Geomagnetic Anomaly Distribution of Iwo-zima
Geomagnetic Anomaly Distribution of Iwo-zima
复制标题
硫磺玛地磁异常分布
DOI：
10.5026/jgeography.94.502
复制
发表时间：
1985
期刊：
影响因子：
--
通讯作者：
J. Ossaka
中科院分区：
文献类型：
--
作者：
S. Oshima;T. Kaneko;Ken;H. Nakagawa;T. Tozaki;M. Mishina;J. Ossaka
1980年和1981年分别在岛上进行了一次地磁调查、一次三分量航磁调查和一艘环岛调查船的地质/地球物理调查。这些地磁研究表明，Iwo-zima火山是由一个非磁性的中心部分和其他高度磁化的大部分组成的。计算出后者的磁化强度约为1 × 10-2 emu/cc。通过对岩样的化学和矿物学研究，认为岩样为灰质安山岩。从磁学研究结果来看，这些样品大多表现出较弱的NRM，而其他少数例外表现出较强的NRM。
A land magnetic survey on the island, a three component aeromagnetic survey and geological/geophysical investigation by a survey vessel around the island were conducted in 1980 and 1981. These geomagnetic studies suggested that Iwo-zima volcano is composed of a non-magnetic central portion and the other highly magnetized majority. The computed intensity of magnetization of the latter is roughly 1 × 10-2 emu/cc. Chemical and mineralogical studies on the dredged rock samples in the sea around Iwo-zima judged them as trachy andesites. Most of these samples show weak NRM, while the other few exceptions show relatively strong NRM according to the result of magnetic study.