DOI: 10.1002/gbc.20082
Scopus记录号: 2-s2.0-84883734130
论文题名: Age dependence of mineral dissolution and precipitation rates
作者: Reeves D ; , Rothman D ; H
刊名: Global Biogeochemical Cycles
ISSN: 8866236
出版年: 2013
卷: 27, 期: 3 起始页码: 906
结束页码: 919
语种: 英语
英文关键词: aging
; dissolution
; kinetics
; precipitation
; weathering
Scopus关键词: Apparent rate constant
; Carbon sequestration
; Independent variables
; Isotopic composition
; Measurement procedures
; Mineral dissolution and precipitations
; Theoretical framework
; Transport limitations
; Aging of materials
; Enzyme kinetics
; Kinetics
; Mathematical models
; Porous materials
; Precipitation (chemical)
; Rate constants
; Sedimentology
; Sediments
; Weathering
; Dissolution
; aging
; carbon cycle
; carbon sequestration
; chemical weathering
; diagenesis
; dissolution
; isotopic composition
; numerical model
; precipitation (chemistry)
; reaction kinetics
; residence time
英文摘要: Understanding the rates of weathering, and more generally dissolution and precipitation in porous materials, is important for many applications including modeling the global carbon cycle and predicting short-term and long-term behavior in subsurface carbon sequestration sites. However, interpretation of the rates remains elusive as they have been observed to vary with location, measurement procedure, and time. We argue that the mechanisms responsible for the apparent aging in the rates, or gradual decrease over time, can be partially determined by noting which measure of time best characterizes the dependence. If the rate is best described as a function of residence time, then hydraulic and transport limitations are responsible for the variations. If reaction age is a better independent variable, then limitations in the chemical reaction at the fluid-mineral interface are responsible. We discuss several mechanisms in each category and construct mathematical models that demonstrate quantitatively how they affect time variation in reaction rates. These include nonlinear kinetics, disordered kinetics, and a reprecipitation model that accounts for the limited access to the bulk of a dissolving solid. We apply the reprecipitation model to the development of the isotopic composition of porous solids to derive an apparent rate constant that decays with inverse time, similar to that calculated for diagenesis in deep-sea sediments. This paper provides a theoretical framework for understanding the changing and varied dissolution and precipitation rates measured in the laboratory and in nature, and provides testable quantitative models that capture the aging effect. Key Points Age and residence time indicate transport and reaction limitations, respectivelyWe develop several mathematical models that predict observed dependenceA reprecipitation model is consistent with calculated sediment diagenesis rates ©2013. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/77576
Appears in Collections: 气候变化事实与影响
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作者单位: Lorenz Center, Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, United States
Recommended Citation:
Reeves D,, Rothman D,H. Age dependence of mineral dissolution and precipitation rates[J]. Global Biogeochemical Cycles,2013-01-01,27(3)