The Kyaikhto gold district is located within the Slate Belt and Mogok Metamorphic Belt of Southern Myanmar. The study area is covered by Carboniferous to Lower Permian metasedimentary rocks consisting of slate, phylli...The Kyaikhto gold district is located within the Slate Belt and Mogok Metamorphic Belt of Southern Myanmar. The study area is covered by Carboniferous to Lower Permian metasedimentary rocks consisting of slate, phyllite, and schist of the Mergui Group, intruded by later igneous rocks. Four gold occurrences have been identified in the Kyaikhto district: the Kunzeik in the north, Zibyaung, and Thae Phyu Chaung in the center and Meyon in the south. Gold mineralization in the Kyaikhto district is associated with sheeted, stockwork, dissemination, and sulfide-bearing quartz veins. Ore minerals recognized include sphalerite, galena, chalcopyrite, molybdenite and pyrite with minor native gold and electrum. Two types of fluid inclusions were examined in the quartz samples of the Kunzeik and Zibyaung—Type A: aqueous carbonic fluid inclusions and Type B: aqueous fluid inclusions. At the Kunzeik, Type A fluid inclusions homogenize at temperatures from 296°C to 376°C with low salinities (1.6 - 4.6 wt% NaCl equivalent). The homogenization temperatures of Type B fluid inclusions in vein quartz range from 246°C to 312°C, with salinities of between 1.2 and 10.7 wt% NaCl equivalent. In the Zibyaung, the homogenization temperatures of Type A inclusions vary from 305°C to 378°C, with salinities from 4.6 to 9.6 wt% NaCl equivalent. The homogenization temperatures of Type B fluid inclusions mainly range from 242°C to 298°C, with salinities from 0.9 to 11.8 wt% NaCl equivalent. These characteristics of fluid inclusions are similar to those of orogenic gold mineralization systems.展开更多
How to realise the goal of city revival through the preservation of historic districts is an important issue for all historic cities.This article introduces the Preservation and Renovation Project of Zhongshan Road in...How to realise the goal of city revival through the preservation of historic districts is an important issue for all historic cities.This article introduces the Preservation and Renovation Project of Zhongshan Road in Hangzhou regarding its guiding principles,design concepts,and the entire construction process.In this project,the existing historical buildings along Zhongshan Road were preserved by keeping the remains of different historical periods and various lifestyles of the inhabitants.Rather than merely refurbishing the street front only,we reconstructed the Southern Song Dynasty city-block walls along Zhongshan Road and restored the Fangxiang city fabric to create the streetscape of the former Imperial Avenue.Afforested terraced teahouses were built along the road,and the original water system was restored so as to realise the atmosphere of‘watertown’.New buildings were added by adopting local materials and vernacular building forms.The article summarises two strategies for the preservation of a historic district in a large city.One is the comprehensive project planning by research and investigation.The other is the overall design guideline for the street blocks.It also reflects on the disappointing aspects that mainly resulted from time limitations and the poor taste in the refurbishment of shop houses.展开更多
Introduction The rectangular block of Proterozoic formation lying between north of the Singhbhum Mobile Belt(SMB,2.3-2.4 Ga,Saha 1994),Neogene sediments of the Bengal basin and the Quaternary-Recent alluvium of the Ganga
文摘The Kyaikhto gold district is located within the Slate Belt and Mogok Metamorphic Belt of Southern Myanmar. The study area is covered by Carboniferous to Lower Permian metasedimentary rocks consisting of slate, phyllite, and schist of the Mergui Group, intruded by later igneous rocks. Four gold occurrences have been identified in the Kyaikhto district: the Kunzeik in the north, Zibyaung, and Thae Phyu Chaung in the center and Meyon in the south. Gold mineralization in the Kyaikhto district is associated with sheeted, stockwork, dissemination, and sulfide-bearing quartz veins. Ore minerals recognized include sphalerite, galena, chalcopyrite, molybdenite and pyrite with minor native gold and electrum. Two types of fluid inclusions were examined in the quartz samples of the Kunzeik and Zibyaung—Type A: aqueous carbonic fluid inclusions and Type B: aqueous fluid inclusions. At the Kunzeik, Type A fluid inclusions homogenize at temperatures from 296°C to 376°C with low salinities (1.6 - 4.6 wt% NaCl equivalent). The homogenization temperatures of Type B fluid inclusions in vein quartz range from 246°C to 312°C, with salinities of between 1.2 and 10.7 wt% NaCl equivalent. In the Zibyaung, the homogenization temperatures of Type A inclusions vary from 305°C to 378°C, with salinities from 4.6 to 9.6 wt% NaCl equivalent. The homogenization temperatures of Type B fluid inclusions mainly range from 242°C to 298°C, with salinities from 0.9 to 11.8 wt% NaCl equivalent. These characteristics of fluid inclusions are similar to those of orogenic gold mineralization systems.
文摘How to realise the goal of city revival through the preservation of historic districts is an important issue for all historic cities.This article introduces the Preservation and Renovation Project of Zhongshan Road in Hangzhou regarding its guiding principles,design concepts,and the entire construction process.In this project,the existing historical buildings along Zhongshan Road were preserved by keeping the remains of different historical periods and various lifestyles of the inhabitants.Rather than merely refurbishing the street front only,we reconstructed the Southern Song Dynasty city-block walls along Zhongshan Road and restored the Fangxiang city fabric to create the streetscape of the former Imperial Avenue.Afforested terraced teahouses were built along the road,and the original water system was restored so as to realise the atmosphere of‘watertown’.New buildings were added by adopting local materials and vernacular building forms.The article summarises two strategies for the preservation of a historic district in a large city.One is the comprehensive project planning by research and investigation.The other is the overall design guideline for the street blocks.It also reflects on the disappointing aspects that mainly resulted from time limitations and the poor taste in the refurbishment of shop houses.
文摘Introduction The rectangular block of Proterozoic formation lying between north of the Singhbhum Mobile Belt(SMB,2.3-2.4 Ga,Saha 1994),Neogene sediments of the Bengal basin and the Quaternary-Recent alluvium of the Ganga
