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首页> 外文期刊>Earth, planets and space: EPS >Gravity and magnetic constraints on the crustal structure and evolution of the Horeki seamount in the Izu-Ogasawara (Bonin) arc
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Gravity and magnetic constraints on the crustal structure and evolution of the Horeki seamount in the Izu-Ogasawara (Bonin) arc

机译：重力和磁约束对伊豆-小ara原（波宁）弧线内霍雷基海山的地壳结构和演化

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摘要

Data on the crustal structure, bulk composition, and eruption ages of an arc seamount were obtained in an investigation aimed at studying the spatial and temporal variations in the magma composition of an intra-oceanic arc. We conducted gravity and magnetic surveys of the Horeki seamount and evaluated the density and magnetization structure using inversion and forward modeling. The seamount is located on the back-arc side of the Izu-Ogasawara arc. This seamount has an elliptical shape, a flat summit, and satellite ridges and cones on its northern and southern flanks. The flanks are consistent with a higher density anomaly, with an estimated mean density corresponding to dense basaltic rocks. A low-density anomaly is distributed in the seamount top, indicating that the top likely consists of porous basalts or differentiated rocks. The prominent circular low Bouguer gravity anomaly, which appeared in the northern part of the flat-topped summit, indicates that a light-density material fills the summit. The main body of seamount is normally magnetized. Combined with the age of the rocks, the volcanism constructing the main body may be most robust in the Gauss chron. The deeper part of seamount may consist of intrusive rocks, with induced magnetization over remanence. The eastern part of the northern ridges is reversely magnetized, while the western part is normally magnetized. These features and the ages of the sampled rocks suggest that these ridges were constructed in the Matuyama and Brunhes chrons, respectively. The southern part of the seamount flanks shows weak normal magnetization, probably caused by the small cones with different polarities of remanent magnetization.
机译：在一项旨在研究海洋内部弧的岩浆成分的时空变化的调查中，获得了有关弧海山的地壳结构，块体组成和喷发年龄的数据。我们对Horeki海山进行了重力和磁力测量，并使用反演和正演模型评估了密度和磁化结构。海山位于伊豆小gas原弧的弧后侧。该海山呈椭圆形，山顶平坦，南北两侧都有卫星脊和圆锥。两侧与较高的密度异常一致，估计的平均密度对应于致密的玄武岩。低密度异常分布在海山顶，表明该顶可能由多孔玄武岩或分化的岩石组成。平顶山顶的北部出现了突出的圆形低布格重力异常，表明光密度材料充满了山顶。海山的主体通常被磁化。结合岩石的年龄，构造主体的火山活动在高斯年代可能是最坚固的。海山的较深部分可能由侵入性岩石组成，剩余磁感应强度很高。北部山脊的东部被反向磁化，而西部通常被磁化。这些特征和采样岩石的年龄表明，这些山脊分别建于Matuyama和Brunhes年代。海山侧翼的南部显示弱的正常磁化强度，这可能是由具有不同剩余磁化强度极性的小圆锥体引起的。

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