Based on the study about the geological background of Beiya Gold Deposit, numerical simulation was conducted about the three-dimensional structural stress field for Beiya Gold Deposit by applying finite element theory...Based on the study about the geological background of Beiya Gold Deposit, numerical simulation was conducted about the three-dimensional structural stress field for Beiya Gold Deposit by applying finite element theory and by employing a linear elasticity model. Results of the simulation indicate that the Beiya syncline is a faulted basin, and a hidden fracture occurs in the west wing of the syncline.Under the action of the EW-trending compressive force, four nearly NS-trending fractures (groups) were generated in the stress stretching areas of the two wings of the syncline, and these fractures constitute favorable tectonic positions for the upward intrusion of porphyry magma and the occurrence of Au-Pb-Zn polymetallic deposits.展开更多
This study was carried out to assess the biological status of two crane species, the Common Crane (Grus grus L.) and the Demoiselle Crane (Anthropoides virgo L.), with respect to the hunting pressure in two southern d...This study was carried out to assess the biological status of two crane species, the Common Crane (Grus grus L.) and the Demoiselle Crane (Anthropoides virgo L.), with respect to the hunting pressure in two southern districts of northern Pakistan, Bannu and Lakki. Field surveys, interviews and questionnaires were the major tools for data collection. We visited 165 hunting camps in the fall of 2008 and 85 in the spring of 2009 in the two districts. Of the hunters, most possessed wildlife permits for hunting and most people hunted for recreation. According to our survey, the population of two crane species is declining due to overhunting, destruction of natural habitats, anthropogenic activities and geographical factors. Suggestions for protection of the cranes are proposed.展开更多
文摘Based on the study about the geological background of Beiya Gold Deposit, numerical simulation was conducted about the three-dimensional structural stress field for Beiya Gold Deposit by applying finite element theory and by employing a linear elasticity model. Results of the simulation indicate that the Beiya syncline is a faulted basin, and a hidden fracture occurs in the west wing of the syncline.Under the action of the EW-trending compressive force, four nearly NS-trending fractures (groups) were generated in the stress stretching areas of the two wings of the syncline, and these fractures constitute favorable tectonic positions for the upward intrusion of porphyry magma and the occurrence of Au-Pb-Zn polymetallic deposits.
文摘This study was carried out to assess the biological status of two crane species, the Common Crane (Grus grus L.) and the Demoiselle Crane (Anthropoides virgo L.), with respect to the hunting pressure in two southern districts of northern Pakistan, Bannu and Lakki. Field surveys, interviews and questionnaires were the major tools for data collection. We visited 165 hunting camps in the fall of 2008 and 85 in the spring of 2009 in the two districts. Of the hunters, most possessed wildlife permits for hunting and most people hunted for recreation. According to our survey, the population of two crane species is declining due to overhunting, destruction of natural habitats, anthropogenic activities and geographical factors. Suggestions for protection of the cranes are proposed.
