Deciphering Contribution of Recycled Altered Oceanic Crust to Arc Magmas Using Ba‐Sr‐Nd Isotopes
Altered oceanic crust (AOC) plays a critical role in geochemical recycling in subduction zones. However, identifying contributions of subducted AOC to arc magmas remains a conundrum due to the lack of effective tracers. Here, we investigate the Ba‐Sr‐Nd isotopic compositions of lavas from the Marian...
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| Veröffentlicht in: | Journal of geophysical research. Solid earth 2024-03, Vol.129 (3), p.n/a |
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| creator | Zhang, Yuxiang Shu, Yunchao Turner, Simon Chen, Zuxing Zeng, Zhigang Huang, Fang |
| description | Altered oceanic crust (AOC) plays a critical role in geochemical recycling in subduction zones. However, identifying contributions of subducted AOC to arc magmas remains a conundrum due to the lack of effective tracers. Here, we investigate the Ba‐Sr‐Nd isotopic compositions of lavas from the Mariana arc and back‐arc. Based on a statistical analysis of the Sr‐Nd isotopes for global arc volcanoes, we confirm that AOC‐derived fluid (or hydrous melt), rather than sediment‐derived melt or fluid, is responsible for the Sr‐Nd isotope decoupling (i.e., 87Sr/86Sr is “excessively” enriched relative to 143Nd/144Nd when compared to the “normal” mantle derivates) observed in island arc lavas. We show that the arc lavas with increasingly decoupled Sr‐Nd isotopes generally have heavier Ba isotope ratios, which is also a characteristic feature of AOC‐derived fluids. Thus, these results establish an intimate link between subducted AOC, heavy Ba isotope compositions, and Sr‐Nd isotope decoupling signature in island arcs, which provides a powerful tool to trace the AOC recycling in subduction zones. Furthermore, a similar correlation is observed between Sr‐Nd isotope decoupling and heavy B isotope ratios for global arc lavas, implying that the recycling of AOC component is generally linked to serpentinite dehydration in subduction zones.
Plain Language Summary
Altered oceanic crust (AOC) is an important subduction component that contributes to the generation of arc magmas. However, identifying this contribution to arc magmas is challenging for the lack of effective tracers. Nonetheless, AOC has two characteristic features: (a) Sr‐Nd isotope decoupling (i.e., enriched in 87Sr/86Sr relative to 143Nd/144Nd in contrast to the “normal” mantle array); and (b) relatively heavy Ba isotope compositions. Here, we analyze the Ba‐Sr‐Nd isotopic compositions of lavas from the Mariana arc and back‐arc, which are combined with a statistical analysis of the Sr‐Nd isotopes for global arc volcanoes. Our results confirm that fluid (or hydrous melt) derived from subducted AOC, rather than sediment, is responsible for the Sr‐Nd isotope decoupling observed in island arc lavas. Strikingly, the magnitude of the Sr‐Nd isotope decoupling correlates well with the Ba isotope compositions of the arc lavas. Thus, our results establish an intimate link between subducted AOC, heavy Ba isotope ratios, and Sr‐Nd isotope decoupling signature in island arcs. This combination of Ba‐Sr‐Nd isotopes can therefore |
| doi_str_mv | 10.1029/2023JB028407 |
| format | Article |
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Plain Language Summary
Altered oceanic crust (AOC) is an important subduction component that contributes to the generation of arc magmas. However, identifying this contribution to arc magmas is challenging for the lack of effective tracers. Nonetheless, AOC has two characteristic features: (a) Sr‐Nd isotope decoupling (i.e., enriched in 87Sr/86Sr relative to 143Nd/144Nd in contrast to the “normal” mantle array); and (b) relatively heavy Ba isotope compositions. Here, we analyze the Ba‐Sr‐Nd isotopic compositions of lavas from the Mariana arc and back‐arc, which are combined with a statistical analysis of the Sr‐Nd isotopes for global arc volcanoes. Our results confirm that fluid (or hydrous melt) derived from subducted AOC, rather than sediment, is responsible for the Sr‐Nd isotope decoupling observed in island arc lavas. Strikingly, the magnitude of the Sr‐Nd isotope decoupling correlates well with the Ba isotope compositions of the arc lavas. Thus, our results establish an intimate link between subducted AOC, heavy Ba isotope ratios, and Sr‐Nd isotope decoupling signature in island arcs. This combination of Ba‐Sr‐Nd isotopes can therefore now be used as a powerful tracer to identify the contributions of subducted AOC to arc magmas. Our results also suggest that AOC and serpentinite show synergistic behavior during subduction recycling.
Key Points
Global arc data confirm that the Sr‐Nd isotope decoupling of arc lavas is caused by AOC‐derived fluid
Decoupled Sr‐Nd isotopes plus heavy Ba isotope is a good tracer for recycled altered oceanic crust (AOC) in arc magmas
AOC and serpentinite show synergistic behaviors during subduction recycling</description><identifier>ISSN: 2169-9313</identifier><identifier>EISSN: 2169-9356</identifier><identifier>DOI: 10.1029/2023JB028407</identifier><language>eng</language><publisher>Washington: Blackwell Publishing Ltd</publisher><subject>altered oceanic crust ; arc magma ; Ba isotope ; Barium isotopes ; Composition ; Decoupling ; Dehydration ; Fluids ; Island arcs ; Isotope composition ; Isotope ratios ; Isotopes ; Neodymium isotopes ; Oceanic crust ; Recycling ; Sediment ; Serpentinite ; Sr‐Nd isotope decoupling ; Statistical analysis ; Statistical methods ; Statistics ; Strontium ; Strontium 87 ; Strontium isotopes ; Subduction ; Subduction (geology) ; subduction recycling ; Subduction zones ; Tracers ; Volcanoes</subject><ispartof>Journal of geophysical research. Solid earth, 2024-03, Vol.129 (3), p.n/a</ispartof><rights>2024. American Geophysical Union. All Rights Reserved.</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a3301-c7b438b4962d963e78f93225e4367c0966250a4dfcab6973262496718428085f3</citedby><cites>FETCH-LOGICAL-a3301-c7b438b4962d963e78f93225e4367c0966250a4dfcab6973262496718428085f3</cites><orcidid>0000-0002-7495-3053 ; 0000-0003-1437-8728 ; 0000-0003-1885-3311</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://onlinelibrary.wiley.com/doi/pdf/10.1029%2F2023JB028407$$EPDF$$P50$$Gwiley$$H</linktopdf><linktohtml>$$Uhttps://onlinelibrary.wiley.com/doi/full/10.1029%2F2023JB028407$$EHTML$$P50$$Gwiley$$H</linktohtml><link.rule.ids>314,777,781,1412,27905,27906,45555,45556</link.rule.ids></links><search><creatorcontrib>Zhang, Yuxiang</creatorcontrib><creatorcontrib>Shu, Yunchao</creatorcontrib><creatorcontrib>Turner, Simon</creatorcontrib><creatorcontrib>Chen, Zuxing</creatorcontrib><creatorcontrib>Zeng, Zhigang</creatorcontrib><creatorcontrib>Huang, Fang</creatorcontrib><title>Deciphering Contribution of Recycled Altered Oceanic Crust to Arc Magmas Using Ba‐Sr‐Nd Isotopes</title><title>Journal of geophysical research. Solid earth</title><description>Altered oceanic crust (AOC) plays a critical role in geochemical recycling in subduction zones. However, identifying contributions of subducted AOC to arc magmas remains a conundrum due to the lack of effective tracers. Here, we investigate the Ba‐Sr‐Nd isotopic compositions of lavas from the Mariana arc and back‐arc. Based on a statistical analysis of the Sr‐Nd isotopes for global arc volcanoes, we confirm that AOC‐derived fluid (or hydrous melt), rather than sediment‐derived melt or fluid, is responsible for the Sr‐Nd isotope decoupling (i.e., 87Sr/86Sr is “excessively” enriched relative to 143Nd/144Nd when compared to the “normal” mantle derivates) observed in island arc lavas. We show that the arc lavas with increasingly decoupled Sr‐Nd isotopes generally have heavier Ba isotope ratios, which is also a characteristic feature of AOC‐derived fluids. Thus, these results establish an intimate link between subducted AOC, heavy Ba isotope compositions, and Sr‐Nd isotope decoupling signature in island arcs, which provides a powerful tool to trace the AOC recycling in subduction zones. Furthermore, a similar correlation is observed between Sr‐Nd isotope decoupling and heavy B isotope ratios for global arc lavas, implying that the recycling of AOC component is generally linked to serpentinite dehydration in subduction zones.
Plain Language Summary
Altered oceanic crust (AOC) is an important subduction component that contributes to the generation of arc magmas. However, identifying this contribution to arc magmas is challenging for the lack of effective tracers. Nonetheless, AOC has two characteristic features: (a) Sr‐Nd isotope decoupling (i.e., enriched in 87Sr/86Sr relative to 143Nd/144Nd in contrast to the “normal” mantle array); and (b) relatively heavy Ba isotope compositions. Here, we analyze the Ba‐Sr‐Nd isotopic compositions of lavas from the Mariana arc and back‐arc, which are combined with a statistical analysis of the Sr‐Nd isotopes for global arc volcanoes. Our results confirm that fluid (or hydrous melt) derived from subducted AOC, rather than sediment, is responsible for the Sr‐Nd isotope decoupling observed in island arc lavas. Strikingly, the magnitude of the Sr‐Nd isotope decoupling correlates well with the Ba isotope compositions of the arc lavas. Thus, our results establish an intimate link between subducted AOC, heavy Ba isotope ratios, and Sr‐Nd isotope decoupling signature in island arcs. This combination of Ba‐Sr‐Nd isotopes can therefore now be used as a powerful tracer to identify the contributions of subducted AOC to arc magmas. Our results also suggest that AOC and serpentinite show synergistic behavior during subduction recycling.
Key Points
Global arc data confirm that the Sr‐Nd isotope decoupling of arc lavas is caused by AOC‐derived fluid
Decoupled Sr‐Nd isotopes plus heavy Ba isotope is a good tracer for recycled altered oceanic crust (AOC) in arc magmas
AOC and serpentinite show synergistic behaviors during subduction recycling</description><subject>altered oceanic crust</subject><subject>arc magma</subject><subject>Ba isotope</subject><subject>Barium isotopes</subject><subject>Composition</subject><subject>Decoupling</subject><subject>Dehydration</subject><subject>Fluids</subject><subject>Island arcs</subject><subject>Isotope composition</subject><subject>Isotope ratios</subject><subject>Isotopes</subject><subject>Neodymium isotopes</subject><subject>Oceanic crust</subject><subject>Recycling</subject><subject>Sediment</subject><subject>Serpentinite</subject><subject>Sr‐Nd isotope decoupling</subject><subject>Statistical analysis</subject><subject>Statistical methods</subject><subject>Statistics</subject><subject>Strontium</subject><subject>Strontium 87</subject><subject>Strontium isotopes</subject><subject>Subduction</subject><subject>Subduction (geology)</subject><subject>subduction recycling</subject><subject>Subduction zones</subject><subject>Tracers</subject><subject>Volcanoes</subject><issn>2169-9313</issn><issn>2169-9356</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2024</creationdate><recordtype>article</recordtype><recordid>eNp9kE1OwzAQhS0EEhV0xwEssSXgvzj2sg1QWhUqFbqOHMcpqdI42IlQdxyBM3ISXBUhVsxi3mj06c3oAXCB0TVGRN4QROhsjIhgKDkCA4K5jCSN-fHvjOkpGHq_QaFEWGE2AMWt0VX7alzVrGFqm85Ved9VtoG2hEujd7o2BRzVnXFBF9qoptIwdb3vYGfhyGn4qNZb5eHK7y3G6uvj89mF9lTAqbedbY0_Byelqr0Z_ugZWN3fvaQP0XwxmaajeaQoRTjSSc6oyJnkpJCcmkSUkhISG0Z5opHknMRIsaLUKucyoYSTwCZYMCKQiEt6Bi4Pvq2zb73xXbaxvWvCyYxIkSDCWUwDdXWgtLPeO1Nmrau2yu0yjLJ9lNnfKANOD_h7VZvdv2w2myzHMQ8v0W9w5HPj</recordid><startdate>202403</startdate><enddate>202403</enddate><creator>Zhang, Yuxiang</creator><creator>Shu, Yunchao</creator><creator>Turner, Simon</creator><creator>Chen, Zuxing</creator><creator>Zeng, Zhigang</creator><creator>Huang, Fang</creator><general>Blackwell Publishing Ltd</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7ST</scope><scope>7TG</scope><scope>8FD</scope><scope>C1K</scope><scope>F1W</scope><scope>FR3</scope><scope>H8D</scope><scope>H96</scope><scope>KL.</scope><scope>KR7</scope><scope>L.G</scope><scope>L7M</scope><scope>SOI</scope><orcidid>https://orcid.org/0000-0002-7495-3053</orcidid><orcidid>https://orcid.org/0000-0003-1437-8728</orcidid><orcidid>https://orcid.org/0000-0003-1885-3311</orcidid></search><sort><creationdate>202403</creationdate><title>Deciphering Contribution of Recycled Altered Oceanic Crust to Arc Magmas Using Ba‐Sr‐Nd Isotopes</title><author>Zhang, Yuxiang ; Shu, Yunchao ; Turner, Simon ; Chen, Zuxing ; Zeng, Zhigang ; Huang, Fang</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a3301-c7b438b4962d963e78f93225e4367c0966250a4dfcab6973262496718428085f3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2024</creationdate><topic>altered oceanic crust</topic><topic>arc magma</topic><topic>Ba isotope</topic><topic>Barium isotopes</topic><topic>Composition</topic><topic>Decoupling</topic><topic>Dehydration</topic><topic>Fluids</topic><topic>Island arcs</topic><topic>Isotope composition</topic><topic>Isotope ratios</topic><topic>Isotopes</topic><topic>Neodymium isotopes</topic><topic>Oceanic crust</topic><topic>Recycling</topic><topic>Sediment</topic><topic>Serpentinite</topic><topic>Sr‐Nd isotope decoupling</topic><topic>Statistical analysis</topic><topic>Statistical methods</topic><topic>Statistics</topic><topic>Strontium</topic><topic>Strontium 87</topic><topic>Strontium isotopes</topic><topic>Subduction</topic><topic>Subduction (geology)</topic><topic>subduction recycling</topic><topic>Subduction zones</topic><topic>Tracers</topic><topic>Volcanoes</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Zhang, Yuxiang</creatorcontrib><creatorcontrib>Shu, Yunchao</creatorcontrib><creatorcontrib>Turner, Simon</creatorcontrib><creatorcontrib>Chen, Zuxing</creatorcontrib><creatorcontrib>Zeng, Zhigang</creatorcontrib><creatorcontrib>Huang, Fang</creatorcontrib><collection>CrossRef</collection><collection>Environment Abstracts</collection><collection>Meteorological & Geoastrophysical Abstracts</collection><collection>Technology Research Database</collection><collection>Environmental Sciences and Pollution Management</collection><collection>ASFA: Aquatic Sciences and Fisheries Abstracts</collection><collection>Engineering Research Database</collection><collection>Aerospace Database</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) 2: Ocean Technology, Policy & Non-Living Resources</collection><collection>Meteorological & Geoastrophysical Abstracts - Academic</collection><collection>Civil Engineering Abstracts</collection><collection>Aquatic Science & Fisheries Abstracts (ASFA) Professional</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>Environment Abstracts</collection><jtitle>Journal of geophysical research. Solid earth</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Zhang, Yuxiang</au><au>Shu, Yunchao</au><au>Turner, Simon</au><au>Chen, Zuxing</au><au>Zeng, Zhigang</au><au>Huang, Fang</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Deciphering Contribution of Recycled Altered Oceanic Crust to Arc Magmas Using Ba‐Sr‐Nd Isotopes</atitle><jtitle>Journal of geophysical research. Solid earth</jtitle><date>2024-03</date><risdate>2024</risdate><volume>129</volume><issue>3</issue><epage>n/a</epage><issn>2169-9313</issn><eissn>2169-9356</eissn><abstract>Altered oceanic crust (AOC) plays a critical role in geochemical recycling in subduction zones. However, identifying contributions of subducted AOC to arc magmas remains a conundrum due to the lack of effective tracers. Here, we investigate the Ba‐Sr‐Nd isotopic compositions of lavas from the Mariana arc and back‐arc. Based on a statistical analysis of the Sr‐Nd isotopes for global arc volcanoes, we confirm that AOC‐derived fluid (or hydrous melt), rather than sediment‐derived melt or fluid, is responsible for the Sr‐Nd isotope decoupling (i.e., 87Sr/86Sr is “excessively” enriched relative to 143Nd/144Nd when compared to the “normal” mantle derivates) observed in island arc lavas. We show that the arc lavas with increasingly decoupled Sr‐Nd isotopes generally have heavier Ba isotope ratios, which is also a characteristic feature of AOC‐derived fluids. Thus, these results establish an intimate link between subducted AOC, heavy Ba isotope compositions, and Sr‐Nd isotope decoupling signature in island arcs, which provides a powerful tool to trace the AOC recycling in subduction zones. Furthermore, a similar correlation is observed between Sr‐Nd isotope decoupling and heavy B isotope ratios for global arc lavas, implying that the recycling of AOC component is generally linked to serpentinite dehydration in subduction zones.
Plain Language Summary
Altered oceanic crust (AOC) is an important subduction component that contributes to the generation of arc magmas. However, identifying this contribution to arc magmas is challenging for the lack of effective tracers. Nonetheless, AOC has two characteristic features: (a) Sr‐Nd isotope decoupling (i.e., enriched in 87Sr/86Sr relative to 143Nd/144Nd in contrast to the “normal” mantle array); and (b) relatively heavy Ba isotope compositions. Here, we analyze the Ba‐Sr‐Nd isotopic compositions of lavas from the Mariana arc and back‐arc, which are combined with a statistical analysis of the Sr‐Nd isotopes for global arc volcanoes. Our results confirm that fluid (or hydrous melt) derived from subducted AOC, rather than sediment, is responsible for the Sr‐Nd isotope decoupling observed in island arc lavas. Strikingly, the magnitude of the Sr‐Nd isotope decoupling correlates well with the Ba isotope compositions of the arc lavas. Thus, our results establish an intimate link between subducted AOC, heavy Ba isotope ratios, and Sr‐Nd isotope decoupling signature in island arcs. This combination of Ba‐Sr‐Nd isotopes can therefore now be used as a powerful tracer to identify the contributions of subducted AOC to arc magmas. Our results also suggest that AOC and serpentinite show synergistic behavior during subduction recycling.
Key Points
Global arc data confirm that the Sr‐Nd isotope decoupling of arc lavas is caused by AOC‐derived fluid
Decoupled Sr‐Nd isotopes plus heavy Ba isotope is a good tracer for recycled altered oceanic crust (AOC) in arc magmas
AOC and serpentinite show synergistic behaviors during subduction recycling</abstract><cop>Washington</cop><pub>Blackwell Publishing Ltd</pub><doi>10.1029/2023JB028407</doi><tpages>13</tpages><orcidid>https://orcid.org/0000-0002-7495-3053</orcidid><orcidid>https://orcid.org/0000-0003-1437-8728</orcidid><orcidid>https://orcid.org/0000-0003-1885-3311</orcidid></addata></record> |
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| identifier | ISSN: 2169-9313 |
| ispartof | Journal of geophysical research. Solid earth, 2024-03, Vol.129 (3), p.n/a |
| issn | 2169-9313 2169-9356 |
| language | eng |
| recordid | cdi_proquest_journals_2987026453 |
| source | Wiley Online Library Journals Frontfile Complete |
| subjects | altered oceanic crust arc magma Ba isotope Barium isotopes Composition Decoupling Dehydration Fluids Island arcs Isotope composition Isotope ratios Isotopes Neodymium isotopes Oceanic crust Recycling Sediment Serpentinite Sr‐Nd isotope decoupling Statistical analysis Statistical methods Statistics Strontium Strontium 87 Strontium isotopes Subduction Subduction (geology) subduction recycling Subduction zones Tracers Volcanoes |
| title | Deciphering Contribution of Recycled Altered Oceanic Crust to Arc Magmas Using Ba‐Sr‐Nd Isotopes |
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