25 research outputs found
(Table 4) Concentrations of major-element oxides and minor and trace elements at DSDP Site 87-584
(Table 1 - 2) Lithologic description, total carbonate and iron contents for Mössbauer measurements at DSDP Hole 95-612
Concentrations of major-element oxides and minor and trace elements at DSDP Legs 87, 57, 56 and 31
Sediments from Sites 582 (11 samples), 583 (19 samples), 584 (31 samples), 294 (1 sample), 296 (9 samples), 297 (3 samples), 436 (11 samples), and 439 (3 samples) were analyzed by X-ray fluorescence and/or instrumental neutron activation analysis. Ten major elements and 24 minor and trace elements (including 7 rare earth elements) were determined with these methods. Geochemistry varies systematically with both the site location and sediment age. Such variations are explained in terms of changes in sedimentation processes caused by plate motion and changes in ocean currents
(Table 2) Concentrations of major-element oxides and minor and trace elements at DSDP Sites 87-582 and 87-583
(Table 3) Concentrations of major-element oxides and minor and trace elements at DSDP Leg 31 Holes
Mössbauer study at DSDP Hole 95-612
57Fe Mössbauer spectra of 15 oceanic sediment samples collected from Site 612 (Deep Sea Drilling Project Leg 95) were recorded. These spectra showed that most of the iron in the sediments was present as high-spin, paramagnetic Fe2+ and Fe3+. The ferrous iron was mainly distributed in terrigenous clays and biogenic carbonates. The variation of the Mössbauer parameters for Fe2+ with sub-bottom depth suggests that the main Fe2+-bearing component changed with geologic time. The amount of iron in each iron-bearing phase as estimated from the corresponding peak areas in the spectra also changed with depth. These variations in the Mössbauer parameters and peak areas are correlated with lithologic changes in the sediment column