"Magmatism, metallogeny and tectonics of the Paleoproterozoic core of Canada"

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The Earth's continental crust consists of fragments of ancient igneous and sedimentary rocks that record a complex geological history of crustal growth and reworking over the last 4 billion years. The Precambrian Shield makes up a significant portion of the crust in Canada, and many of the Archean (>2.5 billion years old) components were joined together about 1.8 billion years ago during a cataclysmic collision, called the Trans-Hudson orogeny, that is preserved in a linear belt that extends from Saskatchewan to Baffin Island. The collision, which was related to the motion of lithospheric plates, formed a mountain range that was probably of the same scale as the present-day Himalayas. In the lead up to the collision, there were complex interactions between different crustal elements which generated magmas, sediments, and structures. The aim of part of this research, which involves mapping and sampling in the field by a number of graduate and undergraduate students, and the application of modern analytical techniques for the analysis of trace elements and isotopes is to unravel the interaction between different crustal blocks prior to the major collision 1.8 billion years ago. It will be necessary to define the composition of different parts of the crust and mantle in order to understand how they interacted.