granitic activities and origin of the Kamioka-type Pb-Zn deposits in the Hida complex, Japan.

日本飞弹杂岩神冈型铅锌矿床的花岗岩活动和成因。

• 批准号: 03640645
• 负责人: KANO Takashi
• 金额: $ 1.02万
• 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: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03640645/
• 关键词: Hida complex; Granite; Kamioka mine; Skarn deposit; Migmatite; 鉛・亜鉛鉱床

The project plans to obtain basic geological and petrological data for granitic rocks in the Hida complex, and focuses the problem, what granitic activity is responsible for the origin of Kamioka-type Pb-Zn deposits. The results obtained are;(1) Clinopyroxene-bearing migmatite, the most common country rocks of the deposits, has been considered to relate to the mineralization, but the compositions of clinopyroxenes are mainly controlled by the bulk chemistry of rocks and have no systematic relation with the distribution of ore deposits. The migration of iron accompanied by mineralization is limited in narrow zones near orebodies.(2) Early Mesozoic granites are most widespread in the complex, and have long been believed that they are homogeneous in chronology and lithology called totally "Funatsu granites" of the Jurassic age. The detailed field observations, however, clarified that: (a) they can be divided into two stages: the older Triassic granites and younger Jurassic ones, (b) the older Funatsu granites have been partly deformed and metamorphosed to be augen gneiss and recrystallized by the thermal effect of the younger Shimonomoto granite, (c) the older granites can be correlated with the Indosinian granites and the younger ones with the Yenshanian granites of the Asian continent, and this means that the Hida granites involve the turning point of granitic activities from late Paleozoic to Mesozoic in the eastern margin of the continent.

该项目计划获取希达杂岩体中花岗岩的基本地质和岩石学数据，并重点研究什么样的花岗岩活动是造成神冈型铅锌矿床的原因。得到的结果是：（1）含单斜辉石混合岩是矿床最常见的围岩，一直被认为与成矿有关，但单斜辉石的成分主要受岩石的整体化学控制，与矿床的分布没有系统的联系。矿化过程中铁的迁移局限于矿体附近的狭窄地带。(2)早中生代花岗岩在杂岩中分布最广，长期以来一直认为它们在年代学和岩性上都是均一的，被称为侏罗纪时代的“船津花岗岩”。然而，详细的实地观察澄清：（a）它们可分为两个阶段：（B）较老的船津花岗岩在较年轻的下野本花岗岩的热作用下，部分变形变质为眼球状片麻岩，再结晶，（c）较老的花岗岩可与印支期花岗岩对比，较年轻的花岗岩可与亚洲大陆燕山期花岗岩对比，这意味着希达花岗岩是大陆东缘晚古生代至中生代花岗岩活动的转折点。

项目成果

Kano T. and Shimizu M.: "Mineral deposits and magmatism in the Hida and Hida marginal belts, central Japan. 29th IGC field trip guide book, vol. 6, 101-141" Resource Geology Soc.(1992)

Kano T. 和 Shimizu M.：“日本中部飞驒和飞騨边缘带的矿床和岩浆作用。第 29 届 IGC 实地考察指南，第 6 卷，101-141”资源地质学会（1992 年）

加納 隆: "飛騨変成帯の球状岩とミグマタイト" 松本〓夫教授記念論文集. 313-319 (1992)

Takashi Kano：“飞驒变质带中的球状岩石和混合岩”松本教授纪念论文集313-319（1992）。

加納 隆: "飛騨変成帯の球状岩とミグマタイトー松本征夫教授退官記念論文集ー" 松本征夫教授退官記念会, (1992)

鹿野隆：《飞弹变质带的球状岩和混合岩。纪念松本幸雄教授退休论文集》，松本幸雄教授退休纪念晚会，（1992）

KANO, T.: "Composional variation of clinopyroxenes in so-called Inishi migmatite and skarn ore in and around the Kamioka mining area,Japan." Mining Geology. 42. (1992)

KANO, T.：“日本神冈矿区及周边地区所谓的 Inishi 混合岩和矽卡岩矿石中单斜辉石的成分变化。”

加納 隆: "飛騨帯の変成閃緑岩ー斑れい岩複合体" 日本地質学会第99年学術大会(熊本)講演要旨. (1992)

Takashi Kano：“飞驒带的变质闪长岩杂岩”日本地质学会第 99 届年会摘要（熊本）（1992 年）。