Slab-derived halogens and noble gases illuminate closed system processes controlling volatile element transport into the mantle wedge
Halogen and noble gas systematics are powerful tracers of volatile recycling in subduction zones. We present halogen and noble gas compositions of mantle peridotites containing H2O-rich fluid inclusions collected at volcanic fronts from two contrasting subduction zones (the Avacha volcano of Kamchat...
| Main Authors: | , , , , , , , , , , |
|---|---|
| Format: | Journal article |
| Published: |
Elsevier
2016
|
| _version_ | 1826303801642975232 |
|---|---|
| author | Kobayashi, M Sumino, H Nagao, K Ishimaru, S Arai, S Yoshikawa, M Kawamoto, T Kumagai, Y Kobayashi, T Burgess, R Ballentine, C |
| author_facet | Kobayashi, M Sumino, H Nagao, K Ishimaru, S Arai, S Yoshikawa, M Kawamoto, T Kumagai, Y Kobayashi, T Burgess, R Ballentine, C |
| author_sort | Kobayashi, M |
| collection | OXFORD |
| description | Halogen and noble gas systematics are powerful tracers of volatile recycling in subduction zones. We present halogen and noble gas compositions of mantle peridotites containing H2O-rich fluid inclusions collected at volcanic fronts from two contrasting subduction zones (the Avacha volcano of Kamchatka arc and the Pinatubo volcano of Luzon arcs) and orogenic peridotites from a peridotite massif (the Horoman massif, Hokkaido, Japan) which represents an exhumed portion of the mantle wedge. The aims are to determine how volatiles are carried into the mantle wedge and how the subducted fluids modify halogen and noble gas compositions in the mantle. The halogen and noble gas signatures in the H2O-rich fluids are similar to those of marine sedimentary pore fluids and forearc and seafloor serpentinites. This suggests that marine pore fluids in deep-sea sediments are carried by serpentine and supplied to the mantle wedge, preserving their original halogen and noble gas compositions. We suggest that the sedimentary pore fluid-derived water is incorporated into serpentine through hydration in a closed system along faults at the outer rise of the oceanic, preserving Cl/H2O and 36Ar/H2O values of sedimentary pore fluids. Dehydration–hydration process within the oceanic lithospheric mantle maintains the closed system until the final stage of serpentine dehydration. The sedimentary pore fluid-like halogen and noble gas signatures in fluids released at the final stage of serpentine dehydration are preserved due to highly channelized flow, whereas the original Cl/H2O and 36Ar/H2O ratios are fractionated by the higher incompatibility of halogens and noble gases in hydrous minerals. |
| first_indexed | 2024-03-07T06:08:13Z |
| format | Journal article |
| id | oxford-uuid:ee9103af-5d0c-4f8f-8cf4-56597ff20bfc |
| institution | University of Oxford |
| last_indexed | 2024-03-07T06:08:13Z |
| publishDate | 2016 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | oxford-uuid:ee9103af-5d0c-4f8f-8cf4-56597ff20bfc2022-03-27T11:33:57ZSlab-derived halogens and noble gases illuminate closed system processes controlling volatile element transport into the mantle wedgeJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:ee9103af-5d0c-4f8f-8cf4-56597ff20bfcSymplectic Elements at OxfordElsevier2016Kobayashi, MSumino, HNagao, KIshimaru, SArai, SYoshikawa, MKawamoto, TKumagai, YKobayashi, TBurgess, RBallentine, CHalogen and noble gas systematics are powerful tracers of volatile recycling in subduction zones. We present halogen and noble gas compositions of mantle peridotites containing H2O-rich fluid inclusions collected at volcanic fronts from two contrasting subduction zones (the Avacha volcano of Kamchatka arc and the Pinatubo volcano of Luzon arcs) and orogenic peridotites from a peridotite massif (the Horoman massif, Hokkaido, Japan) which represents an exhumed portion of the mantle wedge. The aims are to determine how volatiles are carried into the mantle wedge and how the subducted fluids modify halogen and noble gas compositions in the mantle. The halogen and noble gas signatures in the H2O-rich fluids are similar to those of marine sedimentary pore fluids and forearc and seafloor serpentinites. This suggests that marine pore fluids in deep-sea sediments are carried by serpentine and supplied to the mantle wedge, preserving their original halogen and noble gas compositions. We suggest that the sedimentary pore fluid-derived water is incorporated into serpentine through hydration in a closed system along faults at the outer rise of the oceanic, preserving Cl/H2O and 36Ar/H2O values of sedimentary pore fluids. Dehydration–hydration process within the oceanic lithospheric mantle maintains the closed system until the final stage of serpentine dehydration. The sedimentary pore fluid-like halogen and noble gas signatures in fluids released at the final stage of serpentine dehydration are preserved due to highly channelized flow, whereas the original Cl/H2O and 36Ar/H2O ratios are fractionated by the higher incompatibility of halogens and noble gases in hydrous minerals. |
| spellingShingle | Kobayashi, M Sumino, H Nagao, K Ishimaru, S Arai, S Yoshikawa, M Kawamoto, T Kumagai, Y Kobayashi, T Burgess, R Ballentine, C Slab-derived halogens and noble gases illuminate closed system processes controlling volatile element transport into the mantle wedge |
| title | Slab-derived halogens and noble gases illuminate closed system processes controlling volatile element transport into the mantle wedge |
| title_full | Slab-derived halogens and noble gases illuminate closed system processes controlling volatile element transport into the mantle wedge |
| title_fullStr | Slab-derived halogens and noble gases illuminate closed system processes controlling volatile element transport into the mantle wedge |
| title_full_unstemmed | Slab-derived halogens and noble gases illuminate closed system processes controlling volatile element transport into the mantle wedge |
| title_short | Slab-derived halogens and noble gases illuminate closed system processes controlling volatile element transport into the mantle wedge |
| title_sort | slab derived halogens and noble gases illuminate closed system processes controlling volatile element transport into the mantle wedge |
| work_keys_str_mv | AT kobayashim slabderivedhalogensandnoblegasesilluminateclosedsystemprocessescontrollingvolatileelementtransportintothemantlewedge AT suminoh slabderivedhalogensandnoblegasesilluminateclosedsystemprocessescontrollingvolatileelementtransportintothemantlewedge AT nagaok slabderivedhalogensandnoblegasesilluminateclosedsystemprocessescontrollingvolatileelementtransportintothemantlewedge AT ishimarus slabderivedhalogensandnoblegasesilluminateclosedsystemprocessescontrollingvolatileelementtransportintothemantlewedge AT arais slabderivedhalogensandnoblegasesilluminateclosedsystemprocessescontrollingvolatileelementtransportintothemantlewedge AT yoshikawam slabderivedhalogensandnoblegasesilluminateclosedsystemprocessescontrollingvolatileelementtransportintothemantlewedge AT kawamotot slabderivedhalogensandnoblegasesilluminateclosedsystemprocessescontrollingvolatileelementtransportintothemantlewedge AT kumagaiy slabderivedhalogensandnoblegasesilluminateclosedsystemprocessescontrollingvolatileelementtransportintothemantlewedge AT kobayashit slabderivedhalogensandnoblegasesilluminateclosedsystemprocessescontrollingvolatileelementtransportintothemantlewedge AT burgessr slabderivedhalogensandnoblegasesilluminateclosedsystemprocessescontrollingvolatileelementtransportintothemantlewedge AT ballentinec slabderivedhalogensandnoblegasesilluminateclosedsystemprocessescontrollingvolatileelementtransportintothemantlewedge |