Abstract

Submarine volcano 8.10, which is part of the South Iturup group of submarine volcanoes in the Kuril Island Arc (KIA), was studied using a proven technology of quantitative interpretation of hydromagnetic survey materials in combination with echo sounding, continuous seismoacoustic profiling, and analysis of petromagnetic properties and chemical composition of dredged rocks. The technology makes it possible to interpret directly from the original data without resorting to the procedure of their preliminary restoration in the nodes of a regular grid. The studies found that dredged andesite-basalts and andesites are representatives of different lava flows that have a single magma source but differ in the conditions and dynamics of crystallization. The main carrier of the natural residual magnetization of andesite-basalts is titanomagnetite with low Ti content and that for andesites is magnetite. Feeding channels and peripheral magma chambers are identified in the volcanic edifice. Submarine volcano 8.10 and other studied KIA volcanoes formed during geomagnetic inversions. The presence of hydroacoustic anomalies at the top of the volcano indicates that manifestations of underwater gas-hydrothermal activity in the southern part of the KIA are more significant than was thought until recently.

中文翻译：

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海底火山8.10（千岛岛弧）

摘要

海底火山 8.10 是千岛岛弧 (KIA) 南伊图鲁普海底火山群的一部分，采用成熟的水磁勘测材料定量解释技术，结合回声探测、连续地震声剖面和地震波分析进行了研究。疏浚岩石的岩磁特性和化学成分。该技术使得直接从原始数据进行解释成为可能，而无需诉诸于规则网格节点中的初步恢复过程。研究发现，疏浚的安山岩-玄武岩和安山岩是不同熔岩流的代表，这些熔岩流具有单一岩浆源，但结晶条件和动力学不同。安山玄武岩天然剩磁的主要载体是低Ti含量的钛磁铁矿，安山岩的主要载体是磁铁矿。在火山大厦中发现了供给通道和外围岩浆室。海底火山 8.10 和其他研究的 KIA 火山是在地磁反转过程中形成的。火山顶部水声异常的存在表明，克钦独立亚南部地区水下气体热液活动的表现比人们最近认为的更为显着。