Wait a minute, tectonism may be having a lot more effects then raising CO2. Why do you assume it wasn't some other aspect of such events?
But if your right, shouldn't we see CO2 go up either before or at the same time as the temperature when such an event is to blame? Put another way: what is poking the bowling ball in this case?
Given the highest possible resolution of events when tectonism drives climate change (Paleozoic and Mesozoic, millions of years), temperature and CO2 vary in sync.