Problems dating metamorphic rocks

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They also provided a driving force for crustal deformation, and a new setting for the observations of structural geology.The power of the theory of plate tectonics lies in its ability to combine all of these observations into a single theory of how the lithosphere moves over the convecting mantle.Transform boundaries, such as the San Andreas Fault system, resulted in widespread powerful earthquakes.

In this diagram, subducting slabs are in blue and continental margins and a few plate boundaries are in red.To study all three types of rock, geologists evaluate the minerals of which they are composed.Each mineral has distinct physical properties, and there are many tests to determine each of them.More recently, seismologists have been able to create detailed images of wave speeds inside the earth in the same way a doctor images a body in a CT scan.These images have led to a much more detailed view of the interior of the Earth, and have replaced the simplified layered model with a much more dynamic model.

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