Petrochemical Studies on the Cretaceous Granite of Inner Belt of Southwest Japan in the East Side to Fossa Magna

西南日本内带大窝东侧白垩纪花岗岩的岩石化学研究

• 批准号: 62540625
• 负责人: HAYAMA Yoshikazu
• 金额: $ 0.96万
• 依托单位: Tokyo University of Agriculture
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1987
• 资助国家: 日本
• 起止时间: 1987 至 1989
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-62540625/
• 关键词: granite; chemical composition; zonal distribution; 山陽帯; 化学成分

Summary of research results; The objects of this project are as follows; (1) The granite area of the Inner Belt of Southwest Japan is divided into three zones, that is, the Ryoke zone, the San-yo- Naegi zone and the San-in - Shirakawa zone. In this case, how are these zones extended on the east side of Fossa Magna?, (2) The chemical composition of granite in each zone is compared and discussed.About the first theme, the followings have been made clear; (1)Three zones are extended on the east side of Fossa Magna. (2)The Ryoke zone is situated on the northern margin of the Kanto Mountains to the southern end of Mt. Tsukuba, but granite, except a small part, is belonging to the extension of the San-yo -Naegi zone. Gneissose granite of Mt. Tsukuba, which has been considered to be the older Ryoke granite, has no hornblende and has generally muscovite. Such a granite is not detectable in the Ryoke zone. (3) The boundary between the Ryoke and the San- yo - Naegi zones is roughly located on the southern side of the Ashio Mountains.In this zone, the tangusten mineralization is seen in Itani of Tochigi Pref. and Takatori of Ibaraki Pref. Also in this zone, there is common the Mannari type of granite, which shows reddish color by much pink potash feldspar. (4) The boundary of the San-yo - Naegi zone to the San-in - Shirakawa zone is roughly located near the Okutadami Dam. In this zone, some bodies of granite belong to the magnetite series and to the Paleogene granite. Moreover, the molibdenum mineralization is known in Tagokura of Fukushima Pref., in Nippo of the Iide Mountains and in Nishitagawa of Yamagata Pref.

研究成果摘要;本项目的研究对象如下：（1）将日本西南部内带花岗岩区划分为三个带，即：良屋带、山阳内木带和山阴白川带。在这种情况下，这些区域是如何在大窝的东侧延伸的？(2)通过对各带花岗岩化学成分的对比和讨论，明确了第一个主题：（1）在大窝东侧延伸出三个带;（2）Ryoke带位于关东山脉的北方边缘，在关东山脉的南端。筑波，但花岗岩，除了一小部分，是属于延伸的山阳内木地带。山的片麻状花岗岩。筑波被认为是更古老的Ryoke花岗岩，没有角闪石，通常有白云母。这样的花岗岩在Ryoke区是检测不到的。(3)在芦潮山脉的南侧，大致有两个带的分界线。在该带中，在栃木县的板谷和茨木县的高取，可以看到角闪石矿化。在该带中，还常见Mannari型花岗岩，它由许多粉红色钾长石显示出红色。(4)从山阳内木到山阴白川的边界大致位于奥田见大坝附近。在这一带，有些花岗岩体属于磁铁矿系列和古近系花岗岩。此外，在福岛县的田戈仓发现了钼矿化，在饭出山的日保和山形县的西多川，

项目成果

端山好和 ほか: "群馬県下仁田町の川井山石英閃緑岩の放射年代とその意味" 日本地質学会第94年学術大会講演要旨. (1987)

Yoshikazu Hayama等：“群马县下仁田町川山石英闪长岩的辐射年龄及其意义”日本地质学会第94届学术会议摘要（1987年）。

端山好和(Yoshikazu Hayama): "Pre-Jurassic basement metamorphic rocks in the Inner Belt of Southwest Japen" Structural Development of the Japanese Islands:Origin of continental crust DELP publication. no.28. 39-41 (1989)

Yoshikazu Hayama：“日本西南内带的前侏罗纪基底变质岩”，日本列岛的构造发展：大陆地壳的起源 DELP 出版物，第 28 期（1989 年）。

Yoshikazu Hayama, et al.: "The radiometric ages of guartz diorite in Mt. Kawaiyama of Shimonita" Gunma Pref. Abstract in the 94th. meeting of Geological Society of Japan (1987).

Yoshikazu Hayama等人：“下田河合山石英闪长岩的放射性年龄”群马县。

Yoshikazu Hayama: "Pre-Jurassic basement metamorphic rocks in the Inner Belt of Southwest Japan" DELP Publication no. 28, Structural Development of the Japanese Islands: Origin of Continental Crust (1989).

Yoshikazu Hayama：“日本西南部内带的前侏罗纪基底变质岩”DELP 出版物第 10 号。

Yoshikazu Hyama: "Pre-Jurassic Paleo-Ryoke land in Southwest Japan" Monthly Chikyu, no.7-8 (1990).

Yoshikazu Hyama：“日本西南部的前侏罗纪古Ryoke土地”，地球月刊，第7-8期（1990年）。