Sudbury Lopolith

The Sudbury Lopolith is a geological feature in Ontario, Canada, primarily composed of anorthosite, an intrusive igneous rock rich in plagioclase feldspar. This massive formation, estimated to be 3 km thick, is an example of a lopolith, which is a laccolith with a basin-shaped base. The Sudbury area is renowned for its rich mineral deposits, particularly nickel and copper, discovered during the construction of the Canadian Pacific Railway in the late 19th century. These discoveries led to the development of Sudbury as a major mining center. Anorthosite formations, like the Sudbury Lopolith, are significant as they are thought to represent the Earth's deep lithosphere.12