Petit-spot lava fields off the central Chile trench induced by plate flexure
Petit-spot lava fields off the central Chile trench induced by plate flexure
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DOI：
10.2343/geochemj.2.0227
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发表时间：
2013-04
影响因子：
0.8
通讯作者：
N. Hirano;S. Machida;N. Abe;T. Morishita;A. Tamura;S. Arai
中科院分区：
文献类型：
--
作者：
N. Hirano;S. Machida;N. Abe;T. Morishita;A. Tamura;S. Arai
弯曲板的形成，诱导熔体上升并驱动已经存在的部分熔体的收集（Valentine和Hirano，2010）。因此，微小海底火山的位置是板块应力场的重要指标，并提供了板块下方地幔地球化学成分的信息（Hirano，2011）。西北太平洋板块的单成因小点火山代表了构造环境中的另一种火山作用（Hirano等人，2006年）。与热点火山相反，小点火山作用即使发生在板内环境中，也不从深部地幔获得任何热量供应。相比之下，夏威夷拱的北拱火山场受到夏威夷地幔柱的地球化学影响（Frey等人，2000年），尽管该地点远离夏威夷羽流中心（目前位于活动的基拉韦厄火山和Loihi海山下方，距离北拱门油田约600公里）。虽然这些海底火山的生成受到岩石圈中扩展到地表的裂缝的影响，但这些小点火山是否与底层板块弯曲和断裂的地区有成因关系仍然不确定。本研究介绍了2009年3月期间，利用智利海沟中部附近由板块挠曲引起的小斑点熔岩区研究船，沿瓦尔帕莱索附近智利海沟的向海斜坡沿着进行的研究巡航的结果
mation of a flexed plate, inducing melt-ascent and driving collection of already existing partial melts (Valentine and Hirano, 2010). The location of the tiny submarine volcanoes is, therefore, an important indicator of the stress field of the plate and provides information on the geochemical composition of the mantle below the plate (Hirano, 2011). The monogenetic petit-spot volcanoes of the NW Pacific Plate represent another kind of volcanism in tectonic settings (Hirano et al., 2006). The petit-spot volcanism, in contrast to hotspot volcanoes, does not derive any heat supply from the deep mantle, even though it occurs in an intra-plate setting. The North Arch volcanic field of the Hawaiian Arch, in contrast, is geochemically influenced by the Hawaiian mantle plume (Frey et al., 2000), although the site is distant from the Hawaiian plume center (currently below the active Kilauea volcano and Loihi seamount, approximately 600 km from the North Arch field). Although the generation of these submarine volcanoes is influenced by cracks in the lithosphere that propagate to the surface, it remains uncertain whether these petit-spot volcanoes have a genetic relationship with the areas where the underlying plate has flexed and fractured. This study presents results from a research cruise undertaken along the oceanward slope of the Chile trench off Valparaiso during March 2009, using the research ship Petit-spot lava fields off the central Chile trench induced by plate flexure