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.
TABLE OF CONTENTS
ABSTRACT
INTRODUCTION
FIRST CRATONS
PRECAMBRIAN HEAT FLOW
HADEAN EON 4,5 - 3,9 GA
EARTH’S OLDEST ROCKS STUDIES
TTGs Studies
Hadean detrital Zircon 9
HADEAN TECTONIC MODELS
TTGs
Zircon:
ARCHEAN EON 3,9 - 2,5 GA
GENERAL CHARACTERISTICS OF CRATONIC MANTLE LITHOSPHERE
GENERAL GEOLOGY OF ARCHEAN CRATONS
Greenstones
High-grade gneiss terrains
FORMATION OF THE ARCHEAN MANTLE LITHOSPHERE
FORMATION OF THE ARCHEAN CRUST
Dome and Keel Tectonics
ARCHEAN - PROTEROZOIC BOUNDARY
PROTEROZOIC EON 2,5 - 0,6 GA
GENERAL GEOLOGY OF PROTEROZOIC CRATONS
PROTEROZOIC PLATE TECTONICS
SUPERCONTINENTAL CYCLE
LATE ARCHEAN - EARLY PROTEROZOIC SUPERCONTINENTS
LATE PROTEROZOIC SUPERCONTINENTS
SUMMARY
BIBLIOGRAPHY
REFERENCES CITED
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