Modeling for the development of the crust

地壳发育建模

• 批准号: 06302031
• 负责人: HIRAJIMA Takao
• 金额: $ 3.26万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06302031/
• 关键词: Memamorphism; Modeling; P-T path; Rock texture; Migmatite; Ultrahigh-pressure rock; p-t経路

This research was organized to construct a quantitative nemerical model for repressenting the rock forming mechanism and kinematic process in the lower crust using the high quality natural data on petrology, mineralogy, geochemistry and continuum dynamics. The study group is composed of a "data collection" group and "modeling" group.1) In Sanbagawa belt, the difference of subduction path between neighboring regions is deciphered. It became clear that the direction of the uplift of the belt is parallel to the trend of the subduction direction.2) In Abukuma and Ryoke belts, partial melting took place in a wider area of the higher grade parts than hitherto recognized. New dating techniques such as SHRIMP and CHIME make clear the protolith and metamophic timings of these belts. Many sector zoned garnets were found from the higher grade parts of these belts. The growth of such garnet and the abrupt texture change from schistose to gneissose in the higher grade parts were ascribed to the par … More tial melting of crustal material in the higher grade part. An hypothesis on the thermal source of the Ryoke belt ascribed to the subduction of the oceanic ridge was denied by this study.3) In the Su-Lu region, the transition of igneous rocks to ultrahigh pressure (UHP) rocks, and the overprinting of medium pressure (MP) assemblage on the UHP rocks are clarified, which demonstrated that some MP orthogneiss of the Su-Lu region were once located in the depth of 100km depth and that the decomposition process of UHP rocks are fairly rapid without significant cooling.4) 2-dimensional X-ray mappings reveal that the irreversible crystallization in over-saturated system, realized by overstepping of univarinat line, is common even in the higher grade metamorphic rocks, and that the element exchange took place even in the core of the garnet in the lower grade rock. These fact suggest that the careful treatment is need to determine the P-T-t path of metamorphic rock by inversion analyzes.5) These data give quantitative constraints on the modeling. The guide line for producing the quantitative numerical model for explaining various physical phenomenons in the lower crust is proposed. Less

这项研究的组织是为了构建一个定量模型，用于使用有关质学的高质量自然数据，矿物学，矿物学的研究组，由“ Tion”组和“建模”组组成的研究组。 Sanbagawa带，邻近区域之间的俯冲路径的差异是解密的。新的约会技术，虾和我清除了这些皮带的原始时间和变质的时间。 Su-lu地区拒绝了较高的级别的地壳材料。澄清的UHP岩石上的中等燃料（MP）组合，证明了Su-Lu区域的MP Orthogneiss曾经位于100km的深度和UHP岩石的DETOM位置过程中，相当迅速地降温。4）2）2 -Dimener X射线映射显示，不可逆的系统的臭岩石，元素交换了在石榴石核心中，在低级岩石的核心中表明了这些事实。反转分析。5）模型上的数值模型

项目成果

Obata, M.: "Ultramafic pseudotachylite from the Balmuccia peridotite, Ivrea-Verbano Zone, northern Italy." Tectonophysics. 242. 313-328 (1995)

Obata, M.：“来自意大利北部伊夫雷亚-韦尔巴诺带 Balmuccia 橄榄岩的超铁质假速石。”

Wallis, S. R.,: "Occurrence and field relationships of ultrahigh-pressure metagranitoid and coesite eclogite in the Su-Lu terrane, eastern China." Jour. Geol. Soc. London,. 153 (印刷中). (1997)

Wallis, S. R.，“中国东部苏鲁地体中超高压变花岗岩和柯石英榴辉岩的产状和现场关系”，《地质学杂志》，1997 年。

Hiramatsu,S.,平島・Cong.B.: "Ultrahigh pressure garnet lherzolite from Chijiadian,Rongcheng County,in the Su-Lu region in eastern China" The Island Arc. 4(印刷中). (1995)

Hiramatsu, S., Hirashima, Cong.：“中国东部荣成县赤家店的超高压石榴石二辉橄榄岩”，岛弧 4（出版中）。

Hirajima, T.,: "Effect of jadeite-content on the garnet-clinopyroxene geothermometer for an ultrahigh-pressure eclogite complex." Proc. Japan Academy,. 72. 208-213. (1996)

Hirajima, T.：“硬玉含量对超高压榴辉岩杂岩石榴石-单斜辉石地温计的影响。”

Wallis,S.R.: "Occurrence and field relationships of ultrahigh-pressure metagranitoid and coesite elogite in the Su-Lu terrane,eastern China." Jour.Geol.Soc.London. 153(印刷中). (1997)

Wallis, S.R.：“中国东部苏鲁地体超高压变花岗岩和柯石英辉辉岩的产状和现场关系”，Jour.Geol.Soc.London 153（出版中）。