What would happen if the impact of chicxulub or another similar sized asteroid happened on a massive flat target circle made of pure diamond? Of course thickness matters, so how much would it take to not be obliterated? 100 feet? 1000 feet? How much damage would it do to a 1000 foot thick, 7 mile diameter (or just big enough for the whole asteroid to hit directly without much extra surface) disc? The disc would be sitting on top of the ground rather than buried in it, in case that makes a difference. This definitely is not a practical science question, just a sort of physics thought experiment I thought of but don't have the expertise to actual stove.