A lens-shaped intrusive igneous mass that forms close to the surface is called a laccolith.

Here's a breakdown:

* Lens-shaped: It has a roughly elliptical shape, much like a lentil or a convex lens.

* Intrusive: It forms when magma intrudes into existing rock layers.

* Igneous: It's composed of cooled and solidified magma.

* Close to the surface: It forms relatively shallowly within the Earth's crust.

Laccoliths form when magma pushes upwards but cannot break through the overlying rock layers. This creates a dome-like structure that can uplift the surrounding land.

Let me know if you have any more questions about igneous intrusions!