Geochemical balance

Kastner, M. (1974). The contribution of authigenic feldspars to the geochemical balance of alkalic metals. Geochim. Cosmochim. Acta 38, 650-653. 

Geochemical balance of arsenic in ocean and subduction flux (g/year) (Shikazono, 1993)... 

The geochemical balance of As in ocean and subduction flux of As are summarized in Table 3.6. 

Shikazono, N. (1993) Influence of hydrothermal flux on arsenic geochemical balance of seawater. Chikyuka-gakii (Geochemistry), 27. 135-139 (in Japanese). 

Table 16.3 Geochemical Balance of Dissolved Silicon in the Modern Ocean. ...

Bertram, C.J. and Elderfield, H. (1993) The geochemical balance of the rare earth elements and neodymium isotopes in the oceans. Geochim. Cosmochim.Acta, 57, 1957-1986. 

Horn, M. K., Adams, J. A. S. (1966) Computer-derived geochemical balances and element abundances. Geochim. Cosmochim. Acta, 30, 279-97. 

Brotzen, O. The average igneous rock and the geochemical balance. Geochim. et Cosmochim. Acta 30, 863-868 (1966). 

The geochemical balance of carbon changed dramatically during Devonian and Carboniferous times. At those times the main evolutionary radiation of terrestrial vascular plants occurred. These events flowed from the development of various parts of higher plants, such as roots, stems, leaves, and reproductive apparatus enabling the colonization of a new ecological niche. This colonization and accumulation of... 

Oxides and hydroxides of Fe and Mn are ordinary components of black soils, but their impact on the behaviour of microelements is very important. These compounds can absorb microelements, because they form membranes in soil (Kabata-Pendias et al., 2003). High content of Fe and Mn oxides and hydroxides in soil may lead to significant changes in the geochemical balance. However, the environmental impacts are not equally distributed over the territory. It is a well-known fact, that impacts in certain industrial areas are higher than in others. Table 3 shows the concentrations of 15 elements in urban soils. 

The geochemical balance of a 103 acre watershed underlain by silicate bedrock was investigated. Base flow composition of the stream water was essentially constanty but flood flows showed a decrease in concentration of silica, bicarbonate, and sodium and an increase in sulfate, magnesium, calcium, and potassium. Laboratory experiments indicate that fresh rock or soil reacts rapidly with distilled water and achieves a composition similar to the stream water, suggesting control of water composition by reaction with the silicate minerals. The aluminosilicate minerals react with CO charged water to form kaolinite, releasing cations and silica to solution. The products of weathering are removed as particulate matter (0,28 metric tons per year) and dissolved material (1,5 metric tons per year). 

To assess the behavior of some common silicate minerals in the weathering environment and the eflFect of water-silicate reactions on both the minerals and the resulting solution composition, we investigated the geochemical balance of a small wooded watershed underlain by silicate bedrock. 

This work, although a modest beginning in our eflFort to understand the geochemical balance of a small watershed, permits us to draw some tentative conclusions ... 

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