The Xinjie layered intrusion in the Panxi region,SW China,hosts both Fe-Ti oxide and platinum-group element（PGE） sulfide mineralization.The intrusion can be divided,from the base upward,into UnitsⅠ,ⅡandⅢ,in terms...The Xinjie layered intrusion in the Panxi region,SW China,hosts both Fe-Ti oxide and platinum-group element（PGE） sulfide mineralization.The intrusion can be divided,from the base upward,into UnitsⅠ,ⅡandⅢ,in terms of mineral assemblages.UnitsⅠandⅡare mainly composed of wehrlite and clino-pyroxenite, whereas UnitⅢis mainly composed of gabbro.PGE sulfide-rich layers mainly occur in Unit I, whereas thick Fe-Ti oxide-rich layers mainly occur in UnitⅢ.An ilmenite-rich layer occurs at the top of UnitⅠ.Fe-Ti oxides include magnetite and ilmenite.Small amounts of cumulus and intercumulus magnetite occur in UnitsⅠandⅡ.Cumulus magnetite grains are commonly euhedral and enclosed within olivine and clinopyroxene.They have high Cr2O3 contents ranging from 6.02 to 22.5 wt.%,indicating that they are likely an early crystallized phase from magmas.Intercumulus magnetite that usually displays ilmenite exsolution occupies the interstices between cumulus olivine crystals and coexists with interstitial clinopyroxene and plagioclase.Intercumulus magnetite has Cr2O3 ranging from 1.65 to 6.18 wt.%, lower than cumulus magnetite.The intercumulus magnetite may have crystallized from the trapped liquid.Large amounts of magnetite in UnitⅢcontains Cr2O3（＆lt;0.28 wt.%） much lower than magnetite in UnitsⅠandⅡ.The magnetite in UnitⅢis proposed to be accumulated from a Fe-Ti-rich melt.The Fe-Ti-rich melt is estimated to contain 35.9 wt.%of SiO2,26.9 wt.%of FeOt,8.2 wt.%of TiO2,13.2 wt.%of CaO, 8.3 wt.%of MgO,5.5 wt.%of Al2O3 and 1.0 wt.%of P2O5.The composition is comparable with the Fe-rich melts in the Skaergaard and Sept Iles intrusions.Paired non-reactive microstructures,granophyre pockets and ilmenite-rich intergrowths,are representative of Si-rich melt and Fe-Ti-rich melt,and are the direct evidence for the existence of an immiscible Fe-Ti-rich melt that formed from an evolved ferro-basaltic magma.展开更多
Improving rural living environment is an important support for farmers to live and work in peace and contentment,which is of great significance to the shaping of happy and livable homes in rural areas under the backgr...Improving rural living environment is an important support for farmers to live and work in peace and contentment,which is of great significance to the shaping of happy and livable homes in rural areas under the background of "beautiful countryside".Through the comprehensive renovation of the beautiful countryside,great progress has been made in improving the rural living environment in Beijing,but there are still problems in rural settlement landscape such as poor quality of landscape environment,low utilization rate of public space,and insufficient protection of traditional features.This study took the design strategy of rural settlement landscape as the research entry point,took the rural high-quality landscape environment demand and the beautiful rural construction goal as the double guidance,explored the design strategy of improving the quality of rural settlement landscape through the methods of field survey and questionnaire survey,and put forward the following design points:①From the perspective of overall consideration and advantage integration,the overall framework of rural settlement landscape should comprehensively consider rural architectural landscape and living environment landscape;②efforts should be made to create public spaces such as the village landscape image Avenue,landscape sharing garden,and open courtyard in front of the house,so as to improve the environmental quality and spatial vitality of the village;③strengthen the protection of the traditional features of the village,such as the famous ancient trees,the texture of the courtyard,the quality of residential buildings,etc.with a view to promoting the improvement and overall improvement of the rural environment.展开更多
The Hebei Xinji Barium Salt Group Co. Ltd is the largest barium salt production and export base in the world. Major products include Five Continents brand industrial barium carbonate, high purity barium carbonate, pre...The Hebei Xinji Barium Salt Group Co. Ltd is the largest barium salt production and export base in the world. Major products include Five Continents brand industrial barium carbonate, high purity barium carbonate, precipitated barium sulphate, barium nitrate, industrial sodium sulphide, industrial sulfur, sodium thiosulfate and sodium hydrosulphide. The annual output of barium salt is 120,000 tons, 2/3 for export. In 1995, the export value was US$20 million. As early as in 1953, its sodium sulphide began to be exported and re-展开更多
奥灰岩溶裂隙含水层是影响华北型煤矿深部开采的重要水害,在水-岩相互作用下奥灰含水层易导致煤层底板突水。为进一步认识奥灰岩溶突水问题,文章以新集矿区深部1煤层开采为例,利用矿区近些年最新积累的奥灰钻孔资料,选取断层强度指数、...奥灰岩溶裂隙含水层是影响华北型煤矿深部开采的重要水害,在水-岩相互作用下奥灰含水层易导致煤层底板突水。为进一步认识奥灰岩溶突水问题,文章以新集矿区深部1煤层开采为例,利用矿区近些年最新积累的奥灰钻孔资料,选取断层强度指数、断层交叉点与尖灭点、含水层水压、富水性、隔水层等效厚度、脆塑比7个因素作为奥灰岩溶突水的主控因素,并结合层次分析法(analytic hierarchy process,AHP)确定各主控因素影响权重。运用地理信息系统(geographic information system,GIS)空间分析功能建立各主控因素专题图,通过对专题栅格图归一化处理,将各主控因素按照权重进行空间复合叠加,最终获得1煤层底板奥灰岩溶突水危险性评价分区结果。将评价结果与突水系数法计算结果对比分析可知,基于GIS的煤层底板突水危险性评价方法更符合矿区实际地质情况,可以为矿区深部煤层开采与水害防治工作提供参考依据。展开更多
Xinji City, in the middle south of Hebei Province, has a tanning history of more than 400 years. The city boasted over 100 kinds of fur and leather products, over 300 workshops and shops and 24 foreign agencies in the...Xinji City, in the middle south of Hebei Province, has a tanning history of more than 400 years. The city boasted over 100 kinds of fur and leather products, over 300 workshops and shops and 24 foreign agencies in the early years of the Qing Dynasty (1644-1911). Since 1949, especially since 1981,the city’s tanning industry has witnessed a big leap. There are around 10, 000 tanning enterprises in the city with an annual industrial value of RMB 1.3 billion and an annual export value of US $展开更多
基金supported by a National Program on Key Basic Research Project(973 Program,Grant No.2011CB808903)National Natural Science Foundation of China(Grant Nos.41073030 and 41121002)a 'CAS Hundred Talents' project under Chinese Academy of Sciences to CYW and a GIGCAS 135 project Y234041001
文摘The Xinjie layered intrusion in the Panxi region,SW China,hosts both Fe-Ti oxide and platinum-group element（PGE） sulfide mineralization.The intrusion can be divided,from the base upward,into UnitsⅠ,ⅡandⅢ,in terms of mineral assemblages.UnitsⅠandⅡare mainly composed of wehrlite and clino-pyroxenite, whereas UnitⅢis mainly composed of gabbro.PGE sulfide-rich layers mainly occur in Unit I, whereas thick Fe-Ti oxide-rich layers mainly occur in UnitⅢ.An ilmenite-rich layer occurs at the top of UnitⅠ.Fe-Ti oxides include magnetite and ilmenite.Small amounts of cumulus and intercumulus magnetite occur in UnitsⅠandⅡ.Cumulus magnetite grains are commonly euhedral and enclosed within olivine and clinopyroxene.They have high Cr2O3 contents ranging from 6.02 to 22.5 wt.%,indicating that they are likely an early crystallized phase from magmas.Intercumulus magnetite that usually displays ilmenite exsolution occupies the interstices between cumulus olivine crystals and coexists with interstitial clinopyroxene and plagioclase.Intercumulus magnetite has Cr2O3 ranging from 1.65 to 6.18 wt.%, lower than cumulus magnetite.The intercumulus magnetite may have crystallized from the trapped liquid.Large amounts of magnetite in UnitⅢcontains Cr2O3（＆lt;0.28 wt.%） much lower than magnetite in UnitsⅠandⅡ.The magnetite in UnitⅢis proposed to be accumulated from a Fe-Ti-rich melt.The Fe-Ti-rich melt is estimated to contain 35.9 wt.%of SiO2,26.9 wt.%of FeOt,8.2 wt.%of TiO2,13.2 wt.%of CaO, 8.3 wt.%of MgO,5.5 wt.%of Al2O3 and 1.0 wt.%of P2O5.The composition is comparable with the Fe-rich melts in the Skaergaard and Sept Iles intrusions.Paired non-reactive microstructures,granophyre pockets and ilmenite-rich intergrowths,are representative of Si-rich melt and Fe-Ti-rich melt,and are the direct evidence for the existence of an immiscible Fe-Ti-rich melt that formed from an evolved ferro-basaltic magma.
基金Sponsored by Youth Fund Project of the National Natural Science Foundation of China(51608009)Youth Top Talent Training Project of Support Plan for the Construction of High-level Teachers of Beijing Municipal Colleges and Universities in 2019(CIT&TCD201904010).
文摘Improving rural living environment is an important support for farmers to live and work in peace and contentment,which is of great significance to the shaping of happy and livable homes in rural areas under the background of "beautiful countryside".Through the comprehensive renovation of the beautiful countryside,great progress has been made in improving the rural living environment in Beijing,but there are still problems in rural settlement landscape such as poor quality of landscape environment,low utilization rate of public space,and insufficient protection of traditional features.This study took the design strategy of rural settlement landscape as the research entry point,took the rural high-quality landscape environment demand and the beautiful rural construction goal as the double guidance,explored the design strategy of improving the quality of rural settlement landscape through the methods of field survey and questionnaire survey,and put forward the following design points:①From the perspective of overall consideration and advantage integration,the overall framework of rural settlement landscape should comprehensively consider rural architectural landscape and living environment landscape;②efforts should be made to create public spaces such as the village landscape image Avenue,landscape sharing garden,and open courtyard in front of the house,so as to improve the environmental quality and spatial vitality of the village;③strengthen the protection of the traditional features of the village,such as the famous ancient trees,the texture of the courtyard,the quality of residential buildings,etc.with a view to promoting the improvement and overall improvement of the rural environment.
文摘The Hebei Xinji Barium Salt Group Co. Ltd is the largest barium salt production and export base in the world. Major products include Five Continents brand industrial barium carbonate, high purity barium carbonate, precipitated barium sulphate, barium nitrate, industrial sodium sulphide, industrial sulfur, sodium thiosulfate and sodium hydrosulphide. The annual output of barium salt is 120,000 tons, 2/3 for export. In 1995, the export value was US$20 million. As early as in 1953, its sodium sulphide began to be exported and re-
文摘奥灰岩溶裂隙含水层是影响华北型煤矿深部开采的重要水害,在水-岩相互作用下奥灰含水层易导致煤层底板突水。为进一步认识奥灰岩溶突水问题,文章以新集矿区深部1煤层开采为例,利用矿区近些年最新积累的奥灰钻孔资料,选取断层强度指数、断层交叉点与尖灭点、含水层水压、富水性、隔水层等效厚度、脆塑比7个因素作为奥灰岩溶突水的主控因素,并结合层次分析法(analytic hierarchy process,AHP)确定各主控因素影响权重。运用地理信息系统(geographic information system,GIS)空间分析功能建立各主控因素专题图,通过对专题栅格图归一化处理,将各主控因素按照权重进行空间复合叠加,最终获得1煤层底板奥灰岩溶突水危险性评价分区结果。将评价结果与突水系数法计算结果对比分析可知,基于GIS的煤层底板突水危险性评价方法更符合矿区实际地质情况,可以为矿区深部煤层开采与水害防治工作提供参考依据。
文摘Xinji City, in the middle south of Hebei Province, has a tanning history of more than 400 years. The city boasted over 100 kinds of fur and leather products, over 300 workshops and shops and 24 foreign agencies in the early years of the Qing Dynasty (1644-1911). Since 1949, especially since 1981,the city’s tanning industry has witnessed a big leap. There are around 10, 000 tanning enterprises in the city with an annual industrial value of RMB 1.3 billion and an annual export value of US $
