Study on the Tertiary Volcanic Rocks in the Izu-Mariana Arc

伊豆-马里亚纳岛弧第三纪火山岩研究

• 批准号: 01540660
• 负责人: SHIRAKI Keiichi
• 金额: $ 1.09万
• 依托单位: Yamaguchi University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1989
• 资助国家: 日本
• 起止时间: 1989 至 1990
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01540660/
• 关键词: Volcanic rocks; Andesite; Boninite; Sanukite; Island arc; Izu-Mariana arc; Bonin Islands; Setouchi volcanic belt; 讚岐岩; 瀬戸内火山岩; 無人岩(ボニナイト); 島弧ソレアイト; ソレアイト; 岩石字; Volcanic rocks; Andesite; Boninite; Sanukite; Island arc; Izu-Mariana arc; Bonin Islands; Setouchi volcanic belt; 讚岐岩; 瀬戸内火山岩; 無人岩(ボニナイト); 島弧ソレアイト; ソレアイト; 岩石字

1. Study on the Tertiary volcanic rocks in the Bonin Islands.(1) Sheeted dike complex at Ishi-ura on the east coast of Chichi-jima.The dikes and associated pillow lavas are composed mainly of clioenstatite-bearing boninites, which are the most primitive and undifferentiated among the Bonin Island boninites. This confirms the early suggestion that the parallel dike swarm on Ishi-ura, located at the lowest of the pillow lava sequences in Chichi-jima, represents a part of the sheeted dike complex common in many ophiolites.(2) Augite boninites in the Tatsumiwan area of southeastern Chichi-jima.The augite boninites contain augite phenocrysts attaining the highest Mg value 89.3, most magnesian so far reported from the Bonin Island boninites. These rocks crystallized augite prior to orthopytoxene and belong to cpx-HMA, which is the first discovery from the Bonin Island boninites.(3) Island arc tholeiites similar to those occurring in Haha-jima in chemistry were discovered on John Beach in southwestern Chichi-jima.2. Comparative study on boninites and other magnesian andesites.(1) Trace elements in the Tertiary volcanic rocks from western Setonaikai.The Setouchi magnesium andesites have remarkably high Rb, while Sr is rather low. The Setouchi volcanic rocks form by addition of water containing Rb, K, Ba and Zr, as well as boninites.(2) Sanukitoids quite identical with the Setouchi sanukitoids in chemical and mineral compositions were discovered in Choshi of eastern Honshu Nagasaki of western Kyushu.

1。研究波宁群岛的第三纪火山岩。（1）奇奇 - 吉玛（Chichi-Jima）东海岸的伊什乌拉（Ishi-ura）的薄堤板层。堤防和相关的枕头熔岩主要由粘膜静态的锁骨组成，是由氯尼植物的bolo地组成的，这是波宁岛boninites中最原始的，最原始的和未分化的。这证实了早期的建议，即位于Chichi-jima的枕头熔岩序列最低的Ishi-ura上的平行堤防代表了许多蛇绿岩的一部分。迄今为止，木诺岛报道了Bonin Island Boninites。这些岩石在邻苯二酚之前结晶的岩石，属于CPX-HMA，这是Bonin Island boninites的第一个发现。（3）在Chichi-Jima.2的John Beach上发现了与Haha-jima相似的Island Tholeiites。 （1）来自西部Setonaikai的第三纪火山岩中的痕量元素。SetouchiAndesites的痕量元素具有很高的RB，而SR相当低。 Setouchi火山岩通过添加含有RB，K，BA和ZR的水以及牙岩形成。（2）在Kyushu西部荷兰州东部的Choshi中发现了与Setouchi Sanukitoid在化学和矿物质成分中完全相同的Sanukitoid。