A search for 142 Nd evidence of primordial mantle heterogeneities in plume basalts

International audience In order to assess whether material differentiated shortly after terrestrial accretion is still present in the deep mantle, we investigated hot spot basalts for 142Nd/144Nd anomalies that could attest for the presence of live 146Sm (T1/2 = 103 My) at the time the mantle source...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Boyet, Maud, O. Garcia, Michael, Pik, Raphaël, Albarède, Francis
Other Authors: Laboratoire de Sciences de la Terre (LST), École normale supérieure - Lyon (ENS Lyon)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS), PNP
Format: Article in Journal/Newspaper
Language:English
Published: HAL CCSD 2005
Subjects:
[SDU]Sciences of the Universe [physics]
Iceland
Online Access:https://hal.science/hal-00098369
https://hal.science/hal-00098369/document
https://hal.science/hal-00098369/file/2004GL021873.pdf
https://doi.org/10.1029/2004GL021873
Description
Summary:International audience In order to assess whether material differentiated shortly after terrestrial accretion is still present in the deep mantle, we investigated hot spot basalts for 142Nd/144Nd anomalies that could attest for the presence of live 146Sm (T1/2 = 103 My) at the time the mantle source of these basalts formed. We analyzed high 3He/4He basalts from Loihi and Ethiopia and normal 3He/4He basalts from Iceland. Although the 143Nd/144Nd ratios of these basalts reflect a source with long-term LREE (light rare earth elements) depletion, no resolvable 142Nd anomalies were detected. Taking the analytical uncertainties (10–20 ppm) into account, however, the present results do not rule out the possibility that a large proportion of material fractionated very early in the Earth's history may still be hidden in the deep mantle

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