Questions tagged [paleomagnetism]
The paleomagnetism tag has no usage guidance.
15
questions
0
votes
0answers
43 views
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 ...
1
vote
0answers
43 views
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 ...
7
votes
2answers
234 views
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 ...
5
votes
1answer
214 views
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 ...
13
votes
3answers
2k views
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 ...
13
votes
2answers
3k views
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 ...
1
vote
0answers
62 views
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 ...
4
votes
1answer
179 views
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 ...
6
votes
1answer
207 views
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 ...
6
votes
2answers
111 views
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 ...
23
votes
0answers
353 views
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 ...
3
votes
1answer
560 views
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 ...
9
votes
2answers
378 views
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 ...
20
votes
1answer
347 views
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 ...
17
votes
2answers
1k views
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 ...
