This is a "Tar Spot" disease usually found in Europe and North America. It mostly affects the Maple tree leaves. Tar spot is caused by 'Rhytisma acerinum' a plant pathogen fungus. This pathogen does not seem harm to tree but disturbs the leaves as it finds a suitable condition in summer with bit of wetness. It enters the leaves through stoma and then creates yellow lesions of various sizes over the leaf area which later gradually turns into brown-black tar colored spot. It reduces the photosynthesis process of leaves and thus creating more wide dark spots on the leaves. After sometime the leaves will fall.
Entire detail is available in the Wikipedia link with the detail of the pathogen. (Add some more info if you find this detail not enough)
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