Chemical analyses of ODP Hole 105-647A basalts (Table 2) ...

• Main Author: Clarke, D B
• Format: Dataset
• Language: English
• Published: PANGAEA 1989
• Subjects: Sample code/label; Silicon dioxide; Titanium dioxide; Aluminium oxide; Iron oxide, Fe2O3; Iron oxide, FeO; Manganese oxide; Magnesium oxide; Calcium oxide; Sodium oxide; Potassium oxide; Phosphorus pentoxide; Water in rock; Sum; Quartz; Orthoclase; Albite; Anorthite; Diopside; Hypersthene; Olivine; Montmorillonite; Illite; Apatite; Scandium; Vanadium; Chromium; Nickel; Copper; Zinc; Strontium; Yttrium; Zirconium; Gallium; Barium; Caesium; Hafnium; Tantalum; Thorium; Uranium; Lanthanum; Cerium; Neodymium; Samarium; Europium; Terbium; Ytterbium; Lutetium; Strontium-87/Strontium-86 ratio; ε-Neodymium; Baffin Island; Greenland; Baffin; Davis Strait; Labrador Sea
• Online Access: https://dx.doi.org/10.1594/pangaea.745267; https://doi.pangaea.de/10.1594/PANGAEA.745267

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 ... : Supplement to: Clarke, D B (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 ...