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Statements

Subject Item
dbr:Volcanism_of_Canada
rdf:type
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rdfs:label
البراكين في كندا Volcanism of Canada
rdfs:comment
Volcanic activity is a major part of the geology of Canada and is characterized by many types of volcanic landform, including lava flows, volcanic plateaus, lava domes, cinder cones, stratovolcanoes, shield volcanoes, submarine volcanoes, calderas, diatremes, and maars, along with less common volcanic forms such as tuyas and subglacial mounds. يتم تمثيل البراكين في كندا من خلال العديد من أنواع التضاريس بما في ذلك تدفقات الحمم البركانية ، والهضاب البركانية ، وقباب الحمم البركانية ، ومخاريط الجمرة ، والبراكين الطبقية ، والبراكين الدرع ، والبراكين المغمورة ، والكالديراس ، والفتات ، والمار ، إلى جانب أمثلة من الأشكال البركانية الأقل شيوعًا مثل توياس والتلال تحت الجليدية. لها تاريخ بركاني معقد للغاية يمتد من عصر ما قبل الكمبري قبل 3.11 مليار سنة على الأقل عندما بدأ هذا الجزء من قارة أمريكا الشمالية في التكون.
rdfs:seeAlso
dbr:Public_Safety_Canada
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Volcanism of Canada
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A topographic map of Canada, showing elevations shaded from green to brown
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Canada topo.jpg
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Mount Edziza, British Columbia.jpg
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Mount Edziza, a stratovolcano in northwestern British Columbia
dbo:abstract
Volcanic activity is a major part of the geology of Canada and is characterized by many types of volcanic landform, including lava flows, volcanic plateaus, lava domes, cinder cones, stratovolcanoes, shield volcanoes, submarine volcanoes, calderas, diatremes, and maars, along with less common volcanic forms such as tuyas and subglacial mounds. Though Canada's volcanic history dates back to the Precambrian eon, at least 3.11 billion years ago, when its part of the North American continent began to form, volcanism continues to occur in Western and Northern Canada in modern times, where it forms part of an encircling chain of volcanoes and frequent earthquakes around the Pacific Ocean called the Pacific Ring of Fire. Because volcanoes in Western and Northern Canada are in relatively remote and sparsely populated areas and their activity is less frequent than with other volcanoes around the Pacific Ocean, Canada is commonly thought to occupy a gap in the Ring of Fire between the volcanoes of the western United States to the south and the Aleutian volcanoes of Alaska to the north. Even so, the mountainous landscapes of the Canadian provinces of Alberta, British Columbia, Yukon Territory, and the Northwest Territories include more than 100 volcanoes that have been active during the past two million years and whose eruptions have claimed many lives. Volcanic activity is responsible for many of Canada's geological and geographical features and mineralization, including the nucleus of the North American continent, known as the Canadian Shield. Volcanism has led to the formation of hundreds of volcanic areas and extensive lava formations across Canada. The country's different volcano and lava types originate from different tectonic settings and types of volcanic eruptions, ranging from passive lava eruptions to violent explosive eruptions. Canada has a rich record of very large volumes of magmatic rock called large igneous provinces, represented by deep-level plumbing systems consisting of giant dike swarms, sill provinces and layered intrusions. The most capable large igneous provinces in Canada are Archean greenstone belts estimated at 3.8 to 2.5 billion years old, containing a rare volcanic rock called komatiite. يتم تمثيل البراكين في كندا من خلال العديد من أنواع التضاريس بما في ذلك تدفقات الحمم البركانية ، والهضاب البركانية ، وقباب الحمم البركانية ، ومخاريط الجمرة ، والبراكين الطبقية ، والبراكين الدرع ، والبراكين المغمورة ، والكالديراس ، والفتات ، والمار ، إلى جانب أمثلة من الأشكال البركانية الأقل شيوعًا مثل توياس والتلال تحت الجليدية. لها تاريخ بركاني معقد للغاية يمتد من عصر ما قبل الكمبري قبل 3.11 مليار سنة على الأقل عندما بدأ هذا الجزء من قارة أمريكا الشمالية في التكون. على الرغم من أن النشاط البركاني للبلاد يعود إلى عصر ما قبل الكمبري ، إلا أن النشاط البركاني لا يزال يحدث في غرب وشمال كندا حيث يشكل جزءًا من سلسلة محاصرة من البراكين والزلازل المتكررة حول المحيط الهادئ تسمى حلقة النار في المحيط الهادئ. ولكن نظرًا لوجود البراكين في غرب وشمال كندا في مناطق وعرة نائية ومستوى النشاط البركاني أقل تواترًا من البراكين الأخرى حول المحيط الهادئ ، يُعتقد عمومًا أن كندا تحتل فجوة في حلقة النار في المحيط الهادئ بين براكين الغرب. الولايات المتحدة من الجنوب والبراكين الأليوتية في ألاسكا في الشمال. ومع ذلك ، فإن المناظر الطبيعية الجبلية في غرب وشمال كندا تضم أكثر من 100 بركان نشط خلال المليوني سنة الماضية والتي أودت ثوراناتها بحياة العديد من الأشخاص. كان النشاط البركاني مسؤولاً عن العديد من الميزات الجيولوجية والجغرافية في كندا وتمعدنها ، بما في ذلك نواة أمريكا الشمالية المسماة الدرع الكندي. أدت البراكين إلى تكوين مئات المناطق البركانية وتشكيلات الحمم البركانية الواسعة في جميع أنحاء كندا ، مما يشير إلى أن البراكين لعبت دورًا رئيسيًا في تشكيل سطحها. تنشأ أنواع البراكين والحمم المختلفة في البلاد من إعدادات تكتونية مختلفة وأنواع من الانفجارات البركانية ، بدءًا من انفجارات الحمم البركانية السلبية إلى الانفجارات المتفجرة العنيفة. تمتلك كندا سجلًا غنيًا بأحجام كبيرة جدًا من الصخور البركانية تسمى المقاطعات النارية الكبيرة. يتم تمثيلهم من خلال أنظمة السباكة العميقة التي تتكون من أسراب عملاقة من السدود ، ومقاطعات عتبات وتداخلات متعددة الطبقات. أكثر المقاطعات النارية الكبيرة قدرة في كندا هي أحزمة الحجر الأخضر العمري (منذ 3800-2500 مليون سنة) التي تحتوي على صخرة بركانية نادرة تسمى كوماتايت وهي من اندر الصخر
dbp:geology
dbr:Volcano
prov:wasDerivedFrom
wikipedia-en:Volcanism_of_Canada?oldid=1104197790&ns=0
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139728
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wikipedia-en:Volcanism_of_Canada