Why the Lake Inari Terrain? 

What makes the terrain exceptional? The Lake Inari (Fig.1) terrain in Arctic Fennoscandia preserves one of the world's most extensive and best-preserved Archaean TTG–metabasalt associations. The terrain owes its remarkable preservation to an unusual geological history. Following emplacement during the Lapland-Kola orogeny as an overthrusting crustal sheet, it was later preserved within a fault-bounded graben, escaping the high-grade metamorphism that has obscured primary geological relationships in most Archaean terranes. As a result, primary field relationships can be mapped continuously across a large Archaean terrane, a capability that is exceptionally rare worldwide. 

Why does this matter scientifically? The lake basin, dissected by numerous fault-bounded islands and continuously washed by wave action, provides outstanding three-dimensional bedrock exposure and unparalleled structural continuity. This enables geological structures to be traced across the terrain and permits comprehensive structural measurements over an extensive area, an approach that is rarely possible in Archaean terranes. Together, these characteristics make the Lake Inari terrain a unique natural laboratory for testing competing models of Earth's earliest continental crust formation.  The sheer scale of the terrain provides a unique opportunity to investigate crust-forming processes across an entire Archaean terrane rather than isolated outcrops.