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Reynolds, Ben C; Frank, Martin; Burton, Kevin W (2006): (Table 1) Estimated e-Nd(0) input calculated using the relative fraction of ODP Hole 105-647A amphibole grains originated from different provinces of the North America. PANGAEA, https://doi.org/10.1594/PANGAEA.711292

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Abstract:
Many marine radiogenic isotope records show both spatial and temporal variations, reflecting both the degree of mixing of distinct sources in the oceans and changes in the distribution of chemical weathering on the continents. However, changes in weathering and transport processes may themselves affect the composition of radiogenic isotopes released into seawater. The provenance of physically weathered material in the Labrador Sea, constrained through the use of Ar-Ar ages of individual detrital minerals, has been used to estimate the relative contributions of chemically weathered terranes releasing radiogenic isotopes into the Labrador Sea. A simple box-model approach for balancing observed Nd-isotope variations has been used to constrain the relative importance of localised input in the Labrador Sea, and the subsequent mixing of Labrador Sea Water into North Atlantic Deep-Water. The long-term pattern of erosion and deep-water formation around the North Atlantic seems to have been a relatively stable feature since 1.5 Ma, although there has been a dramatic shift in the nature of physical and chemical weathering affecting the release of Hf and Pb isotopes. The modelled Nd isotopes imply a relative decrease in water mass advection into the Labrador Sea between 2.4 and 1.5 Ma, accompanied by a decrease in the rate of overturning, possibly caused by an increased freshwater input into the Labrador Sea.
Related to:
Reynolds, Ben C; Frank, Martin; Burton, Kevin W (2006): Constraining erosional input and deep-water formation in the North Atlantic using Nd isotopes. Chemical Geology, 226(3-4), 253-263, https://doi.org/10.1016/j.chemgeo.2005.09.023
Project(s):
Coverage:
Latitude: 53.331300 * Longitude: -45.262000
Date/Time Start: 1985-10-15T04:10:00 * Date/Time End: 1985-10-23T18:15:00
Minimum Elevation: -3869.0 m * Maximum Elevation: -3869.0 m
Event(s):
105-647A * Latitude: 53.331300 * Longitude: -45.262000 * Date/Time Start: 1985-10-15T04:10:00 * Date/Time End: 1985-10-23T18:15:00 * Elevation: -3869.0 m * Penetration: 736 m * Recovery: 444.6 m * Location: North Atlantic Ocean * Campaign: Leg105 * Basis: Joides Resolution * Device: Drilling/drill rig (DRILL) * Comment: 75 cores; 716.6 m cored; 0 m drilled; 62 % recovery
Parameter(s):
#NameShort NameUnitPrincipal InvestigatorMethodComment
1AGEAgeka BPGeocode
2Number of observationsNOBS#Reynolds, Ben CNumber of amphibole grains from young terrains. Age 0.0-0.6 Ga; e-Nd = + 6
3Number of observationsNOBS#Reynolds, Ben CNumber of amphibole grains from Grenville Province. Age 0.8-1.2 Ga; e-Nd = -20
4Number of observationsNOBS#Reynolds, Ben CNumber of amphibole grains from Nain Province. Age 1.2-1.6 Ga; e-Nd = -24
5Number of observationsNOBS#Reynolds, Ben CNumber of amphibole grains from Churchill Province. Age 1.6-2.1 Ga; e-Nd = -28
6Number of observationsNOBS#Reynolds, Ben CNumber of amphibole grains from Superior(?) Province. Age 2.1-2.5 Ga; e-Nd = -30
7Number of observationsNOBS#Reynolds, Ben CNumber of amphibole grains from Superior Province. Age >2.5 Ga; e-Nd = -30
8Number of observationsNOBS#Reynolds, Ben CTotal
9epsilon-Neodymium (0)e-Nd(0)Reynolds, Ben CEstimated input
10epsilon-Neodymium (0)e-Nd(0)Reynolds, Ben CEstimated input adjusted with lower value for Nain Province
Size:
64 data points

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