies in the fact that they are major zones of weakness in the Earth's crust, sometimes extending into the upper mantle. They can be very long-lived features and commonly show evidence of several overprinting stages of activity. Material can be transported upwards or downwards in them, the most important one being water circulating dissolved ions. This can bring about metasomatism in the host rocks and even re-fertilise mantle material.
Shear zones can host economically viable mineralizations, examples being important gold deposits in Precambrian terranes.
Read more about this topic: Shear Zone
Famous quotes containing the word importance:
“People without imagination are beginning to tire of the importance attached to comfort, to culture, to leisure, to all that destroys imagination. This means that people are not really tired of comfort, culture and leisure, but of the use to which they are put, which is precisely what stops us enjoying them.”
—Raoul Vaneigem (b. 1934)
“There is much to be said in favour of modern journalism. By giving us the opinions of the uneducated, it keeps us in touch with the ignorance of the community. By carefully chronicling the current events of contemporary life, it shows us of what very little importance such events really are. By invariably discussing the unnecessary, it makes us understand what things are requisite for culture, and what are not.”
—Oscar Wilde (1854–1900)
“We must continually remind students in the classroom that expression of different opinions and dissenting ideas affirms the intellectual process. We should forcefully explain that our role is not to teach them to think as we do but rather to teach them, by example, the importance of taking a stance that is rooted in rigorous engagement with the full range of ideas about a topic.”
—bell hooks (b. 1955)