Minute examination of metamorphic and restite-formation processes in the Island-arc and continental lower crusts

岛弧和大陆下地壳变质和复位矿形成过程的详细检查

• 批准号: 09440176
• 负责人: OSANAI Yasuhito
• 金额: $ 9.34万
• 依托单位: OKAYAMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09440176/
• 关键词: Ultrahigh-T metamorphism; Partial melting; Restite; Isotopic age; Spinel + Quartz; Sapphirine granulite; Gondwana supercontinent; Napier Complex; 肥後変成帯; 黒瀬川帯; スリランカ; サフィリン+石英; 斜方輝石+珪線石; 日高変成帯; High-T netrinorphic rock; Partial Melting; Gra

The main focus of this research program was the minute study of metamorphic and restiteformation processes among the island-arc and continental type lower crusts as seen the high-and ultrahigh-temperature metamorphic terrane in Japan (Hidaka metamorphic belt, Higo metamorphic terrane and Kurosegawa belt) and in Gondwana fragments (Antarctica, Sri Lanka and India).For the domestic high-and ultrahigh-temperature metamorphic terranes, garnet-orthopyroxene granulite and sapphirine-bearing granulite from the Hidaka and Higo terranes were re-examined to understand the process of restitic natures and related granitic magma genesis. Especially in the Higo terrane, the high-grade metamorphic rocks compared with East Asian regional metamorphic rocks through the geological, petrological and geochronological investigations. Another metamorphic and chronological studies also carried out for the Kurosegawa belt in Kyushu. The results include the finding of UHT-mafic granulite up to 950℃ and 1000MPa … More and Pan African age of 540Ma using Um-Nd whole rock isochron.Antarctica, Sri Lanka, and India as the Gondwana fragments were also treated. The most detailed geological mapping for the Archean high-grade metamorphic terrane have done at Tonagh Island in the Napier Complex, East Antarctica. After the completion of the geological map, detailed investigations of metamorphic process of YHT-metamorphic rocks including P-T-t path analyses and variety on the origin of sapphirine granulites were also carried our In Sri Lanka, characteristic spinel+quartz coexistence was newly found. It shed a light on the evolution of Sri Lankan basement rocks with studies of Sm-Nd geo chronology. And during the examination of partial melting process of high-grade metamorphic rocks in Eastern Ghats, India, new magmatic charnockites (C-type) and their isotopic ages were clearly identified.A part of the results were published as 31 articles of journal papers and 37 oral and poster presentations, not only domestic but also international meetings. Less

该研究计划的主要重点是详细研究岛弧型和大陆型下地壳中的变质作用和残积岩的形成过程，如日本的高温和超高温变质作用（日高变质带、日后变质带和黑濑川变质带）和冈瓦纳大陆碎片（南极洲、斯里兰卡和印度）。对于国内的高温和超高温变质岩石，对产于日高和日后岩的石榴斜方辉石麻粒岩和含菱辉石麻粒岩进行了重新研究，以了解残橄岩的性质和相关的花岗岩岩浆成因过程。通过地质学、岩石学和年代学研究，将东后江高级变质岩与东亚区域变质岩进行了对比。对九州黑濑川带进行了变质作用和年代学研究.在950℃和1000 MPa的压力下，发现了超高温镁铁质麻粒岩 ...更多信息 用Um-Nd全岩等时线法测得泛非年龄为540 Ma，并将南极洲、斯里兰卡和印度作为冈瓦纳大陆的碎片进行了处理。东南极洲纳皮耶杂岩中的托纳岛已完成了太古代高级变质岩石最详细的地质填图。在完成地质填图后，对YHT-变质岩的变质过程进行了详细的研究，包括P-T-t轨迹分析，并对斯里兰卡麻粒岩的成因进行了研究，在斯里兰卡发现了尖晶石+石英的特征共存，通过Sm-Nd年代学研究，对斯里兰卡基底岩石的演化提供了新的认识。在对印度东高止山脉高级变质岩部分熔融过程的研究中，明确识别出新的岩浆碳辉岩（C型）及其同位素年龄，部分成果以31篇期刊论文和37篇口头及海报报告的形式发表在国内外会议上。少

项目成果

Kusachi,I.et al.: "Mineralogy of scapolite from Skallen in the Lutzow-Holm Bay, East Antarctica"Polar Geosci.. 12. 143-156 (1999)

Kusachi,I.et al.：“东南极洲 Lutzow-Holm 湾 Skallen 的方柱石矿物学”Polar Geosci.. 12. 143-156 (1999)

Yoshida,M.et al.: "Field studies of Proterozoic terrains in peninsular India and Sri Lanka during 1997-1998"Jour.Geosci.Osaka City Univ.. 42. 179-203 (1999)

Yoshida,M.et al.：“1997-1998 年印度半岛和斯里兰卡元古代地形的实地研究”Jour.Geosci.Osaka City Univ.. 42. 179-203 (1999)

Osanai,Y.et al.: "The Higo high-grade metamorphic rocks in Japan as a part of the collisional terrane between the Sino-Korean and Yangtze cratons"Gondwana Research. 2. 599-601 (1999)

Osanai，Y.et al.：“日本肥后高级变质岩是中朝克拉通和扬子克拉通碰撞地体的一部分”冈瓦纳古陆研究。

Osanai,Y.et al.: "Geological fieldwork of the southwestern and central part of the Highland Complex, Sri Lanka during 1998-1999, with special reference to the highest-grade metamorphic rock"Jour.Geosci.Osaka City Univ.. 43(印刷中). (2000)

Osanai,Y.et al.：“1998-1999 年斯里兰卡高原杂岩体西南和中部的地质实地考察，特别提到最高品位的变质岩”Jour.Geosci.Osaka City Univ.. 43 （正在出版）。

Owada,M.et al.: "Rb-Sr 250chron ages for hornblende tonalite from the" Memoir Geol.Soc.Japan. 47. 21-27 (1997)

Owada,M.et al.：“《Memoir Geol.Soc.Japan》中角闪石英云闪石的 Rb-Sr 250chron 年龄。