Metamorphism, zircon U-Pb dating and tectonic implications of garnet amphibolites from Hongliuxia, Dunhuang, Gansu Province
文献类型：期刊论文
| 作者 | Wang ZhongMei1,2,3; Xiao WenJiao1,2; Han ChunMing1,2; Ao SongJian1,2; Wang LuoJuan1,3 |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2013-05-01 |
| 卷号 | 29期号:5页码:1685-1697 |
| 关键词 | Garnet zonings Reaction textures Garnet-bearing amphibolites Zircon U-Pb dating Metamorphic evolution Tarim Craton |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | The protolith of the Hongliuxia amphibolites is tholeiite formed in immature arc, and the typical mineral assemblages are garnet ( Grt), amphibole ( Amp), diopside (Di) and plagioclase (Pl). The coarse-grain garnet porphyroblasts usually display obvious zonings. Petrographic and mineral chemistry indicate that the amphibolites have undergone four successive stages: prograde, peak, isothermal decompression and isobaric cooling. The prograde metamorphic assemblages ( M1) are the minerals preserved in garnet porphyroblasts ( Grt I + Amp I + Pl I + Qtz), and the P-T metamorphic conditions are estimated to be 550 degrees C to 600 degrees C and 0. 3 Gpa to 0. 5Gpa; the peak metamorphic assemblages (M2) are the mantle part of garnet and the minerals in the matrix ( Grt II + Amp II + Di + Pl II + Qtz), P-T estimates give peak metamorphic conditions of 650 degrees C to 780 degrees C and 0. 8 Gpa to 0. 9Gpa; the M3 stage is chatacterized by the Pl III + Amp III corona around garnet porphyroblasts, which infer an obvious decompression process, and the temperature of metamorphism is estimated to be 630 degrees C to 700 degrees C; the temperature of the M4 stage drop a lot, which is inferred from the breakdown of diopside to produce AmpIV + PlIV. The estimated P-T conditions indicate a clockwise P-T-t path. The tectonic evolution history is; plate subduction cause high-temperature metamorphism, after that the crust tends to be thin, then the deep rock cool down to the normal geothermal gradient. The crystallization age of garnet-bearing amphibolite is 1611 +/- 6Ma, which is contemporary to the breakup Columbia Supercontinent, so the Tarim Craton may connect with the breakup of Columbia Supercontinent. |
| WOS关键词 | HF ISOTOPIC COMPOSITIONS ; NORTH CHINA CRATON ; GEOCHEMICAL DISCRIMINATION ; STANDARD ZIRCONS ; PRESSURE ; TEMPERATURE ; HORNBLENDE ; EVOLUTION ; ROCKS ; THERMOBAROMETRY |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000321226200016 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/86894]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Wang ZhongMei |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 2.Xinjiang Res Ctr Mineral Resources, Urumqi 830011, Peoples R China 3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
| 推荐引用方式 GB/T 7714 | Wang ZhongMei,Xiao WenJiao,Han ChunMing,et al. Metamorphism, zircon U-Pb dating and tectonic implications of garnet amphibolites from Hongliuxia, Dunhuang, Gansu Province[J]. ACTA PETROLOGICA SINICA,2013,29(5):1685-1697. |
| APA | Wang ZhongMei,Xiao WenJiao,Han ChunMing,Ao SongJian,&Wang LuoJuan.(2013).Metamorphism, zircon U-Pb dating and tectonic implications of garnet amphibolites from Hongliuxia, Dunhuang, Gansu Province.ACTA PETROLOGICA SINICA,29(5),1685-1697. |
| MLA | Wang ZhongMei,et al."Metamorphism, zircon U-Pb dating and tectonic implications of garnet amphibolites from Hongliuxia, Dunhuang, Gansu Province".ACTA PETROLOGICA SINICA 29.5(2013):1685-1697. |
入库方式： OAI收割
来源：地质与地球物理研究所
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