brasil geologia ecoturismo geoturismo turismo geológico Rodínia brasil geología geoturismo turismo geológico Rodinia brasilien geologie reise reisen urlaub Rodinia

Geological Travel

Rodinia

rodinia
Adventure Tours / Brazil – Rodinia (1,1 - 0,6 Ga) was a Proterozoic supercontinent, which during the Grenville orogenic cycle was formed by fragments (Ur, Nena, Atlântica) of Columbia, the prior supercontinent.

Rodinia seemed to have been a barren, desolate, lifeless place, probaply comparable to modern deserts. Towards the end of its cycle, Rodinias position was blocking the warm equatorial ocean currents, causing the polar regions to freeze.

As temperatures sank to minus 40 degrees Fahrenheit, it is believed that about 700 million years ago, the entire Earth was covered with a sheet of ice, one mile thick. The only life - forms at that time, marine bacterias and algae were driven to extinction.

About 600 Ma, when the heat below the ice, triggered by volcanic activity, accumulated, Rodinia started to rupture and finally broke up. The carbon dioxide released by the eruptions caused a temporary greenhouse effect and the ice sheets drew back.

Rodinia's Ur and Atlantica related fragments reassembled about 550 Ma to Gondwana – Brazil Tours / Geology.