Q1: Compare AND contrast the global tectonic events of the more mod...

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Q1: Compare AND contrast the global tectonic events of the more modern Cenozoic Era with the ancient Proterozoic Eon. Use examples from Laurentia (North America) to elaborate on which types of plate boundaries are and were present, and how we know this.

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Q1: Compare AND contrast the global tectonic events of the more modern Cenozoic Era with the ancient Proterozoic Eon. Use examples from Laurentia (North America) to elaborate on which types of plate boundaries are and were present, and how we know this.

Ans.
The literal meaning of Greek word Proterozoic is ‘earlier life’. This geological period depicts the story of major tectonic changes occurred in the geological past and break up and joining of super continents . This is considered as one of the most active tectonic period in the geological history of earth.

The age of the Proterozoic Eon under the Geological Time Scale extended from 2500 to 541 million years ago. The Eon is further divided into 3 Eras- Palaeoproterozoic Era (2.5 to 1.6 billion years ago), Mesoproterozoic Era (1.6 to 1 billion years ago) and Neoproterozoic Era ( 1 billion to 542.0 million years ago )

The global tectonic event of Proterozoic marked the beginning with the tectonic zonation of earth’s surface into sedimentary basins of platforms and geosynclinals types . the later is represented by vast thickness of sedimentary and volcanic rocks that were deposited in shallow marine conditions.

At about 2.5 billion years ago, less mobile and more rigid blocks of continents (Cratons) coalesced into a larger supercontinent . During the period from 2.4 to 2.2 billion years ago , as a result of doleritic intrusion , the super continent were disintegrated and break up of supercontinent took place.

These broken fragments were again joined between 2.1 to 1.8 billion years ago through the process of collision tectonics , as a result of which a new super...

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