Phengites in ecologites of the Dabieshan region can be divided into three generations: primary phengite formed during ecologite-facies prograde metamorphism (Phe1), phengite formed during the late stage of eclogite-fa...Phengites in ecologites of the Dabieshan region can be divided into three generations: primary phengite formed during ecologite-facies prograde metamorphism (Phe1), phengite formed during the late stage of eclogite-facies retrograde metamorphism (Phe2) and phengite formed during amphibolite- to greenschist-facies diaphthoresis (Phe3). Electron microprobe analyses show that the Si and Fe\+\{2+\}+Mg contents of Phe1 are unexpectedly lower than those of Phe3. Therefore, much caution should be exercised while using the Si content of phengite to estimate the pressure of a retrograde process.展开更多
Wavelet decomposition is used to analyze barometric fluctuation and earth tidal response in borehole water level changes. We apply wavelet analysis method to the decomposition of barometric fluctuation and earth tidal...Wavelet decomposition is used to analyze barometric fluctuation and earth tidal response in borehole water level changes. We apply wavelet analysis method to the decomposition of barometric fluctuation and earth tidal response into several temporal series in different frequency ranges. Barometric and tidal coefficients in different frequency ranges are computed with least squares method to remove barometric and tidal response. Comparing this method with general linear regression analysis method, we find wavelet analysis method can efficiently remove barometric and earth tidal response in borehole water level. Wavelet analysis method is based on wave theory and vibration theories. It not only considers the frequency characteristic of the observed data but also the temporal characteristic, and it can get barometric and tidal coefficients in different frequency ranges. This method has definite physical meaning.展开更多
文摘Phengites in ecologites of the Dabieshan region can be divided into three generations: primary phengite formed during ecologite-facies prograde metamorphism (Phe1), phengite formed during the late stage of eclogite-facies retrograde metamorphism (Phe2) and phengite formed during amphibolite- to greenschist-facies diaphthoresis (Phe3). Electron microprobe analyses show that the Si and Fe\+\{2+\}+Mg contents of Phe1 are unexpectedly lower than those of Phe3. Therefore, much caution should be exercised while using the Si content of phengite to estimate the pressure of a retrograde process.
基金The research was jointly supported by National NatureScience Foundation of China (40374019)the research subject entitled"Research on the Digital Data Analysis and Application of Underground Fluid" under the 11th Five-Year Program of China Earthquake Administration(2006BAC01B02-03-02)
文摘Wavelet decomposition is used to analyze barometric fluctuation and earth tidal response in borehole water level changes. We apply wavelet analysis method to the decomposition of barometric fluctuation and earth tidal response into several temporal series in different frequency ranges. Barometric and tidal coefficients in different frequency ranges are computed with least squares method to remove barometric and tidal response. Comparing this method with general linear regression analysis method, we find wavelet analysis method can efficiently remove barometric and earth tidal response in borehole water level. Wavelet analysis method is based on wave theory and vibration theories. It not only considers the frequency characteristic of the observed data but also the temporal characteristic, and it can get barometric and tidal coefficients in different frequency ranges. This method has definite physical meaning.
