Petrology of impactites from Lake St. Martin structure, ManitobaThe 23-km Lake St. Martin crater was produced 200 to 250 million years ago in Archean granitic to amphibolic gneiss, overlain by 400 to 500 m of Ordovician to Devonian limestone and dolomite. In the present paper, a schematic model of the field geology, petrology, and geochemistry is presented. The scenario is built in part on the calculations of Kieffer and Simonds and observations made on the Lake St. Martin structure.
Document ID
19800039535
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Simonds, C. H. (Northrop Lunar Curatorial Laboratory Houston, Tex., United States)
Mcgee, P. E. (Penzoil Co. Houston, Tex., United States)