Read this Buzzle article to gain extensive information about the main features of these rocks.The Acasta gneiss complex is a part of the Canadian Shield, and is one of the oldest rocks on the planet.Note from a Teacher: I am a veteran teacher of 24 years who teaches in a dual language program.This is my 2nd year teaching Science and I'm not satisfied with the way it has been going. I have always been a hands-on interactive teacher, but because of my added responsibilities at school, I absolutely have no time to hunt anything down! Just having a compilation of the different topics will make everything so much easier.has a Greek origin, and has been derived from 'meta', meaning change and 'morph', meaning form.Metamorphic rocks are formed mainly due to changes in pressure and temperature, thereby, transforming the original/parent igneous and/or sedimentary rocks.By about 550 million years ago, Pannotia was breaking up into several small fragments, Laurentia (the core of what is now North America), Baltica (northern Europe), and Siberia, among others, and one very large piece.This large piece, containing what would become China, India, Africa, South America, and Antarctica, was called Gondwana.
This age was calculated by dating the residual zircons found in this gneiss metamorphic rock, which is also one of the oldest mineral fragments in the world.
One of the oldest types of rocks on our planet, metamorphic rocks are mainly formed due to changes in the parameters of temperature and pressure, which act on the parent material.
Their study provides us with important data regarding formation of the Earth and the past geological environment.
It is considered a supercontinent in its own right because it is so big, but it is only part of the earlier supercontinents.
Over the next 200 million years many of the small pieces came together to form another large continent called Laurasia.