Crustal SiO2 Content of the Emeishan Large Igneous Province and its Implications for Magma Volume and Plumbing System
Abstract The Permian Emeishan large igneous province (LIP) in Southwestern China is recognized as a remnant of mantle plume activity. Its crust composition has a significant bearing on understanding the magmatic plumbing system in a LIP and the volume of magmas generated, which is critical to the vi...
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| Format: | Article |
| Language: | English |
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Wiley
2021-08-01
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| Series: | Geochemistry, Geophysics, Geosystems |
| Subjects: | |
| Online Access: | https://doi.org/10.1029/2021GC009783 |
| _version_ | 1827771589411733504 |
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| author | Wei Li Yun Chen Yi‐Gang Xu |
| author_facet | Wei Li Yun Chen Yi‐Gang Xu |
| author_sort | Wei Li |
| collection | DOAJ |
| description | Abstract The Permian Emeishan large igneous province (LIP) in Southwestern China is recognized as a remnant of mantle plume activity. Its crust composition has a significant bearing on understanding the magmatic plumbing system in a LIP and the volume of magmas generated, which is critical to the viability of the mantle plume model and its potential environmental impact but is difficult to constrain. Here, a SiO2‐VP/VS‐VS relationship, compiled from existing laboratory measurements, is used to estimate the crustal SiO2 content of the Emeishan LIP based on the joint constraint of the crustal bulk VP/VS ratio and average VS. The crust underneath the northeastern inner zone of the Emeishan LIP has a SiO2 content of ∼55.7 wt%, in contrast with the bulk continental crust's SiO2 content of 62.1 ± 2.1 wt% but largely overlapping with the exposed mafic‐ultramafic intrusions. Such an unusually “mafic” crust is attributable to the intensive magmatic underplating and intraplating associated with the Emeishan mantle plume. It further allows a minimum estimate of the volume of ∼1.45 × 106 km3 for erupted magmas and ∼2.39 × 106 km3 for total emplaced magmas, which is comparable to the volume of typical plume‐generated LIPs. |
| first_indexed | 2024-03-11T12:56:23Z |
| format | Article |
| id | doaj.art-5310204bc03e4b4d8446b96bf5700c2a |
| institution | Directory Open Access Journal |
| issn | 1525-2027 |
| language | English |
| last_indexed | 2024-03-11T12:56:23Z |
| publishDate | 2021-08-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geochemistry, Geophysics, Geosystems |
| spelling | doaj.art-5310204bc03e4b4d8446b96bf5700c2a2023-11-03T17:00:37ZengWileyGeochemistry, Geophysics, Geosystems1525-20272021-08-01228n/an/a10.1029/2021GC009783Crustal SiO2 Content of the Emeishan Large Igneous Province and its Implications for Magma Volume and Plumbing SystemWei Li0Yun Chen1Yi‐Gang Xu2State Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Beijing ChinaState Key Laboratory of Lithospheric Evolution Institute of Geology and Geophysics Chinese Academy of Sciences Beijing ChinaCAS Center for Excellence in Deep Earth Science Guangzhou ChinaAbstract The Permian Emeishan large igneous province (LIP) in Southwestern China is recognized as a remnant of mantle plume activity. Its crust composition has a significant bearing on understanding the magmatic plumbing system in a LIP and the volume of magmas generated, which is critical to the viability of the mantle plume model and its potential environmental impact but is difficult to constrain. Here, a SiO2‐VP/VS‐VS relationship, compiled from existing laboratory measurements, is used to estimate the crustal SiO2 content of the Emeishan LIP based on the joint constraint of the crustal bulk VP/VS ratio and average VS. The crust underneath the northeastern inner zone of the Emeishan LIP has a SiO2 content of ∼55.7 wt%, in contrast with the bulk continental crust's SiO2 content of 62.1 ± 2.1 wt% but largely overlapping with the exposed mafic‐ultramafic intrusions. Such an unusually “mafic” crust is attributable to the intensive magmatic underplating and intraplating associated with the Emeishan mantle plume. It further allows a minimum estimate of the volume of ∼1.45 × 106 km3 for erupted magmas and ∼2.39 × 106 km3 for total emplaced magmas, which is comparable to the volume of typical plume‐generated LIPs.https://doi.org/10.1029/2021GC009783crust compositionEmeishan large igneous provincemagma plumbing systemreceiver functionSiO2‐VP/VS‐VS relationshipmagma volume |
| spellingShingle | Wei Li Yun Chen Yi‐Gang Xu Crustal SiO2 Content of the Emeishan Large Igneous Province and its Implications for Magma Volume and Plumbing System Geochemistry, Geophysics, Geosystems crust composition Emeishan large igneous province magma plumbing system receiver function SiO2‐VP/VS‐VS relationship magma volume |
| title | Crustal SiO2 Content of the Emeishan Large Igneous Province and its Implications for Magma Volume and Plumbing System |
| title_full | Crustal SiO2 Content of the Emeishan Large Igneous Province and its Implications for Magma Volume and Plumbing System |
| title_fullStr | Crustal SiO2 Content of the Emeishan Large Igneous Province and its Implications for Magma Volume and Plumbing System |
| title_full_unstemmed | Crustal SiO2 Content of the Emeishan Large Igneous Province and its Implications for Magma Volume and Plumbing System |
| title_short | Crustal SiO2 Content of the Emeishan Large Igneous Province and its Implications for Magma Volume and Plumbing System |
| title_sort | crustal sio2 content of the emeishan large igneous province and its implications for magma volume and plumbing system |
| topic | crust composition Emeishan large igneous province magma plumbing system receiver function SiO2‐VP/VS‐VS relationship magma volume |
| url | https://doi.org/10.1029/2021GC009783 |
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