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A metasomatized O-18-rich veined lithospheric mantle source for ultrapotassic magmas

文献类型：期刊论文

作者Fan, Wenbo3; Jiang, Neng1,2; Hu, Jun1,2; Liu, Danqing1,2; Zhao, Lang1,2; Li, Tiejun1,2
刊名LITHOS
出版日期2021-02-01
卷号382页码:13
关键词Ultrapotassic magma O-18-rich metasomatism Veined mantle North China craton The Alpine-Himalayan orogenic belt
ISSN号0024-4937
DOI10.1016/j.lithos.2020.105964
英文摘要While ultrapotassic rocks are generally considered to be derived from a metasomatized mantle source, whether their characteristically high delta O-18 values represent a primary or a secondary feature and whether the mantle metasomatismis localized or pervasive remain unresolved questions. Here we report that the old, depleted lithospheric mantle in the northern North China craton was locally metasomatized during the late Paleozoic by agents derived from subducted sediments, resulting in incompatible-element-rich phlogopite-bearing pyroxenite veins with anomalously elevated delta O-18 (9.9-12.3 parts per thousand), high Sr-87/Sr-86 from 0.7091 to 0.7164, and extremely low epsilon(Nd) between -25.2 and - 18.2. Subsequent melting of the metasomatic veins plus depleted peridotite host produced the early Mesozoic ultrapotassic rocks with variably enriched isotopic compositions. The proposed scenario can be applied to the Alpine-Himalayan ultrapotassic rocks that are characterized by elevated delta O-18 values and highly evolved Sr-Nd isotopic compositions. It is argued that the metasomatized O-18-rich source can only be present as veins in the mantle peridotites. The extreme chemical and isotopic variations of the ultrapotassic rocks could reflect those of the metasomatic veins and/or variable proportions of vein material and the peridotite host involved during partial melting. Therefore, the isotopic compositions of mantle-derived rocks may not be directly utilized to infer the nature of the lithospheric mantle. A metasomatized veined mantle source may also be inferred for other types of mantle-derived rocks such as basalts, high-Mg andesites and the Archean sanukitoids. (C) 2020 Elsevier B.V. All rights reserved.
WOS关键词NORTH CHINA CRATON ; OXYGEN-ISOTOPE EVIDENCE ; SPINEL PERIDOTITE XENOLITHS ; HOLM-MUNKSGAARD OXYGEN ; EASTERN CHINA ; TRACE-ELEMENT ; OS ISOTOPES ; ULTRAMAFIC XENOLITHS ; VULSINIAN DISTRICT ; STRONTIUM ISOTOPE
资助项目National Natural Science Foundation of China[41973034]
WOS研究方向Geochemistry & Geophysics ; Mineralogy
语种英语
WOS记录号WOS:000652194600029
出版者ELSEVIER
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/132A11/101236]  
专题地质与地球物理研究所_岩石圈演化国家重点实验室
通讯作者Jiang, Neng
作者单位1.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing 100029, Peoples R China
3.Northwest Univ, State Key Lab Continental Dynam, Xian 710069, Peoples R China
推荐引用方式
GB/T 7714		 Fan, Wenbo,Jiang, Neng,Hu, Jun,et al. A metasomatized O-18-rich veined lithospheric mantle source for ultrapotassic magmas[J]. LITHOS,2021,382:13.
APA Fan, Wenbo,Jiang, Neng,Hu, Jun,Liu, Danqing,Zhao, Lang,&Li, Tiejun.(2021).A metasomatized O-18-rich veined lithospheric mantle source for ultrapotassic magmas.LITHOS,382,13.
MLA Fan, Wenbo,et al."A metasomatized O-18-rich veined lithospheric mantle source for ultrapotassic magmas".LITHOS 382(2021):13.

入库方式： OAI收割

来源：地质与地球物理研究所

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