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View Full Version : Impact crater in South Giorgia Island?



rafaelg
2012-Aug-09, 11:27 PM
Hi
In goole earth, at North of South Giorgia Island (5241'26.36"S, 37 2'2.05"O)
In the seabed is an oval footprint of about 600 km by 450 km with a peak in the Centre.
It resembles an impact crater, would be one of the great surviving, but not found anything published.
Watch in goole earth, maybe it may be of interest.
Rafael

dgavin
2012-Aug-10, 02:28 PM
I suspect what you have there isn't an impact crater, but is likely a similar formation to thet great eliptical basin (see http://cosmoquest.org/forum/showthread.php/125624-Great-Eliptical-Basin-micro-quakes).

It's about 1/3 the size of the GEB, and less elongated, but basiclay it's a breakout out area for a hostspot, that was formed by dixtial tortion in the upper mantle, as opposed to a mantle plume from the core. Basicaly they are like a version of jupiters red spot, that happen in rock, instead of land. And are caused by the rock on either side of the are moving in somewhat opposite directions.

It also appears that it likely formed around the same time as the scotia plate fromed about 50million years ago, probably from similar stresses. As the Scotia plate broke South America and Antartica apart, and continuted to elongate west, that tectonic processes lifted the sothern part of the basin's garben (outer ring) abover the sea formign the large island of south georgia. These mountains are very similar to the Himalaya's.