The Sudbury Igneous Complex is a 1,844 million year-old impact melt sheet in

Greater Sudbury Sudbury, officially the City of Greater Sudbury, is the largest city in Northern Ontario by population, with a population of 166,004 at the 2021 Canadian Census. By land area, it is the largest in Ontario and the List of the largest cities and t ...

Northern Ontario Northern Ontario is a primary geographic and quasi-administrative region of the Provinces and territories of Canada, Canadian province of Ontario, the other primary region being Southern Ontario. Most of the core geographic region is located on p ...

Canada Canada is a country in North America. Its Provinces and territories of Canada, ten provinces and three territories extend from the Atlantic Ocean to the Pacific Ocean and northward into the Arctic Ocean, making it the world's List of coun ...

. It is part of the

Sudbury Basin The Sudbury Basin (), also known as Sudbury Structure or the Sudbury Nickel Irruptive, is a major geology, geological structure in Ontario, Canada. It is among the oldest- and largest-known List of impact structures on Earth, impact structures ...

impact structure, and is classified as a

lopolith A lopolith is a large igneous intrusion which is lenticular in shape with a depressed central region. Lopoliths are generally concordant with the intruded strata with dike or funnel-shaped feeder bodies below the body. The term was first defined ...

References

Significance Of Back-To-Back Facing Directions Along The South Range Of The Sudbury Igneous Complex, Ontario
Geology of Greater Sudbury Igneous petrology of Ontario Paleoproterozoic magmatism {{NorthernOntario-geo-stub