Al-rich metapelites from the Mashan khondalite series are characterized by the assem- blage Spl＋Grt＋Sil＋Crd＋Bt＋Pi （An72）＋Kfs＋Quartz＋graphite. Large amounts of spinel＋quartz assem- blages occur as inclusions...Al-rich metapelites from the Mashan khondalite series are characterized by the assem- blage Spl＋Grt＋Sil＋Crd＋Bt＋Pi （An72）＋Kfs＋Quartz＋graphite. Large amounts of spinel＋quartz assem- blages occur as inclusions in garnet and prismatic sillimanite in the Ai-rich metapelites of the Mashan complex, NE China. The chemical composition of spinel is characterized by Zn-rich （Xzn=0.33-0.40. Xzn=Zn/Zn＋Mg＋Fe＊） （Fe＊=FeZ＋＋Fe3＋） and Fe3＋ rich （up to 0.31 p.f.u.）. The characteristic chemical composition and the mineral association indicated that the formation of spinel and quartz assemblage may be due to the breakdown of Zn-rich staurolite. The geothermobarometers studies show that the peak temperature of the Mashan complex is around 820 ℃ and the peak pressures is 8.0 kbar. The Mashan complex shows a typical orogen style P-T path.展开更多
There are many branches of the Miao people in China, one of which is the Mashan Miao, who have been living in karst mountainous areas in southwest Guizhou Province. The Mashan Miao have adopted various measures for th...There are many branches of the Miao people in China, one of which is the Mashan Miao, who have been living in karst mountainous areas in southwest Guizhou Province. The Mashan Miao have adopted various measures for the conservation and effective utilization of the local ecological system and have made great achievements in this area. From the 1950s, their social environment has changed a lot due to political and economic movements. The rocky desertification in the Mashan area has gradually expanded. After the 1990s, relief work was carried out to address the desertification problem, but it was not very effective. We have been doing fieldwork in this area for more than 20 years and from our fieldwork records, we have found that the local Miao people have traditional ecological knowledge and skills that are of irreplaceable valuable for finding a solution for rocky desertification. Using the Miao knowledge we think a feasible way to control this disaster can be found.展开更多
基金supported by a JSPS Grant-in-Aid for Scientific Research (No. 17340149) to Akira Takasuby the NSFS of China (No. 40739905) to Yongjiang Liu+1 种基金by the 973 project of the Ministry of Science and Technology of China (No. 2013CB429802)by the National Natural Science Foundation for the Youth of China (No. 41302175) to Weimin Liu
文摘Al-rich metapelites from the Mashan khondalite series are characterized by the assem- blage Spl＋Grt＋Sil＋Crd＋Bt＋Pi （An72）＋Kfs＋Quartz＋graphite. Large amounts of spinel＋quartz assem- blages occur as inclusions in garnet and prismatic sillimanite in the Ai-rich metapelites of the Mashan complex, NE China. The chemical composition of spinel is characterized by Zn-rich （Xzn=0.33-0.40. Xzn=Zn/Zn＋Mg＋Fe＊） （Fe＊=FeZ＋＋Fe3＋） and Fe3＋ rich （up to 0.31 p.f.u.）. The characteristic chemical composition and the mineral association indicated that the formation of spinel and quartz assemblage may be due to the breakdown of Zn-rich staurolite. The geothermobarometers studies show that the peak temperature of the Mashan complex is around 820 ℃ and the peak pressures is 8.0 kbar. The Mashan complex shows a typical orogen style P-T path.
基金Ministry of Education for New Century Excellent Talents Program (NCET-10-0146) National Social Science Foundation of China (08AJY025)
文摘There are many branches of the Miao people in China, one of which is the Mashan Miao, who have been living in karst mountainous areas in southwest Guizhou Province. The Mashan Miao have adopted various measures for the conservation and effective utilization of the local ecological system and have made great achievements in this area. From the 1950s, their social environment has changed a lot due to political and economic movements. The rocky desertification in the Mashan area has gradually expanded. After the 1990s, relief work was carried out to address the desertification problem, but it was not very effective. We have been doing fieldwork in this area for more than 20 years and from our fieldwork records, we have found that the local Miao people have traditional ecological knowledge and skills that are of irreplaceable valuable for finding a solution for rocky desertification. Using the Miao knowledge we think a feasible way to control this disaster can be found.
