Lithium isotopic systematics of peridotite xenoliths from Hannuoba, North China Craton: Implications for melt-rock interaction in the considerably thinned lithospheric mantle
文献类型：期刊论文
| 作者 | Tang, Yan-Jie; Zhang, Hong-Fu; Nakamura, Eizo; Moriguti, Takuya; Kobayashi, Katsura; Ying, Ji-Feng |
| 刊名 | GEOCHIMICA ET COSMOCHIMICA ACTA
 |
| 出版日期 | 2007-09-01 |
| 卷号 | 71期号:17页码:4327-4341 |
| ISSN号 | 0016-7037 |
| DOI | 10.1016/j.gca.2007.07.006 |
| 文献子类 | Article |
| 英文摘要 | Li concentrations and isotopic compositions of coexisting minerals (ol, opx, and cpx) from peridotite xenoliths entrained in the Hannuoba Tertiary basalts, North China Craton, provide insight into Li isotopic fractionation between mantle minerals during melt-rock interaction in the considerably thinned lithospheric mantle. Bulk analyses of mineral separates show significant enrichment of Li in cpx (2.4-3.6 ppm) relative to olivine (1.2-1.8 ppm), indicating that these peridotites have been affected by mantle metasomatism with mafic silicate melts. Bulk olivine separates (delta Li-7 similar to +3.3 parts per thousand to +6.4 parts per thousand) are isotopically heavier than coexisting pyroxenes (delta Li-7 similar to -3.3 parts per thousand to -8.2 parts per thousand in cpx, and -4.0 parts per thousand to -6.7 parts per thousand in opx). Such large variation suggests Li elemental and isotopic disequilibrium. This conclusion is supported by results from in situ SIMS analyses of mineral grains where significant Li elemental and isotopic zonations exist. The olivine and opx have lower Li concentrations and heavier Li isotopes in the rims than in the cores. This reverse correlation of delta Li-7 with Li concentrations indicates diffusive fractionation of Li isotopes. However, the zoning patterns in coexisting cpx show isotopically heavier rims with higher Li abundances. This positive correlation between delta Li-7 and Li concentrations suggests a melt mixing trend. We attribute Li concentration and isotope zonation in minerals to the effects of two-stage diffusive fractionation coupled with melt-rock interaction. The earliest melts may have been derived from the subducted oceanic slab with low delta Li-7 values produced by isotopic fractionation during the dehydration of the seawater-altered slab. Melts at later stages were derived from the astheno-sphere and interacted with the peridotites, producing the Li elemental and isotopic zoning in mineral grains. These data thus provide evidence for multiple-stage peridotite-melt interaction in the lithospheric mantle beneath the northern North China Craton. (C) 2007 Elsevier Ltd. All rights reserved. |
| WOS关键词 | SINO-KOREAN CRATON ; SLAB-DERIVED FLUIDS ; VOLCANIC ARC LAVAS ; CONTINENTAL-CRUST ; MESOZOIC BASALTS ; EASTERN CHINA ; OCEANIC-CRUST ; SUBARC MANTLE ; ICP-MS ; FRACTIONATION |
| WOS研究方向 | Geochemistry & Geophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000249365000014 |
| 出版者 | PERGAMON-ELSEVIER SCIENCE LTD |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/67200]  |
| 专题 | 中国科学院地质与地球物理研究所 |
| 通讯作者 | Tang, Yan-Jie |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evol, Beijing 100029, Peoples R China 2.Okayama Univ, Inst Study Earths Interior, Pheasant Mem Lab Geochem & Cosmochem, Tottori 6820193, Japan |
| 推荐引用方式 GB/T 7714 | Tang, Yan-Jie,Zhang, Hong-Fu,Nakamura, Eizo,et al. Lithium isotopic systematics of peridotite xenoliths from Hannuoba, North China Craton: Implications for melt-rock interaction in the considerably thinned lithospheric mantle[J]. GEOCHIMICA ET COSMOCHIMICA ACTA,2007,71(17):4327-4341. |
| APA | Tang, Yan-Jie,Zhang, Hong-Fu,Nakamura, Eizo,Moriguti, Takuya,Kobayashi, Katsura,&Ying, Ji-Feng.(2007).Lithium isotopic systematics of peridotite xenoliths from Hannuoba, North China Craton: Implications for melt-rock interaction in the considerably thinned lithospheric mantle.GEOCHIMICA ET COSMOCHIMICA ACTA,71(17),4327-4341. |
| MLA | Tang, Yan-Jie,et al."Lithium isotopic systematics of peridotite xenoliths from Hannuoba, North China Craton: Implications for melt-rock interaction in the considerably thinned lithospheric mantle".GEOCHIMICA ET COSMOCHIMICA ACTA 71.17(2007):4327-4341. |
入库方式： OAI收割
来源：地质与地球物理研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。