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The geology of Saskatchewan can be divided into two main geological regions, the Precambrian Canadian Shield and the Phanerozoic Western Canadian Sedimentary Basin. Within the Precambrian shield exists the Athabasca sedimentary basin. Meteorite impacts have altered the natural geological formation processes. The prairies were most recently affected by glacial events in the Quaternary period.〔 〕 ==Canadian Shield== The Canadian shield, Precambrian shield, makes up the bedrock geology highlighted by rocks and lakes〔 〕 and a boreal forest area. There are transitional areas between boreal and tundra flora.〔 〕 The lower boundary of the Canadian Shield cuts across the province diagonally from the latitude 57 degrees in the north west to 54 degrees in the south east.〔 〕 Three orogenies formed the Precambrian shield, the Kenoran (Laurentian-Algoman), Hudsonian (Penokean) and Grenville Orogeny.〔 〕〔Kenoran (Algoman) orogeny〕〔 Kenoran (Algoman) orogeny 〕 Between 2.2 and 2.5 billion years ago was the Kenoran Orogeny, which was overlain by the Hudsonian Orogeny 1700 to 1900 million years ago.〔 The earth was experiencing hotter and more volatile Archean tectonics, evidencing island arc volcanic activity and mountain building.〔 Kenoran (Algoman) orogeny 〕〔 Kenoran (Algoman) orogeny 〕〔Kenoran (Algoman) orogeny〕〔Kenoran (Algoman) orogeny〕〔Hudsonian Orogeny〕 The Trans-Hudson Orogen occurred when a number of Archean continental blocks came together, including the Superior Craton from the southeast and Hearne-Rae craton from the northwest. A microcontinent named the Sask Craton was underlain in this collision zone.〔 〕 The Canadian Grenville province occurred between 1080 to 980 Ma and did not affect the geology of the Canadian Shield in Saskatchewan. The Grenvillian Orogeny deformed much of eastern Canada, and includes the Grenville Front Tectonic Zone in Quebec and Labrador, the Appalachian structural front to the south between what we now name the Great Lakes and Newfoundland. The Flin Flon greenstone belt, also referred to as the Flin Flon-Snow Lake greenstone belt, is a Precambrian greenstone belt located in the central area of Manitoba and east-central Saskatchewan, Canada. It lies in the central portion of the Trans-Hudson Orogeny and was formed by arc volcanism during the Paleoproterozoic Era.〔 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Geology of Saskatchewan」の詳細全文を読む スポンサード リンク
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