Experimental evidence for the origin of lead enrichment in convergent-margin magmas
IT has been proposed 1–5 that the low Ce/Pb ratio of subduction-related basalts, relative to their oceanic counterparts, arises by the preferential transfer of lead to the mantle wedge (overlying the subducting slab) by non-magmatic processes. Fluxing of the mantle wedge by low-Ce/Pb fluids, generat...
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| Veröffentlicht in: | Nature (London) 1995-11, Vol.378 (6552), p.54-56 |
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| creator | Brenan, James M. Shaw, Henry F. Ryerson, Frederick J. |
| description | IT has been proposed
1–5
that the low Ce/Pb ratio of subduction-related basalts, relative to their oceanic counterparts, arises by the preferential transfer of lead to the mantle wedge (overlying the subducting slab) by non-magmatic processes. Fluxing of the mantle wedge by low-Ce/Pb fluids, generated by the dehydration of sub-ducted oceanic crust, is one mechanism favoured for this process (see, for example, ref. 5). Here we report the results of a series of high-pressure experiments, which confirm that low-Ce/Pb fluids coexist with the dominant mineral phases (garnet and clinopyroxene) produced during high-pressure dehydration of altered basalt. Our results show that the production of subduction-zone magmas from mantle sources fluxed by basalt-derived fluid is a mechanism by which relatively lead-rich, cerium-poor, mantle-derived material is added to the continents. The lead enrichment of the Earth's continental crust is thus a continuing process occurring at conver-gent margins. |
| doi_str_mv | 10.1038/378054a0 |
| format | Article |
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1–5
that the low Ce/Pb ratio of subduction-related basalts, relative to their oceanic counterparts, arises by the preferential transfer of lead to the mantle wedge (overlying the subducting slab) by non-magmatic processes. Fluxing of the mantle wedge by low-Ce/Pb fluids, generated by the dehydration of sub-ducted oceanic crust, is one mechanism favoured for this process (see, for example, ref. 5). Here we report the results of a series of high-pressure experiments, which confirm that low-Ce/Pb fluids coexist with the dominant mineral phases (garnet and clinopyroxene) produced during high-pressure dehydration of altered basalt. Our results show that the production of subduction-zone magmas from mantle sources fluxed by basalt-derived fluid is a mechanism by which relatively lead-rich, cerium-poor, mantle-derived material is added to the continents. The lead enrichment of the Earth's continental crust is thus a continuing process occurring at conver-gent margins.</description><identifier>ISSN: 0028-0836</identifier><identifier>EISSN: 1476-4687</identifier><identifier>DOI: 10.1038/378054a0</identifier><identifier>CODEN: NATUAS</identifier><language>eng</language><publisher>London: Nature Publishing Group UK</publisher><subject>Basalt ; Continental crust ; Crystalline rocks ; Dehydration ; Earth sciences ; Earth, ocean, space ; Exact sciences and technology ; Geology ; Humanities and Social Sciences ; Igneous and metamorphic rocks petrology, volcanic processes, magmas ; Isotope geochemistry ; Isotope geochemistry. Geochronology ; Lava ; Lead ; letter ; Marine ; Minerals ; multidisciplinary ; Physics ; Science ; Science (multidisciplinary)</subject><ispartof>Nature (London), 1995-11, Vol.378 (6552), p.54-56</ispartof><rights>Springer Nature Limited 1995</rights><rights>1996 INIST-CNRS</rights><rights>Copyright Macmillan Journals Ltd. Nov 2, 1995</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a400t-a7b99e0382b36f3f9310e1e3ff7bfb0a0bead4f81a122cb47710fccd80e8f7fa3</citedby><cites>FETCH-LOGICAL-a400t-a7b99e0382b36f3f9310e1e3ff7bfb0a0bead4f81a122cb47710fccd80e8f7fa3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1038/378054a0$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1038/378054a0$$EHTML$$P50$$Gspringer$$H</linktohtml><link.rule.ids>314,776,780,27901,27902,41464,42533,51294</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=2890655$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Brenan, James M.</creatorcontrib><creatorcontrib>Shaw, Henry F.</creatorcontrib><creatorcontrib>Ryerson, Frederick J.</creatorcontrib><title>Experimental evidence for the origin of lead enrichment in convergent-margin magmas</title><title>Nature (London)</title><addtitle>Nature</addtitle><description>IT has been proposed
1–5
that the low Ce/Pb ratio of subduction-related basalts, relative to their oceanic counterparts, arises by the preferential transfer of lead to the mantle wedge (overlying the subducting slab) by non-magmatic processes. Fluxing of the mantle wedge by low-Ce/Pb fluids, generated by the dehydration of sub-ducted oceanic crust, is one mechanism favoured for this process (see, for example, ref. 5). Here we report the results of a series of high-pressure experiments, which confirm that low-Ce/Pb fluids coexist with the dominant mineral phases (garnet and clinopyroxene) produced during high-pressure dehydration of altered basalt. Our results show that the production of subduction-zone magmas from mantle sources fluxed by basalt-derived fluid is a mechanism by which relatively lead-rich, cerium-poor, mantle-derived material is added to the continents. The lead enrichment of the Earth's continental crust is thus a continuing process occurring at conver-gent margins.</description><subject>Basalt</subject><subject>Continental crust</subject><subject>Crystalline rocks</subject><subject>Dehydration</subject><subject>Earth sciences</subject><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><subject>Geology</subject><subject>Humanities and Social Sciences</subject><subject>Igneous and metamorphic rocks petrology, volcanic processes, magmas</subject><subject>Isotope geochemistry</subject><subject>Isotope geochemistry. 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1–5
that the low Ce/Pb ratio of subduction-related basalts, relative to their oceanic counterparts, arises by the preferential transfer of lead to the mantle wedge (overlying the subducting slab) by non-magmatic processes. Fluxing of the mantle wedge by low-Ce/Pb fluids, generated by the dehydration of sub-ducted oceanic crust, is one mechanism favoured for this process (see, for example, ref. 5). Here we report the results of a series of high-pressure experiments, which confirm that low-Ce/Pb fluids coexist with the dominant mineral phases (garnet and clinopyroxene) produced during high-pressure dehydration of altered basalt. Our results show that the production of subduction-zone magmas from mantle sources fluxed by basalt-derived fluid is a mechanism by which relatively lead-rich, cerium-poor, mantle-derived material is added to the continents. The lead enrichment of the Earth's continental crust is thus a continuing process occurring at conver-gent margins.</abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><doi>10.1038/378054a0</doi><tpages>3</tpages></addata></record> |
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| ispartof | Nature (London), 1995-11, Vol.378 (6552), p.54-56 |
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| subjects | Basalt Continental crust Crystalline rocks Dehydration Earth sciences Earth, ocean, space Exact sciences and technology Geology Humanities and Social Sciences Igneous and metamorphic rocks petrology, volcanic processes, magmas Isotope geochemistry Isotope geochemistry. Geochronology Lava Lead letter Marine Minerals multidisciplinary Physics Science Science (multidisciplinary) |
| title | Experimental evidence for the origin of lead enrichment in convergent-margin magmas |
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