Have you heard of the man? Barry Setterfield? He published this back in 2002.
[www.setterfield.org] Maybe you have, and I just missed it.
One More Global Catastrophe and Abraham
"As the effects of the ice-age began to taper off, another global event assisted that process. This event changed the earth's axis tilt from more than 28 degrees, back to the present 23.5 degrees. This event, too, may have been an asteroid or comet impact, though other viable mechanisms have been discussed . Whatever the cause, the improved climatic conditions allowed the eventual re-establishment of major cultures. Studies of this event by the late Government Astronomer for South Australia, George Dodwell , and USA researcher M. M. Mandelkehr  lead to the conclusion that the date was close to 2345 BC, with climatic, archaeological, and geological changes occurring globally. At this same time, the movement of the earth's virtual geomagnetic pole position showed a sudden change in direction, which was also an indication that an important global event happened then . Although the matter is still open for discussion, it appears that this event may well have marked the close of the 5th Dynasty in Egypt, at least according to some likely chronologies .
This brings us down to the less turbulent days of Abraham, who lived from 2304 to 2129 BC on the chronology adopted here. An archaeologist, Prof. D. N. Freedman of the University of Michigan made some important comments on this matter. As a result of the discovery of the Ebla tablets, written during the 23rd century BC, he commented: "It is now my belief that the story [about Abraham] in Genesis 14 not only corresponds in content to the Ebla Tablet, but that the Genesis account derives from the same period. Briefly put, the account in Genesis 14, and also in Chapters 18-19, does not belong to the second millennium BC, still less to the first millennium BC, but rather to the third millennium BC" . This evidence thus lends credibility to the dating for Abraham adopted here, as does the chronology accepted by the Church Fathers as outlined by Theophilus of Antioch . This, then, would indicate that Abraham's visit to Egypt occurred around 2229 BC, which was in the reign of Pharaoh Pepy II, if some recent studies are accepted . By this time, the sequence of global catastrophes was over, although we have records of continuing local catastrophes over the time since then."
Also very interesting.