Geologists reveal the Americas collided millions of years earlier than thought
Geologists studying volcanic rocks in Colombia have determined that the tectonic collision between Central and South America occurred earlier than previously estimated. Using magnetic fabric analysis, researchers concluded that major crustal deformation took place before 10 million years ago.
Why it matters
Refining the timeline of tectonic plate movements is essential for understanding the geological evolution and biodiversity patterns of the Americas.
A new study in Earth and Planetary Physics is changing scientists' understanding of when Central America and South America underwent one of the major tectonic collisions that helped shape the Americas. By examining the magnetic characteristics of volcanic rocks in Colombia's Northern Andes, researchers found evidence that the main phases of collision took place earlier than previously believed, before about 10 million years ago.
The research was led by Victor Piedrahita (first author) and J. Li (corresponding author), along with an international group of geoscientists. Their work centered on late Miocene volcanic rocks (approximately 12-6 million years old) from the Combia Volcanic Province in central Colombia. These rocks formed during a key period when the South American Plate was interacting with the continental portion of Central America.
Magnetic Clues Preserved in Volcanic Rocks
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