Considering the jumps of rift zones over Iceland, and seeing the pace of those ‘jumps’, there seems to be a possibility that another rift zone opened before the ‘first one’.
Was there another Rift Axis?
The activity would then have occurred about 25 million years ago, probably at the same time as when the Northwest Rift Axis was active. The prospective rift axis is pointed out with a question mark.
I am a geologist, graduated from the University of Iceland, and taught geology for a few years. I have gained some knowledge about Earth's inner structure, so I provide this website as my contribution to answer one of the greatest questions remaining within the realm of geoscience. Experiments show that the mantle should form convection rolls when close to the melting point. I took this literally, and calculated the dimensions and shape of these mantle convection rolls. Then I compare that model with the surface. This makes it possible to provide many interesting examples about geology found on my blog.
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Magic Magma 