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Formation Depth of Coesite-Bearing Eclogite,dabie uhpm zone,China

Journal of China University of Geosciences 2004年第2期15卷 206-215页

作者： LuGuxian LiuRuixun WangFangzheng ChenJing InstituteofGeomechanics ChineseAcademyofGeologicalSciencesBeijing100081China SchoolofEarthandSpaceSciences PekingUniversityBeijing100871China FacultyofEarthSciences ChinaUniversityofGeosciencesWuhan430074China ElectronMicroscopyLaboratory PekingUniversityBeijing100871China

The plastic deformation of garnet in coesite bearing eclogite, quartz eclogite and garnet amphibolite of the uhpm complex in Yingshan County in the dabie Mountains has been studied. The stress generated by the strong tectonic movement was an important component of the total pressure that resulted in the formation of the eclogite in the dabie uhpm zone. The three dimensional tectonic principal stresses and additional tectonic stress induced hydrostatic pressure [ p s=( σ 1+ σ 2+ σ 3)/3] are reconstructed according to the differential stress and the strain ratio ( α ) of the garnet in the minor coesite bearing eclogite of the Yingshan County. Then the gravity induced hydrostatic pressure ( p g) is calculated following the equation p minus p s, where p is estimated to be 2.8 GPa based on the quartz coesite geobarmeter. Therefore, the thickness of the rock column overlying the coesite bearing eclogite in the Ying shan County is determined ≥32 km. This estimation, significantly different from ≥100 km, the previous one obtained solely based on the weight/specific weight ratio (W/SW), offers a proper explanation for the puzzle that no tracer of the addition of mantle derived material has been found in the dabie uhpm zone during the process of uhpm, although a number of researchers claim that this process took place at the depth of the mantle (≥100 km). It is concluded that attention should be paid to the additional tectonic stress induced hydrostatic pressure in the study of uhpm zones.

关键词： dabie uhpm zone formation depths additional tectonic stress-induced hydrostatic pressure coesite-bearing eclogite tectonic physicochemistry plastic deformation garnet

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Depth of coesite-bearing eclogite formation, dabie uhpm zone, China, based on structure stress correction

Depth of coesite-bearing eclogite formation, Dabie UHPM zone...

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地壳深部压力状态与地质作用学术研讨会

作者： Lü Guxian, Chen Jing, Ding Tiping, Li Xiaobo, Wang Fangzheng and Liu Ruixun Institute of Geomechanics, Beijing, 100081, China Electron Microscopy Laboratory, Peking University, Beijing, 100871, China Open Research Laboratory of Isotope Geology, Chinese Academy of Geological Sciences, Beijing 100037, China Institute of Geological Information, Beijing, 100037, China China University of Geosciences, Wuhan, Hubei, 430074, China Department of Geology, Peking University, Beijing, 100871, China

＜正＞ Plastic deformation of garnet in coesite-bearing eclogite, quartz eclogite and garnet amphibolite of the ultra-high pressure metamorphic（uhpm） complex in Yingshan County, dabie Mountains, has been studied by transmission electron microscopy （TEM）. Garnets have undergone ductile deformation under eclogite and amphibolite facies conditions. Garnet microstructures vary greatly with the dislocation density of the garnet being lower in coesite-bearing eclogite is than that in garnel *** generated by strong tectonic movement were an important component of the total pressure causing the formation of eclogite in the dabie uhpm zone. The three-dimensional tectonic principal stresses and additional tectonic stress-induced hydrostatic pressure [Ps=-（σ1+σ2+σ3）/3] are reconstructed according to the differential stress and strain ratio （a） of garnet in minor coesite-bearing eclogite of Yingshan county. Then the gravity-induced hydrostatic pressure （PG） is calculated through P minus PS, where P is estimated to be 2.8 GPa based on the quartz-coesite geobarmeter. Therefore, the thickness of the rock column overlying the coesite-bearing eclogite in Yingshan county is determined to be ≥2.09-32.11 km. this estimation is significantly different from the previous estimation of ≥100km obtained solely by considering the weight/specific weight ratio （W/SW）.It gives also a proper explanation to the puzzle that no tracer of addition of mantle-derived material has been found in the dabie uhpm zone during the process of uhpm, although a number of researches claim that this process was taking place at depth of the mantle （≥100 km） . It is concluded that attention should be paid to the additional tectonic stress-induced hydrostatic pressure in the study of uhpm zones.

关键词： dabie uhpm zone formation depth additional tectonic stress-induced hydrostatic pressure coesite-bearing eclogite tectonic physicochemistry plastic deformation garnet

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