A new volcanic province: an inventory of subglacial volcanoes in West Antarctica
A new volcanic province: an inventory of subglacial volcanoes in West Antarctica
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DOI：
10.1144/sp461.7
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发表时间：
2018-01-01
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影响因子：
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通讯作者：
Hein, Andrew S.
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作者：
de Vries, Maximillian van Wyk;Bingham, Robert G.;Hein, Andrew S.
西南极冰盖覆盖在西南极裂谷系统之上，由于全面的冰盖，我们对火山活动及其范围的了解有限且零星。增进我们对该省各地冰下火山活动的了解，对于帮助限制火山活动和裂谷可能如何影响前几次冰川周期中冰盖的生长和衰退，以及考虑到地热通量增强和冰下融化是否可能导致西南极冰盖不稳定的关切，都具有重要意义。在这里，我们使用冰盖床海拔数据来定位在南极洲西部的冰层中突出的个别圆锥形建筑物，我们认为这些建筑物代表冰下火山。我们使用了航磁、航空重力、卫星图像和已确认火山的数据库来支持这一解释。这里给出的总体结果构成了对西南极冰下火山活动的第一次盘点。我们确定了138座火山，其中91座以前没有被识别出来，它们广泛分布在西南极的深盆地中，但特别集中在西南极裂谷系统3000公里的中轴线上。
The West Antarctic Ice Sheet overlies the West Antarctic Rift System about which, due to the comprehensive ice cover, we have only limited and sporadic knowledge of volcanic activity and its extent. Improving our understanding of subglacial volcanic activity across the province is important both for helping to constrain how volcanism and rifting may have influenced ice-sheet growth and decay over previous glacial cycles, and in light of concerns over whether enhanced geothermal heat fluxes and subglacial melting may contribute to instability of the West Antarctic Ice Sheet. Here, we use ice-sheet bed-elevation data to locate individual conical edifices protruding upwards into the ice across West Antarctica, and we propose that these edifices represent subglacial volcanoes. We used aeromagnetic, aerogravity, satellite imagery and databases of confirmed volcanoes to support this interpretation. The overall result presented here constitutes a first inventory of West Antarctica's subglacial volcanism. We identified 138 volcanoes, 91 of which have not previously been identified, and which are widely distributed throughout the deep basins of West Antarctica, but are especially concentrated and orientated along the >3000 km central axis of the West Antarctic Rift System.