Magma Source Evolution Following Subduction Initiation: Evidence From the Element Concentrations, Stable Isotope Ratios, and Water Contents of Volcanic Glasses From the Bonin Forearc (IODP Expedition 352)
Abstract International Ocean Discovery Program Expedition 352 to the Bonin forearc drilled the sequence of volcanic rocks erupted in the immediate aftermath of subduction initiation along the western margin of the Pacific Plate. Pristine volcanic glasses collected during this expedition were analyze...
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| Format: | Article |
| Language: | English |
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Wiley
2021-01-01
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| Series: | Geochemistry, Geophysics, Geosystems |
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| Online Access: | https://doi.org/10.1029/2020GC009054 |
| _version_ | 1827771698684887040 |
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| author | Daniel A. Coulthard Jr Mark K. Reagan Kenji Shimizu Ilya N. Bindeman Maryjo Brounce Renat R. Almeev Jeffrey Ryan Timothy Chapman John Shervais Julian A. Pearce |
| author_facet | Daniel A. Coulthard Jr Mark K. Reagan Kenji Shimizu Ilya N. Bindeman Maryjo Brounce Renat R. Almeev Jeffrey Ryan Timothy Chapman John Shervais Julian A. Pearce |
| author_sort | Daniel A. Coulthard Jr |
| collection | DOAJ |
| description | Abstract International Ocean Discovery Program Expedition 352 to the Bonin forearc drilled the sequence of volcanic rocks erupted in the immediate aftermath of subduction initiation along the western margin of the Pacific Plate. Pristine volcanic glasses collected during this expedition were analyzed for major and trace elements, halogens, sulfur, and H and O isotopes with goals of characterizing the fluids and melts of subducted materials that were involved in generating the nascent upper plate crust. Incompatible trace element compositions of the oldest lavas (forearc basalts [FAB]) are similar to those of the most depleted mid‐ocean ridge basalts globally. Most FAB were generated by decompression melting during seafloor spreading in a near‐trench, supra‐subduction zone environment with only minor involvement of diverse and generally dilute water‐rich fluids from the subducting plate. Boninite series glasses are enriched in incompatible trace elements mobilized from the subducting plate, but strongly depleted in other elements, such as the middle‐heavy rare‐earth elements. These traits are attributed to generation of boninites largely by flux melting involving water‐rich melts first derived from the leading edge of subducted basaltic crust and then from both subducted crust and sediment. These melts were generated at low pressures as the shallow, embryonic slab extracted heat from hot asthenosphere near the trench. The progressive depletion of the mantle source for the FAB‐through‐boninite sequence suggests that the asthenospheric mantle remained trapped above the nascent subducting plate for the first several million years of subduction beneath the Philippine Sea Plate. |
| first_indexed | 2024-03-11T12:58:54Z |
| format | Article |
| id | doaj.art-d1fbbbfbca9b4696ab50a8b142b1c19d |
| institution | Directory Open Access Journal |
| issn | 1525-2027 |
| language | English |
| last_indexed | 2024-03-11T12:58:54Z |
| publishDate | 2021-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | Geochemistry, Geophysics, Geosystems |
| spelling | doaj.art-d1fbbbfbca9b4696ab50a8b142b1c19d2023-11-03T16:55:56ZengWileyGeochemistry, Geophysics, Geosystems1525-20272021-01-01221n/an/a10.1029/2020GC009054Magma Source Evolution Following Subduction Initiation: Evidence From the Element Concentrations, Stable Isotope Ratios, and Water Contents of Volcanic Glasses From the Bonin Forearc (IODP Expedition 352)Daniel A. Coulthard Jr0Mark K. Reagan1Kenji Shimizu2Ilya N. Bindeman3Maryjo Brounce4Renat R. Almeev5Jeffrey Ryan6Timothy Chapman7John Shervais8Julian A. Pearce9Department of Earth and Environmental Sciences University of Iowa Iowa City IA USADepartment of Earth and Environmental Sciences University of Iowa Iowa City IA USAKochi Institute for Core Sample Research Japan Agency for Marine‐Earth Science and Technology Nankoku Kochi JapanDepartment of Earth Sciences University of Oregon Eugene OR USADepartment of Earth Science University of California Riverside Riverside CA USAInstitüt Für Mineralogie Leibniz Universität Hannover Hannover GermanySchool of Geosciences University of South Florida Tampa FL USASchool of Environmental and Rural Science University of New England Armidale NSW AustraliaDepartment of Geology Utah State University Logan UT USASchool of Earth & Ocean Sciences Cardiff University Cardiff UKAbstract International Ocean Discovery Program Expedition 352 to the Bonin forearc drilled the sequence of volcanic rocks erupted in the immediate aftermath of subduction initiation along the western margin of the Pacific Plate. Pristine volcanic glasses collected during this expedition were analyzed for major and trace elements, halogens, sulfur, and H and O isotopes with goals of characterizing the fluids and melts of subducted materials that were involved in generating the nascent upper plate crust. Incompatible trace element compositions of the oldest lavas (forearc basalts [FAB]) are similar to those of the most depleted mid‐ocean ridge basalts globally. Most FAB were generated by decompression melting during seafloor spreading in a near‐trench, supra‐subduction zone environment with only minor involvement of diverse and generally dilute water‐rich fluids from the subducting plate. Boninite series glasses are enriched in incompatible trace elements mobilized from the subducting plate, but strongly depleted in other elements, such as the middle‐heavy rare‐earth elements. These traits are attributed to generation of boninites largely by flux melting involving water‐rich melts first derived from the leading edge of subducted basaltic crust and then from both subducted crust and sediment. These melts were generated at low pressures as the shallow, embryonic slab extracted heat from hot asthenosphere near the trench. The progressive depletion of the mantle source for the FAB‐through‐boninite sequence suggests that the asthenospheric mantle remained trapped above the nascent subducting plate for the first several million years of subduction beneath the Philippine Sea Plate.https://doi.org/10.1029/2020GC009054boninitesforearc basaltsIODP Expedition 352Izu‐Bonin‐MarianaJOIDES ResolutionSite U1439 |
| spellingShingle | Daniel A. Coulthard Jr Mark K. Reagan Kenji Shimizu Ilya N. Bindeman Maryjo Brounce Renat R. Almeev Jeffrey Ryan Timothy Chapman John Shervais Julian A. Pearce Magma Source Evolution Following Subduction Initiation: Evidence From the Element Concentrations, Stable Isotope Ratios, and Water Contents of Volcanic Glasses From the Bonin Forearc (IODP Expedition 352) Geochemistry, Geophysics, Geosystems boninites forearc basalts IODP Expedition 352 Izu‐Bonin‐Mariana JOIDES Resolution Site U1439 |
| title | Magma Source Evolution Following Subduction Initiation: Evidence From the Element Concentrations, Stable Isotope Ratios, and Water Contents of Volcanic Glasses From the Bonin Forearc (IODP Expedition 352) |
| title_full | Magma Source Evolution Following Subduction Initiation: Evidence From the Element Concentrations, Stable Isotope Ratios, and Water Contents of Volcanic Glasses From the Bonin Forearc (IODP Expedition 352) |
| title_fullStr | Magma Source Evolution Following Subduction Initiation: Evidence From the Element Concentrations, Stable Isotope Ratios, and Water Contents of Volcanic Glasses From the Bonin Forearc (IODP Expedition 352) |
| title_full_unstemmed | Magma Source Evolution Following Subduction Initiation: Evidence From the Element Concentrations, Stable Isotope Ratios, and Water Contents of Volcanic Glasses From the Bonin Forearc (IODP Expedition 352) |
| title_short | Magma Source Evolution Following Subduction Initiation: Evidence From the Element Concentrations, Stable Isotope Ratios, and Water Contents of Volcanic Glasses From the Bonin Forearc (IODP Expedition 352) |
| title_sort | magma source evolution following subduction initiation evidence from the element concentrations stable isotope ratios and water contents of volcanic glasses from the bonin forearc iodp expedition 352 |
| topic | boninites forearc basalts IODP Expedition 352 Izu‐Bonin‐Mariana JOIDES Resolution Site U1439 |
| url | https://doi.org/10.1029/2020GC009054 |
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