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In fixed-wing aircraft, roll is typically controlled through ailerons.

But I am wondering if roll could also be controlled through split, independently controllable left/right elevators?

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Yes. Fighter jets with split elevators can command a roll in the way you describe, see this answer for more info.

For an aircraft like a delta wing (tail-less) that lacks a traditional empennage these control surfaces are combined into an elevon to produce a mix use elevator aileron.

The Concorde is a classic implementation of this design. Flying wings like the B-2 also use this design.

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