Ductile deformation and its geological implications for retrograded   eclogites from the Hongqiyingzi Complex in Chicheng, northern Hebei,   China

doi:10.1007/s11430-016-5316-6

CORC > 北京大学 > 地球与空间科学学院

	Ductile deformation and its geological implications for retrograded eclogites from the Hongqiyingzi Complex in Chicheng, northern Hebei, China
	Liu ShiRan ; Zhang JinJiang ; Qi GuoWei ; Wang Meng
刊名	SCIENCE CHINA-EARTH SCIENCES
	2016
关键词	Fabric Microstructure Retrograded eclogites Electron backscatter diffraction (EBSD) Hongqiyingzi Complex North China ELECTRON BACKSCATTER DIFFRACTION CRYSTAL PREFERRED ORIENTATIONS CONTINENTAL DEEP SUBDUCTION UHP METAMORPHIC TERRANE SEISMIC PROPERTIES DYNAMIC RECRYSTALLIZATION EXHUMATION DYNAMICS MAIN HOLE SW JAPAN CRATON
DOI	10.1007/s11430-016-5316-6
英文摘要	The rheology of rocks at depth remains a key point in earth sciences. Deformation of high-temperature-high-pressure rocks from the subduction zone has not been fully studied; in particular, the deformation behavior of eclogites remains poorly understood. This research is focused on the microstructure and fabric of retrograded eclogites from the Hongqiyingzi Complex in Chicheng, north Hebei, China, based on photomicrography, scanning electron microscopy (SEM) and electron backscattered diffraction (EBSD) analysis. The analytical results show that plastic deformation occurred in the garnets during exhumation, but they do not show an obvious lattice preferred orientation (LPO). This can be interpreted as being caused by the simultaneous activation of multiple slip systems in the garnets during deformation by dislocation creep. The plagioclases have a special fabric; the (001) LPO presents a maximum in Z direction which can be correlated with a new [100](001) slip system. The misorientation angle distribution (MAD) of the plagioclases in the deformed retrograded garnet augens shows a special bimodal distribution with peaks in both a low-angle range (<40 degrees) and a high-angle range (>140 degrees). In the retrograded garnet augens (i.e. "white eye socket" garnets) the maximum peak moves from a high-angle range to a low-angle range when we analyze only those plagioclases surrounding the residual garnet porphyroclast. Deformation behavior is controlled by the crystallographic orientation of the host grain and the grain boundary sliding process. Hornblendes in different layers and the retrograded garnet augens show almost the same strong LPO patterns, which are correlated with the [001](010) slip system; and MAD diagrams show a peak in a low-angle range (<40 degrees). Integrating recent studies on metamorphism and geochronology, we argue that ductile deformation occurred during the exhumation periods together with retrograded metamorphism.; National Natural Science Foundation of China [41430207]; National Basic Research Program of China [2013CB429804]; Special Fund for Basic Research of Central Universities [310827161010]; SCI(E); EI; 中国科学引文数据库(CSCD); ARTICLE; zhjj@pku.edu.cn; 8; 1610-1621; 59
语种	英语
内容类型	期刊论文
源URL	[http://ir.pku.edu.cn/handle/20.500.11897/491708]
专题	地球与空间科学学院
推荐引用方式 GB/T 7714	Liu ShiRan,Zhang JinJiang,Qi GuoWei,et al. Ductile deformation and its geological implications for retrograded eclogites from the Hongqiyingzi Complex in Chicheng, northern Hebei, China[J]. SCIENCE CHINA-EARTH SCIENCES,2016.
APA	Liu ShiRan,Zhang JinJiang,Qi GuoWei,&Wang Meng.(2016).Ductile deformation and its geological implications for retrograded eclogites from the Hongqiyingzi Complex in Chicheng, northern Hebei, China.SCIENCE CHINA-EARTH SCIENCES.
MLA	Liu ShiRan,et al."Ductile deformation and its geological implications for retrograded eclogites from the Hongqiyingzi Complex in Chicheng, northern Hebei, China".SCIENCE CHINA-EARTH SCIENCES (2016).