Pyroxenite-derived Cenozoic basaltic magmatism in central Inner Mongolia, eastern China: Potential contributions from the subduction of the Paleo-Pacific and Paleo-Asian oceanic slabs in the Mantle Transition Zone | |
Pang,Chong-Jin2; Wang,Xuan-Ce1,3,4; Li,Chao-Feng5; Wilde,Simon A.6; Tian,Liyan7,8 | |
刊名 | Lithos |
2019 | |
卷号 | 332 |
DOI | 10.1016/j.lithos.2019.02.012 |
英文摘要 | Widespread Cenozoic basalts, erupted at ca. 24–0.16 Ma in central Inner Mongolia, eastern China, are significant for understanding the potential links between deep subduction of oceanic slabs and the genesis of continental intra-plate magmatism. Here we examine the whole-rock geochemical and isotopic data, as well as olivine compositions, for Cenozoic alkali and tholeiitic basalts from the Abaga, Huitengliang, and Chifeng areas in central Inner Mongolia. The results suggest that fractional crystallization of olivine + clinopyroxene (in the alkali basalts) and olivine (in the tholeiites), played a key role in their magmatic evolution, without significant crustal contamination or post-magmatic alteration. Geochemical and petrogenetic analyses show that pyroxene and garnet were dominant phases in the residual mineral assemblage for both alkali basalts and tholeiites, implying a pyroxenite source for these basalts. We propose that a pyroxenite-dominated source may be the product of reaction between recycled oceanic slab-derived melts and surrounding mantle peridotites. The spatial and geochemical variations of the Cenozoic basalts in central Inner Mongolia, together with recent geophysical and geological observations in eastern China, imply that the origin and evolution of large-scale Cenozoic continental intra-plate magmatism can be related to subduction of the Paleo-Pacific and Paleo-Asian oceanic slabs. Incorporation of recycled oceanic materials from these two subducted slabs thus influenced the mantle source lithologies and deep-Earth geodynamic processes beneath eastern China. |
语种 | 英语 |
内容类型 | 期刊论文 |
版本 | 出版稿 |
源URL | [http://ir.idsse.ac.cn/handle/183446/7909] |
专题 | 深海科学研究部_深海地质与地球化学研究室 |
通讯作者 | Wang,Xuan-Ce |
作者单位 | 1.School of Earth and Environment Sciences, University of Queensland 2.Guangxi Key Laboratory of Hidden Metallic Ore Deposits Exploration, Guilin University of Technology 3.Yunnan Key Laboratory of Earth System Science, Yunnan University 4.The School of Earth Sciences, Chang'an University 5.Institute of Geology and Geophysics, Chinese Academy of Sciences 6.School of Earth and Planetary Sciences, Curtin University 7.Institute of Deep-sea Science and Engineering, Chinese Academy of Sciences 8.Qingdao National Laboratory for Marine Science and Technology |
推荐引用方式 GB/T 7714 | Pang,Chong-Jin,Wang,Xuan-Ce,Li,Chao-Feng,et al. Pyroxenite-derived Cenozoic basaltic magmatism in central Inner Mongolia, eastern China: Potential contributions from the subduction of the Paleo-Pacific and Paleo-Asian oceanic slabs in the Mantle Transition Zone[J]. Lithos,2019,332. |
APA | Pang,Chong-Jin,Wang,Xuan-Ce,Li,Chao-Feng,Wilde,Simon A.,&Tian,Liyan.(2019).Pyroxenite-derived Cenozoic basaltic magmatism in central Inner Mongolia, eastern China: Potential contributions from the subduction of the Paleo-Pacific and Paleo-Asian oceanic slabs in the Mantle Transition Zone.Lithos,332. |
MLA | Pang,Chong-Jin,et al."Pyroxenite-derived Cenozoic basaltic magmatism in central Inner Mongolia, eastern China: Potential contributions from the subduction of the Paleo-Pacific and Paleo-Asian oceanic slabs in the Mantle Transition Zone".Lithos 332(2019). |
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