* Lack of Volcanic Activity: Subduction zones are often associated with active volcanoes, as the descending plate melts, generating magma that rises to the surface. If a mountain range has no volcanic history or present-day volcanoes, it's unlikely to be formed by subduction.
* Absence of Deep Ocean Trenches: Subduction zones involve one plate diving beneath another, creating a deep trench along the boundary. If there's no evidence of a trench in the ocean near the mountain range, subduction is less likely.
* Limited or No Metamorphism: Subduction zones are characterized by high pressure and temperatures, which can significantly alter the rocks through metamorphism. If a mountain range lacks evidence of significant metamorphic rock formations, it might not be a subduction-related structure.
* Symmetrical Mountain Range Structure: Subduction-related mountain ranges are often asymmetrical, with one side steeper than the other due to the influence of the descending plate. A symmetrical range suggests a different formation mechanism.
* Dominant Rock Type: Subduction zones often lead to the formation of specific rock types, like ophiolites (oceanic crust) and high-pressure metamorphic rocks. If the mountain range primarily consists of other types of rocks, it might not be formed by subduction.
Important Note: It's crucial to consider the geological history of the region. Some mountains formed by subduction might have lost evidence of their origins due to erosion, tectonic activity, or geological time.
