Discovery of mafic granulites from the Altay orogenic belt; evidence from mineralogical study.
文献类型：期刊论文
| 作者 | Li, ZL; Chen, HL; Yang, SF; Xiao, WJ; Tainosho, Y |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2004-11-01 |
| 卷号 | 20期号:6页码:1445-1455 |
| 关键词 | Mafic granulite petrography mineral chemistry P-T conditions Altay orogenic belt |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | The Altay mafic granulite (AMG), representing metamorphic product of granulite-facies in the lower crust, was first found in the Fuyun Wuqiagou, Altay orogenic belt through detailed field survey and mineral-chemical study. The AMG consists of coarse-grained and fine-grained granulites with SiO2 contents of 47.83% similar to 53.57%, both of which have similar mineral assemblage of orthopyroxene, clinopyroxene, plagioclase, amphibole and brown biotite. Its mineral compositions of amphiboles and biotites are rich in Mg/(Mg + Fe2+), probably having relationship with whole-rock chemistry of the rocks. Mineral chemistry addresses that orthopyroxenes have higher Mg/(Mg + Fe2+) of 0.65 similar to 0.71, belonging to hypersthene, and having higher MgO + FeO contents, and lower Al2O3 contents and Ca/(Ca+Fe2+ + Mg) ratios. Clinopyroxenes have lower TiO2 and Al2O3. These chemical features indicate that orthopyroxenes and clinopyroxenes in the rocks have metamorphic genetics. Biotites and some amphiboles are Ti-enriched, replying products formed under high-T metamorphic conditions, and even granulite-facies conditions. Based on mineral paragenesis, mineral generation and mineral geothermobaromemter, the P-T conditions of peak and retrograde metamorphism of the AMG are 750 similar to 780degreesC, 0.6 similar to 0.7 GPa and 590 similar to 620degreesC, 0.23 similar to 0.37 GPa, respectively, and the former one implies the crustal depth of ca. 20 similar to 25 km. The discovery of the AMG has an important significance on further study of formation and structure of deeper crust in the Altay area and continental geodynamic mechanism in North Xinjiang, China and even Central Asia. |
| WOS关键词 | CRUSTAL GROWTH ; CHINA ; EVOLUTION ; AMPHIBOLES ; AREA ; AGE |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000226179100014 |
| 出版者 | SCIENCE CHINA PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/79535]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Li, ZL |
| 作者单位 | 1.Zhejiang Univ, Coll Sci, Dept Earth Sci, Hangzhou 310027, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 3.Kobe Univ, Fac Dev Sci, Kobe, Hyogo 6578501, Japan |
| 推荐引用方式 GB/T 7714 | Li, ZL,Chen, HL,Yang, SF,et al. Discovery of mafic granulites from the Altay orogenic belt; evidence from mineralogical study.[J]. ACTA PETROLOGICA SINICA,2004,20(6):1445-1455. |
| APA | Li, ZL,Chen, HL,Yang, SF,Xiao, WJ,&Tainosho, Y.(2004).Discovery of mafic granulites from the Altay orogenic belt; evidence from mineralogical study..ACTA PETROLOGICA SINICA,20(6),1445-1455. |
| MLA | Li, ZL,et al."Discovery of mafic granulites from the Altay orogenic belt; evidence from mineralogical study.".ACTA PETROLOGICA SINICA 20.6(2004):1445-1455. |
入库方式： OAI收割
来源：地质与地球物理研究所
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