Mathematics – Logic
Scientific paper
Dec 1972
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972gecoa..36.1359d&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 36, Issue 12, pp.1359-1375
Mathematics
Logic
1
Scientific paper
Bulk sediment samples from two northern Alberta fresh water deltas and from the marine Mackenzie River delta were analysed for mineralogy and the trace elements B, Cu, Zn, Ni, Li and Mn. In both the marine and fresh water deltas the total clay content of the samples correlates highly with the trace elements studied. The concentration, of B and total clay in the bottom sediments from all three deltas increases with distance from the mouth of each delta (the increase is less well-defined for Cu, Zn, Ni, Li and Mn). The trace element variations in the two fresh water deltas result from variations in total clay content. If the two similar fresh water deltas were preserved in an ancient environment, they could be mistaken for a marine delta based solely on the boron content of the whole rock analyses as the boron content ranges are analogous to those reported for modern and ancient marine deltas. The slopes of regression lines, computed between the boron and total clay content of the fresh water and marine delta sediments are equal, which indicates that boron adsorption from sea water is not a significant factor in controlling the boron content of sediments in the marine Mackenzie River delta. Although the separation of the marine and fresh water regression Unes is statistically significant, discriminant function analysis shows that the mineralogical and chemical differences of the samples can be explained better by variations in the source area rather than by their occurrence in either the fresh water or marine deltas. The low water temperature of the Mackenzie River delta environment, and low silica content of the Mackenzie River, may be factors in the small boron increase in the marine delta for an alternative adsorption explanation. The boron content of shales and other fine-grained sediments may be useful to determine distance from a stand line, but its usefulness as an indicator of paleosalinity is questionable.
Bayliss P.
Dewis F. J.
Levinson A. A.
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