关于新生代火山活动和水下维蒂亚兹海脊(千岛群岛弧太平洋斜坡)地球动力学的同位素地球化学新数据

IF 0.9 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY
T. A. Emelyanova, Yu. A. Martynov, N. S. Lee, M. Yu. Davydova
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引用次数: 0

摘要

本文介绍了水下维蒂亚兹海脊北部高原南部和西南部火山岩中微量元素和放射性钕、铷同位素的原始分析数据。通过对这些数据的解释,以及与已发表的有关千岛群岛弧(Kuril Island Arc,KIA)南部和北部火山岩的资料进行比较,我们得出了以下结论。南部高原和千岛群岛弧南部的火山岩中的托勒密岩具有相似的同位素地球化学特征,这表明形成的地球动力条件相似,低温流体对岩浆生成过程的影响相同。北部高原的火山岩主要以亚碱性火山岩为代表,其地球化学特征表明,与南部高原的岩石相比,地幔成分对岩浆生成的作用更为明显,高温熔体的影响程度更大,但与弧北部的岩石相比,高温熔体的影响程度较小。两个高原的火山岩都是单一地幔源--印度洋 MORB(印度 MORB)--的衍生物,与千岛群岛南部的岩石一起形成于伴随千岛海盆开辟的构造运动过程而转变的岩石圈区块内。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

New Isotope-Geochemical Data on the Cenozoic Volcanism and the Geodynamics of the Underwater Vityaz Ridge (Pacific Slope of the Kuril Island Arc)

New Isotope-Geochemical Data on the Cenozoic Volcanism and the Geodynamics of the Underwater Vityaz Ridge (Pacific Slope of the Kuril Island Arc)

Original analytical data on trace elements and radiogenic Nd and Pb isotopes in the volcanic rocks of the Southern and southwestern part of the Northern plateaus of the underwater Vityaz Ridge are presented. Interpretation of these data and a comparison with published materials on the volcanic rocks from the southern and northern parts of the Kuril Island Arc (KIA), which formed on two basement blocks of different genetic nature, allow us to draw the following conclusions. The tholeiite varieties of volcanic rocks of the Southern Plateau and the southern part of the KIA have similar isotope-geochemical features, which point to the similar geodynamic conditions of the formation and the identical influence of low-temperature fluid on magma-generating processes. The geochemistry of the volcanic rocks of the Northern Plateau, which are mainly represented by subalkaline varieties, indicates a more pronounced contribution of the mantle component to the magmagenesis and a greater degree of influence of high-temperature melt compared to the rocks of the Southern Plateau, but a lesser degree compared to the rocks of the northern part of the arc. The volcanics of both plateaus are derivatives of a single mantle source, the MORB of the Indian Ocean (Indian MORB), and were formed together with the rocks of the southern part of the KIA within the lithospheric block transformed by tectonomagmatic processes that accompanied the opening of the Kuril Basin.

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来源期刊
Russian Journal of Pacific Geology
Russian Journal of Pacific Geology 地学-地球科学综合
CiteScore
1.30
自引率
37.50%
发文量
34
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.
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