What are some examples of igneous rocks that are plutonic?

Now, I've mentioned felsic igneous rocks, which are widespread in our crust. Mafic plutons are less frequent in our crust, but they do occasionally occur, such as at hotspots.

If a pluton of mafic magma were to be pushed into the crust, it would form something resembling a gabbro.

The three granitoids that I mentioned above are all considered plutonic because of their slow cooling rate, which can be determined by looking at the size of the grains; the larger the mineral, the slower the cooling rate. This phenomenon is similar to the principle that when you make noodles, if you take them out of the boiling water quickly, they will be quite thin; if you leave them in the water longer, they will absorb more and become thicker.

Hence, for igneous rocks, a small grain size corresponds to rapid cooling and a large grain size to slow cooling.

Granite, diorite, and gabbro.