Eolian dust

At this point, nothing is known about Cu and Zn isotopic variability in seawater. Zn is very depleted in surface waters because it behaves as a nutrient. A substantial amormt of Zn isotope data is available for sediments. Marechal et al. (2000) found that the 5 Zn values of clay minerals from different environments (Paleozoic shales, including a black shale, Mediterranean sapropels. Pacific and Atlantic sediments, a eolian dust) fall within a narrow range (0.17-0.35%o) centered around the magmatic values and therefore reflect the Zn isotope composition... 

Simoneit BRT, Organic matter in eolian dusts over the Atlantic Ocean, Mar Chem 5 443-464, 1977. 

Jahn B. M., Gallet S., and Han J. M. (2001) Geochemistry of the Xining, Xifeng, and Jixian sections. Loess Plateau of China eolian dust provenance and paleosol evolution during the last 140 ka. Chem. Geol. 178(1-4), 71-94. 

Brimhall G. H., Lewis C. J., Ague J. J., Dietrich W. E., Hampel J., Teague T., and Rix P. (1988) Metal enrichment in bauxite by deposition of chemically-mature eolian dust. Nature 333, 819-824. 

It must be stressed that although the trend observed in the coastal zone of the Ross Sea was not so marked and regular as the results of Saager et al., the effect of local phenomena can be assumed. In fact, glacier transport and the ice pack formation/dissolution cycle can play a fundamental role in the composition of surface coastal sea water. However, more detailed information about the local sources (eolian dust composition and deposition rate, glacier composition and dissolution rate, effect of pack ice dissolution and formation) are necessary to establish the origin of the surface water enrichment. 

The share of eolian dust transport in continental erosion is submerged in the greater range of uncertainties associated with the transport rates, as discussed in the preceding paragraphs. 

Rea, D. K., S. A. Hovan, and T. R. Janecek (in press), Late Quaternary Flux of Eolian Dust to the Pelagic Ocean, NRC Studies in Geophysics, National Academy of Sciences, Washington, DC. 

Chester, R., Baxter, G.G., Behairy, A.K.A., Connor, K., Cross, D., Elderfield, H. and Padgham, R.C. (1977) Soil-sized eolian dusts from the lower troposphere of the eastern Mediterranean Sea. Marine Geology, 24, 201-217. 

Simoneit, B. R. T. (1977). Organic matter in eolian dust over the Atlantic ocean. Mar. Chem. 5, 443-464. 

Fig. 1.3 The world s major desert areas and semi-arid regions and potential long-distance eolian dust trajectories and oceanic depocenters (Hillier 1995).

Red clays are mainly allogenic in origin (Glasby 1991). In the Pacific, this allogenic component is dominantly eolian dust. The high input of dust from... 

Table 11.2 Rates of deposition ( lg cm lO yr ) of transition elements from eolian dust and organic aggregates and into red clays (after Glasby 1991).

Simoneit, B.R.T. and Eglinton, G., 1977. Organic matter of eolian dust and its input to marine sediments. In R. Campos and J. Goni (Editors), Advances in Organic Geochemistry, 1975. Enadimsa, Madrid, pp. 415—430. 

Fine eolian dust carried over the ocean and precipitated by rain (60, 61) may also adsorb mercury from the atmosphere. Pelagic organisms may account for the agglomeration of the fine suspended matter in the ocean (3, 62), and thus the mercury generated over continents can be transferred to the midocean (63). Dissolved mercury in the oceans can be concentrated by phytoplankton (64), thus ofiFering another route for the removal and sedimentation of mercury in the midocean. As a result of this removal oceanic surface waters are depleted in this element (3, 65, 66) relative to deeper strata, and sediments are accordingly enriched. 

Merino, E., Banerjee, A. (2008). Terra rosa genesis, imphcations for karst, and eolian dust A geodynamic thread. Journal of Geology, 116, 62-75. 

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