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Direct measurement of the combined effects of lichen, rainfall, and temperature onsilicate weathering

Geochimica et Cosmochimica Acta

By:
, , , , , and
DOI: 10.1016/S0016-7037(99)00251-3

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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.

Additional Publication Details

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