Origin of the deep fluids in the paleosubduction zones in western Tianshan: Evidence from Pb- and Sr-isotope compositions of high-pressure veins and host rocks
文献类型：期刊论文
| 作者 | Huang, DZ; Gao, J; Dai, TG; Zou, HY; Xiong, XM; Klemd, R |
| 刊名 | SCIENCE IN CHINA SERIES D-EARTH SCIENCES
 |
| 出版日期 | 2005-10-01 |
| 卷号 | 48期号:10页码:1627-1636 |
| 关键词 | Deep Fluids In The Subduction Zones Pb- And Sr-isotope High Pressure Vein Host Rock Western Tianshan |
| ISSN号 | 1006-9313 |
| DOI | 10.1360/02yd0284 |
| 文献子类 | Article |
| 英文摘要 | Fluids in the deep subduction zones play an important role in crust-mantle ex-change related to the subduction process. Identification of fluids origin, internal or external, can help us to evaluate the contribution of crust materials to mantle during this process. High-pressure veins, which developed in the western Tianshan HP-metamorphic belt extensively, are the direct products of the fluids in subduction zones. In western Tianshan, high-pressure veins and host rocks have overall Pb- and Sr-isotope compositions. At t = 340 Ma, the high-pressure metamorphic time, the ratios of (206)Pb/(204)Pb, (207)Pb/(204)Pb, (208)Pb/(204)Pb and (87)Sr/(86)Sr of high pressure veins are 17.122-18.431, 15.477-15.611, 37.432-38.689 and 0.70529-0.70705, and are 17.605-17.834, 15.508-15.564, 37.080-38.145 and 0.70522-0.70685 for host rocks. However, high-pressure veins show a much larger variation in Pb-isotope compositions than host rocks. Plots of samples are distributed roughly along a line parallel to and far away from the Northern Hemisphere reference line (NHRL) on the plot of (206)Pb/(204)Pb vs (207)Pb/(204)Pb. On the plot of (206)Pb/(204)Pb vs (208)Pb/(204)Pb, plots of data are distributed nearby mid-ocean-ridge basalts (MORB) area or along a line parallel to and not far away from NHRL, which shows that the data plots are farther away from MORB and ocean island basalts (0113) areas on the plot of (206)Pb/(214)Pb vs (207)Pb/(204)Pb than on the plot of (206)Pb/(204)Pb vs (208)Pb/(204)Pb. The compositions of Pb- and Sr-isotopes of these high-pressure metamorphic rocks are between that of enriched mantle 1 (EMI) and of sediments or upper crust. A notable characteristic can be seen from plots of Pb-isotope ratio vs Pb-isotope ratio and (206)Pb/(204)Pb vs (87)Sr/(86)Sr that array of plots shows an evident tendency of mixture of two end members. Ratios of Rb/Ba, Ce/Pb, Nb/U and Ta/U of high-pressure veins and host rocks are between that of OIB or MORB and that of continental crust, which indicates that continental crust materials probably have been incorporated into the rocks. The fluids in the paleosubduction zones in western Tianshan are mixtures of two sources, one originating from the devolatilzation of the host rocks with protolithes similar to ocean basalts from enriched mantle 1 (EMI), the other from the dehydration of subducted sediments. |
| WOS关键词 | NORTHWESTERN CHINA ; ARC LAVAS ; TECTONIC IMPLICATIONS ; EXHUMATION MECHANISM ; CONTINENTAL-CRUST ; NW CHINA ; MANTLE ; SUBDUCTION ; CONSTRAINTS ; SYSTEMATICS |
| WOS研究方向 | Geology |
| 语种 | 英语 |
| WOS记录号 | WOS:000233344000005 |
| 出版者 | SCIENCE PRESS |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/65508]  |
| 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, Inst Geol, Changsha 410083, Peoples R China 2.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 3.Univ Wurzburg, Inst Mineral, D-97074 Wurzburg, Germany |
| 推荐引用方式 GB/T 7714 | Huang, DZ,Gao, J,Dai, TG,et al. Origin of the deep fluids in the paleosubduction zones in western Tianshan: Evidence from Pb- and Sr-isotope compositions of high-pressure veins and host rocks[J]. SCIENCE IN CHINA SERIES D-EARTH SCIENCES,2005,48(10):1627-1636. |
| APA | Huang, DZ,Gao, J,Dai, TG,Zou, HY,Xiong, XM,&Klemd, R.(2005).Origin of the deep fluids in the paleosubduction zones in western Tianshan: Evidence from Pb- and Sr-isotope compositions of high-pressure veins and host rocks.SCIENCE IN CHINA SERIES D-EARTH SCIENCES,48(10),1627-1636. |
| MLA | Huang, DZ,et al."Origin of the deep fluids in the paleosubduction zones in western Tianshan: Evidence from Pb- and Sr-isotope compositions of high-pressure veins and host rocks".SCIENCE IN CHINA SERIES D-EARTH SCIENCES 48.10(2005):1627-1636. |
入库方式： OAI收割
来源：地质与地球物理研究所
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