Coupled Geodynamical‐Geochemical Perspectives on the Generation and Composition of Mid‐Ocean Ridge Basalts
Abstract Owing to their abundance and relative availability on Earth's seafloor, mid‐ocean ridge basalts (MORBs) have a well‐defined chemical element budget, reflected by the low standard deviation associated with typical normal MORB (N‐MORB) composition. However, the exact mechanisms leading t...
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| Format: | Article |
| Language: | English |
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Wiley
2024-02-01
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| Series: | Geochemistry, Geophysics, Geosystems |
| Subjects: | |
| Online Access: | https://doi.org/10.1029/2023GC011288 |
| _version_ | 1797262515611107328 |
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| author | Thomas Duvernay Shihao Jiang Patrick W. Ball D. Rhodri Davies |
| author_facet | Thomas Duvernay Shihao Jiang Patrick W. Ball D. Rhodri Davies |
| author_sort | Thomas Duvernay |
| collection | DOAJ |
| description | Abstract Owing to their abundance and relative availability on Earth's seafloor, mid‐ocean ridge basalts (MORBs) have a well‐defined chemical element budget, reflected by the low standard deviation associated with typical normal MORB (N‐MORB) composition. However, the exact mechanisms leading to magma differentiation and MORB generation remain debated, which hinders our ability to evaluate MORB parental magma composition. In this study, we leverage the predictive power of the BDD21 numerical framework to obtain a representative trace element budget of parental MORB magma and assess its ability to fractionate into the N‐MORB composition. Utilizing revised parameterizations for mineralogy, melting, and partitioning, we couple BDD21 with numerical simulations of a MOR system driven by seafloor spreading in which we track the evolution of partial melting, mineral modal abundances, and concentrations of incompatible elements. Parental magma compositions are determined once simulations reach a steady state, and magma chamber replenishment models are employed to predict the trace element budget of the erupted liquid. We explore a range of geophysical and geochemical parameters to evaluate their effect on computed trace element concentrations. Previous magma chamber replenishment models are extended to account for multiple crystallization events and melt‐crystal interaction. Modeling outcomes suggest that petrologically constrained fractionation of parental magma compositions obtained through BDD21 yields glass compositions compatible with the N‐MORB budget. Nevertheless, our results show a systematic underestimation of Sr concentration, indicating the presence of recycled oceanic crust in the MORB source region. |
| first_indexed | 2024-03-07T21:33:39Z |
| format | Article |
| id | doaj.art-6fac2b00e15445acb0ec70254e1b3ecf |
| institution | Directory Open Access Journal |
| issn | 1525-2027 |
| language | English |
| last_indexed | 2024-04-24T23:58:20Z |
| publishDate | 2024-02-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geochemistry, Geophysics, Geosystems |
| spelling | doaj.art-6fac2b00e15445acb0ec70254e1b3ecf2024-03-14T10:55:31ZengWileyGeochemistry, Geophysics, Geosystems1525-20272024-02-01252n/an/a10.1029/2023GC011288Coupled Geodynamical‐Geochemical Perspectives on the Generation and Composition of Mid‐Ocean Ridge BasaltsThomas Duvernay0Shihao Jiang1Patrick W. Ball2D. Rhodri Davies3Research School of Earth Sciences Australian National University Canberra ACT AustraliaResearch School of Earth Sciences Australian National University Canberra ACT AustraliaResearch School of Earth Sciences Australian National University Canberra ACT AustraliaResearch School of Earth Sciences Australian National University Canberra ACT AustraliaAbstract Owing to their abundance and relative availability on Earth's seafloor, mid‐ocean ridge basalts (MORBs) have a well‐defined chemical element budget, reflected by the low standard deviation associated with typical normal MORB (N‐MORB) composition. However, the exact mechanisms leading to magma differentiation and MORB generation remain debated, which hinders our ability to evaluate MORB parental magma composition. In this study, we leverage the predictive power of the BDD21 numerical framework to obtain a representative trace element budget of parental MORB magma and assess its ability to fractionate into the N‐MORB composition. Utilizing revised parameterizations for mineralogy, melting, and partitioning, we couple BDD21 with numerical simulations of a MOR system driven by seafloor spreading in which we track the evolution of partial melting, mineral modal abundances, and concentrations of incompatible elements. Parental magma compositions are determined once simulations reach a steady state, and magma chamber replenishment models are employed to predict the trace element budget of the erupted liquid. We explore a range of geophysical and geochemical parameters to evaluate their effect on computed trace element concentrations. Previous magma chamber replenishment models are extended to account for multiple crystallization events and melt‐crystal interaction. Modeling outcomes suggest that petrologically constrained fractionation of parental magma compositions obtained through BDD21 yields glass compositions compatible with the N‐MORB budget. Nevertheless, our results show a systematic underestimation of Sr concentration, indicating the presence of recycled oceanic crust in the MORB source region.https://doi.org/10.1029/2023GC011288mid‐ocean ridgeN‐MORBmagma chambernumerical modelingperidotite meltingparameterizations |
| spellingShingle | Thomas Duvernay Shihao Jiang Patrick W. Ball D. Rhodri Davies Coupled Geodynamical‐Geochemical Perspectives on the Generation and Composition of Mid‐Ocean Ridge Basalts Geochemistry, Geophysics, Geosystems mid‐ocean ridge N‐MORB magma chamber numerical modeling peridotite melting parameterizations |
| title | Coupled Geodynamical‐Geochemical Perspectives on the Generation and Composition of Mid‐Ocean Ridge Basalts |
| title_full | Coupled Geodynamical‐Geochemical Perspectives on the Generation and Composition of Mid‐Ocean Ridge Basalts |
| title_fullStr | Coupled Geodynamical‐Geochemical Perspectives on the Generation and Composition of Mid‐Ocean Ridge Basalts |
| title_full_unstemmed | Coupled Geodynamical‐Geochemical Perspectives on the Generation and Composition of Mid‐Ocean Ridge Basalts |
| title_short | Coupled Geodynamical‐Geochemical Perspectives on the Generation and Composition of Mid‐Ocean Ridge Basalts |
| title_sort | coupled geodynamical geochemical perspectives on the generation and composition of mid ocean ridge basalts |
| topic | mid‐ocean ridge N‐MORB magma chamber numerical modeling peridotite melting parameterizations |
| url | https://doi.org/10.1029/2023GC011288 |
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