Lab ID	Database ID		Seamount	Depth (m)	Age (years)	143Nd/144Nd (ą 2s SE)	epsilon Nd  (ą 2s SE)								
																		
																		
UAM06	ALV-3891-1459-003-011	Gregg		1176		315   ą 35	0.511879 ą 0.000023	-14.8 ą 0.4						
UAM05	ALV-3891-1459-003-007	Gregg		1176		11623 ą 212	0.511896 ą 0.000009	-14.5 ą 0.2						
UAM08	ALV-3891-1459-003-006	Gregg		1176		11724 ą 400	0.511877 ą 0.000010	-14.8 ą 0.2						
UAM07	ALV-3891-1459-003-006	Gregg		1176		12638 ą 328	0.511941 ą 0.000010	-13.6 ą 0.2						
UAI01	ALV-3885-1452-004-007	Muir		1878		50351 ą 355	0.511952 ą 0.000009	-13.4 ą 0.2						
UAL12	ALV-3887-1652-005-006	Muir		2265		12643 ą 84	0.511949 ą 0.000014	-13.4 ą 0.3						
UAJ04	ALV-3887-1549-004-002	Muir		2372		15402 ą 102	0.512018 ą 0.000016	-12.1 ą 0.3						
  duplicate run									0.512021 ą 0.000013	-12.0 ą 0.3						
UAK02	ALV-3887-1549-004-004	Muir		2372		16168 ą 116	0.511948 ą 0.000022	-13.5 ą 0.4						
UAI06	ALV-3887-1436-003-006	Muir		2441		91181 ą 882	0.512001 ą 0.000016	-12.4 ą 0.3						
  duplicate run									0.512022 ą 0.000010	-12.0 ą 0.2			
UAI20	ALV-3887-1324-002-002	Muir		2546		12449 ą 117	0.511970 ą 0.000011	-13.0 ą 0.2			
															
Neodymium was extracted from the wash solution of the U-series anion exchange 
chemistry. Following a Fe co-precipitation, rare earth elements were separated 
from the remaining major and trace elements on Eichrom TRU-spec resin. Neodymium 
was subsequently separated from the other REE using alpha-hydroxyisobutyric acid 
(a-HIBA) and cation resin. Neodymium isotopes were measured at Lamont-Doherty Earth
Observatory on a Micromass Sector 54-30 thermal ionisation mass spectrometer by 
dynamic multicollection. Samples were measured as NdO+ loaded with Si gel,using a
146Nd/144Nd of 0.7219 to correct for mass fractionation. Replications of 5 to 35 
ng La Jolla Nd standards over the course of the sample analyses gave an average
of 0.511850 ą 0.000016 (2 sigma external standard deviation; n = 13). Except for 
two samples (see Table 2) internal 2 sigma standard errors of individual runs 
were smaller than the external error. All reported 143Nd/144Nd ratios were 
normalized to a nominal value for the La Jolla Nd standard of 0.511858. Epsilon 
Nd was calculated using a CHUR of 0.512638 [Jacobsen and Wasserburg, 1980].