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Intrusions of the igneous rock are younger or older than the rock layers beneath and surrounding them?
Wiki User
∙ 13y ago
they are younger and extrusions are older. they are younger because the surrounding rock layers had to have been there first in order for it to appear. :)
Wiki User
∙ 13y ago
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Why is an igneous intrusion younger than the rocks in which it is found?
The melted rock of the igneous intrusion pushed its way into cracks and made previously existing rock weaker. The intrusions only became rock when they cooled and solidified, therefore they are younger than the rocks in which they are embedded.
When there is an igneous intrusion and a fault line which one is younger?
That depends! If the fault line cross cuts the igneous intrusion causing the intrusion to be displaced on either side of the fault and forming a broken mass of rock within the intrusion known as a fault breccia then the fault is younger than the intrusions, as the intrusion must have already existed for the fault to cause it's displacement. If on the other hand the igneous intrusion cross cuts the fault and is un-deformed then it is probable that it is younger than the fault.
If a dike is present within a rock outcrop what is its age relationship with the other rock layers?
Any igneous dike or intrusion is younger that the surrounding rock layers.
What term denotes blocks of older rock enclosed in a body of younger igneous rock?
Xenolith
How do you know that an intrusion is younger than its surrounding rock layers?
younger over older is a phrase you can use to remember this principle.
Which law tells us that igneous intrusions are younger than the strata they are in?
The Law Of Cross Cutting
How do you figure out how old rocks are by using their positions compared to each other?
With sedimentary rocks, young ones are usually on top of older ones. Where igneous rocks intrude into others, the intrusions must be younger than the surrounding rocks.
Why is an igneous intrusion younger than the rocks in which it is found?
The melted rock of the igneous intrusion pushed its way into cracks and made previously existing rock weaker. The intrusions only became rock when they cooled and solidified, therefore they are younger than the rocks in which they are embedded.
When there is an igneous intrusion and a fault line which one is younger?
That depends! If the fault line cross cuts the igneous intrusion causing the intrusion to be displaced on either side of the fault and forming a broken mass of rock within the intrusion known as a fault breccia then the fault is younger than the intrusions, as the intrusion must have already existed for the fault to cause it's displacement. If on the other hand the igneous intrusion cross cuts the fault and is un-deformed then it is probable that it is younger than the fault.
If a dike is present within a rock outcrop what is its age relationship with the other rock layers?
Any igneous dike or intrusion is younger that the surrounding rock layers.
How does the age of an igneous extrusion compare with the rock into which it was extruded?
An igneous intrusion is younger than the rock into which it intruded.
An igneous body younger than the rocks above and below?
sill
Suppose a lava flow was found between two sedimentary rock layers How could you use the lava flow to learn about the ages of the sedimentary rock layers?
Because of geologic events such as plate tectonics and volcanism, suitable material for radiometric dating, such as volcanic tuff, solidified lava, and igneous intrusions have been found as layers on, in, and cut through layers of sedimentary rock.Intrusions are always younger than the rock body they penetrate, meaning that the sedimentary rock in which intrusions are found will be older than a radiometrically dated sample of the intrusion. Lava flows and volcanic ash which form layers in rock will be younger than the rock below and older than the rock above. The solidified intrusions and lava flows can be dated with radiometric techniques.The radiometric dating of suitable rocks (i.e. igneous or metamorphic) in proximity to their sedimentary counterparts, therefore allows the sedimentary rock to be dated as well.
What is a igneous extrusion?
Lava that hardens on the surface, and are younger than the rock layers below.
What processes might put younger rock beneath older rock?
the answer is cool
What is the age of an igneous intrusion in relation to the sedimentary rock layers it passes through?
It is younger than them.
What is the age of an intrusion of igneous rock in relation to the sedimentary rock layers through which it passed?
It is younger.
