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How did the Grenville Orogeny help form Rodinia?
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paleogeography
Watch a time-lapse of Earth changing through geologic time, from the Cambrian Era to the projected period of Pangea Proxima.
The Grenville Orogeny was a critical mountain-building event that occurred between approximately 1.3 billion and 1 billion years ago, serving as a primary mechanism for the assembly of the supercontinent Rodinia.12
During this period, the collision between the craton of Laurentia (comprising present-day North America and Greenland) and other unidentified continents resulted in intense tectonic activity. Key aspects of this process include:12
- Crustal Thickening: Between about 1.15 and 1.05 billion years ago, significant crustal-scale thrusting occurred along the southeastern margin of the Canadian Shield. This process effectively doubled the thickness of the crust and pushed up massive mountain ranges.2
- Accretion: The orogenic belt incorporated slices of crust that had formed offshore between 1.5 and 1.3 billion years ago, welding them onto the existing continental mass.2
- Global Context: The Grenville Orogeny is part of a broader, contemporaneous system of mountain-building events occurring globally, which collectively record the convergence and amalgamation of landmasses into the Rodinia supercontinent.12
This event is one of the most well-studied examples of the tectonic forces that brought Earth's landmasses together during the Proterozoic Eon.1