Physics
Scientific paper
Feb 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3204306b&link_type=abstract
Geophysical Research Letters, Volume 32, Issue 4, CiteID L04306
Physics
4
Geochemistry: Mantle Processes (3621), Geochemistry: Composition Of The Mantle, Geochemistry: Radiogenic Isotope Geochemistry, Geochemistry: Planetary Geochemistry (5405, 5410, 5704, 5709, 6005, 6008), Geochemistry: Instruments And Techniques
Scientific paper
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.
Albarède Francis
Boyet M. M.
Garcia Michael O.
Pik Raphael
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