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
Widespread Cenozoic basalts, erupted at ca. 24β0.16 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 isotopi...
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| Format: | Journal Article |
| Language: | English |
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ELSEVIER SCIENCE BV
2019
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| Online Access: | http://purl.org/au-research/grants/arc/FT140100826 http://hdl.handle.net/20.500.11937/90967 |
| _version_ | 1848765474587803648 |
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| author | Pang, C.J. Wang, Xuan-Ce Li, C.F. Wilde, Simon Tian, L. |
| author_facet | Pang, C.J. Wang, Xuan-Ce Li, C.F. Wilde, Simon Tian, L. |
| author_sort | Pang, C.J. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | Widespread Cenozoic basalts, erupted at ca. 24β0.16 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. |
| first_indexed | 2025-11-14T11:35:50Z |
| format | Journal Article |
| id | curtin-20.500.11937-90967 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-14T11:35:50Z |
| publishDate | 2019 |
| publisher | ELSEVIER SCIENCE BV |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-909672023-05-01T07:47:54Z 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, C.J. Wang, Xuan-Ce Li, C.F. Wilde, Simon Tian, L. Science & Technology Physical Sciences Geochemistry & Geophysics Mineralogy Central Inner Mongolia Cenozoic intra-plate basalts Pyroxenite source Recycled oceanic crust Paleo-Pacific and Paleo-Asian oceanic subduction Eastern China LITHOSPHERIC MANTLE TRACE-ELEMENTS GEOCHEMICAL EVIDENCE CONTINENTAL BASALTS IGNEOUS PROVINCE ALKALINE BASALTS SOURCE LITHOLOGY RECYCLED CRUST FLOOD BASALTS SOURCE REGION Widespread Cenozoic basalts, erupted at ca. 24β0.16 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. 2019 Journal Article http://hdl.handle.net/20.500.11937/90967 10.1016/j.lithos.2019.02.012 English http://purl.org/au-research/grants/arc/FT140100826 http://creativecommons.org/licenses/by-nc-nd/4.0/ ELSEVIER SCIENCE BV fulltext |
| spellingShingle | Science & Technology Physical Sciences Geochemistry & Geophysics Mineralogy Central Inner Mongolia Cenozoic intra-plate basalts Pyroxenite source Recycled oceanic crust Paleo-Pacific and Paleo-Asian oceanic subduction Eastern China LITHOSPHERIC MANTLE TRACE-ELEMENTS GEOCHEMICAL EVIDENCE CONTINENTAL BASALTS IGNEOUS PROVINCE ALKALINE BASALTS SOURCE LITHOLOGY RECYCLED CRUST FLOOD BASALTS SOURCE REGION Pang, C.J. Wang, Xuan-Ce Li, C.F. Wilde, Simon Tian, L. 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 |
| title | 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 |
| title_full | 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 |
| title_fullStr | 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 |
| title_full_unstemmed | 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 |
| title_short | 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 |
| title_sort | 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 |
| topic | Science & Technology Physical Sciences Geochemistry & Geophysics Mineralogy Central Inner Mongolia Cenozoic intra-plate basalts Pyroxenite source Recycled oceanic crust Paleo-Pacific and Paleo-Asian oceanic subduction Eastern China LITHOSPHERIC MANTLE TRACE-ELEMENTS GEOCHEMICAL EVIDENCE CONTINENTAL BASALTS IGNEOUS PROVINCE ALKALINE BASALTS SOURCE LITHOLOGY RECYCLED CRUST FLOOD BASALTS SOURCE REGION |
| url | http://purl.org/au-research/grants/arc/FT140100826 http://hdl.handle.net/20.500.11937/90967 |