Evaluation of effects of chemical reactions on ductile shear deformation
化学反应对延性剪切变形影响的评估
基本信息
- 批准号:07454120
- 负责人:
- 金额:$ 4.54万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (B)
- 财政年份:1995
- 资助国家:日本
- 起止时间:1995 至 1996
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
We evaluated the effects of chemical reactions on ductile deformation in granite, gabbro and peridotite mylonites formed within ductile shear zones in the middle crust, the lower crust and the uppermost mantle, respectively. The results are summarized below.1) Deformation-induced K-feldspar replacement by myrmekite occurs in the amphibolite-facies granite mylonites along the eastern margin of the Hatakawa shear zone. The fine-grained reaction products compose the main constituent in the mylonite matrix and largely accommodate the strain in the mylonites. Mylonites are preferentially developed in leucocratic domains or aplite veins which are rich in K-feldspar and poor in biotite, where the myrmekite-forming reaction was more favored to produce more amounts of fine-grained reaction products than non-leucocratic domains during deformation. Subsequent reaction weakening would have favored further deformation in leucocratic domains or aplite veins, which in turn would have favored further myrmekite-forming reaction. Such a feedback process is probably responsible for the development of granite mylonites in the Hatakawa shear zone.2) Strain localization into the fine-grained reaction products formed by decomposition of clinopyroxene into amphibole as well as dynamic recrystallization of plagioclase contributed to the development of granulite-facies gabbroic mylonites in the Hidaka metamorphic belt.3) The lehrzolite mylonite in the Uenzaru peridotite body in the Hidaka metamorphic belt developed by strain localization into the symplectite composed of plagioclase, olivine and chromian spinel when spinel lherzolite was transformed into plagioclase lherzolite during ascent of the peridotite body.
本文分别研究了中地壳、下地壳和上地幔韧性剪切带中形成的花岗岩、辉长岩和橄榄岩糜棱岩中化学反应对韧性变形的影响。结果总结如下:1)变形引起的钾长石被myrmekite替换发生在角闪岩相花岗岩糜棱岩沿着东缘的Hatakawa剪切带。细粒反应产物是糜棱岩基质的主要成分,在很大程度上调节了糜棱岩的应变。糜棱岩优先发育在富钾长石、贫黑云母的浅色域或细晶脉中,在变形过程中,这些区域比非浅色域更有利于糜棱岩的形成反应,生成更多的细粒反应产物。随后的反应减弱将有利于浅色域或细晶脉的进一步变形,这反过来又有利于进一步的myrmekite形成反应。2)应变局部化到单斜辉石分解成角闪石的细粒反应产物中,以及斜长石的动态重结晶作用,促进了日高变质带麻粒岩相辉长糜棱岩的发育。日高变质带中的Uenzaru橄榄岩体中的二辉橄榄岩糜棱岩,是在橄榄岩体上升过程中,由尖晶石二辉橄榄岩向斜长石二辉橄榄岩转化时,应变局部化而形成的由斜长石、橄榄石和铬尖晶石组成的合晶岩。
项目成果
期刊论文数量(72)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Tanio Ito,Takeshi Ikawa,Satoshi Yamakita and Takuya Maeda: "Gently north-dipping Median Tedtonic Line (MTL) revealed by recent seismic reflection studeis,southwest Japan" Tectonophysics. 264・1-4. 346-360 (1996)
Tanio Ito、Takeshi Ikawa、Satoshi Yamakita 和 Takuya Maeda:“日本西南部最近的地震反射研究揭示了轻微北倾的中位构造线(MTL)”264・1-360(1996)。
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Grew,E.S.,Hiroi,Y.,Motoyoshi,Y.,Kondo,Y.,Jayatileke,J.M.S.and Marquez,N.: "Iron-rich kornerupine in sheared pegmatite from the Wanni Complex at Homagama,Sri Lanka" European Journal of Mineralogy. 7. 623-636 (1995)
Grew,E.S.、Hiroi,Y.、Motoyoshi,Y.、Kondo,Y.、Jayatileke,J.M.S. 和 Marquez,N.:“斯里兰卡 Homagama 万尼杂岩中剪切伟晶岩中富含铁的角晶石”《欧洲矿物学杂志》
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廣井美邦・小林栄一: "阿武隈変成帯,日立西方地域における十字石の新産地" 岩石鉱物鉱床学会誌. 90. 247-256 (1995)
Mikuni Hiroi 和 Eiichi Kobayashi:“日立地区西部阿武隈变质带十字石的新位置”日本岩石矿床学会杂志 90. 247-256 (1995)。
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Takahashi,N.: "Incipient melting of mantle peridotites observed in the Horoman and Nikanbetsu peridotite complexes,Hokkaido,northern Japan" 岩石鉱物鉱床学会誌. 92. 1-24 (1997)
Takahashi, N.:“在日本北部北海道的 Horoman 和 Nikanbetsu 橄榄岩杂岩中观察到的地幔橄榄岩的早期熔化”,日本岩石和矿物沉积学会杂志 92. 1-24 (1997)。
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Kanagawa, K.: "Numerical simulation of pressure fringe growth by the displacementcontrolled rigid fiber growth and its application to analysis of non-coaxiality and progressive deformation." Journal of the Geological Society of Japan. Vol.102. 180-189 (19
Kanakawa, K.:“通过位移控制的刚性纤维生长对压力条纹生长进行数值模拟及其在非同轴性和渐进变形分析中的应用。”
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KANAGAWA Kyuichi其他文献
KANAGAWA Kyuichi的其他文献
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{{ truncateString('KANAGAWA Kyuichi', 18)}}的其他基金
Materials-science aspects on the velocity and temperature dependence of fault strength at high slip velocities
高滑移速度下断层强度与速度和温度依赖性的材料科学方面
- 批准号:
23340151 - 财政年份:2011
- 资助金额:
$ 4.54万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Reconstruction of the continental lower-crust rheology based on the rheology data of plagioclase
基于斜长石流变数据的大陆下地壳流变学重建
- 批准号:
17340159 - 财政年份:2005
- 资助金额:
$ 4.54万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Verification of superplastic flow in the crust and mantle
地壳和地幔超塑性流动的验证
- 批准号:
13304042 - 财政年份:2001
- 资助金额:
$ 4.54万 - 项目类别:
Grant-in-Aid for Scientific Research (A)