九州北部佐贺县天山地区蛇绿岩杂岩地球化学特征

IF 0.9 4区地球科学 Q4 MINERALOGY

Journal of Mineralogical and Petrological Sciences Pub Date : 2022-01-01 DOI:10.2465/jmps.210831

Yusaku Tanaka, K. Eshima, M. Owada

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引用次数: 1

摘要

九州北部天山地区变质杂岩以镁质岩为主，少量含硅质、钙硅酸盐和超镁质岩。这些岩相可识别为蛇绿岩杂岩。变质岩分为角闪岩I型和角闪岩II型两类，可能分别来源于表壳岩和侵入岩。两种角闪岩的地球化学资料在洋中脊和岛弧玄武岩之间的场内绘制;这些地球化学特征与弧后盆地玄武岩相似。由于变质杂岩被白垩纪花岗岩类侵入，杂岩的原岩形成可能早于白垩纪。天山变质杂岩的原岩岩相组合和地球化学约束指示其与崖野蛇绿岩的相关性，而不是与山山蛇绿岩的相关性。

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Geochemical characteristics of an ophiolitic complex from Mt. Tenzan area, Saga Prefecture, northern Kyushu

The metamorphic complex from the Mt. Tenzan area in northern Kyushu consists mainly of ma ﬁ c rocks with small amounts of siliceous, calc – silicate, and ultrama ﬁ c rocks. These lithofacies can be recognized as an ophiolitic complex. Metamorphosed ma ﬁ c rocks are divided into two types, amphibolites I and II, which are probably derived from supracrustal and intrusive rocks, respectively. The geochemical data of both amphibolites plotted within the ﬁ eld between mid – ocean ridge and island arc basalts; such geochemical features resemble those of back – arc basin basalts. As the metamorphic complex was intruded by Cretaceous granitoids, protoliths of the complex could have been formed prior to the Cretaceous. The protolith lithofacies assemblage and geochemical constraints of the Tenzan metamorphic complex indicate the correlation with the Yakuno ophiolite rather than the Oeyama ophiolite.

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来源期刊

Journal of Mineralogical and Petrological Sciences 地学-矿物学

CiteScore

1.80

自引率

14.30%

发文量

审稿时长

>12 weeks

期刊介绍： The Journal of Mineralogical and Petrological Sciences (JMPS) publishes original articles, reviews and letters in the fields of mineralogy, petrology, economic geology, geochemistry, planetary materials science, and related scientific fields. As an international journal, we aim to provide worldwide diffusion for the results of research in Japan, as well as to serve as a medium with high impact factor for the global scientific communication Given the remarkable rate at which publications have been expanding to include several fields, including planetary and earth sciences, materials science, and instrumental analysis technology, the journal aims to encourage and develop a variety of such new interdisciplinary scientific fields, to encourage the wide scope of such new fields to bloom in the future, and to contribute to the rapidly growing international scientific community. To cope with this emerging scientific environment, in April 2000 the journal''s two parent societies, MSJ* (The Mineralogical Society of Japan) and JAMPEG* (The Japanese Association of Mineralogists, Petrologists and Economic Geologists), combined their respective journals (the Mineralogical Journal and the Journal of Mineralogy, Petrology and Economic Geology). The result of this merger was the Journal of Mineralogical and Petrological Sciences, which has a greatly expanded and enriched scope compared to its predecessors.