Lead isotope evidence for young trace element enrichment in the oceanic upper mantle
ISOTOPIC heterogeneity in ocean island basalts has generally been ascribed to processes related to the long-term cycling of mantle material 1–6 . A recent study of Cameroon line lavas reported higher 208 Pb/< 204 Pb and 206 Pb/< 204 Pb ratios towards the continent/ocean boundary (c.o.b.), but...
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| Veröffentlicht in: | Nature (London) 1992-10, Vol.359 (6396), p.623-627 |
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| description | ISOTOPIC heterogeneity in ocean island basalts has generally been ascribed to processes related to the long-term cycling of mantle material
1–6
. A recent study of Cameroon line lavas reported higher
208
Pb/<
204
Pb and
206
Pb/<
204
Pb ratios towards the continent/ocean boundary (c.o.b.), but no corresponding increase in
207
Pb/<
204
Pb, indicating large
in situ
fractionations of uranium and thorium relative to lead in the upper mantle ∼10
8
years ago
7
. Here we present neodymium, strontium and lead isotope data for a variety of central Atlantic islands, and show that similar offsets in lead isotope ratios are found in lavas from the islands of Madeira and Trinidade. Like the Cameroon line c.o.b. lavas, these lavas are characterized by high U/Pb and Ce/Pb, low K/U and are located in areas of old oceanic lithosphere
8
. But in contrast to the Cameroon line
7
, the Madeira lavas are derived from an enriched MORB-type source with low
207
Pb/<
204
Pb and
87
Sr/<
86
Sr and high
143
Nd/<
144
Nd The lead isotope data can be explained if the U/Pb ratios in the sources are comparable to those observed for the lavas and the U/Pb fractionation occurred at the time of formation of the local oceanic lithosphere. Although we do not have a satisfactory explanation for the U/Pb fractionation, it must have occurred at shallow depths in the mantle, near a spreading ridge; and the resulting enriched source regions have since remained fixed relative to the migrating lithosphere. |
| doi_str_mv | 10.1038/359623a0 |
| format | Article |
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1–6
. A recent study of Cameroon line lavas reported higher
208
Pb/<
204
Pb and
206
Pb/<
204
Pb ratios towards the continent/ocean boundary (c.o.b.), but no corresponding increase in
207
Pb/<
204
Pb, indicating large
in situ
fractionations of uranium and thorium relative to lead in the upper mantle ∼10
8
years ago
7
. Here we present neodymium, strontium and lead isotope data for a variety of central Atlantic islands, and show that similar offsets in lead isotope ratios are found in lavas from the islands of Madeira and Trinidade. Like the Cameroon line c.o.b. lavas, these lavas are characterized by high U/Pb and Ce/Pb, low K/U and are located in areas of old oceanic lithosphere
8
. But in contrast to the Cameroon line
7
, the Madeira lavas are derived from an enriched MORB-type source with low
207
Pb/<
204
Pb and
87
Sr/<
86
Sr and high
143
Nd/<
144
Nd The lead isotope data can be explained if the U/Pb ratios in the sources are comparable to those observed for the lavas and the U/Pb fractionation occurred at the time of formation of the local oceanic lithosphere. Although we do not have a satisfactory explanation for the U/Pb fractionation, it must have occurred at shallow depths in the mantle, near a spreading ridge; and the resulting enriched source regions have since remained fixed relative to the migrating lithosphere.]]></description><identifier>ISSN: 0028-0836</identifier><identifier>EISSN: 1476-4687</identifier><identifier>DOI: 10.1038/359623a0</identifier><identifier>CODEN: NATUAS</identifier><language>eng</language><publisher>London: Nature Publishing Group UK</publisher><subject>Crystalline rocks ; Earth sciences ; Earth, ocean, space ; Exact sciences and technology ; Fractionation ; Geochronology ; Geology ; Humanities and Social Sciences ; Igneous and metamorphic rocks petrology, volcanic processes, magmas ; Isotope geochemistry. Geochronology ; letter ; Lithosphere ; Marine ; multidisciplinary ; Neodymium ; Physics ; Science ; Science (multidisciplinary) ; Strontium ; Trace elements ; Upper mantle ; Uranium</subject><ispartof>Nature (London), 1992-10, Vol.359 (6396), p.623-627</ispartof><rights>Springer Nature Limited 1992</rights><rights>1993 INIST-CNRS</rights><rights>Copyright Macmillan Journals Ltd. Oct 15, 1992</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-a434t-c47480d43f11044b7f811d283d3b162027d0723ba003ffd3ea1b9b3e99ad6fe93</citedby><cites>FETCH-LOGICAL-a434t-c47480d43f11044b7f811d283d3b162027d0723ba003ffd3ea1b9b3e99ad6fe93</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktopdf>$$Uhttps://link.springer.com/content/pdf/10.1038/359623a0$$EPDF$$P50$$Gspringer$$H</linktopdf><linktohtml>$$Uhttps://link.springer.com/10.1038/359623a0$$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=4329946$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Halliday, Alex N.</creatorcontrib><creatorcontrib>Davies, Gareth R.</creatorcontrib><creatorcontrib>Lee, Der-Chuen</creatorcontrib><creatorcontrib>Tommasini, Simone</creatorcontrib><creatorcontrib>Paslick, Cassi R.</creatorcontrib><creatorcontrib>Fitton, J. Godfrey</creatorcontrib><creatorcontrib>James, Dodie E.</creatorcontrib><title>Lead isotope evidence for young trace element enrichment in the oceanic upper mantle</title><title>Nature (London)</title><addtitle>Nature</addtitle><description><![CDATA[ISOTOPIC heterogeneity in ocean island basalts has generally been ascribed to processes related to the long-term cycling of mantle material
1–6
. A recent study of Cameroon line lavas reported higher
208
Pb/<
204
Pb and
206
Pb/<
204
Pb ratios towards the continent/ocean boundary (c.o.b.), but no corresponding increase in
207
Pb/<
204
Pb, indicating large
in situ
fractionations of uranium and thorium relative to lead in the upper mantle ∼10
8
years ago
7
. Here we present neodymium, strontium and lead isotope data for a variety of central Atlantic islands, and show that similar offsets in lead isotope ratios are found in lavas from the islands of Madeira and Trinidade. Like the Cameroon line c.o.b. lavas, these lavas are characterized by high U/Pb and Ce/Pb, low K/U and are located in areas of old oceanic lithosphere
8
. But in contrast to the Cameroon line
7
, the Madeira lavas are derived from an enriched MORB-type source with low
207
Pb/<
204
Pb and
87
Sr/<
86
Sr and high
143
Nd/<
144
Nd The lead isotope data can be explained if the U/Pb ratios in the sources are comparable to those observed for the lavas and the U/Pb fractionation occurred at the time of formation of the local oceanic lithosphere. Although we do not have a satisfactory explanation for the U/Pb fractionation, it must have occurred at shallow depths in the mantle, near a spreading ridge; and the resulting enriched source regions have since remained fixed relative to the migrating lithosphere.]]></description><subject>Crystalline rocks</subject><subject>Earth sciences</subject><subject>Earth, ocean, space</subject><subject>Exact sciences and technology</subject><subject>Fractionation</subject><subject>Geochronology</subject><subject>Geology</subject><subject>Humanities and Social Sciences</subject><subject>Igneous and metamorphic rocks petrology, volcanic processes, magmas</subject><subject>Isotope geochemistry. Geochronology</subject><subject>letter</subject><subject>Lithosphere</subject><subject>Marine</subject><subject>multidisciplinary</subject><subject>Neodymium</subject><subject>Physics</subject><subject>Science</subject><subject>Science (multidisciplinary)</subject><subject>Strontium</subject><subject>Trace elements</subject><subject>Upper mantle</subject><subject>Uranium</subject><issn>0028-0836</issn><issn>1476-4687</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1992</creationdate><recordtype>article</recordtype><sourceid>8G5</sourceid><sourceid>BEC</sourceid><sourceid>BENPR</sourceid><sourceid>GUQSH</sourceid><sourceid>M2O</sourceid><recordid>eNqF0VFLHDEQB_BQWuhVhX6EUEqpD6tJJpdNHsthVTjwRZ-XbHbi7bGXrMlu4b69qacW6oNPmTA__pMwhHzl7Iwz0OewNEqAZR_IgstaVVLp-iNZMCZ0xTSoz-RLzlvG2JLXckFu12g72uc4xREp_uk7DA6pj4nu4xzu6ZRsueOAOwwTxZB6t3kq-0CnDdLo0Ibe0XkcMdGdDdOAx-STt0PGk-fziNz9vrhdXVXrm8vr1a91ZSXIqXKylpp1EjznTMq29przTmjooOVKMFF3rBbQWsbA-w7Q8ta0gMbYTnk0cER-HHLHFB9mzFOz67PDYbAB45wbsVR6CQrehWWa4crIAr_9B7dxTqF8ohHliWAk1wX9PCCXYs4JfTOmfmfTvuGs-buE5mUJhX5_zrPZ2cEnG1yfX70EYYxUhZ0eWC6dcI_p39g3kY-k7pHz</recordid><startdate>19921015</startdate><enddate>19921015</enddate><creator>Halliday, Alex N.</creator><creator>Davies, Gareth R.</creator><creator>Lee, Der-Chuen</creator><creator>Tommasini, Simone</creator><creator>Paslick, Cassi R.</creator><creator>Fitton, J. 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Godfrey ; James, Dodie E.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-a434t-c47480d43f11044b7f811d283d3b162027d0723ba003ffd3ea1b9b3e99ad6fe93</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1992</creationdate><topic>Crystalline rocks</topic><topic>Earth sciences</topic><topic>Earth, ocean, space</topic><topic>Exact sciences and technology</topic><topic>Fractionation</topic><topic>Geochronology</topic><topic>Geology</topic><topic>Humanities and Social Sciences</topic><topic>Igneous and metamorphic rocks petrology, volcanic processes, magmas</topic><topic>Isotope geochemistry. 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Godfrey</au><au>James, Dodie E.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Lead isotope evidence for young trace element enrichment in the oceanic upper mantle</atitle><jtitle>Nature (London)</jtitle><stitle>Nature</stitle><date>1992-10-15</date><risdate>1992</risdate><volume>359</volume><issue>6396</issue><spage>623</spage><epage>627</epage><pages>623-627</pages><issn>0028-0836</issn><eissn>1476-4687</eissn><coden>NATUAS</coden><abstract><![CDATA[ISOTOPIC heterogeneity in ocean island basalts has generally been ascribed to processes related to the long-term cycling of mantle material
1–6
. A recent study of Cameroon line lavas reported higher
208
Pb/<
204
Pb and
206
Pb/<
204
Pb ratios towards the continent/ocean boundary (c.o.b.), but no corresponding increase in
207
Pb/<
204
Pb, indicating large
in situ
fractionations of uranium and thorium relative to lead in the upper mantle ∼10
8
years ago
7
. Here we present neodymium, strontium and lead isotope data for a variety of central Atlantic islands, and show that similar offsets in lead isotope ratios are found in lavas from the islands of Madeira and Trinidade. Like the Cameroon line c.o.b. lavas, these lavas are characterized by high U/Pb and Ce/Pb, low K/U and are located in areas of old oceanic lithosphere
8
. But in contrast to the Cameroon line
7
, the Madeira lavas are derived from an enriched MORB-type source with low
207
Pb/<
204
Pb and
87
Sr/<
86
Sr and high
143
Nd/<
144
Nd The lead isotope data can be explained if the U/Pb ratios in the sources are comparable to those observed for the lavas and the U/Pb fractionation occurred at the time of formation of the local oceanic lithosphere. Although we do not have a satisfactory explanation for the U/Pb fractionation, it must have occurred at shallow depths in the mantle, near a spreading ridge; and the resulting enriched source regions have since remained fixed relative to the migrating lithosphere.]]></abstract><cop>London</cop><pub>Nature Publishing Group UK</pub><doi>10.1038/359623a0</doi><tpages>5</tpages><oa>free_for_read</oa></addata></record> |
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| language | eng |
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| source | Springer Nature - Complete Springer Journals; Nature |
| subjects | Crystalline rocks Earth sciences Earth, ocean, space Exact sciences and technology Fractionation Geochronology Geology Humanities and Social Sciences Igneous and metamorphic rocks petrology, volcanic processes, magmas Isotope geochemistry. Geochronology letter Lithosphere Marine multidisciplinary Neodymium Physics Science Science (multidisciplinary) Strontium Trace elements Upper mantle Uranium |
| title | Lead isotope evidence for young trace element enrichment in the oceanic upper mantle |
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