What is a migrating terrane, and how does it add to the formation of continental masses?

A migrating terrane, also referred to as a tectonic or geological terrane, is a fragment of crustal material that broke off from one tectonic plate and accreted or 'stuck' to the crust of another. These terranes often have a history that is different from the areas to which they are sutured, hence the name 'exotic' terranes.

Migrating terranes contribute to the formation of continental masses through a process known as terrane accretion. This occurs in the following steps:1. A migrating terrane is transported towards a continent by plate tectonic movements. 2. As the terrane and the continent converge, the oceanic crust between them is subjected to subduction, creating a trench. 3. Over time, the terrane collides with the continent. 4. During collision, the terrane is subjected to tectonic forces, leading to uplift and folding. 5. Subsequent erosion and sedimentation contribute to the growth of the continental mass by adding more material on top. 6. The process can be repeated with multiple terranes, leading to the progressive growth of the continental mass over millions of years.