Zn-Rich Spinel in Association with Quartz in the Al-Rich Metapelites from the Mashan Khondalite Series, NE China  

作　　者：Xinzhuan Guo Akira Takasu Yongjiang Liu Weimin Li 

机构地区：[1]Institute for Study of the Earth's Interior, Okayama University [2]Department of Geoscience, Shimane University [3]College of Earth Sciences, Jilin University

出　　处：《Journal of Earth Science》2014年第2期207-223,共17页地球科学学刊（英文版）

基　　金：supported by a JSPS Grant-in-Aid for Scientific Research (No. 17340149) to Akira Takasu;by the NSFS of China (No. 40739905) to Yongjiang Liu;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

摘　　要：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.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.

关 键 词：Al-rich metapelites Mashan complex KHONDALITE spinel＋quartz granulite. 

分 类 号：P618.45[天文地球—矿床学]