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Pleistocene volcanism on S?o Tomé, Gulf of Guinea, West Africa

机译：西非几内亚湾圣托美的更新世火山活动

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摘要

New Ar/Ar data for alkaline basaltic rocks on theWest African island of S?o Tomé document a Pleistocene eruptive episode that saw the formation of cinder cones and lava flows between 0.036±0.004 and 0.86±0.02 Ma (2s). The cinder cones trend north-northeast along the long axis of the island, interpreted as a rift zone. This rift zone appears to be the source of several lava flows that reach the coastline, including one that underlies the airport of S?o Tomé. Estimates of magma production rates, both from recent lava flows and from consideration of the total edifice history suggest low magma production rates (10~(-4)e10~(-2) m~3/s), compared to other ocean island settings. Assuming a background of low overall volcanic activity, it is expected that any future eruptions would most likely occur along the northnortheast rift, resulting in cinder cone and lava flow emplacements that may impact the densely populated northeast region of the island.
机译：西非圣多美岛上碱性玄武岩的新Ar / Ar数据记录了更新世的爆发，见到煤渣锥和熔岩流的形成介于0.036±0.004和0.86±0.02 Ma（2s）之间。煤渣锥沿着岛屿的长轴向东北偏北，被解释为裂谷带。这个裂谷带似乎是到达海岸线的几处熔岩流的来源，其中包括在圣托梅机场下方的熔岩流。从最近的熔岩流和对总的造船历史的考虑来看，对岩浆产生速率的估计表明，与其他海洋岛屿环境相比，岩浆产生速率较低（10〜（-4）e10〜（-2）m〜3 / s）。 。假设总体火山活动较低，那么未来任何火山喷发最有可能沿着东北裂谷发生，从而导致煤渣锥和熔岩流进位，可能会影响该岛人口稠密的东北地区。

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