P-T evolution of glaucophane-omphacite bearing HP-LT rocks in the western Tianshan Orogen, NW China: new evidence for 'Alpine-type' tectonics
文献类型：期刊论文
| 作者 | Klemd, R; Schroter, FC; Will, TM; Gao, J |
| 刊名 | JOURNAL OF METAMORPHIC GEOLOGY
 |
| 出版日期 | 2002-02-01 |
| 卷号 | 20期号:2页码:239-254 |
| 关键词 | 'Alpine-type' tectonics blueschist eclogite P-T path P-T-pseudosections western Tianshan |
| ISSN号 | 0263-4929 |
| 文献子类 | Article |
| 英文摘要 | The late Palaeozoic western Tianshan high-pressure/low-temperature belt extends for about 200 km along the south-central Tianshan suture zone and is composed mainly of blueschist, eclogite and epidote amphibolite/greenschist facies rocks. P-T conditions of mafic garnet omphacite and garnet-omphacite blueschist, which are interlayered with eclogite, were investigated in order to establish an exhumation path for these high-pressure rocks. Maximum pressure conditions are represented by the assemblage garnet-omphacite-paragonite-phengite-glaucophane-quartz-rutile. Estimated maximum pressures range between 18 and 21 kbar at temperatures between 490 and 570 degreesC. Decompression caused the destabilization of omphacite, garnet and glaucophane to albite, Ca-amphibole and chlorite. The post-eclogite facies metamorphic conditions between 9 and 14 kbar at 480 570 degreesC suggest an almost isothermal decompression from eclogite to epidote-amphibolite facies conditions. Prograde growth zoning and mineral inclusions in garnet as well as post-eclogite facies conditions are evidence for a clockwise P-T path. Analysis of phase diagrams constrains the P-T path to more or less isothermal cooling which is well corroborated by the results of geothermobarometry and mineral textures. This implies that the high-pressure rocks from the western Tianshan Orogen formed in a tectonic regime similar to 'Alpine-type' tectonics. This contradicts previous models which favour 'Franciscan-type' tectonics for the southern Tianshan high-pressure rocks. |
| WOS关键词 | HIGH-PRESSURE METAMORPHISM ; TEMPERATURE TIME PATHS ; REGIONAL METAMORPHISM ; NORTHWESTERN CHINA ; PHASE-RELATIONS ; BLUESCHIST ; PLAGIOCLASE ; THERMOBAROMETRY ; TRANSFORMATION ; NOMENCLATURE |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000174028500002 |
| 出版者 | WILEY-BLACKWELL |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/77419]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Klemd, R |
| 作者单位 | 1.Univ Wurzburg, Inst Mineral, D-97074 Wurzburg, Germany 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China |
| 推荐引用方式 GB/T 7714 | Klemd, R,Schroter, FC,Will, TM,et al. P-T evolution of glaucophane-omphacite bearing HP-LT rocks in the western Tianshan Orogen, NW China: new evidence for 'Alpine-type' tectonics[J]. JOURNAL OF METAMORPHIC GEOLOGY,2002,20(2):239-254. |
| APA | Klemd, R,Schroter, FC,Will, TM,&Gao, J.(2002).P-T evolution of glaucophane-omphacite bearing HP-LT rocks in the western Tianshan Orogen, NW China: new evidence for 'Alpine-type' tectonics.JOURNAL OF METAMORPHIC GEOLOGY,20(2),239-254. |
| MLA | Klemd, R,et al."P-T evolution of glaucophane-omphacite bearing HP-LT rocks in the western Tianshan Orogen, NW China: new evidence for 'Alpine-type' tectonics".JOURNAL OF METAMORPHIC GEOLOGY 20.2(2002):239-254. |
入库方式： OAI收割
来源：地质与地球物理研究所
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