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- W2138406977 abstract "Abstract Stockwell's structural divisions of the Canadian Shield, and his Precambrian time‐classification based on major tectono‐thermal events are reviewed. The three main divisions of Proterozoic time, the Aphebian, Helikian, and Hadrynian Eras, follow the Kenoran, Hudsonian and Grenvillian Orogenies, whose terminations are currently dated on the U‐Pb scale at about 2550, 1750, and 1000 m.y. before present, respectively. Proterozoic supracrustal sequences are most commonly of shallow marine or continental origin, and high‐level intrusions predominate. ‘Classical’ geosynclinal cycles have been restricted to the Aphebian Era. High‐grade Aphebian rocks in the mid‐Churchill Province evidently mark the peak of Hudsonian tectonism. Subsequently, the Shield became relatively stable except for the Grenville Province, and deposition and deformation resulted from epeirogenesis, block‐faulting and rifting, mainly in the western Shield. Proterozoic sedimentation and volcanism likewise diminished in Helikian time and terminated in early Hadrynian time, about 800 m.y. ago. The history of the Grenville Orogen remains obscure. The continuity of major Archaean to Helikian rock units into the Grenville from adjacent provinces constrains proposals for a marginal plate boundary and convincing evidence for Proterozoic plate boundaries within the Grenville Province is lacking, palaeomagnetic evidence notwithstanding." @default.
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- W2138406977 date "1976-12-01" @default.
- W2138406977 modified "2023-10-18" @default.
- W2138406977 title "Proterozoic highlights of the Canadian Shield: A review" @default.
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- W2138406977 doi "https://doi.org/10.1080/00167617608728958" @default.
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