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Origin of magmatic harzburgite as a result of boninite magma evolution - An illustration using layered harzburgite-dunite cumulate from the Troodos ophiolite complex | |
Shen, Fangyu1,2,3,4; Niu, Yaoling1,2,3,5; Chen, Yanhong2,5; Gao, Yajie6; Wang, Xiaohong1,3; Duan, Meng1,3; Shan, Li1,3,4 | |
2020-12-01 | |
发表期刊 | LITHOS |
ISSN | 0024-4937 |
卷号 | 376页码:16 |
通讯作者 | Shen, Fangyu(fangyushen@qdio.ac.cn) ; Niu, Yaoling(yaoling.niu@durham.ac.uk) |
摘要 | Olivine (Ol) and orthopyroxene (Opx) are the primary liquidus phases of boninite inmodern subduction settings and in many ophiolite complexes. It is thus straightforward to expect the formation of harzburgite cumulate resulting from boninite magma evolution. However, such magmatic harzburgite has been rarely studied. Here, we report the results of our study on such harzburgite from the Troodos ophiolite complex. The Troodos cumulate harzburgite (locally lherzolite) is characteristically interlayered with dunite, showing varying thickness onmillimeter to decimeter scales, as the result of volumetrically varyingmultiple pulses of melt injection into the evolvingmagma chamber. We illustrate the development of the interlayered cumulate by phase equilibrium analysis. The parental melt of each pulse begins to crystallize olivine to form a dunite layer before reaching the Ol-Opx cotectic, along which Ol and Opx coprecipitate to form a harzburgite layer. Periodical replenishment will result in dunite-harzburgite interlayered cumulate. In cases when replenishment may be delayed, the melt along the Ol-Opx cotectic can evolve to the Ol-Opx-clinopyroxene (Cpx) eutectic to form harzburgite with some Cpx or lherzolite. The calculated melts in equilibrium with spinels in the cumulate are characteristic of boninite in major element compositional spaces. The calculated melts in equilibrium with Cpx and Opx in the cumulate share the same as, or identical to, trace element patterns of the Troodos boninite (both glasses and bulk-rock compositions). Petrological modeling of the boninite magma evolution shows a crystallization order of Ol, Opx, Cpx, plagioclase. Our study also emphasizes the importance in considering dunite-harzburgite/lherzolite cumulatewhen interpreting seismic structure of the crust in subduction settings, especially in rock sequences associated with subduction initiation thought to be indicated by boninite magmatism. (C) 2020 Elsevier B.V. All rights reserved. |
关键词 | Cumulate harzburgite Petrogenesis Boninite magma evolution Troodos ophiolite Fractional crystallization |
DOI | 10.1016/j.lithos.2020.105764 |
收录类别 | SCI |
语种 | 英语 |
资助项目 | National Natural Science Foundation of China[91958215] ; National Natural Science Foundation of China[41630968] ; NSFC-Shandong Joint Fund for Marine Science Research Centers[U1606401] ; Qingdao National Laboratory for Marine Science and Technology[2015ASKJ03] ; 111 Project[B18048] |
WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
WOS类目 | Geochemistry & Geophysics ; Mineralogy |
WOS记录号 | WOS:000580897000029 |
出版者 | ELSEVIER |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://ir.qdio.ac.cn/handle/337002/169151 |
专题 | 中国科学院海洋研究所 |
通讯作者 | Shen, Fangyu; Niu, Yaoling |
作者单位 | 1.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China 2.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England 3.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China 4.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 5.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China 6.Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 2601, Australia |
第一作者单位 | 中国科学院海洋研究所 |
通讯作者单位 | 中国科学院海洋研究所 |
推荐引用方式 GB/T 7714 | Shen, Fangyu,Niu, Yaoling,Chen, Yanhong,et al. Origin of magmatic harzburgite as a result of boninite magma evolution - An illustration using layered harzburgite-dunite cumulate from the Troodos ophiolite complex[J]. LITHOS,2020,376:16. |
APA | Shen, Fangyu.,Niu, Yaoling.,Chen, Yanhong.,Gao, Yajie.,Wang, Xiaohong.,...&Shan, Li.(2020).Origin of magmatic harzburgite as a result of boninite magma evolution - An illustration using layered harzburgite-dunite cumulate from the Troodos ophiolite complex.LITHOS,376,16. |
MLA | Shen, Fangyu,et al."Origin of magmatic harzburgite as a result of boninite magma evolution - An illustration using layered harzburgite-dunite cumulate from the Troodos ophiolite complex".LITHOS 376(2020):16. |
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