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山西恒山变质岩中斜长角闪岩经历了复杂的变质变形过程,为角闪石塑性变形提供了深入研究的契机.本文通过对变形角闪石样品的显微构造观察、电子探针分析和变形条件估算确定恒山地区斜长角闪岩的变质变形过程可分为二个阶段:(1)变质反应(～775℃,0.585GPa),原岩辉长岩中辉石退变为角闪石,形成近等粒状角闪石冠状体;(2)局部韧性剪切变形过程(650～679℃,0.770～0.914GPa),近等粒状新生角闪石和亚颗粒旋转斜长石发生递进变形,形成角闪石集合体残斑结构和强定向排列等变形组构,应变量>1000%.进一步的EBSD组构和TEM亚微构造分析,发现递进变形过程中等粒状角闪石和斜长石颗粒内部位错等亚微构造发育微弱,在组构极密投影图上仅在强变形部位出现{100}<001>滑移系的优选,新生等粒状角闪石集合体由残斑结构变形为强定向排列组构的过程中发生了超塑性流动,其变形机制以颗粒边界滑移为主.
The plagioclase amphibolite in Hengshan metamorphism experienced a complex process of metamorphism and deformation, which provided an opportunity for further study on plastic deformation of amphibole.In this paper, microstructural observation, electron probe analysis Estimation of Deformation Conditions Determining the metamorphic deformation of the amphibolite in Hengshan can be divided into two stages: (1) metamorphic reaction (~ 775 ℃, 0.585GPa), degenerated pyroxene in the original rock gabbro into hornblende (2) the local ductile shear deformation process (650 ~ 679 ℃, 0.770 ~ 0.914GPa), the near-gravel nascent amphibole and subgrain rotating plagioclase occur progressive deformation, The formation of amphibole assemblages such as the structure of the residual spots and the strong directional arrangement of deformed structures, strain> 1000% .Further EBSD fabric and TEM submicro-structure analysis found that progressive deformation of equal granular amphibole and plagioclase particles The sub-micro structures such as internal dislocations are weakly developed, and the {100} <001> slip system appears only in strongly deformed areas on the very dense projection of the structure. The superplastic flow occurred in the strongly aligned structure, which changed Shape-based mechanism to particle boundary slip based.