Proterozoic mantle melting recorded by the Re-Os isotopic systematics of ophiolites from the Qilian Orogenic Belt, northwestern China
文献类型：期刊论文
| 作者 | Zhao, Jing; Xiao, Qianru; Gao, Yilin; Zuo, Rui; Huang, Luyu; Li, Jie ; Long, Xiaoping
|
| 刊名 | JOURNAL OF ASIAN EARTH SCIENCES
 |
| 出版日期 | 2023 |
| 卷号 | 241页码:105479 |
| 关键词 | ZIRCON U-PB NW CHINA ACCRETIONARY BELT TIBETAN PLATEAU SUBDUCTION INITIATION ABYSSAL PERIDOTITES ULTRAMAFIC ROCKS INTRUSIVE ROCKS NORTHERN MARGIN VOLCANIC-ROCKS |
| ISSN号 | 1367-9120 |
| DOI | 10.1016/j.jseaes.2022.105479 |
| 英文摘要 | Re-Os isotopes of the mantle-derived ultramafic rocks can provide temporal constraints on the melt extraction of ancient mantle. Here, new geochemistry and Re-Os isotopes of serpentinites from the Minhe ophiolite in the Qilian Orogenic Belt (QOB) are presented. Their geochemical compositions (e.g., abundances of heavy rare earth elements, Al2O3, Yb, Re, and Th/Yb ratio) suggest that protoliths of the serpentinites originated as mantle res-idues. They underwent multiple episodes of melt depletion, leading to a highly refractory nature and high de-grees of partial melting (>18%). Moreover, subchondritic 187Re/188Os (0.0023-0.0399) and 187Os/188Os (0.1135-0.1210) ratios of the serpentinites, and decoupling of the Re-Os systematics and metasomatic proxies (e. g., LOI, Sr, La, and Th/Yb), demonstrate that fluid/melt metasomatism exerted a limited impact on their Re-Os isotopic systematics. Their Re-depletion ages (TRD), varying from 1.22 to 2.21 Ga, are analogues to their Re-Os model ages (TMA, 1.29-2.31 Ga). Therefore, Re-Os isotopic ages recorded by ophiolites in QOB indicate that at least two major melt-extraction episodes occurred in the lithospheric mantle during Proterozoic (1.2-1.6 Ga and 2.0-2.2 Ga). Notably, the 1.2-1.6 Ga mantle melt-depletion event may have a genetic affinity with the 1.1-1.7 Ga crustal growth. Mantle rocks from an ophiolite have a great potential in tracking ancient geological events, such as Precambrian mantle melting. |
| WOS研究方向 | Geosciences, Multidisciplinary |
| 语种 | 英语 |
| WOS记录号 | WOS:000927574000004 |
| 源URL | [http://ir.gig.ac.cn/handle/344008/80387]  |
| 专题 | 同位素地球化学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | Zhao, Jing,Xiao, Qianru,Gao, Yilin,et al. Proterozoic mantle melting recorded by the Re-Os isotopic systematics of ophiolites from the Qilian Orogenic Belt, northwestern China[J]. JOURNAL OF ASIAN EARTH SCIENCES,2023,241:105479. |
| APA | Zhao, Jing.,Xiao, Qianru.,Gao, Yilin.,Zuo, Rui.,Huang, Luyu.,...&Long, Xiaoping.(2023).Proterozoic mantle melting recorded by the Re-Os isotopic systematics of ophiolites from the Qilian Orogenic Belt, northwestern China.JOURNAL OF ASIAN EARTH SCIENCES,241,105479. |
| MLA | Zhao, Jing,et al."Proterozoic mantle melting recorded by the Re-Os isotopic systematics of ophiolites from the Qilian Orogenic Belt, northwestern China".JOURNAL OF ASIAN EARTH SCIENCES 241(2023):105479. |
入库方式： OAI收割
来源：广州地球化学研究所
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