Zircon U―Pb Geochronology of High-Pressure Granulite and Its Tectonic Implications in the Dulan Area, North Qaidam Mountains, Western Chinaoft-com:office:office" />
- 责任者：Yu Shengyao (Institute of Geology ; Chinese Academy of Geological Sciences ; Beijing 100037 ; China) ; Zhang Jianxin
- 刊名：Acta Petrologica et Mineralogica
- 出版年：2010
- 卷期：29(2)
- 关键词：麻粒岩 ; granulite ; 铀―铅计时 ; 柴达木盆地 ; Qaidam Basin
- 页码：p.139-150
- 图表：7 illus., 2 tables, 42 refs.
- 分类号：0803,1300
- issnNo：ISSN1000-6524
- isbnNo：CN11-1966/P
Based on microstructure and reaction textures, the authors have recognized three main metamorphic stages from the high-pressure granulite: 1) high-pressure granulite facies; 2) retrogression began at the high amphibolite facies stage (M2); 3) subsequent retrogression occurred at the green-schist/high-amphibolite facies stage (M3). Combined with cathodoluminescence patterns and mineral inclusions, U-Pb dating of zircons revealed that the peak metamorphism age of the high-pressure granulite-facies is 466.9±6.5 Ma. Petrological and chronological studies suggest that the granulite and adjacent eclogite were formed in different thermal environments of the same subduction zone. The high-pressure granulite experienced its unique metamorphic history, and was not associated with the action of thermal relaxation after the eclogite-facies metamorphism recorded in adjacent eclogites. oft-com:office:office" />