Submarine Volcano 8.10 (Kuril Island Arc)

IF 0.9 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Russian Journal of Pacific Geology Pub Date : 2023-12-01 DOI:10.1134/s1819714023080031

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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.

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海底火山 8.10（千岛群岛弧形地带）

摘要对千岛群岛（Kuril Island Arc）南伊图鲁普海底火山群（South Iturup group of submarine volcanoes）中的 8.10 号海底火山进行了研究，研究中采用了一种行之有效的技术，即结合回声测深、连续地震声学剖面以及岩石磁特性和疏浚岩石化学成分分析，对水磁测量材料进行定量解释。该技术可直接根据原始数据进行解释，而无需按照规则网格节点对数据进行初步还原。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，它们具有单一的岩浆源，但在结晶条件和动态方面有所不同。安山岩基性岩天然残余磁化的主要载体是钛含量低的钛磁铁矿，而安山岩的主要载体是磁铁矿。在火山结构中发现了馈源通道和外围岩浆室。8.10 号海底火山和其他研究过的 KIA 火山是在地磁倒转期间形成的。火山顶部出现的水声异常表明，基辅国际机场南部水下气体-热液活动的表现比人们最近认为的更为严重。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Russian Journal of Pacific Geology 地学-地球科学综合

CiteScore

1.30

自引率

37.50%

发文量

审稿时长

>12 weeks

期刊介绍： Russian Journal of Pacific Geology publishes the results of research on the Earth crust and mantle composition and provides articles on the geological structure and patterns of distribution of mineral deposits in the Pacific Ocean, marginal seas and continental margins. It discusses the topics of stratigraphy, sedimentology, magmatic activity, and seismicity. The journal deals with the problems of lithosphere plates tectonics, and offers the results of neotectonic, geomorphological, geodesic, environmental and mining studies in the Pacific region. The journal accepts theoretical, methodical and philosophical articles covering general issues of geology, geophysics, geochemistry, geoecology and mining. The journal also publishes critical notes and comments, and reviews.