Rapid analysis of silicate, carbonate, and phosphate rocks: Revised edition

Shapiro, Leonard

doi:10.3133/b1401

1975

DOI: 10.3133/b1401

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Rapid analysis of silicate, carbonate, and phosphate rocks: Revised edition

Leonard Shapiro¹

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Cited by 53 publications

References 19 publications

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The role of rock weathering in the phosphorus budget of terrestrial watersheds

Gardner

1990

Biogeochemistry

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Abstract.Residual soils (saprolites) developed on crystalline rocks appear to form by an essentially isovolumetric process (i.e. without dilation or compaction). Isovolumetric geochemical analysis of a suite of saprolite samples developed on a common parent rock can be used to estimate the relative rates of long-term losses of P and Si during weathering. Using the export of dissolved Si in rivers as a weathering index, one can then estimate the rate of P release due to chemical weathering by means of the P-Si loss ratio in saprolite. For three basins where data are available (Liberty Hill, SC; Amazon River, Brazil: Rio Negro, Brazil) estimated P weathering release rates are 163,457, and 242molesP km-' yr-', respectively. These compare to precipitation inputs of 684, 700 and 630 moles P km-* yr-' and total river exports of 256,449O and 820 moles P km-' yr-', respectively. The Rio Negro shows a near perfect balance between the input of P via precipitation and chemical weathering and the riverine output of dissolved and suspended P. This system, however, raised the unsolved problem of the source that supports the atmospheric P input.

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The role of rock weathering in the phosphorus budget of terrestrial watersheds

Gardner

1990

Biogeochemistry

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Geochemical factors controlling the chemical nature of water and sediments in the Gomti River, India

Gupta

Subramanian

1998

Environmental Geology

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Stable isotopes in the sulfate evaporites from southeastern Iowa, U.S.A.: Indications of postdepositional change

Richardson

Hansen²

1991

Chemical Geology

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Rapid analysis of silicate, carbonate, and phosphate rocks: Revised edition

Cited by 53 publications

References 19 publications

The role of rock weathering in the phosphorus budget of terrestrial watersheds

The role of rock weathering in the phosphorus budget of terrestrial watersheds

Geochemical factors controlling the chemical nature of water and sediments in the Gomti River, India

Stable isotopes in the sulfate evaporites from southeastern Iowa, U.S.A.: Indications of postdepositional change

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