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<title lang=en>Unradiogenic lead in Earth's upper mantle</title>
<creator>Burton, K. W.</creator>
<creator>Cenki-Tok, Bénédicte</creator>
<creator>Mokadem, Fatima</creator>
<creator>Harvey, J.</creator>
<creator>Gannoun, A.</creator>
<creator>Alard, Olivier</creator>
<creator>Parkinson, I. J.</creator>
<contributor>Centre for Earth, Planetary, Space and Astronomical Research [Milton Keynes] (CEPSAR) ; The Open University [Milton Keynes] (OU)</contributor>
<contributor>Dynamique de la Lithosphere ; Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS) - Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Department of Earth and Environmental Sciences, The Open University, Milton Keynes ; Université du Québec</contributor>
<contributor>Laboratoire Magmas et Volcans (LMV) ; Université Blaise Pascal - Clermont-Ferrand 2 (UBP) - Institut national des sciences de l'Univers (INSU - CNRS) - Université Jean Monnet [Saint-Étienne] (UJM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<contributor>Manteau et Interfaces ; Géosciences Montpellier ; Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS) - Université des Antilles et de la Guyane (UAG) - Institut national des sciences de l'Univers (INSU - CNRS) - Université de Montpellier (UM) - Centre National de la Recherche Scientifique (CNRS)</contributor>
<description>International audience</description>
<source>ISSN: 1752-0894</source>
<source>Nature Geoscience</source>
<publisher>Nature Publishing Group</publisher>
<identifier>hal-00795575</identifier>
<identifier>https://hal.archives-ouvertes.fr/hal-00795575</identifier>
<source>https://hal.archives-ouvertes.fr/hal-00795575</source>
<source>Nature Geoscience, Nature Publishing Group, 2012, 5, pp.570-573. 〈10.1038/ngeo1531〉</source>
<identifier>DOI : 10.1038/ngeo1531</identifier>
<relation>info:eu-repo/semantics/altIdentifier/doi/10.1038/ngeo1531</relation>
<language>en</language>
<subject>[SDU.STU.GC] Sciences of the Universe [physics]/Earth Sciences/Geochemistry</subject>
<subject>[SDE.MCG] Environmental Sciences/Global Changes</subject>
<type>info:eu-repo/semantics/article</type>
<type>Journal articles</type>
<description lang=en>The mantle and continental crust--Earth's main silicate reservoirs--have a lead isotope composition that is too radiogenic to have evolved from primitive Solar System material over 4.57 billion years1. To account for this imbalance, it has been suggested that unradiogenic lead may have partitioned into the metallic core2, 3, 4 or lower continental crust5. Alternatively, radiogenic lead could have been added to Earth later by meteorite impacts6. Unradiogenic lead was discovered in fragments of mantle rocks exhumed in the Horoman massif, Japan, implying that the mantle itself may provide a complementary reservoir of unradiogenic lead7. However, it is unclear why this unradiogenic component is not sampled by the melting that generates oceanic basalts8. Here we present double-spike lead isotope data for abyssal peridotite rocks, considered to represent suboceanic mantle, exposed on the Atlantic Ocean floor. We find that sulphides dated at about 1.83 billion years old and trapped as inclusions in silicate minerals preserve extremely unradiogenic lead isotope compositions. This unradiogenic lead could have been prevented from adding significantly to oceanic basalts if either the silicates shield the sulphide inclusions or if the sulphides reside in refractory mantle rocks that are rarely sampled during melting. We conclude that the lead isotope composition of the silicate Earth could be largely balanced by unradiogenic lead in sulphide in the mantle.</description>
<date>2012-08-01</date>
</dc>
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