Trans-Hudson orogenic belt

The Trans-Hudson orogenic belt is a significant geological feature formed approximately 1.85 billion years ago during the Precambrian era. This event involved the collision of continental fragments, specifically the Superior and Churchill provinces, which coalesced to form a stable crust underlying much of North America.1

This process created a large, bow-shaped mountain range, the Trans-Hudson orogenic belt, whose crest is now beneath Hudson Bay. The belt's structure is typical of collision zones, featuring granitic rocks from volcanic arcs, remnants of oceanic island arcs, and shelf sediments. This amalgamation was a crucial step in the formation of the ancient continent of Laurentia, which eventually evolved into modern North America. The event is considered one of the earliest documented examples of a Wilson cycle, a process where oceans close and continents collide.12