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1. Origin of negative cerium anomalies in subduction-related volcanic samples: Constraints from Ce and Nd isotopes

Author

Régis Doucelance, Terry Plank, Nina Bellot, Ivan P. Savov, P. Bonnand, Maud Boyet, Tim Elliott, Laboratoire Magmas et Volcans (LMV), Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Institut de Recherche pour le Développement et la société-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Institut national des sciences de l'Univers (INSU - CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), School of Earth and Environment [Leeds] (SEE), University of Leeds, Lamont-Doherty Earth Observatory (LDEO), Columbia University [New York], School of Earth Sciences [Bristol], University of Bristol [Bristol], Challenge 4, ANR-10-LABX-0006,CLERVOLC,Clermont-Ferrand centre for research on volcanism(2010), ANR-16-IDEX-0001,CAP 20-25,CAP 20-25(2016), Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet [Saint-Étienne] (UJM)-Institut de Recherche pour le Développement et la société-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Institut national des sciences de l'Univers (INSU - CNRS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet [Saint-Étienne] (UJM)-Institut de Recherche pour le Développement et la société-Université Clermont Auvergne (UCA)-Centre National de la Recherche Scientifique (CNRS)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Institut national des sciences de l'Univers (INSU - CNRS)-Université Clermont Auvergne (UCA)-Centre National de la Recherche Scientifique (CNRS)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), ANR-10-LABX-0006/10-LABX-0006,CLERVOLC,Clermont-Ferrand centre for research on volcanism(2010), and ANR: 16-IDEX-0001,CAP 20-25,CAP 20-25 (I-Site)(2017)

Subjects
Rare Earth Elements, 010504 meteorology & atmospheric sciences, Geochemistry, 138Ce/142Ce, Pyroclastic rock, Mariana volcanic arc, Ce anomalies, Sediment recycling, 010502 geochemistry & geophysics, 01 natural sciences, [SDU.STU.PL]Sciences of the Universe [physics]/Earth Sciences/Planetology, [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry, Geochemistry and Petrology, Arc system, 0105 earth and related environmental sciences, Basalt, geography, geography.geographical_feature_category, Volcanic arc, Subduction, Partial melting, Geology, Volcanic rock, 13. Climate action, Mariana Trench
Abstract

International audience; Negative Cerium (Ce) anomalies are observed in chondrite-normalized Rare Earth Element patterns from various volcanic arc suites. These anomalies are well defined in volcanic rocks from the Mariana arc and have been interpreted as the result of addition of subducted sediments to the arc magma sources. This study combines 143Nd/144Nd and 138Ce/142Ce isotope measurements in Mariana volcanic rocks that have Ce anomalies ranging from 0.97 to 0.90. The dataset includes sediments sampled immediately before subduction at the Mariana Trench (Sites 801 and 802 of ODP Leg 129) and primitive basalts from the Southern Mariana Trough (back-arc basin). Binary mixing models between the local depleted mantle and an enriched end-member using both types of sediment (biosiliceous and volcaniclastic) found in the sedimentary column in front of the arc are calculated. Marianas arc lavas have Ce and Nd isotopic compositions that require

Published
2018

2. What coupled cerium and neodymium isotopes tell us about the deep source of oceanic carbonatites

Author

Régis Doucelance, Maud Boyet, Nina Bellot, Chantal Bosq, Tahar Hammouda, Laboratoire Magmas et Volcans (LMV), Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Université Jean Monnet - Saint-Étienne (UJM)-Centre National de la Recherche Scientifique (CNRS), Institut national des sciences de l'Univers (INSU - CNRS)-Université Jean Monnet [Saint-Étienne] (UJM)-Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Observatoire de Physique du Globe de Clermont-Ferrand (OPGC), and Université Blaise Pascal - Clermont-Ferrand 2 (UBP)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
0106 biological sciences, Geochemistry, Cape Verde/Canary archipelagos, [SDU.STU.PE]Sciences of the Universe [physics]/Earth Sciences/Petrography, engineering.material, 010502 geochemistry & geophysics, 010603 evolutionary biology, 01 natural sciences, Mantle (geology), Cape verde, chemistry.chemical_compound, Geochemistry and Petrology, [SDU.STU.GC]Sciences of the Universe [physics]/Earth Sciences/Geochemistry, Titanite, Earth and Planetary Sciences (miscellaneous), 14. Life underwater, oceanic carbonatites, 0105 earth and related environmental sciences, geochemistry, Subduction, Isotope, Silicate, Geophysics, Ce isotopes, chemistry, 13. Climate action, Space and Planetary Science, engineering, Carbonatite, Carbonate, Geology
Abstract

International audience; We present the first Ce isotope compositions together with Nd and Pb isotope ratios measured for whole rocks and mineral separates (apatite, titanite) from oceanic carbonatites and associated silicate samples from the Cape Verde and Canary archipelagos (Atlantic Ocean). We compare them with measurements performed on carbonatites from Tamazert (Morocco) for which a common source has been suggested. We couple the La/Ce and Sm/Nd systems in order to model the rare-earth-element concentrations and the Ce–Nd isotope compositions of marine carbonates and mantle and/or mantle-derived reservoirs, notably the D″ boundary layer. We discuss the two contrasting models that have been previously presented for the origin of the carbon of the oceanic carbonatite source: recycled marine carbonates via subduction vs. primordial carbon. Our measurements favour the recycling of marine carbonates in the source of oceanic carbonatites. We use Pb isotope ratios together with experimental petrology constraints to discuss the age and depth of carbonate recycling in the mantle.

Published
2014

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