If you hover your mouse over Carbonite's map, you can scroll your mouse wheel to zoom in (up) and out (down) respectively.
Currently Carbonite features no such thing for Blizzard's minimap, but you can toggle the zoom level with the [+] and [-] buttons (by default). There are also some addons that let you hover-scroll the zoom level like Carbonite does, only on the minimap. SexyMap is one of those. However, I only recommend that addon if you are NOT using Carbonite merged with the Blizzard minimap.
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