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Low-grade metamorphism and K-Ar ages of several accetionary complexes in Southwest Japan

日本西南部几个增生杂岩的低级变质作用和 K-Ar 年龄

基本信息

批准号：
07454121
负责人：
NISHIMURA Yujiro
金额：
$ 5.12万
依托单位：
Yamaguchi University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07454121/
关键词：
crystallinity of carbonaceous material reflactanc of carbonaceous material metamorphic history of accretionary complexes in Southwest Japan K-Ar ages of recrystallized phengitic mica geotectonic subdivision of accretionary complexes in Middle Ryuk

项目摘要

This study has expired the term of our project for three years, and gotten much results according to plan. Abstracts of our project are as follows :1. K.Chijiwa and Y.Nishimura have examined a method of reflactance measurment of coals and carbonaceous material from pelitic metamorphic rocks using a Leitz MPV - Compact 2, and established the proper measures. A part of the results was reported at the meeting of Soc. Appl.Coal Petrol.Japan (1996) by K.Chijiwa.2. Y.Nishimura has geologically surveyed several accretionary complexes in Southwest Japan, and measured a lot of d_<002> data of carbonaceous material and K-Ar ages of recrystallized phengitic mica. A result from the Kiyama area was printted in Jour. Geol.Soc.Japan (1995), and that from the Ikura area in Tectonics and Metamorphism (1996), respectively. A paper entitled "Geotectonic subdivision and areal extent of the Sangun belt" was appeared in J.Metamorphic.Geol.(1998). Results from the Middle Ryukyu Arc will be examined more fully, and published in near furture.3. T.Imaoka and Y.Nishimura reported a result from the Susa area at the meeting of Geol. Soc.Japan (1996), and printed it in Jour.Min.Petrol.Econ.Geol.(1997). They also have geologically and petrologically surveyed many small granitic bodies scattered in the Middle Ryukyu Arc, and measured 10 K-Ar ages of biotite and hornblend. This will be also examined more fully, and published in near furture.4. T.Itaya has measured a lot of K-Ar data in cooperation with Y.Nishimura and T.Imaoka. He published a papers entitled "Episodic accretion and metamorphism of Jurassic accretionary complexes based on biostratigraphy and K-Ar geochronology in the western part of the Mino-Tanba Belt" in The Island Arc (1996) and so on.5. Y.Nishimura and T.Itaya have obtained excellent and full data from some accretionary complexes in New Zealand. This study is going to write now, and will be published before long.

本研究已经过了三年的项目期限，并按计划取得了不少成果。我们的项目摘要如下：K.Chijiwa和Y.Nishimura研究了一种用Leitz MPV - Compact 2测量泥质变质岩中煤和碳质物质反射率的方法，并建立了适当的测量方法。在Soc会议上报告了部分结果。达成。煤炭汽油。《日本》（1996），作者：池泽谦。yy . nishimura对日本西南部的几个增生杂岩进行了地质调查，并测量了大量的碳质物质的d_<002>数据和再结晶辉生云母的K-Ar年龄。Kiyama地区的结果是在日刊上印刷的。日本地质学会（1995）和伊库拉地区的构造与变质学（1996）。《变质岩学报》（1998）发表了“三关带大地构造分区与面积范围”一文。中琉球弧的研究结果将在不久的将来进行更全面的研究，并发表。T.Imaoka和Y.Nishimura在Geol会议上报告了Susa地区的结果。Soc。日本（1996），载《石油学报》（1997）。他们还对散布在中琉球弧的许多小花岗岩体进行了地质和岩石学调查，并测量了黑云母和角砾岩的10 K-Ar年龄。这也将进行更全面的研究，并在不久的将来发表。itaya先生与西村先生和今冈先生合作测量了大量的K-Ar数据。在《the Island Arc》（1996）等发表论文《基于生物地层学和K-Ar年代学的米诺-滩坝带西部侏罗系增生杂岩的幕式增生与变质作用》。Y.Nishimura和T.Itaya从新西兰的一些增生复合体中获得了出色而完整的数据。这项研究现在就要写了，不久就会发表。