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Clarke, D B (1989): Chemical analyses of ODP Hole 105-647A basalts (Table 2). PANGAEA,, Supplement to: Clarke, DB (1989): Petrology and geochemistry of basalts from ODP Leg 105, Hole 647A, Labrador Sea and the Davis Strait area. In: Srivastava, SP; Arthur, M; Clement, B; et al. (eds.), Proceedings of the Ocean Drilling Program, Scientific Results, College Station, TX (Ocean Drilling Program), 105, 863-884,

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Basalt samples recovered from the lowermost 37 m of Leg 105 Hole 647A in the Labrador Sea are fine- to medium grained, have microphenocrysts of clinopyroxene, and show little evidence of alteration. Chemically, these rocks are low potassium (0.01-0.09 wt% K20), olivine- to quartz-normative tholeiites that are also depleted in other incompatible elements. In terms of many of the incompatible trace elements, the Labrador Sea samples are similar both to iV-type midocean ridge basalts (MORBs) and to the terrestrial Paleocene volcanic rocks in the Davis Strait region of Baffin Island and West Greenland. However, significant differences are found in their strontium and neodymium isotope systematics. Hole 647A samples are more depleted in epsilon-Nd (+9.3) and are anomalously rich in 87Sr/86Sr (0.7040) relative to the Davis Strait basalts (epsilon-Nd +2.54 to + 8.97; mean 87Sr/86Sr, 0.7034). We conclude that the Hole 647A and Davis Strait basalts may have been derived from a similar depleted mantle source composition. In addition, the Davis Strait magmas were generated from mantle of more than one composition. We also suggest that there is no geochemical evidence from the Hole 647A samples to support or to refute the existence of foundered continental crust in the Labrador Sea.
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
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
#NameShort NameUnitPrincipal InvestigatorMethodComment
1Sample code/labelSample labelClarke, D BODP sample designation
2Silicon dioxideSiO2%Clarke, D B
3Titanium dioxideTiO2%Clarke, D B
4Aluminium oxideAl2O3%Clarke, D B
5Iron oxide, Fe2O3Fe2O3%Clarke, D B
6Iron oxide, FeOFeO%Clarke, D B
7Manganese oxideMnO%Clarke, D B
8Magnesium oxideMgO%Clarke, D B
9Calcium oxideCaO%Clarke, D B
10Sodium oxideNa2O%Clarke, D B
11Potassium oxideK2O%Clarke, D B
12Phosphorus oxideP2O5%Clarke, D B
13Water in rockH2O%Clarke, D B
14SumSum%Clarke, D B
15QuartzQz%Clarke, D BCIPW Norm
16OrthoclaseOr%Clarke, D BCIPW Norm
17AlbiteAb%Clarke, D BCIPW Norm
18AnorthiteAn%Clarke, D BCIPW Norm
19DiopsideDi%Clarke, D BCIPW Norm
20HyperstheneHyp%Clarke, D BCIPW Norm
21OlivineOl%Clarke, D BCIPW Norm
22MontmorilloniteMnt%Clarke, D BCIPW Norm
23IlliteIll%Clarke, D BCIPW Norm
24ApatiteAp%Clarke, D B
25ScandiumScmg/kgClarke, D B
26VanadiumVmg/kgClarke, D B
27ChromiumCrmg/kgClarke, D B
28NickelNimg/kgClarke, D B
29CopperCumg/kgClarke, D B
30ZincZnmg/kgClarke, D B
31StrontiumSrmg/kgClarke, D B
32YttriumYmg/kgClarke, D B
33ZirconiumZrmg/kgClarke, D B
34GalliumGamg/kgClarke, D B
35BariumBamg/kgClarke, D B
36CaesiumCsmg/kgClarke, D B
37HafniumHfmg/kgClarke, D B
38TantalumTamg/kgClarke, D B
39ThoriumThmg/kgClarke, D B
40UraniumUmg/kgClarke, D B
41LanthanumLamg/kgClarke, D B
42CeriumCemg/kgClarke, D B
43NeodymiumNdmg/kgClarke, D B
44SamariumSmmg/kgClarke, D B
45EuropiumEumg/kgClarke, D B
46TerbiumTbmg/kgClarke, D B
47YtterbiumYbmg/kgClarke, D B
48LutetiumLumg/kgClarke, D B
49Strontium 87/Strontium 86 ratio87Sr/86SrClarke, D B
50epsilon-Neodymiume-NdClarke, D B
390 data points

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