Chemical characteristics of sedimentary rocks and meta-sedimentary rocks of tectonic belts in Japanese Islands and geological environments of their formations

日本列岛构造带沉积岩、变沉积岩化学特征及其形成地质环境

• 批准号: 03402018
• 负责人: KAWABE Iwao
• 金额: $ 19.33万
• 依托单位: Nagoya University (1993)Ehime University (1991-1992)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (A)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03402018/
• 关键词: Sedimentary rocks; Carbonate rocks; Rare earths; Tectonic belts; 石灰質片麻岩; テトラド効果; 深海マガンノジュ-ル; 領家変成岩

We have installed an ICP-AES spectrometer (Seiko SPS-1500R) and established REE plus Y determinations in various types of sedimentary rocks. We have applied our ICP-AES method to determining REE and Y in limestones, dolostones, metamorphic rocks, Precambrian iron ores, and deep-sea ferromanganese nodules. We focused on the chemical classification of carbonate rocks in the tectonic belts in Japanese Islands from REE and Y analyzes. The three types of (1) coral reef-type, (2) continental margin-type, and (3) deep-see type are distinguished. Their geological environments of carbonate rock formations inferred from our geochemical data are in good agreements with previous sedimentological and geological analyzes.We also made an important theoretical study of "Tetrad effect", which must be an important basis to understand REE behaviors in sediment-water systems in low temperatures. From this viewpoint, experimental study on partitioning of REE and Y in the system of FE-Mn hydroxide and NaCl solution have been initiated. It is the first step to elucidate the REE behaviors not only in sedimentary rock formations but also in aquatic earth's environments.

我们安装了ICP-AES光谱仪（精工SPS-1500 R），并建立了各种类型的沉积岩中的稀土元素和Y的测定。我们用ICP-AES法测定了石灰岩、白云岩、变质岩、前寒武纪铁矿石和深海铁锰结核中的稀土和钇。从稀土元素和钇元素分析入手，对日本列岛构造带碳酸盐岩进行了化学分类。划分出珊瑚礁型、大陆边缘型和深湖型三种类型。根据地球化学资料推断的碳酸盐岩建造的地质环境与前人的沉积学和地质学分析相吻合，并对“四分体效应”进行了重要的理论研究，这将是认识低温下沉积物-水体系中稀土元素行为的重要依据。从这一观点出发，开展了稀土和钇在Fe-Mn氢氧化物-NaCl体系中分配的实验研究。这是阐明稀土元素在沉积岩建造和水生地球环境中行为的第一步。

项目成果

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Yhara, M.、Komatsu, M. 和 Kawabe, I.：“伊那地区 Ryoke 变质岩和花岗岩的稀土丰度：可能是花岗岩化作用。”

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Komatu, M.、Nagasa, M.、Naito, K.、Kanno, K.：“船津剪切带的重新检查”。