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The Antarctic Peninsula, roughly 650 miles south of South America, is the northernmost portion of the continent of Antarctica. Like the associated Andes, the Antarctic Peninsula is an excellent example of ocean-continent collision resulting in subduction. The peninsula has experienced continuous subduction for over 200 million years, but changes in continental configurations during the amalgamation and breakup of continents have changed the orientation of the peninsula itself, as well as the underlying volcanic rocks associated with the subduction zone. ==Tectonic evolution and geology of the Antarctic Peninsula== The geology of the Antarctic Peninsula occurred in three stages: #Pre-subduction stage of marginal basin deposition, later separated by the Gondwanian orogeny during the Permian-Late Triassic #The middle subduction phase, characterized by the formation of the Antarctic Peninsula (inner) and South Shetland Islands (outer) magmatic arcs, during the middle Jurassic-Miocene. #The late subduction phase, when the opening of the Bransfield Rift and back-arc basins occur. This is followed by contemporaneous terrestrial and submarine volcanic activity, from the Oligocene-present day. 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 the Antarctic Peninsula」の詳細全文を読む スポンサード リンク
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