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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Geological history of the Chiricahua Mountains ： ウィキペディア英語版 Geological history of the Chiricahua Mountains The Geologic history of the Chiricahua Mountains concerns the Chiricahua Mountains, an inactive volcanic range located in Coronado National Forest of southeastern Arizona, in the United States. They are part of an "archipelago" of mountain ranges known as the sky islands that connect the Sierra Madre Occidental in Mexico with the Rocky Mountains. The Chiricahua Mountains are home to a number of unusual geologic features associated with the Turkey Creek Caldera, some of which are protected by Chiricahua National Monument. The landscape has been dominantly shaped by faulting due to Basin and Range extension during the Miocene, volcanic activity, and erosion. ==Precambrian-Mesozoic== During the Precambrian, the southwestern coastline of North America extended as far north as the present-day borders of Wyoming and Colorado. Continental growth began around 1.8 billion years ago as a sequence of island arcs (separated by seas) moved to the northwest and accreted onto the edge of North America. By 1.4 Ga, most of Arizona had been added to the continent. Paleozoic deposition in southeast Arizona occurred from about 510 to 251 Ma in a passive margin setting.〔 Throughout this time, the area was covered by an ancient sea and thick layers of limestone and sandstone were deposited.〔(【引用サイトリンク】url=http://www.nature.nps.gov/geology/inventory/publications/reports/chir_gri_rpt_view.pdf )〕 Permian-aged strata rich in fossil brachiopods, echinoid spines, and gastropods are the only Paleozoic rocks exposed in the Chiricahua Mountains, and reflect a shallow-marine coral reef environment.〔(【引用サイトリンク】url=http://skywalker.cochise.edu/wellerr/geology-SEAZ/chiricahuas/Chiricahuas-Deakin.htm )〕 These rocks are also the oldest known rocks exposed in the Chiricahuas and were formed around 280 Ma.〔 A 150-million-year unconformity in the Chiricahua Mountains’ geologic history occurs between the Paleozoic and earliest known Mesozoic rocks due to a period of uplift and erosion. Numerous volcanoes then formed in southeastern Arizona during the Mesozoic as oceanic crust subducted beneath the southwestern portion of the United States, resulting in continued continental growth.〔 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「Geological history of the Chiricahua Mountains」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.