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

本研究项目已满三年，并按计划取得了不少成果。1.K.Chijiwa和Y.Nishimura研究了一种利用Leitz MPV-Comp-2测量泥质变质岩中煤和碳质物质的反射率的方法，并确定了适当的测量方法。部分结果已在SOC会议上报告。应用煤炭石油.日本(1996)，K.Chijiwa.Y.Nishimura对日本西南部的几个增生杂岩进行了地质调查，并测定了大量的碳质物质数据和重结晶凤晶云母的K-Ar年龄。清山地区的一份结果于7月打印出来。日本地质学(1995)和池仓地区构造变质作用(1996)。《变质地质学》(1998)发表了一篇题为《三郡带大地构造分区与面积范围》的论文。来自琉球中部弧线的结果将得到更全面的检验，并在不久的将来发表。T.Imaoka和Y.Nishimura在Geol会议上报告了来自Susa地区的结果。Soc.Japan(1996)，并刊载于《石油地质杂志》(1997)。他们还对分布在琉球弧中部的许多小花岗岩进行了地质和岩石学调查，并测定了黑云母和角质混合岩的10个K-Ar年龄。这也将得到更全面的审查，并在不久的将来出版。T.Itaya与Y.Nishimura和T.Imaoka合作测量了大量K-Ar数据。他在《岛弧》(1996)上发表了题为《基于生物地层学和K-Ar年代学的米诺-坦巴带西部侏罗纪增生杂岩的幕式增生和变质作用》等论文。Y.Nishimura和T.Itaya已经从新西兰的一些吸积杂岩中获得了良好和完整的数据。这项研究正在撰写中，不久就会发表。

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.