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Research on Trace Element Contents in Granitoids

花岗岩中微量元素含量研究

基本信息

批准号：
01540667
负责人：
TSUSUE Akio
金额：
$ 1.02万
依托单位：
Kumamoto 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 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-01540667/
关键词：
Outer Zone of Southwest Japan I-type granitoids S-type granitoids Mineral assemblage Butsuzo Tectonic Line Middle Miocene Omine district, Kii peninsula Takatsukiyama 花こう岩類 REEパタ-ン SrーRb図 BaーRb図 Eu異常ジュラ紀花こう岩類飛騨変成帯韓国中新世花こ

项目摘要

The Outer Zone granitoids have been divided into two groups, namely, 1- and S-types. The granitoids occurring in the northern part of the Butsuzo Tectonic Line of the Outer Zone of Southwest Japan tend to have I-type characteristics, and S-type granitoids are generally restricted to the south. In addition to I- and S-type discrimination, some geochemical variations have been observed : K_2O, total Fe and normat6ive corundum increase toward the pacific side, while Fe_2O_3/FeO* (total Fe as FeO) ratio decreases. In this report we intend to report mineral assemblages of granitoids of the Omine district in the Kii peninsula and Takatsukiyama pluton in Shikoku. In the Omine district, granitoids are intermittently found along the trend of NS about 40 km long. The boundary of I- and S-type granitoids is located just about the Butsuzo Tectonic Line. The presence of amphibole is the characteristics of mineral assemblage of I-type granitoids, while the absence of amphibole and occasional presence of cordierite or garnet are the characteristics of S-type granitoids. The IS-type granitoids are found as separated plutons in the Omine district. The Takatsukiyarna pluton in Shikoku is located at 10 km south of the Butsuzo Tectonic Line. The pluton intruded into the Lower Shimanoto Supergroup of the Late Cretaceous age Depending on the field occurrence and mineral assembllage, the Takatsukiyama granitoids have been divided into three major petrographic types, namely, B-, W-C, W-A types. The B-type granitoid is found as a small ovoid body, 1 km X 0.5 km size, completely enclosed in the central part of the w-type body. The B- and W-A type granitoids belong to I-type, while the W-C type granitoids belong to S-type. The presence of the Land S-type granitoids within a single pluton is a characteristics of the pluton, and that must be the problem to solve.

外带花岗岩可分为1型和S型两大类。产于日本西南部外带布津构造线北方的花岗岩类倾向于具有I型特征，S型花岗岩类一般局限于南部。除I型和S型判别外，还观察到一些地球化学变化：K_2O、全Fe和标准铁含量向太平洋一侧增加，Fe_2O_3/FeO*（全Fe以FeO计）比值降低。本文报道了纪伊半岛大峰地区和四国高筑山岩体的花岗岩类矿物组合。在Omine地区，沿沿着约40 km的南北走向断续发现花岗岩类。I型和S型花岗岩类的边界位于布津佐构造线附近。角闪石的存在是I型花岗岩的矿物组合特征，而角闪石的缺失和堇青石或石榴石的偶见是S型花岗岩的特征。IS型花岗岩类是在Omine地区发现的分离岩体。四国的Takatsukiyarna岩体位于Butsuzo构造线以南10公里处。根据野外产状和矿物组合特征，将高筑山花岗岩类划分为B-型、W-C型和W-A型三种主要岩石学类型。B型花岗岩是一个大小为1 km × 0.5km的小卵形体，完全封闭在W型岩体的中部。B型和W-A型花岗岩属I型，W-C型花岗岩属S型。单个岩体中存在陆S型花岗岩是该岩体的一个特征，这是必须解决的问题。