Submarine lava fields in French Polynesia
Submarine lava fields in French Polynesia
复制标题
法属波利尼西亚的海底熔岩区
DOI：
10.1016/j.margeo.2016.01.002
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发表时间：
2016
期刊：
影响因子：
5.8
通讯作者：
and S. Machida
中科院分区：
文献类型：
--
作者：
Hirano;N.;M. Nakanishi;N. Abe;and S. Machida
船载多波束勘测是定位海底火山尤其是体积较小的火山的有力工具。小型海底火山可能代表了热点活动的初始阶段，但它们也可能通过岩石圈弯曲、地幔区域对流和断裂带的存在而形成。在这里，我们使用多波束数据档案中的数据描述了法属波利尼西亚的几座火山、洪水熔岩和火山群。小火山群类似于小火山，它们不被认为代表热点的初始阶段，因为它们由年轻和古老的建筑物组成，而且这些地点远离任何已知的热点。这些新发现的海底火山位于 60 公里和 100 公里深度的低速地震剪切波区域。因此，这些熔岩田将有助于对与热点无关的地区的地幔进行地球化学测绘，因为这些熔岩可能是由法属波利尼西亚下方浅地幔的熔体形成的。
Shipboard multibeam survey is powerful tool to locate submarine volcanoes especially having small volume. Small submarine volcanoes may represent the initial stages of hotspot activity, but they may also form via lithospheric flexing, regional convection of the mantle, and the presence of fracture zones. Here we describe several volcanoes, flood lavas, and volcanic clusters in French Polynesia using data from archives of multibeam data. The clusters of small volcanoes are similar to petit-spots, and they are not considered to represent the initial stages of a hotspot as they are composed of both young and old edifices, and because the sites are located far from any known hotspot. These newly discovered submarine volcanoes are located in areas with low-velocity seismic shear waves at depths of 60 and 100 km. These lava fields will therefore facilitate geochemical mapping of the mantle in areas unrelated to hotspots, because these lavas may have developed from melts in the shallow mantle beneath French Polynesia.