Table of Contents
How do geologists measure strike and dip?
The strike is measured by aligning the compass along a horizontal line on the surface of the feature (Figure 13.36, left). The dip is measured by turning the compass on its side and aligning it along the dip direction (Figure 13.36, right).
What is a geological strike and dip?
Strike refers to the line formed by the intersection of a horizontal plane and an inclined surface. Dip is the angle between that horizontal plane (such as the top of this block) and the tilted surface (the geologic contact between the tilted layers). In Figure 12.8, look at the tilted sedimentary layers.
Why is it necessary to measure the dip angle perpendicular to the strike of the inclined bed?
The dip is the maximum angle of inclination of the plane. Because the dip trend is always perpendicular to the strike only the quadrant direction (NE, SE, NW, SW) is needed for the dip.
What is difference between true dip and apparent dip?
Note: When a vertical cross-section is perpendicular to the strike of the beds, the inclination seen in the cross section is called the true dip. The apparent steepness in the direction of travel is the apparent dip in that direction (the cross-section direction). The hill is of course the geologic bedding plane.
Why is dip a vector quantity?
It is defined as the amount of inclination of a bed with respect to a horizontal plane; measured on a vertical plane lying at right angles to the strike of the bedding. The dip of a bed has got two components, like direction as well as magnitude. So the dip of a bed is a vector quantity.
How will a rock respond if it is subjected to high heat and pressure?
One ways rocks may change during metamorphism is by rearrangement of their mineral crystals. When heat and pressure change the environment of a rock, the crystals may respond by rearranging their structure. They will form new minerals that are more stable in the new environment.