Study on the material cycle through accretionary prism, boundary between ocean and continent

通过吸积棱镜、海洋与大陆边界研究物质循环

• 批准号: 05452087
• 负责人: TAKASU Akira
• 金额: $ 5.5万
• 依托单位: Shimane University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (B)
• 财政年份: 1993
• 资助国家: 日本
• 起止时间: 1993 至 1994
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-05452087/
• 关键词: accretionary prism; high-pressure type metamorphic rocks; Sambagawa metamorphic belt; P-T path; garnet; zoning; geochronology; 物質循環; 累進変成作用; P-T-t経路

Research of geology and geologic structure has been done in the Sambagawa metamorphic belt, as a typical example of high-pressure type metamorphic belt, in Shikoku, Kii Peninsula, Chubu and Kanto, and rock samples for petrological and geochronological studies have been collected there. Observation of backscattered electron images and chemical analyzes of constituent minerals by the EDS,and P-T paths of the high-pressure type metamorphic rocks have been revealed. Crystal structure of carbonaceous and organic matters within the sedimentary rocks, which were derived from shallow portions of accretionary prism, were analyzed by using X-ray diffraction meter and mass spectrometer. 40Ar/39Ar dating for muscovite concentrates obtained from the Sambagawa schists in Kii Peninsula, and well-defined plateau ages of 75-77 Ma are recorded in the muscovite concentrates. According to the results obtained from this research project the sedimentation and metamorphic evolution in accretionary prism and related areas have been discussed with special reference to the material cycle.

对四国、纪伊半岛、中部、关东等地的高压型变质带典型的三波川变质带进行了地质和地质构造研究，采集了用于岩石学和年代学研究的岩石样品。通过EDS背散射电子像观察和成分矿物化学分析，揭示了高压型变质岩的P-T路径。利用X射线衍射仪和质谱仪对来自增生棱柱浅部的沉积岩中的碳质和有机质的晶体结构进行了分析。对从纪伊半岛三波川片岩中获得的白云母精矿进行了 40Ar/39Ar 测年，白云母精矿中记录了明确的 75-77 Ma 高原年龄。根据该研究项目获得的结果，特别参考物质循环，讨论了吸积棱柱及相关区域的沉积和变质演化。

项目成果

Dallmeyer, R.D., Takasu, A.and Yamaguchi, K.: "Mesozoic tectonothermal development of the Sambagawa, Mikabu and Chichibu belts. southwest Japan : evidence from 40Ar/39Ar whole-rock phyllite ages." J.Metamorphic Geol.13. 271-286 (1995)

Dallmeyer, R.D.、Takasu, A. 和 Yamaguchi, K.：“Sambakawa、Mikabu 和 Chichibu 带的中生代构造热发育。日本西南部：来自 40Ar/39Ar 全岩千枚岩年龄的证据。”

Takasu, A., Wallis, S.R., Banno, S.and Dallmeyer, R.D.: "Evolution of the Sambagawa metamorphic belt, Japan." Lithos. 33. 119-133 (1994)

Takasu, A.、Wallis, S.R.、Banno, S. 和 Dallmeyer, R.D.：“日本桑巴川变质带的演化”。

Takasu,A.: "Resorption-overgrowth garnets from the Sambagawa pelitic schists in the Besshi district,central Shikoku,Japan" Earth Science. 48. 8-13 (1994)

Takasu,A.：“日本四国中部别子地区三波川泥质片岩中的再吸收过度生长石榴石”地球科学。

Akasaka,M.: "Mineralogy of piedmontite-bearing schist in the Yamagami metamorphic rocks of northeastern Abukuma plateau." Journal of Mineralogy,Petrology,and Economic Geology. 88. 141-156 (1993)

Akasaka,M.：“阿武隈高原东北部山上变质岩中含山前岩片岩的矿物学。”

Takasu,A.: "Resorption-overgrowth garnets from the Sambagawapelitic chists in the Besshi district,central Shikoku,Japan" Earth Science. 48. 8-13 (1994)

Takasu,A.：“日本四国中部别子地区三波川泥质岩中的再吸收过度生长石榴石”地球科学。