It is an accepted fact that the main solid phase support for potassium in the Sichuan Basin is polyhalite [K2MgCa2(SO4)4·2H2O] rather than sylvineis (KCl) (Gong DX et al.,2015).The mineral types,occurrence charac...It is an accepted fact that the main solid phase support for potassium in the Sichuan Basin is polyhalite [K2MgCa2(SO4)4·2H2O] rather than sylvineis (KCl) (Gong DX et al.,2015).The mineral types,occurrence characteristics and metasomatism of the polyhalite bearing ore-bed were identified and the origin of the polyhalite was discussed.The polyhalite samples were obtained from the core of Z12,located in Dalong Village,Guang'an City of central Sichuan.The sampling depths were 2974 m (s-1),3023 m (s-2) and 3106 m (s-3).The microbeam analysis of back-scattering images was carried out using a Shimadzu EPMA-1720 Series electron probe micro-analyzer,supplemented by a quantitative spectrum analysis that determined the mineral types.展开更多
Introduction: Spinal cord infarction (SCI) is a relatively rare disease. Abnormality on magnetic resonance imaging (MRI) is an important diagnostic criterion. It may be normal on the first day. Then abnormal signal wi...Introduction: Spinal cord infarction (SCI) is a relatively rare disease. Abnormality on magnetic resonance imaging (MRI) is an important diagnostic criterion. It may be normal on the first day. Then abnormal signal will appear a few days later. There were some reports with negative MRI findings at the beginning. However, those reports were neither found abnormalities on repeat MRI nor without repeat MRI. Case Presentation: We report a case of SCI presented as paralysis of lower limbs and chest pain with no abnormalities on MRI through the course of disease in a 74-year-old female. Anti-platelet aggregation drugs, stabilizing plaque treatments and rehabilitation exercise were performed. The patient recovered significantly. She could walk independently a month after the onset. Conclusions: Although MRI provides important evidence for diagnosis, clinical manifestations are the most important when diagnosing. For patients who were highly suspected of SCI clinically, treatment for vascular diseases should be applied as soon as possible even if no lesion is found on imaging examination.展开更多
Rheology of rocks controls the deformation of the Earth at various space-time scales,which is crucial to understand the tectonic evolution of continental lithosphere.Researches of rock rheology are mainly conducted vi...Rheology of rocks controls the deformation of the Earth at various space-time scales,which is crucial to understand the tectonic evolution of continental lithosphere.Researches of rock rheology are mainly conducted via high-pressure and hightemperature rheological experiments and multi-scale observations and measurements of naturally deformed rocks.At present,a large amount of data from such kinds of studies have been accumulated.This paper first provides an up-to-date comprehensive review of the rheological mechanisms,fabric types and seismic properties of the main rock-forming minerals at different depths of continental lithosphere,including olivine,orthopyroxene,clinopyroxene,amphibole,plagioclase,quartz and mica.Then,progress in high-pressure and high-temperature experiments and natural deformation observations is introduced,mainly regarding the rheological strength and behavior,seismic velocity and anisotropy of lithospheric mantle peridotite,eclogite,mafic granulite,amphibolite and felsic rocks.Finally,by taking the Tibetan Plateau as an example,the application of rock rheology for quantitative interpretation of seismic anisotropy data is discussed.The combination of mineral deformation fabrics and seismic anisotropy is expected to make an important breakthrough in understanding the rheological properties and structure of continental lithosphere.展开更多
文摘It is an accepted fact that the main solid phase support for potassium in the Sichuan Basin is polyhalite [K2MgCa2(SO4)4·2H2O] rather than sylvineis (KCl) (Gong DX et al.,2015).The mineral types,occurrence characteristics and metasomatism of the polyhalite bearing ore-bed were identified and the origin of the polyhalite was discussed.The polyhalite samples were obtained from the core of Z12,located in Dalong Village,Guang'an City of central Sichuan.The sampling depths were 2974 m (s-1),3023 m (s-2) and 3106 m (s-3).The microbeam analysis of back-scattering images was carried out using a Shimadzu EPMA-1720 Series electron probe micro-analyzer,supplemented by a quantitative spectrum analysis that determined the mineral types.
文摘Introduction: Spinal cord infarction (SCI) is a relatively rare disease. Abnormality on magnetic resonance imaging (MRI) is an important diagnostic criterion. It may be normal on the first day. Then abnormal signal will appear a few days later. There were some reports with negative MRI findings at the beginning. However, those reports were neither found abnormalities on repeat MRI nor without repeat MRI. Case Presentation: We report a case of SCI presented as paralysis of lower limbs and chest pain with no abnormalities on MRI through the course of disease in a 74-year-old female. Anti-platelet aggregation drugs, stabilizing plaque treatments and rehabilitation exercise were performed. The patient recovered significantly. She could walk independently a month after the onset. Conclusions: Although MRI provides important evidence for diagnosis, clinical manifestations are the most important when diagnosing. For patients who were highly suspected of SCI clinically, treatment for vascular diseases should be applied as soon as possible even if no lesion is found on imaging examination.
基金This work was supported by the National Natural Science Foundation of China(Grant Nos.42022016,41930217 and 42372257)the Youth Innovation Team of Shaanxi Universities.
文摘Rheology of rocks controls the deformation of the Earth at various space-time scales,which is crucial to understand the tectonic evolution of continental lithosphere.Researches of rock rheology are mainly conducted via high-pressure and hightemperature rheological experiments and multi-scale observations and measurements of naturally deformed rocks.At present,a large amount of data from such kinds of studies have been accumulated.This paper first provides an up-to-date comprehensive review of the rheological mechanisms,fabric types and seismic properties of the main rock-forming minerals at different depths of continental lithosphere,including olivine,orthopyroxene,clinopyroxene,amphibole,plagioclase,quartz and mica.Then,progress in high-pressure and high-temperature experiments and natural deformation observations is introduced,mainly regarding the rheological strength and behavior,seismic velocity and anisotropy of lithospheric mantle peridotite,eclogite,mafic granulite,amphibolite and felsic rocks.Finally,by taking the Tibetan Plateau as an example,the application of rock rheology for quantitative interpretation of seismic anisotropy data is discussed.The combination of mineral deformation fabrics and seismic anisotropy is expected to make an important breakthrough in understanding the rheological properties and structure of continental lithosphere.
