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Structure of the Bransfield Strait Crust

机译:布兰斯菲尔德海峡地壳的结构

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Data on the high heat flow, active volcanism, and extensional folding, in combination with modeling of the gravity and magnetic anomalies and earthquake focal mechanisms, indicate that the Bransfield strait floor represents a zone of lithosphere extension forming in the Antarctic Peninsula. The most important structural element of the strait floor is the neovolcanic zone near the South Shetland Islands and the diapirism zone near the Antarctic Peninsula. The discussed stages of rifting of the Bransfield floor reflect the propagating of the American-Antarctic Ridge into the continental lithosphere of the Antarctic Peninsula. The propagating causes thrusting of the South Shetland Island arc onto the peripheral part of the relict Phoenix plate, which is accompanied by the seismicity in the South Shetland trench.
机译:有关高热流,活跃火山作用和伸展褶皱的数据,结合重力和磁异常和地震震源机制的模型,表明布朗斯菲尔德海峡底板代表了南极半岛形成的岩石圈伸展带。海峡底部最重要的结构要素是南设得兰群岛附近的新火山带和南极半岛附近的底辟带。讨论过的Bransfield底板裂谷阶段反映了美国-南极海脊向南极半岛大陆岩石圈的传播。传播造成南设得兰群岛弧面被推到残骸凤凰板块的外围,并伴随南设得兰海沟的地震活动。

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