Seminar paper from the year 2016 in the subject Earth Science / Geography – General, Basics, grade: 95%, Ruhr-University of Bochum (Institute of MIneralogy), course: Structural Geology, language: English, abstract: This assignment exhibits the period since Earth has formed until boundary conditions and tectonics started to stabilize. This period is called Precambrian and consists the 7/8 of Earth’s history. Precambrian lasts 3, 9 Ga and is separated into three Eons, Hadean, Archean and Proterozoic with respect to time occurrence.
Earth loses heat through time due to gradually decrease in decay of radiogenic isotopes which are dispersed into the core, mantle and continental crust. Therefore, Earth composition and tectonics distinctly change. Tectonics generally change from vertical patterns to horizontal and the continental crust forms until the end of the Precambrian to the 82% of the overall crust, covering Earth now. Moreover, different movements of Supercontinents which fragmented, dispersed and collided where studied through geological, paleomagnetic and paleoclimatic studies.
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