What Is Magnetic Striping Evidence Of?

Where does magnetic striping occur?

At spreading centres, this crust is separated into parallel bands of rock by successive waves of emergent magma.

When Earth’s geomagnetic field undergoes a reversal, the change in polarity is recorded in the magma, which contributes to the alternating pattern of magnetic striping on the seafloor..

Where are magnetic stripes found?

At the mid-ocean ridge spreading axis, these flips in the direction of the Earth’s magnetic field are recorded in the magnetization of the lava. This creates a symmetrical pattern of magnetic stripes of opposite polarity on either side of mid-ocean ridges.

Who discovered magnetic striping?

Vine and Matthews noticed there was a symmetrical pattern of magnetic stripes on either side of the mid ocean ridges. In addition when the basalts of the sea floor were dated, they were found to be the same age at similar distances away from the ridge on each side.

Where is the youngest material in the seafloor found?

The youngest crust of the ocean floor can be found near the seafloor spreading centers or mid-ocean ridges. As the plates split apart, magma rises from below the Earth’s surface to fill in the empty void.

What is magnetic striping?

Magnetic striping – Magnetic minerals are found in rocks. … But once the magma solidifies, the minerals are locked into place and as such can record the reversals of Earth’s magnetic field. The result of this is stripes of magnetic minerals that parallel the mid-ocean ridges.

How do magnetic stripes on the ocean floor serve as evidence for seafloor spreading?

How do strips of magnetized rock on the ocean floor provide evidence of sea-floor spreading? Strips of ocean-floor basalt record the polarity of Earth’s magnetic field at the time the rock formed. These strips form a pattern that is the same on both sides of the mid-ocean ridge.

What is the difference between mid ocean ridges and trenches?

Explanation: Mid-ocean ridges are areas of rifting where two tectonic plates are diverging from one another. … Deep-ocean trenches are formed at convergent plate boundaries where the more dense plate (usually the oceanic) subducts under the less dense (usually continental).

What is magnetic stripes on the seafloor?

Magnetic Stripes. Scientists discovered that the rock that makes up the ocean floor lies in a pattern of magnetized “stripes.” These stripes hold a record of reversals in Earth’s magnetic field. The rock of the ocean floor contains iron. The rock began as molten material that cooled and hardened.

What causes magnetic striping?

The striped magnetic pattern develops because, as oceanic crust pulls apart, magma rises to the surface at mid-ocean ridges and spills out to create new bands of ocean floor. … Later, after the planet’s magnetic field flips again, the next stripe of new ocean floor aligns its polarity in the opposite direction.

How often do magnetic reversals occur?

‘ Reversals are the rule, not the exception. Earth has settled in the last 20 million years into a pattern of a pole reversal about every 200,000 to 300,000 years, although it has been more than twice that long since the last reversal.

What explains the age and magnetic patterns of sea floor rocks?

When scientists studied the magnetic properties of the seafloor, they discovered normal and reversed magnetic stripes with different widths. These magnetic patterns are parallel to the mid-ocean ridges and symmetrical on both sides. … This is how scientists determine the age of the seafloor.

What is the use of a magnetic stripe reader?

A magnetic stripe reader is a device designed to read the information stored within the magnetic stripe of special cards such as credit cards and ATM cards. The magnetic stripe is usually located on the back of the card or badge and contains the account details of the person who owns the card.

What causes paleomagnetism?

Paleomagnetism is possible because some of the minerals that make up rocks—notably magnetite—become permanently magnetized parallel to the earth’s magnetic field at the time of their formation. … When the deposit into which they settle hardens into rock, the magnetization will be fixed.

Can divergent boundaries cause volcanoes?

Most volcanoes form at the boundaries of Earth’s tectonic plates. … The two types of plate boundaries that are most likely to produce volcanic activity are divergent plate boundaries and convergent plate boundaries. Divergent Plate Boundaries. At a divergent boundary, tectonic plates move apart from one another.

What does magnetic striping tell us about the age of rocks?

Magnetic stripes not only tell us about the age of the oceans, they can also reveal the timing and location of initial continental break-up. The oldest oceanic crust that borders a continent must have formed after the continent broke apart initially, and just as sea-floor spreading began.

Where does seafloor spreading occur?

Sea-floor spreading is what happens at the mid-oceanic ridge where a divergent boundary is causing two plates to move away from one another resulting in spreading of the sea floor. As the plates move apart, new material wells up and cools onto the edge of the plates.

How is magnetic striping evidence of plate tectonics?

During times of normal magnetic polarity, the rocks being created stayed normal. … If they were created during times of reverse polarity, the rocks would freeze that magnetic orientation in place.

What are the three types of plate boundaries?

There are three main types of plate boundaries:Convergent boundaries: where two plates are colliding. Subduction zones occur when one or both of the tectonic plates are composed of oceanic crust. … Divergent boundaries – where two plates are moving apart. … Transform boundaries – where plates slide passed each other.