Reconstruction Examples

Whenever a reconstruction has been made it is important to note that EasyGmap automatically generates a so-called ‘Animation file’ that contains all the information for a specific reconstruction.  We have, therefore, included some ‘Animation’ options which allow the operator to check which continents are included in a reconstruction, inspect Euler rotation parameters and change them if necessary.

 

 Example 1: Relative reconstruction using magnetic anomaly fits at 50 Ma

 

Set Projection to Equal area (Schmidt) and change projection centre to 90 (polar projection)   

In EasyGmap controller make sure that reconstruction mode is set to Relative Fit

Type ‘50’ in the EasyGmap age box and click on Reconstruct

 

This would produce a relative reconstruction based on magnetic anomaly fits (interpolated between real input values).  In this reconstruction, North America is kept fixed, but in Set you also have the option to keep Europe fixed.

 

 

 

 

 

 

 

 

 

Example 2: Hotspot and magnetic anomaly fits at 50 Ma

 

 

Set Projection to Equal area (Schmidt) and change projection centre to 90 (polar projection)

In EasyGmap controller make sure that reconstruction mode is set to Hotspot Frame

Type ‘50’ in the EasyGmap age box and click on Reconstruct

 

 

This would produce a figure similar to the example above, but apart from the same relative fits, all the land-masses have now been placed in ‘correct’ latitude and longitude.

 

 

 

 

 

 

 

Example 3: Palaeomagnetic reconstruction at 170 Ma

 

Set Projection to Equal area (Schmidt)

In EasyGmap controller make sure that reconstruction mode is set to Palaeomagnetic Frame

Type ‘170’ in the EasyGmap age box and click on Reconstruct

 

 

Continents will be placed at ‘correct’ latitudes but palaeolongitude is not constrained  

 

 

 

 

 

 

 

 

Example 4: Hotspot and magnetic anomaly fits at 70 Ma with plate velocity vectors

 

Set Projection to Equal area (Schmidt) and change projection centre to 90 (polar projection)

In EasyGmap controller make sure that reconstruction mode is set to Hotspot Frame and click on Plate vectors

Type ‘70’ in the EasyGmap age box and click on Reconstruct

 

 

This produces a hotspot reconstruction with plate velocity directions.  Vectord in this example are scaled.