The thermodynamic calculation of dehydration reacton suggests very low activity of H\-2O during metamorphic peak of the Archaean granulite complex in the region studied.The a\-\{H\-2O\} values for Al\|rich gneiss and ...The thermodynamic calculation of dehydration reacton suggests very low activity of H\-2O during metamorphic peak of the Archaean granulite complex in the region studied.The a\-\{H\-2O\} values for Al\|rich gneiss and hypersthene biotite gneiss\|granulite in the Taipingzhai region are usually between 0.10 and \{0.20\},and those in the Louzishan region are \{0.15\}-\{0.25\}. The fugacity of O\-2 in terms of lgf\-\{O\-2\} in the whole region ranges from -8 to -14. The average coefficients of (μ\-\{H\-2O\}/X\+\{Bt\}\-\{Mg\}) and (μ\-\{O\-2\}/X\+\{Bt\}\-\{Mg\}) in the Taipingzhai region are \{-0.293\} and \{-1.60\} respectively,and those in the Louzishan region are \{-0.364\} and \{-1.420\}. The activity of H\-2O is very low in the whole region, but its values and other data mentioned above are considerably constant from place to place within a given region, even in rocks of different lithological characters. However, they show a certain gradient between different regions. Such characteristics are compatible with the genetic mechanism known as \!carbonic metamorphism" put forward by Newton et al.,i.e., the a\-\{H\-2O\} during the peak stage is controlled by permeation of pervasive CO\-2 influx of the mantle source,and shows features of external buffering.展开更多
The author proves the existence and movement of a deep-seated fraetural Zone located in the eenter zone of the diwa-type faulted basin in central Hebei Province. This deep-seated fraeturai zone tending in NNE directio...The author proves the existence and movement of a deep-seated fraetural Zone located in the eenter zone of the diwa-type faulted basin in central Hebei Province. This deep-seated fraeturai zone tending in NNE direction is a structural effect of the mtodle East Asin Grustobody in the Mexozoic-Cenozoic. This paper will diseuss the formation, evolution and the meehanism of the deep-seated fraetural zone, faulted basin and the buried hills as well as their relationships. The uthor expounds that the deep geological process is the major factor of the structural effect.展开更多
文摘The thermodynamic calculation of dehydration reacton suggests very low activity of H\-2O during metamorphic peak of the Archaean granulite complex in the region studied.The a\-\{H\-2O\} values for Al\|rich gneiss and hypersthene biotite gneiss\|granulite in the Taipingzhai region are usually between 0.10 and \{0.20\},and those in the Louzishan region are \{0.15\}-\{0.25\}. The fugacity of O\-2 in terms of lgf\-\{O\-2\} in the whole region ranges from -8 to -14. The average coefficients of (μ\-\{H\-2O\}/X\+\{Bt\}\-\{Mg\}) and (μ\-\{O\-2\}/X\+\{Bt\}\-\{Mg\}) in the Taipingzhai region are \{-0.293\} and \{-1.60\} respectively,and those in the Louzishan region are \{-0.364\} and \{-1.420\}. The activity of H\-2O is very low in the whole region, but its values and other data mentioned above are considerably constant from place to place within a given region, even in rocks of different lithological characters. However, they show a certain gradient between different regions. Such characteristics are compatible with the genetic mechanism known as \!carbonic metamorphism" put forward by Newton et al.,i.e., the a\-\{H\-2O\} during the peak stage is controlled by permeation of pervasive CO\-2 influx of the mantle source,and shows features of external buffering.
文摘The author proves the existence and movement of a deep-seated fraetural Zone located in the eenter zone of the diwa-type faulted basin in central Hebei Province. This deep-seated fraeturai zone tending in NNE direction is a structural effect of the mtodle East Asin Grustobody in the Mexozoic-Cenozoic. This paper will diseuss the formation, evolution and the meehanism of the deep-seated fraetural zone, faulted basin and the buried hills as well as their relationships. The uthor expounds that the deep geological process is the major factor of the structural effect.
