Questions tagged [paleomagnetism]

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Can paleomagnetic techniques determine the exact direction of Earth's magnetic poles in the past, not just their polarity?

Since our planet's magnetic poles are not usually, precisely, lined up with the geographic poles of Earth's axis, and since they move around a lot, can paleomagneticists (is that a word?) determine ...
Kurt Hikes's user avatar
2 votes
1 answer

How accurate are paleomagnetic orientation measurements?

I am curious what the modern accuracy for paleomagnetic azimuthal orientation measurements are. Let's say for a magnetite grain, is the orientation of the magnetic moment for a single crystal resolved ...
thehungrygraduate's user avatar
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More iron = Less remanent magnetic field

I am aware that iron is a magnetic mineral and through the process of thermoremanent magnetization it can store a record to the state of magnetization it formed in. I wanted to ask if there are any ...
Ahmed Abdulla's user avatar
2 votes
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What is the relative (magnetic) permeability of the Earth? How could it be measured?

I believe, Earth could be approximated by a molten, metallic, non-magnetic sphere, with a molten stony sphere around it. However, As far I know, the magnetic properties of the lava in the crust, in ...
peterh's user avatar
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7 votes
2 answers

Is there evidence of multiple poles (higher order than dipole) in earth's magnetic field?

There is this slightly uncombed simulation model of a geomagnetic field reversal, showing multiple poles, a quadrupole or even higher order magnetic field. Earth's magnetic field is mostly described ...
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6 votes
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What happens when the North and South poles flip?

How long does it take the magnetic field to move once the poles start to flip? What environmentally would change? Does the core of the Earth flip? The magnetic poles are moving now. When will it start ...
Muze's user avatar
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14 votes
3 answers

Does the magnetic field really protect Earth from anything?

Many topics discussed here in Earth Science SE, tend to be about facts that are of consensus in the scientific community but not widely accepted by the general public. Instead, this one is widely ...
Camilo Rada's user avatar
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13 votes
2 answers

How long does a magnetic pole reversal take to complete?

Geomagnetic pole reversal is a "regular" phenomenon on Earth. Although the interval pattern has been irregular at times (sometimes with millions of years of difference between change intervals), Earth ...
theforestecologist's user avatar
1 vote
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Is it possible that a change of the earth magnetic poles influences deep-sea currents?

A deepwater circulation had changed direction about 55 million years ago, whereby salt cold water went from north to south. This was seen after research of foraminifera with carbon isotope change. But ...
Marijn 's user avatar
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4 votes
1 answer

Are the magnetic elements of meteorites that have struck Earth aligned with the magnetic field?

I was just pondering this question; do meteorites containing significant magnetic metal elements displace paleomagnetism the same way that magnetic striping on the ocean floor occurs? When the ...
Sam's user avatar
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6 votes
1 answer

How did the intensity of Earth's magnetic field change through geological time?

Looking at the wikipedia article on the Earth's magnetic field, I see that its strength varies through time. How did Earth's magnetic field change throughout its history, from the beginning of the ...
Remi.b's user avatar
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6 votes
2 answers

Could the magnetic field influence tectonic forces

Paleomagnetism can be measured as the magnetic field at the time of rock forming is preserved in some minerals. Could the paleomagnetism and the present magnetic field somehow influence the movements ...
Mart's user avatar
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24 votes
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How reliable were early measurements of palaeomagnetic directions?

The methodology and equipment for palaeomagnetic studies in the 1960s and 1970s was often rather primitive by today's standards. For example, Doell and Cox (1967) imply that the standard procedure for ...
Pont's user avatar
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3 votes
1 answer

Help determining virtual geomagnetic pole

Magnetic measurements have been made on some lavas found at 60ºN and 90ºW. The inclination angle is 37º. If the horizontal direction of magnetism of these lavas is due west, calculate the position of ...
rob's user avatar
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9 votes
2 answers

How are paleomagnetic polarities determined?

In magnetostratigraphic logs various chrons are distinguished with either normal or reversed polarity, with the magnetic north pole at the geographic north and south pole, respectively. How and why ...
hugovdberg's user avatar
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20 votes
1 answer

Why Earth's magnetic poles are (and were) in their positions?

This is a sort of a follow-up question to What causes the Earth to have magnetic poles? The Earth has magnetic fields, and according to dynamo theory I roughly understand why. If the Earth's rotation ...
Pavel V.'s user avatar
  • 976
17 votes
2 answers

What causes the Earth to have magnetic poles?

A compass can tell me the directions of the Earth's North and South poles? What is it about the Earth that produces this "polarity" such that a compass can pick it up? The first thing that jumped ...
Kenshin's user avatar
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