Metamorphic history of the lower crust, in the east end of the SW Japan Arc

西南日本弧东端下地壳的变质历史

• 批准号: 14540420
• 负责人: SHIMURA Toshiaki
• 金额: $ 1.86万
• 依托单位: NIIGATA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-14540420/
• 关键词: Uetsu area; granite; metamorphism; UHT; granulite; Cretaceous; Ryoke Belt; lower crust; 西南日本; 棚倉構造線; ゼノリス; 部分融解; 西南日本弧; 同位体岩石学; 変成岩; スピネル+石英

Plutonic and volcanic rocks of Cretaceous to Paleogene age are widely distributed in the Uetsu area, northern Japan. These plutonic suites have been emplaced into the Ashio Belt, a pre-Cretaceous accretionary complex. The correlation between the Uetsu area and the SW Japan is still in discussion. The purpose of this study is to make clear the metamorphic history of this area.The main results are as follows.Metamorphic grade of the Sumikawa xenoliths is from amphibolite facies to granulite facies. The metamorphic P-T-t path is clockwise.Awataki metamorphics can be subdivide to peraluminous granite origin and pelitic-psammitic rock origin. Two stages metamorphism can be recognized, the first stage is regional metamorphism and the second is contact metamorphism. Both of these are amphibolite facies.Metamorphic grade of the Iide metamorphics is amphibolite facies.The Sumikawa xenoliths and Awataki meramorphics are the source rocks of the Cretaceous granite. The lower most crust of the Uetsu area reached to the ultrahigh-temperature metamorphism. The metamorphic rocks and Cretaceous plutonic rocks of the Uetsu area are thought to be the Ryoke-Belt. On the other hand Paleogene igneous rocks are correlated to the Sanin-Belt.

日本北部的上津地区广泛分布着白垩纪至古近纪的深成岩和火山岩。这些深成套被安置在阿什欧带，一个前白垩纪增生杂岩。上津地区与日本西南部的相关性仍在讨论中。本研究旨在厘清该区的变质史。主要结果如下：住川捕虏体的变质品位由角闪岩相向麻粒岩相转变。变质的P-T-t路径是顺时针的。洼崎变质岩可细分为过铝花岗岩成因和泥质-沙质岩成因。变质作用可分为两个阶段，第一阶段为区域变质作用，第二阶段为接触变质作用。两者均为角闪岩相。Iide变质岩的变质等级为角闪岩相。住川包体和阿瓦塔基变质岩是白垩纪花岗岩的烃源岩。禹津地区最下部地壳达到了超高温变质作用。禹津地区的变质岩和白垩系深成岩被认为是良带。另一方面，古近系火成岩与三宁带相对应。

项目成果

Kawabata, H.: "Quantitative analysis of rock-forming minerals using the energy-dispersive X-ray spectrometer"Sci.Rep.Niigata Univ., Ser.E.. 18(印刷中). (2004)

Kawabata, H.：“使用能量色散 X 射线光谱仪对成岩矿物进行定量分析”Sci.Rep.Niigata Univ.，Ser.E.. 18（印刷中）。

Owada, M.: "Crustal section and anatexis of lower crust due to mantle flux in the Hidaka metamorphic belt, Hokkaido, Japan"Geol.Surv.Japan, Interim-Rep.. 28. 81-102 (2003)

Owada, M.：“日本北海道日高变质带地幔通量导致的下地壳剖面和深熔”Geol.Surv.Japan，Interim-Rep.. 28. 81-102 (2003)

Shimura Toshiaki: "The Origin of Granites and Related Rocks, Field Guidebook, Geol.Surv.Japan, Interim-Rep."Geological Survey of Japan. 134 (2003)

Shimura Toshiaki：“花岗岩和相关岩石的起源，实地指南，Geol.Surv.Japan，临时报告”日本地质调查局。

Shimura Toshiaki: "Granulite Xenoliths from the Sumikawa Granite Body, Niigata Prefecture, Japan : Finding of Spinel + Quartz Assemblage from the Japanese Islands"Journal of the Geological Society of Japan. 108. 347-350 (2002)

志村俊明：“来自日本新泻县隅川花岗岩体的麻粒岩包体：在日本列岛发现尖晶石石英组合”，日本地质学会杂志。

Quantitative analysis of rock-forming minerals using the energy-dispersive X-ray spectrometer

使用能量色散 X 射线光谱仪定量分析造岩矿物

• 发表时间: 2004
• 期刊: Sci.Rep.Niigata Univ.,Ser.E. 19
• 作者: Kawabata;H.;Shimrua;T.;Sato;M.
• 通讯作者: M.