Mantle melting models of the Kizildag ophiolite in SE Turkey: Two types of partial melting processes in the oceanic upper mantle of southern Neo-Tethys
文献类型：期刊论文
| 作者 | Chen, Chen1,5; Su, Ben-Xun1,2; Wang, Christina Yan5; Uysal, Ibrahim4; Yao, Zhuo-Sen3 |
| 刊名 | LITHOS
 |
| 出版日期 | 2021-10-01 |
| 卷号 | 398页码:17 |
| ISSN号 | 0024-4937 |
| 关键词 | Forearc basalt Boninitic melt Polybaric continuous melting Flux-melting |
| DOI | 10.1016/j.lithos.2021.106348 |
| 英文摘要 | Many ophiolites in southern Neo-Tethys contain complete lithologic sequences, with the dikes and lavas commonly having highly variable geochemical compositions. In this study, we examine the sheeted dikes and layered and isotropic gabbros of the Kizildag ophiolite (southern Turkey) and suggest that the compositional variations of the rocks are likely related to melting models of the mantle. The sheeted dikes and gabbros of the ophiolite have 206Pb/204Pb(90 Ma) of 17.765-19.361, 207Pb/204Pb(90 Ma) of 15.570-15.665 and 208Pb/204Pb(90 Ma) of 37.812-39.269, straddling the fields of Indian Ocean MORB and modern marine sediments. The sheeted dikes have low rare earth element (REE) concentrations and LaN/YbN ratios (e.g., Yb < 2.5 ppm and LaN/YbN of 0.33 to 0.62 on average), comparable with those of forearc basalt (FAB), except for a few samples whose trace element concentrations and patterns are similar to those of boninite. All the studied samples have positive anomalies of large ion lithophile elements (LILE) (e.g., Rb, Ba, Th, U and Sr) on a N-MORB-normalized trace element diagram and show considerable scatter on the plot of Th/Yb vs. Nb/Yb, which is attributed to involvement of slab-derived melts/fluids in a protoarc-forearc setting. Thermodynamic modelling results suggest that the parental magmas of the sheeted dikes were combined melts derived by both polybaric continuous melting (<10%) and flux-melting (<25%) of the mantle wedge during subduction initiation. In contrast, clinopyroxene and plagioclase in the layered and isotropic gabbros have compositions similar to those of boninite. The gabbro compositions can be simulated by batch crystallization of the boninitic melts, and the relatively high trace element concentrations of some isotropic gabbros likely reflect a high fraction of interstitial liquid in the crystal mush. Thus, we propose that the compositional variations of the sheeted dikes reflect two types of mantle melting, and that the gabbros were produced by subsequent crystallization within a crystal mush having variable fractions of interstitial liquid. Not only can such complex magmatic processes explain the observed compositional variations of dikes and lavas of the Kizildag ophiolite, but may be appliable to other ophiolites in southern Neo-Tethys, such as the Lycian, Pozanti-Karsanti and Troodos massifs. |
| WOS关键词 | TRACE-ELEMENT COMPOSITION ; POZANTI-KARSANTI OPHIOLITE ; TROODOS OPHIOLITE ; SUBDUCTION INITIATION ; MINERAL CHEMISTRY ; ADIABATIC DECOMPRESSION ; MERSIN OPHIOLITE ; HATAY OPHIOLITE ; OMAN OPHIOLITE ; MAFIC DYKES |
| 资助项目 | National Natural Science Foundation of China[91755205] ; National Natural Science Foundation of China[41772055] ; National Natural Science Foundation of China[91962217] |
| WOS研究方向 | Geochemistry & Geophysics ; Mineralogy |
| 语种 | 英语 |
| 出版者 | ELSEVIER |
| WOS记录号 | WOS:000687295200003 |
| 资助机构 | National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China |
| 源URL | [http://ir.iggcas.ac.cn/handle/132A11/101891]  |
| 专题 | 地质与地球物理研究所_中国科学院矿产资源研究重点实验室 |
| 通讯作者 | Chen, Chen |
| 作者单位 | 1.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Carleton Univ, Dept Earth Sci, Ottawa, ON K1S 5B6, Canada 4.Karadeniz Tech Univ, Dept Geol Engn, TR-61080 Trabzon, Turkey 5.Chinese Acad Sci, Guangzhou Inst Geochem, Key Lab Mineral & Metallogeny, Guangzhou 510460, Peoples R China |
| 推荐引用方式 GB/T 7714 | Chen, Chen,Su, Ben-Xun,Wang, Christina Yan,et al. Mantle melting models of the Kizildag ophiolite in SE Turkey: Two types of partial melting processes in the oceanic upper mantle of southern Neo-Tethys[J]. LITHOS,2021,398:17. |
| APA | Chen, Chen,Su, Ben-Xun,Wang, Christina Yan,Uysal, Ibrahim,&Yao, Zhuo-Sen.(2021).Mantle melting models of the Kizildag ophiolite in SE Turkey: Two types of partial melting processes in the oceanic upper mantle of southern Neo-Tethys.LITHOS,398,17. |
| MLA | Chen, Chen,et al."Mantle melting models of the Kizildag ophiolite in SE Turkey: Two types of partial melting processes in the oceanic upper mantle of southern Neo-Tethys".LITHOS 398(2021):17. |
入库方式： OAI收割
来源：地质与地球物理研究所
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