中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 海洋研究所
  3. 中国科学院海洋研究所
Origin of magmatic harzburgite as a result of boninite magma evolution - An illustration using layered harzburgite-dunite cumulate from the Troodos ophiolite complex

文献类型：期刊论文

作者Shen, Fangyu2,3,5,6; Niu, Yaoling2,4,5,6; Chen, Yanhong4,6; Gao, Yajie1; Wang, Xiaohong2,5; Duan, Meng2,5; Shan, Li2,3,5
刊名LITHOS
出版日期2020-12-01
卷号376页码:16
关键词Cumulate harzburgite Petrogenesis Boninite magma evolution Troodos ophiolite Fractional crystallization
ISSN号0024-4937
DOI10.1016/j.lithos.2020.105764
通讯作者Shen, Fangyu(fangyushen@qdio.ac.cn) ; Niu, Yaoling(yaoling.niu@durham.ac.uk)
英文摘要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.
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
语种英语
WOS记录号WOS:000580897000029
出版者ELSEVIER
源URL[http://ir.qdio.ac.cn/handle/337002/169150]  
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.Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 2601, Australia
2.Qingdao Natl Lab Marine Sci & Technol, Lab Marine Geol, Qingdao 266061, Peoples R China
3.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
4.China Univ Geosci, Sch Earth Sci & Resources, Beijing 100083, Peoples R China
5.Chinese Acad Sci, Inst Oceanol, Qingdao 266071, Peoples R China
6.Univ Durham, Dept Earth Sci, Durham DH1 3LE, England
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.

入库方式： OAI收割

来源：海洋研究所

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。