Correlation of Late Permian basement rocks in the eastern margin of Asian continent on the basis of the CHIME dking

基于CHIME dking的亚洲大陆东缘晚二叠世基底岩对比

• 批准号: 12640442
• 负责人: SUZUKI Kazuhiro
• 金额: $ 2.75万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12640442/
• 关键词: CHIME dating; Monazite; Korean Peninsula; Metamorphic rocks; Geochronology; Higo metamorphic belt; Denudation history; Gyonggi massif; 変成帯の削剥上昇; CHIME ages; Permian; Korean Peninsula; Japanese Islands; Gyeonggi Massif; Precambrian; Hida bel

Basement rocks in the Japanese Islands and the eastern margin of Asian continent were correlated on the basis of the CHIME dating of accessory monazite and zircon and the XRF analyzes of whole-rock composition. The main results are as follows.(1) Tonalitic clasts in Usuginu conglomerate of the South Kitakami terrane show 258-247 zircon and monazite ages which are are consistent with the Late Permian fossil age. If these ages are taken as representing emplacement ages of the source granitoids, rapid denudation of the source areas must have occurred. Granitoids in the Sikhote-Alin area show CHIME monazite ages of around 250 Ma, and appear to be a likely source ofclasts in the Usuginu conglomerate.(2) Quartzofeldspathic veins in the sillimanite-grade Ryoke paragneiss in the Otowa-Honguusann area, Aichi Prefecture are classified into deformed and ndeformed veins. Deformed veins show boudinage structure, and give CHIME monazite ages of 95-90 Ma. Undeformed veins are discordant with a clear- … More cut boundary, and give 86-77 Ma monazite age. The ages coupled with the deformation pattern of veins suggest that the metamorphic rocks in the area had been uplifted from the ductile deformation condition to the brittle deformation conditions during the period of 90-86 Ma.(3) CHIME dating of granitoids in southeastern China disclosed that the middle to late Jurassic granites are prominent throughout the inland area including Huangshan and Wugongshan, whereas the middle Cretaceous granites are distributed mainly in the coastal region.(4) A granite clast from the Tsukiyozawa conglomerate shows 178+/-3 Ma CHIME monazite ages. This is the first authenticated document to unveil the existence of the Jurassic granitoid from the Jurassic intraformational conglomerate in the Mino terrane, and provides a clearer clue to the Mesozoic source rock for clastic rocks of the terrane.(5) The Sosan granite gneiss shows 1.72 Ga CHIME zircon age. It has long been considered to be a intrusion emplaced into paragneisses in the G^onggi massif. The CHIME dating, however, show monazite and zircon in the paragneiss are much younger that in the Sosan granite gneiss. The paragneisses were folded together with leucogranite veins which give CHIME monazite and zircon ages of c. 250 Ma. This suggests an intense Late Permian metamorphism in Korean Peninsula.(6) Monazite grains in Higo metamorphic rocks are in textural equilibrium with the peak metamorphic mineral assemblage, and are oriented parallel to a strong mineral foliation developed during peak metamorphism. All monazite grains yield CHIME ages of 110-120 Ma. On the basis of the petrographic evidence the monazite ages are interpreted as representing the time of metamorphism and deformation. This conclusion is contrary to studies which suggest that the Higo gneiss formed during the Permian-triassic. Less

根据副独居石和锆石的CHIME定年和全岩成分的XRF分析，对日本列岛和亚洲大陆东缘的基底岩石进行了对比。主要结果如下。(1)南北上海Usuginu砾岩中的英云闪长质碎屑显示258-247锆石和独居石年龄，与晚二叠世化石年龄一致。如果把这些年龄作为源区花岗岩类的侵位年龄，源区必定发生过快速剥蚀。Sikhote-Alin地区的花岗岩类显示出约250 Ma的CHIME独居石年龄，似乎是Usuginu砾岩中碎屑的可能来源。(2)在爱知县大和本州山地区的矽线石级Ryoke副片麻岩中，石英长石质脉被分为变形脉和非变形脉。变形脉体呈石香肠状构造，CHIME独居石年龄为95-90 Ma。不变形的静脉与清晰的- ...更多信息 切割界线，给出独居石年龄为86-77 Ma。年龄和脉体变形模式表明，该区变质岩在90-86 Ma期间经历了由韧性变形到脆性变形的隆升过程。(3)中国东南部花岗岩类CHIME定年结果表明，中晚侏罗世花岗岩主要分布于黄山、武功山等内陆地区，而中白垩世花岗岩主要分布于沿海地区。(4)月代泽砾岩中的花岗岩碎屑显示出178+/-3Ma的CHIME独居石年龄。这是第一份证实米诺河侏罗纪层内砾岩中存在侏罗纪花岗岩类的文件，并为米诺河碎屑岩的中生代烃源岩提供了更清晰的线索。(5)Sosan花岗片麻岩的CHIME锆石年龄为1.72Ga。长期以来，人们一直认为它是侵位于京畿古陆副片麻岩中的侵入体。CHIME测年结果表明，副片麻岩中的独居石和锆石比索山花岗片麻岩中的要年轻得多。副片麻岩与浅色花岗岩脉褶皱在一起，给出了CHIME独居石和锆石年龄为c。250毫安这表明朝鲜半岛晚二叠世发生了强烈的变质作用。(6)独居石颗粒在Higo变质岩的结构平衡与峰变质矿物组合，并在峰变质作用期间开发的强大的矿物叶理平行的方向。所有独居石颗粒的CHIME年龄为110-120 Ma。根据岩石学证据，独居石年龄被解释为代表变质和变形的时间。这一结论与认为Higo片麻岩形成于二叠纪-三叠纪的研究相反。少

项目成果

Dunkley, DJ. And Suzuki, K.: "Petrographically constrained CHIME dating of monazite from the Higo metamorphic terrane, Kyushu, Japan : preliminary results from metapelitic gneiss."J. Earth Planet. Sci., Nagoya Univ. 48.

邓克利，DJ。

Kusiak, M., Suzuki, K., Paszkowski, M.: "Preliminary report of CHIME dating on detritial monazite grains from the Namurian Poruba bed and the Stephanian Kwaczaka arkose in the Upper Silesian Coal Basin, Poland"J. Earth Planet. Sci., Nagoya Univ.. 48(In pr

Kusiak, M.、Suzuki, K.、Paszkowski, M.：“对来自波兰上西里西亚煤盆地那穆里安波鲁巴床和斯蒂芬尼夸扎卡长石的碎屑独居石颗粒进行 CHIME 测年的初步报告”J.

Kusiak, M., Suzuki, K., Paszkowski, M.: "Preliminary report of CHIME dating on detritial monazite grains from the Namurian Poruba bed and the Stephanian Kwaczaka arkose in the Upper Silesian Coal Basin, Poland"J.Earth Planet.Sci., Nagoya Univ.. 48(in pres

Kusiak, M.、Suzuki, K.、Paszkowski, M.：“对来自波兰上西里西亚煤盆地那穆里安 Poruba 床和 Stephanian Kwaczaka 长石的碎屑独居石颗粒进行 CHIME 测年的初步报告”J.Earth Planet.Sci

Asami, M, Suzuki, K. and Grew, E-S.: "Chemical Th-Utotal Pb dating by electron microprobe analysis of monazite, xenotime and zircon from the Archean Napier Complex, East Antarctica : evidence for ultra-high-temperature metamorphism at 2400 Ma."Precambrian

Asami, M, Suzuki, K. 和 Grew, E-S.：“通过电子探针分析对东南极太古宙纳皮尔杂岩中的独居石、磷钇矿和锆石进行化学 Th-Utotal Pb 测年：2400 年超高温变质作用的证据

田中姿郎,鈴木和博,足立守: "美濃帯北東部,月夜沢峠地域のジュラ紀礫岩から産出した約178MaのCHIME年代を示す花崗岩質岩礫についての予察的報告"名古屋大学博物館報告書. 16(印刷中). (2001)

Sugaro Tanaka、Kazuhiro Suzuki、Mamoru Adachi：“美浓带东北部月代泽山口地区侏罗纪砾岩中产生的 CHIME 年龄约为 178 Ma 的花岗岩砾石的初步报告”（2001 年）。 ）