Petrogenesis of granitic magma and its thermal history : disclosure of melting reaction from granitic suites

花岗质岩浆的岩石成因及其热历史：花岗质岩层熔融反应的揭示

• 批准号: 15540437
• 负责人: OWADA Masaaki
• 金额: $ 1.98万
• 依托单位: Yamaguchi University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15540437/
• 关键词: Granite; Metamorphic rocks; Partial melting; Radiometric age; Cooling history; Thermal history; Ndモデル年代; 原生代地殻; 上昇測度

An acceptable model for the generation of granitic magma is partial melting of crustal materials. Experimental studies using both model and natural systems have revealed melting reactions for crustal materials under conditions of lower to middle crust. The melting reactions in metamorphic rocks were previously reported from high-grade metamorphic terranes, whereas those in igneous rocks are less understood. It is possible that any information with respect to melting reactions is preserved in granitic suites because of their high-viscosity of magma.We found reaction texture to produce granitic melt in the granite suites that intruded granulite facies metamorphic rocks in the Kontum Massif, Vietnam and also metamorphic xenoliths included in the diorite complex in the Hidaka metamorphic belt, Japan. Taking texture and chemistry into account, the biotite included in the anhedral garnet would be of a residual phase at melting of the pelitic gneiss by dehydration melting. The reaction texture producing granitic melt would therefore be preserved in the pelitic gneiss as well as the granite in Kontum Massif, Vietnam. In the Hidaka metamorphic belt, whole-rock geochemical studies combined with metamorphic analyses indicate that the xenoliths in the diorite complex are regarded as restites after releasing granitic melt.Sm-Nd internal isochron ages involving retrograde garnet determined from three ultrahigh-temperature (UHT) gneisses taken from Tonagh Island, the western part of the Napier Complex, East Antarctica gave 1870 ± 82 Ma, 1897 ± 50 Ma and 1557 ± 35 Ma. It is stressed that the assembly of East Gondwana including the Napier Complex, the Rayner Complex, and the Eastern Ghats Belt, if existed, should be before ca 1600 Ma, and may be traced back to ca 2000 Ma of the supercontinent "Columbia" era.

花岗岩岩浆生成的可接受模型是地壳物质的部分熔融。使用模型和自然系统的实验研究揭示了下地壳到中地壳条件下地壳物质的熔融反应。以前曾报道过高级变质岩中的熔化反应，而火成岩中的熔化反应却知之甚少。由于岩浆粘度高，任何有关熔融反应的信息都可能保存在花岗岩套中。我们在越南昆嵩地块侵入麻粒岩相变质岩的花岗岩套中发现了产生花岗岩熔体的反应结构，并且在日本日高变质带的闪长岩杂岩中也发现了变质捕虏体。考虑到结构和化学性质，上角石榴石中包含的黑云母在泥质片麻岩通过脱水熔化而熔化时将是残余相。因此，产生花岗岩熔体的反应结构将保留在越南昆嵩地块的泥质片麻岩和花岗岩中。在日高变质带中，全岩地球化学研究结合变质分析表明，闪长岩杂岩中的捕虏体被视为释放花岗岩熔体后的休憩岩。从取自东纳皮尔杂岩体西部托纳岛的三块超高温（UHT）片麻岩中确定了涉及逆行石榴石的Sm-Nd内部等时线年龄 南极洲给出了 1870 ± 82 Ma、1897 ± 50 Ma 和 1557 ± 35 Ma。强调指出，包括纳皮尔杂岩、雷纳杂岩和东高止带在内的东冈瓦纳大陆的组装如果存在的话，应出现在约1600Ma之前，并可能追溯到约2000Ma超大陆“哥伦比亚”时代。

项目成果

Pan-African alkali granitoids from Sor Rondane Mountains, East Antarctica.

产自南极洲东部索龙达山脉的泛非碱性花岗岩。

• 发表时间: 2003
• 期刊: Gondwana Res. v.6
• 作者: Li;Z.;Tainosho;Y;Kimura;J.;Shiraishi;K.;Owada;M.;others
• 通讯作者: others

Resetting and closing condition of Rb-Sr whole-rock isochron system: some samples of metamorphic and granitic rocks from Gondwana super-continent and Japan Arc.

铷锶全岩等时线系统的复位和闭合条件:冈瓦纳超大陆和日本岛弧变质岩和花岗岩的部分样品.

• 发表时间: 2003
• 期刊: Polar Geoscience 16
• 作者: Kagami;H.;Shimura;T.;Yuhara;M.;Owada;M.;Osanai;Y.;Shiraishi;K.
• 通讯作者: K.

Permo-Triassic ultrahigh-temperature metamorphism in Kontum Massif, central Vietnam

越南中部昆嵩地块二叠纪-三叠纪超高温变质作用

• 发表时间: 2004
• 期刊: Journal of Mineral.Petrol.Science v.99
• 作者: Osanai;Y.;Nakano;N.;Owada;M.;others
• 通讯作者: others

Permo-Triassic ultrahigh-temperature metamorphism in the Kontum massif, central Vietnam

• DOI: 10.2465/jmps.99.225
• 发表时间: 2004-08
• 期刊: Journal of Mineralogical and Petrological Sciences
• 影响因子: 0.7
• 作者: Y. Osanai;N. Nakano;M. Owada;T. N. Nam;T. Toyoshima;T. Tsunogae;Pham Binh

Geology of eastern Muhlig-Hofmannfjella and Filchneifjella in Dronning Maud Land, East Antarctica : A preliminary report on a Japan-Norwey-Germany Joint Geological Investigation.

南极洲东部 Dronning Maud 地 Muhlig-Hofmannfjella 和 Filchneifjella 东部的地质：日本、挪威、德国联合地质调查的初步报告。

• 发表时间: 2003
• 期刊: Polar Geosci. No.16
• 作者: Owada;M.;Baba;S.;Laufer;A.;others
• 通讯作者: others