Direct Measurement of the Combined Effects of Lichen, Rainfall, and Temperature On silicate Weathering

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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 ... continued below

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8 p.

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BRADY,PATRICK V.; DORN,RONALD I.; BRAZEL,ANTHONY J.; CLARK,JAMES; MOORE,RICHARD B. & GLIDEWELL,TIFFANY July 14, 2000.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by UNT Libraries Government Documents Department to Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 39 times . More information about this article can be viewed below.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA (United States)
    Place of Publication: Albuquerque, New Mexico

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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.

Physical Description

8 p.

Notes

OSTI as DE00759989

Medium: P; Size: 8 pages

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  • Journal Name: Geochimica et Cosmochimica Acta; Journal Volume: 63; Journal Issue: 19/20; Other Information: Pages 3293-3300

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  • Report No.: SAND2000-1903J
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 759989
  • Archival Resource Key: ark:/67531/metadc703021

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  • July 14, 2000

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 11, 2017, 6:35 p.m.

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BRADY,PATRICK V.; DORN,RONALD I.; BRAZEL,ANTHONY J.; CLARK,JAMES; MOORE,RICHARD B. & GLIDEWELL,TIFFANY. Direct Measurement of the Combined Effects of Lichen, Rainfall, and Temperature On silicate Weathering, article, July 14, 2000; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc703021/: accessed October 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.