re: yes
Why, yes, the sulfates could be gypsum and the chlorine might be in halides. Also note that salts and sulfates can be deposited together (expressed by the green blobs in the middle of the chart). What is also important is the expected stratigraphy.
But this is an idealized model of evaporating a 1 km deep body of water that has a chemistry of a modern terrestrial ocean. It doesn't account for variation in chemistry or fluctuations in sea level, concentration in a restricted basin, periodic drying, or other variables.