Study on oxygen isotope of high-pressure veins and host-rocks from western Tianshan in China: implications for deep fluids flow and the characteristic of subduction.
文献类型：期刊论文
| 作者 | Huang, DZ; Gao, J; Zhang, JF; Zhang, DX; Dai, TG; Klemd, R |
| 刊名 | ACTA PETROLOGICA SINICA
 |
| 出版日期 | 2006 |
| 卷号 | 22期号:1页码:74-82 |
| 关键词 | high-pressure vein host-rocks oxygen isotope deep fluids in subduction zones western Tianshan |
| ISSN号 | 1000-0569 |
| 文献子类 | Article |
| 英文摘要 | The western Tianshan high-pressure (HP) metamorphic belt, which is probably to represent paleosubduction melange of Paleozoic south Tianshan ocean between the Yili-central Tianshan and Tarim plates, is situated in the south Tianshan Mountains in China. High-pressure veins are extensively developed in this HP belt. Analyses of oxygen isotope of main HP-metamorphic mineral separates and whole rocks are conducted for HP veins and host rocks in order to get inquiring into the sources and flows of deep fluids in the paleo-subduction zone and the characteristic of the subduction of the slab. The delta O-18 values of high-pressure vein are from 8.28 parts per thousand to +10.70 parts per thousand, most of which are at the range of +9.50 parts per thousand +/- 1. The metabasic host rocks have the similar range of delta O-18 values ( +9.25 parts per thousand similar to +10.10 parts per thousand) to the high-pressure veins. Both of veins and host rocks don't show large variations in delta O-18 values. The variations in oxygen isotope ratios between a vein and its host rocks or between the center and the rim of a single vein are irregular. Generally, these variations are not significant. For most pairs, the variations in delta O-18 values are less than 1 parts per thousand. Contrary to whole rocks, mineral separates show a very large range of oxygen isotopic composition. The delta O-18 values of quartz, garnet and omphacite separates are +11.40 parts per thousand similar to +15.20 parts per thousand, +3.59 parts per thousand similar to +11.60 parts per thousand and +8.30 parts per thousand similar to +13.05 parts per thousand separately. Phengites and glaucophanes show narrow ranges of delta O-18 value, which are +10.00 parts per thousand similar to +11.10 parts per thousand and +9.26 parts per thousand similar to +9.94 parts per thousand respectively. The oxygen isotope fractionations between various HP metamorphic minerals in eclogitic rocks from western Tianshan are extensively disequilibria at peak metamorphic temperature. The data of oxygen isotope of whole rocks indicates that the deep fluids in the paleosubduction zones mainly originated from adjacent host-rocks. The extensively disequilibria of oxygen isotope fractionations between minerals probably shows that the subduction and exhumation of the subducted slap are rapidly, and external fluids incorporated into the deep fluids in the palcosubduction zones. |
| WOS关键词 | AMERICAN VOLCANIC ARC ; HP-LT ROCKS ; NW CHINA ; HYDROTHERMAL ALTERATION ; METAMORPHIC ROCKS ; TRACE-ELEMENT ; PB ISOTOPE ; TECTONIC IMPLICATIONS ; NORTHWESTERN CHINA ; AGE CONSTRAINTS |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000235920900008 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/66790]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Huang, DZ |
| 作者单位 | 1.Cent S Univ China, Sch Geol Sci & Environm Engn, Changsha 410083, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 3.Univ Wurzburg, Mineralog Inst, D-97074 Wurzburg, Germany |
| 推荐引用方式 GB/T 7714 | Huang, DZ,Gao, J,Zhang, JF,et al. Study on oxygen isotope of high-pressure veins and host-rocks from western Tianshan in China: implications for deep fluids flow and the characteristic of subduction.[J]. ACTA PETROLOGICA SINICA,2006,22(1):74-82. |
| APA | Huang, DZ,Gao, J,Zhang, JF,Zhang, DX,Dai, TG,&Klemd, R.(2006).Study on oxygen isotope of high-pressure veins and host-rocks from western Tianshan in China: implications for deep fluids flow and the characteristic of subduction..ACTA PETROLOGICA SINICA,22(1),74-82. |
| MLA | Huang, DZ,et al."Study on oxygen isotope of high-pressure veins and host-rocks from western Tianshan in China: implications for deep fluids flow and the characteristic of subduction.".ACTA PETROLOGICA SINICA 22.1(2006):74-82. |
入库方式： OAI收割
来源：地质与地球物理研究所
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