When two continental plates collide at a convergent boundary, one plate is usually forced beneath the other in a process called subduction. This typically occurs when an oceanic plate converges with a continental plate, but when two continental plates collide, neither plate is easily subducted due to their buoyancy. Instead, the collision results in significant deformation of the crust, leading to the formation of mountain ranges, like the Himalayas, which formed from the collision of the Indian and Eurasian plates.
If the tectonic activity shifts and this region transforms into a transform boundary, the nature of movement between the plates changes. At a transform boundary, plates slide past each other horizontally. This can lead to significant earthquakes due to the build-up of stress along faults where the plates interact.
If the tectonic forces also continue to push upward despite the shift to a transform boundary, you could still see the formation of additional geological features, such as:
- Mountain Ranges: The ongoing compressive forces might still contribute to the uplift and creation of mountain ranges if the plates remain convergent in nature.
- Volcanic Activity: If there is any subduction beneath the transform boundary due to nearby oceanic plates, this could still lead to volcanic activity and the formation of volcanic arcs.
Overall, the geological features that develop would be a complex interplay of tectonic forces, including uplift from continued compression and lateral movement from the transform boundary. You'll likely encounter a diverse landscape with mountains, possibly volcanism if subduction is involved, and a tendency for seismic activity due to the complex interactions of the tectonic plates.