Direct measurement of the combined effects of lichen, rainfall, and temperature onsilicate weathering
Geochimica et Cosmochimica Acta
By: P.V. Brady, R.I. Dorn, A.J. Brazel, J. Clark, R. B. Moore, and T. Glidewell
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Abstract
A key uncertainty in models of the global carbonate-silicate cycle and long-term climate is the way that silicates weather under different climatologic conditions, and in the presence or absence of organic activity. Digital imaging of basalts in Hawaii resolves the coupling between temperature, rainfall, and weathering in the presence and absence of lichens. Activation energies for abiotic dissolution of plagioclase (23.1 ?? 2.5 kcal/mol) and olivine (21.3 ?? 2.7 kcal/mol) are similar to those measured in the laboratory, and are roughly double those measured from samples taken underneath lichen. Abiotic weathering rates appear to be proportional to rainfall. Dissolution of plagioclase and olivine underneath lichen is far more sensitive to rainfall.
Suggested Citation
Brady, P., Dorn, R., Brazel, A., Clark, J., Moore, R.B., Glidewell, T., 1999, Direct measurement of the combined effects of lichen, rainfall, and temperature onsilicate weathering: Geochimica et Cosmochimica Acta, v. 63, no. 19-20, p. 3293-3300, https://doi.org/10.1016/S0016-7037(99)00251-3.
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Direct measurement of the combined effects of lichen, rainfall, and temperature onsilicate weathering |
| Series title | Geochimica et Cosmochimica Acta |
| DOI | 10.1016/S0016-7037(99)00251-3 |
| Volume | 63 |
| Issue | 19-20 |
| Year Published | 1999 |
| Language | English |
| Larger Work Type | Article |
| Larger Work Subtype | Journal Article |
| Larger Work Title | Geochimica et Cosmochimica Acta |
| First page | 3293 |
| Last page | 3300 |