The concept of “first orogeny” is complex, as orogenies, which are periods of mountain-building events, have occurred multiple times throughout Earth’s geological history. Orogenies are typically caused by tectonic forces, such as the collision of tectonic plates, and result in the uplift and deformation of the Earth’s crust, leading to the formation of mountain ranges.
The earliest orogenies on Earth likely occurred billions of years ago during the early stages of the planet’s formation. However, the geological record of these early orogenies has been significantly altered due to the processes of erosion, weathering, and plate tectonics over billions of years, making it challenging to accurately determine their timing and characteristics.
One of the most well-known and significant orogenies in Earth’s history is the Grenville orogeny, which occurred during the Proterozoic Eon, around 1.3 to 1.0 billion years ago. The Grenville orogeny is believed to have involved the collision of multiple continents, leading to the formation of a large mountain range that spanned parts of what is now North America, Europe, and Africa. The Grenville orogeny is considered to be one of the earliest major orogenies in Earth’s history, based on the available geological evidence.
It’s important to note that our understanding of Earth’s geological history continues to evolve as new evidence and research become available. The timing and characteristics of the “first” orogeny are still topics of ongoing scientific investigation and debate among geologists and researchers.
.
