In eastern Labrador and northern Quebec, geological
features represent a microcosm of Precambrian continental evolution.
Portions of three Archean cratons (Superior, Rae and Nain)
and five Proterozoic orogenic belts (Eastern Churchill Province
including the New Quebec and Torngat orogens, the Labrador
orogen and the Makkovik and easternmost Grenville provinces)
are being investigated. Together, these embrace a geological
history ranging form 3800 to 900 Ma and chronicle the construction
of a significant part of eastern North America. Three principal
scientific themes form the foundation of transect activities:
- lithospheric structure of the Nain Province, a type example
of a high-grade Archean craton;
- the 3-d architecture of the Proterozoic orogens which
comprise two broad and different groups, one in which deformation
was driven primarily by continental collision and the
other
in
which terrane accretion was the dominant factor;
- links between Precambrian basement structure and the development
of the Mesozoic-Cenozoic margin.
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