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

Patrick V. Brady, Ronald Dorn, Anthony J. Brazel, James Clark, Richard B. Moore, Tiffany Glidewell

Research output: Contribution to journalArticle

75 Citations (Scopus)

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.

Original languageEnglish (US)
Pages (from-to)3293-3300
Number of pages8
JournalGeochimica et Cosmochimica Acta
Volume63
Issue number19-20
DOIs
StatePublished - Oct 1999

Fingerprint

Weathering
lichen
Rain
Silicates
weathering
rainfall
plagioclase
olivine
Dissolution
silicate
dissolution
weathering rate
temperature
Carbonates
activation energy
Temperature
Activation energy
basalt
weather
Imaging techniques

ASJC Scopus subject areas

  • Geochemistry and Petrology

Cite this

Direct measurement of the combined effects of lichen, rainfall, and temperature onsilicate weathering. / Brady, Patrick V.; Dorn, Ronald; Brazel, Anthony J.; Clark, James; Moore, Richard B.; Glidewell, Tiffany.

In: Geochimica et Cosmochimica Acta, Vol. 63, No. 19-20, 10.1999, p. 3293-3300.

Research output: Contribution to journalArticle

Brady, Patrick V. ; Dorn, Ronald ; Brazel, Anthony J. ; Clark, James ; Moore, Richard B. ; Glidewell, Tiffany. / Direct measurement of the combined effects of lichen, rainfall, and temperature onsilicate weathering. In: Geochimica et Cosmochimica Acta. 1999 ; Vol. 63, No. 19-20. pp. 3293-3300.
@article{39ef47be89ec4ef0b4f80607a5d4f351,
title = "Direct measurement of the combined effects of lichen, rainfall, and temperature onsilicate weathering",
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.",
author = "Brady, {Patrick V.} and Ronald Dorn and Brazel, {Anthony J.} and James Clark and Moore, {Richard B.} and Tiffany Glidewell",
year = "1999",
month = "10",
doi = "10.1016/S0016-7037(99)00251-3",
language = "English (US)",
volume = "63",
pages = "3293--3300",
journal = "Geochmica et Cosmochimica Acta",
issn = "0016-7037",
publisher = "Elsevier Limited",
number = "19-20",

}

TY - JOUR

T1 - Direct measurement of the combined effects of lichen, rainfall, and temperature onsilicate weathering

AU - Brady, Patrick V.

AU - Dorn, Ronald

AU - Brazel, Anthony J.

AU - Clark, James

AU - Moore, Richard B.

AU - Glidewell, Tiffany

PY - 1999/10

Y1 - 1999/10

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=0033391746&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0033391746&partnerID=8YFLogxK

U2 - 10.1016/S0016-7037(99)00251-3

DO - 10.1016/S0016-7037(99)00251-3

M3 - Article

VL - 63

SP - 3293

EP - 3300

JO - Geochmica et Cosmochimica Acta

JF - Geochmica et Cosmochimica Acta

SN - 0016-7037

IS - 19-20

ER -