Petrogenesis of eclogites enclosed in mantle-derived peridotites from the Sulu UHP terrane: constraints from trace elements in minerals and Hf isotopes in zircon
文献类型：期刊论文
| 作者 | Zhang, R. Y.1; Liou, J. G.1; Zheng, J. R.2; Griffin, W. L.3; Yang, Y. -H.4; Jahn, B. -M.5 |
| 刊名 | LITHOS
 |
| 出版日期 | 2009-05-01 |
| 卷号 | 109期号:3-4页码:176-192 |
| 关键词 | Eclogite Garnet peridotite Trace elements Hf isotope Zircon Sulu UHP terrane |
| ISSN号 | 0024-4937 |
| DOI | 10.1016/j.lithos.2008.08.002 |
| 文献子类 | Article |
| 英文摘要 | Garnet clinopyroxenite and eclogite lenses are widespread in mantle-derived garnet peridotites from the Sulu UHP terrane, eastern China. In order to constrain their origin, major and trace element compositions of minerals from 6 eclogites and one garnet clinopyroxenite, and Hf isotopes of zircons from one eclogite, were analyzed by electron probe, LA-ICP-MS and LA- (MC) ICP-MS, respectively. Eclogitic garnets show a large variation in composition (Alm(20-48)Prp(24-50)Grs(15-38)Sps(1)), weakly correlated with garnets in their host peridotites. Garnets show LREE depletion and flat HREE patterns, with La(n) of 0.02-0.52 and Lu(n) of 5-75. Some garnets show zoning in HREE and Y with a U-shaped, concave-downward profile, but locally exhibit positive sharp variations in HREE and Y contents; such feature reflects disturbance in chemical-physical conditions during garnet growth. Clinopyroxene exhibits humped (mostly) or sinusoidal REE patterns, with La(n) of 0.3-6.0, Nd(n) of 2-14 and (La/Lu)(n) of 1.8-113 with a few exceptions. Partition coefficients of REE (D) between coexisting clinopyroxene and garnet in eclogite show a large variation: D(LREE) and D(HREE) ranging from 10 to 100 and from 0.1 to 0.01, respectively, similar to D(REE) values of the natural systems at 800-1100 degrees C. The D values (0.1-1) of HREE between Cpx and Grt from Grt clinopyroxenite and one eclogite differ distinctly from the other eclogites, which are consistent with high-T experimental data on garnet lherzolites. Zircons from the Xugou eclogite have no inherent core, which have low U/Th (most<0.20) and (176)Lu/(177)Hf (0.000008-0.0000637), and relative high (176)Hf/(177)Hf (0.28241-0.28262) ratios. These features indicate a metamorphic signature, and document that metasomatism affected the eclogite protolith. The model ages (Tom,) of zircons mostly cluster around 1.0-1.1 Ga, which probably reflects the metasomatic source. Bulk compositions of eclogite and Grt clinopyroxenite differ from those of Sulu eclogites in gneiss and MORB. The protoliths of these rocks may reflect the intrusion of asthenosphere-derivedmelts in Proterozoic. Eclogites with convex REE pattern and garnet clinopyroxenite Were formed by high-pressure crystal accumulation whereas the LREE-enriched eclogites may represent crystallized melt; both eclogite and clinopyroxenite together with their host peridotite were metamorphosed at 700-965 degrees C and >= 4 GPa during the Triassic northward subduction of the Yangtze craton. (C) 2008 Elsevier B.V. All rights reserved. |
| WOS关键词 | ULTRAHIGH-PRESSURE METAMORPHISM ; COESITE-BEARING ECLOGITE ; MID-ATLANTIC RIDGE ; EASTERN CHINA ; U-PB ; LU-HF ; XENOLITHIC ECLOGITES ; GARNET PERIDOTITES ; DETRITAL ZIRCONS ; BOHEMIAN MASSIF |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| WOS记录号 | WOS:000265734000004 |
| 出版者 | ELSEVIER SCIENCE BV |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/71156]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Zhang, R. Y. |
| 作者单位 | 1.Stanford Univ, Dept Geol & Environm Sci, Stanford, CA 94305 USA 2.China Univ Geosci, Fac Earth Sci, Wuhan 430074, Peoples R China 3.Macquarie Univ, Dept Earth & Planetary Sci, GEMOC ARC Natl Key Ctr, N Ryde, NSW 2109, Australia 4.Chinese Acad Sci, Inst Geol & Geophys, Beijing 100029, Peoples R China 5.Acad Sinica, Inst Earth Sci, Taipei 115, Taiwan |
| 推荐引用方式 GB/T 7714 | Zhang, R. Y.,Liou, J. G.,Zheng, J. R.,et al. Petrogenesis of eclogites enclosed in mantle-derived peridotites from the Sulu UHP terrane: constraints from trace elements in minerals and Hf isotopes in zircon[J]. LITHOS,2009,109(3-4):176-192. |
| APA | Zhang, R. Y.,Liou, J. G.,Zheng, J. R.,Griffin, W. L.,Yang, Y. -H.,&Jahn, B. -M..(2009).Petrogenesis of eclogites enclosed in mantle-derived peridotites from the Sulu UHP terrane: constraints from trace elements in minerals and Hf isotopes in zircon.LITHOS,109(3-4),176-192. |
| MLA | Zhang, R. Y.,et al."Petrogenesis of eclogites enclosed in mantle-derived peridotites from the Sulu UHP terrane: constraints from trace elements in minerals and Hf isotopes in zircon".LITHOS 109.3-4(2009):176-192. |
入库方式： OAI收割
来源：地质与地球物理研究所
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