Relation between soil age and silicate weathering rates determined from the chemical evolution of a glacial chronosequence: comment

Article Abstract:

Taylor and Blum presented a model for measuring the change in weathering rates between glacial and nonglacial periods. Based on this model, they conclude that no significant amount of eolian material was added to soils. There was also no lateral transport and erosion of soils. However, their model cannot account for weathering in the Wind River Range from data gathered on dust influx, profile erosion and acid deposition. Soil weathering in the area is complex mainly because the soils cannot be treated as closed systems. More data are needed to ascertain the extent of weathering.

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Reply

Article Abstract:

Determining silicate weathering rates is crucial in studying global CO2 cycle in different geological eras. Soil profile studies give the most accurate estimates of long-term weathering if the sites studied are correctly chosen. The sites chosen to be studied prevented mistakes usually committed in soil profile studies to materialize. Even if the data gathered are evaluated against points raised by D.E. Dahms and his associates, they do not significantly alter the estimates of soil weathering.

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Apatite weathering and the Paherozoic phosphorus cycle

Article Abstract:

Activation energy and apatite surface area are important when controlling the phosphorus flux from marine net ecosystem production in geologic time. This conclusion was derived through a kinetic treatment of existing data used in a weathering model.

Hawaii, Apatite, Apatites

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