Time-Space of the evolution of the Hida metamorphic rocks based on CHIME age

基于CHIME年龄的飞弹变质岩演化时空分析

• 批准号: 10640435
• 负责人: SOHMA Tsuneo
• 金额: $ 2.3万
• 依托单位: Toyama University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 2000
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10640435/
• 关键词: CHIME; U-Th-Pb chemical age; Hida metamorphic belt; Hida metagranitoid; Funatsu granitoid; Unazuki metamorphic belt; zircon; uraninite; 飛騨変成岩類; 宇奈月変成岩類; 飛騨変成作用; CHIME年代; SHRIMP年代; モナザイト; 大陸; 変動帯

The time and space of the evolution of the Hida metamorphic belt were studied on the basis of U-Th-Pb chemical age (CHIME age) of zircon, monazite, uraninite and thorite. This study is an extention of the petrological studies of the Hida metamorphic rocks (Sohma et al., 1995), in which mother-daughter relationships (relative age relationship) of various rock types were determined. The followings are the major conclusions of this study.1 CHIME age of U-Th-Pb minerals of a collision type metamorphic belt were controled by hydrothermal reactions rather than closure temperature of the minerals.2 The majority of the so called Jurassic Funatsu granitoids show Carboniferous to Permian zircon ages in origin, and possess monazite and uraninite of the Hida metamorphic age of 240Ma. They are metamorphic rocks, and will be called the Hida metagranitoids.3 The Unazuki metamorphic belt is not a separate one, but has been developed as a part of the Hida metamorphic belt, because of the association of the Unazuki metamorphic rocks and the Hida metagranitoids.4 The Hida metamorphic belt is a polymetamorphic orogen, but its lithology were finally formed at about 270Ma.5 The Hida metamorphism started with subduction zone granitic magmatism at about 270Ma, showed a thermal peak followed by a hydrothermal event in which uraninite of 240Ma age crystallized, and continued to the uplift and cooling of the metamorphic belt as indicated by K-Ar ages of hornblende and biotite.

基于锆石，单济石，铀岩和胸岩的U-TH-PB化学年龄（循环年龄），研究了HIDA变质带进化的时间和空间。这项研究是对HIDA变质岩石的岩石学研究的扩展（Sohma等，1995），其中确定了各种岩石类型的母女关系（相对年龄关系）。以下是这项研究的主要结论。1碰撞类型变质带的U-Th-Pb矿物质的循环年龄是由水热反应而不是矿物质的闭合温度控制的。2所谓的侏罗纪funatsu花岗岩类花岗岩表明，对二叠纪国家漫游的碳酸盐含有氧化；它们是变质的岩石，将被称为希达·属植物。大约270mA.5 HIDA变质始于俯冲带Granitic Magmatism，大约为270mA，显示了一个热峰，随后是一个热热事件，在该事件中，脉脉结晶了240mA年龄，并继续升至变质皮带的隆起和冷却，如K-Arage of Hornblende和Biblende和Biblende和Bibblende和Bibblendite和Bibblendite和Bibblendite和Bibblendite。

项目成果

Kunugiza, K.: "Incipient stage of ore formation process of the Kamioka Zn-Pb ore deposit in the Hida metamorphic belt, central Japan : Leaching and precipitation of clinopyroxene."Resource Geol.. Vol.49. 199-212 (1999)

Kunugiza, K.：“日本中部飞驒变质带神冈锌铅矿床成矿过程的初始阶段：单斜辉石的浸出和沉淀。”资源地质.. 第 49 卷。

Kunugiza,K.: "Incipient stage of ore formation process of the Kamioka Zn-Pb ore deposit in the Hida metamorphic belt,central Japan:Leaching and precipitation of clinopyroxene."Resource Geol.. 49. 199-212 (1999)

Kunugiza,K.：“日本中部飞驒变质带神冈锌铅矿床成矿过程的初始阶段：单斜辉石的浸出和沉淀。”资源地质. 49. 199-212 (1999)

Yokoyama K. and Goto A.: "Petrological study of the Upper Cretaceous sandstones in the Izumi Group, southwest Japan."Memoirs of the National Science Museum. 32. 7-17 (2000)

Yokoyama K. 和 Goto A.：“日本西南部泉群上白垩纪砂岩的岩石学研究。”国家科学博物馆回忆录。

Kunugiza,K.: "Incipient stage of ore formation process of the Kamioka Zn-Pb ore deposit in the Hida metamorphic belt, central Japan : Leaching and precipitation of clinopyroxene."Resource Geol.. 49. 199-212 (1999)

Kunugiza,K.：“日本中部飞驒变质带神冈锌铅矿床成矿过程的初始阶段：单斜辉石的浸出和沉淀。”资源地质. 49. 199-212 (1999)

Yokoyama K.and Goto A.: "Petrological study of the Upper Cretaceous sandstones in the Izumi Group, southwest Japan."Memoirs of the National Science Museum, Tokyo. 32. 7-17 (2000)

Yokoyama K. 和 Goto A.：“日本西南部泉群上白垩纪砂岩的岩石学研究。”东京国家科学博物馆回忆录。