High-pressure granulites in the Sanggan area, North China craton: metamorphic evolution, P-T paths and geotectonic significance
文献类型：期刊论文
| 作者 | Guo, JH; O'Brien, PJ; Zhai, M |
| 刊名 | JOURNAL OF METAMORPHIC GEOLOGY
 |
| 出版日期 | 2002-11-01 |
| 卷号 | 20期号:8页码:741-756 |
| 关键词 | high-pressure granulite reaction textures P-T paths Paleoproterozoic North China craton |
| ISSN号 | 0263-4929 |
| 文献子类 | Article |
| 英文摘要 | High-pressure basic granulites are widely distributed as enclaves and sheet-like blocks in the Huaian TTG gneiss terrane in the Sanggan area of the Central Zone of the North China craton. Four stages of the metamorphic history have been recognised in mineral assemblages based on inclusion, exsolution and reaction textures integrated with garnet zonation patterns as revealed by compositional maps and compositional profiles. The P-T conditions for each metamorphic stage were obtained using thermodynamically and experimentally calibrated geothermobarometers. The low-Ca core of growth-zoned garnet, along with inclusion minerals, defines a prograde assemblage (M1) of garnet + clinopyroxene + plagioclase + quartz, yielding 700 degreesC and 10 kbar. The peak of metamorphism at about 750-870 degreesC and 11-14.5 kbar (M2) is defined by high-Ca domains in garnet interiors and inclusion minerals of clinopyroxene, plagioclase and quartz. Kelyphites or coronas of orthopyroxene + plagioclase +/- magnetite around garnet porphyroblasts indicate garnet breakdown reactions (M3) at conditions around 770-830 degreesC and 8.5-10.5 kbar. Garnet exsolution lamellae in clinopyroxene and kelyphites of amphibole + plagioclase around garnet formed during the cooling process at about 500-650 degreesC and 5.5-8 kbar (M4). These results help de ne a sequential P-T path containing prograde, near-isothermal decompression (ITD) and near-isobaric cooling (IBC) stages. |
| WOS关键词 | PLAGIOCLASE-QUARTZ GEOBAROMETERS ; TEMPERATURE-TIME PATHS ; BASEMENT ROCKS ; REGIONAL METAMORPHISM ; CONTINENTAL-CRUST ; MOLDANUBIAN ZONE ; BOHEMIAN MASSIF ; GARNET ; PYROXENE ; BEARING |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000178798700003 |
| 出版者 | BLACKWELL PUBLISHING INC |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/77997]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Guo, JH |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Univ Potsdam, Inst Geowissensch, D-14415 Potsdam, Germany |
| 推荐引用方式 GB/T 7714 | Guo, JH,O'Brien, PJ,Zhai, M. High-pressure granulites in the Sanggan area, North China craton: metamorphic evolution, P-T paths and geotectonic significance[J]. JOURNAL OF METAMORPHIC GEOLOGY,2002,20(8):741-756. |
| APA | Guo, JH,O'Brien, PJ,&Zhai, M.(2002).High-pressure granulites in the Sanggan area, North China craton: metamorphic evolution, P-T paths and geotectonic significance.JOURNAL OF METAMORPHIC GEOLOGY,20(8),741-756. |
| MLA | Guo, JH,et al."High-pressure granulites in the Sanggan area, North China craton: metamorphic evolution, P-T paths and geotectonic significance".JOURNAL OF METAMORPHIC GEOLOGY 20.8(2002):741-756. |
入库方式： OAI收割
来源：地质与地球物理研究所
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