Closely spaced CTD stations showed elevated oxygen within Monterey Submarine Canyon. Anomalously high (2 to 5 umol kg ^-1) dissolved oxygen was found between 600-1100m in the O₂ minimum, co-located with a turbulence hotspot caused by convergence of upcanyon, semidiurnal internal tidal energy flux. Furthermore, the oxygen anomaly extended > 10-km downcanyon at the same depth and isopycnals of a previously identified intrusion predicted from buoyancy conservation. We show that dissolved oxygen and fine suspended particles act as independent tracers to 1) validate previous microstructure observations of intense turbulence extending ~> 400 mab at the canyon hotspot, and 2) track boundary-interior exchange driven by mixing in the form of isopyncal-spreading of anomalies away from a near-boundary source. This study demonstrates the use of oxygen, commonly measured with shipboard profiling, as a tool for tracking mixing and lateral dispersal.