The role of intragranular microtextures and microstructures in chemical and mechanical weathering: direct comparisons of experimentally and naturally weathered alkali feldspars

Lee, Martin; Hodson, Mark E.; Parsons, Ian

doi:10.1016/s0016-7037(98)00200-2

Cited by 97 publications

(65 citation statements)

References 25 publications

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“…Many authors have highlighted observations that natural weathering rates over thousands of years, or much longer duration, are very significantly slower than mineral reaction rates derived from experiments on unweathered material (Annbeek, 1992;Velbel 1993;Lee et al, 1998). White and Brantley (2003) showed experimentally that weathering rate in CO 2 rich waters decreases exponentially, as a power-law rate, with duration of weathering, for plagioclase and for other major rock-forming silicates.…”

Section: Predicted Mineral Reactionsmentioning

confidence: 99%

Natural Geochemical Analogues for Carbon Dioxide Storage in Deep Geological Porous Reservoirs, a United Kingdom Perspective

Haszeldine

Quinn

England

et al. 2005

Oil & Gas Science and Technology - Rev. IFP

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Résumé -Analogues géochimiques naturels pour le stockage du dioxyde de carbone en réservoir géologique poreux profond : perspective pour le Royaume-Uni -La concentration élevée en CO 2 atmosphérique participe au réchauffement climatique. Une mesure d'atténuation consiste à capter le CO 2 émis par les centrales électriques qui utilisent des combustibles fossiles, et à le stocker dans des aquifères salins ou dans des gisements exploités d'hydrocarbures. Des projets de démonstration déjà en cours et des analyses techniques indiquent que cette mesure est viable. Le CO 2 doit rester confiné pendant au moins 10 000 ans pour que cette option technologique ait un impact climatique. En vue de fournir une évaluation solide des performances d'un site de stockage, à l'échelle de temps indiquée, une approche possible est d'étudier les accumulations naturelles de CO 2 . Celles-ci sont en particulier capables de donner des informations sur les interactions roche-CO 2 -saumure à des échelles de temps comprises entre le millier et la dizaine de millions d'années. Les champs de CO 2 naturel en mer du Nord (Brae, Miller, Magnus), situés à 4 000 m d'enfouissement et plus, ne montrent pas la néoformation des phases minérales souvent prédite par la modélisation géochimique. La calcite et les feldspaths peuvent constituer encore entre 5 et 20 % des minéraux de la roche, tandis que la dawsonite n'est pas observée. Il en est de même pour des exemples de réservoirs de grès situés dans le sud-est australien et en Arizona. Il est possible qu'un état de déséquilibre thermodynamique se soit maintenu, de sorte que les modèles existants ne sont pas capables de prédire correctement les évolutions minéralogiques réelles, sur les durées pertinentes pour la séquestration du CO 2 . Ces modèles nécessitent une meilleure calibration. Les données expérimentales, à l'échéance de quelques mois, ou celles déduites des situations de récupération assistée (CO 2 -EOR), à l'échéance de quelques dizaines années, sont en général trop courtes pour offrir toutes les calibrations nécessaires. En revanche, les analogues naturels peuvent aider à combler cette lacune. Le plateau du Colorado abrite un tel système naturel, où des gisements estimés à 100 Gm 3 de CO 2 ont pu s'accumuler, à partir de sources vocaniques d'âge inférieur à 5 Ma.

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Section: Predicted Mineral Reactionsmentioning

confidence: 99%

Natural Geochemical Analogues for Carbon Dioxide Storage in Deep Geological Porous Reservoirs, a United Kingdom Perspective

Haszeldine

Quinn

England

et al. 2005

Oil & Gas Science and Technology - Rev. IFP

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“…For example, comparison of montmorillonite dissolution rates reported by Furrer et al (1993) and Zysset and Schindler (1996), or kaolinite dissolution rates reported by Wieland and Stumm (1992), Ganor et al (1995), and Cama et al (2002) reveal inconsistencies of an order of magnitude or more. Recently Lee et al (1998) concluded that field dissolution rates are strongly dependent on the weathering history and decrease with time. White and Brantley (2003) noted that granite dissolution rates decrease with time during long-term experiments and suggested decreasing reactive surface area as one possible explanation.…”

Section: Introductionmentioning

confidence: 99%

Do clay mineral dissolution rates reach steady state?

Köhler¹,

Bosbach²,

Oelkers³

2005

Geochimica et Cosmochimica Acta

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“…6b) and consequently the mineral dissolution rates. Table 2) while lab rates were taken from Holdren and Speyer (1987); Siegal and Pfannkuch (1984); Swoboda-Colberg and Drever (1993); Blum and Stillings (1995), Lee et al (1998): K-feldspar; Stillings et al (1996); Welch and Ullman (1996);Oxburgh et al (1994); Blum and Stillings (1995), Chou and Wollast (1985); Knauss and Wolrey (1986); Hamilton et al (2000): Albite; Brady and Walther (1990); Dove (1994): Quartz. The same field and laboratory rates are repeated for different parent materials (Granite, Basalt and Peridotite).…”

Section: Sensitivity Of Mineral Dissolution Rates To Physical Weatheringmentioning

confidence: 99%

Evaluating sensitivity of silicate mineral dissolution rates to physical weathering using a soil evolution model (SoilGen2.25)

Opolot

Finke

2015

Biogeosciences

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Abstract. Silicate mineral dissolution rates depend on the interaction of a number of factors categorized either as intrinsic (e.g. mineral surface area, mineral composition) or extrinsic (e.g. climate, hydrology, biological factors, physical weathering). Estimating the integrated effect of these factors on the silicate mineral dissolution rates therefore necessitates the use of fully mechanistic soil evolution models. This study applies a mechanistic soil evolution model (SoilGen) to explore the sensitivity of silicate mineral dissolution rates to the integrated effect of other soil-forming processes and factors. The SoilGen soil evolution model is a 1-D model developed to simulate the time-depth evolution of soil properties as a function of various soil-forming processes (e.g. water, heat and solute transport, chemical and physical weathering, clay migration, nutrient cycling, and bioturbation) driven by soil-forming factors (i.e., climate, organisms, relief, parent material). Results from this study show that although soil solution chemistry (pH) plays a dominant role in determining the silicate mineral dissolution rates, all processes that directly or indirectly influence the soil solution composition play an equally important role in driving silicate mineral dissolution rates. Model results demonstrated a decrease of silicate mineral dissolution rates with time, an obvious effect of texture and an indirect but substantial effect of physical weathering on silicate mineral dissolution rates. Results further indicated that clay migration and plant nutrient recycling processes influence the pH and thus the silicate mineral dissolution rates. Our silicate mineral dissolution rates results fall between field and laboratory rates but were rather high and more close to the laboratory rates possibly due to the assumption of far from equilibrium reaction used in our dissolution rate mechanism. There is therefore a need to include secondary mineral precipitation mechanism in our formulation. In addition, there is a need for a more detailed study that is specific to field sites with detailed measurements of silicate mineral dissolution rates, climate, hydrology, and mineralogy to enable the calibration and validation of the model. Nevertheless, this study is another important step to demonstrate the critical need to couple different soil-forming processes with chemical weathering in order to explain differences observed between laboratory and field measured silicate mineral dissolution rates.

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The role of intragranular microtextures and microstructures in chemical and mechanical weathering: direct comparisons of experimentally and naturally weathered alkali feldspars

Cited by 97 publications

References 25 publications

Natural Geochemical Analogues for Carbon Dioxide Storage in Deep Geological Porous Reservoirs, a United Kingdom Perspective

Natural Geochemical Analogues for Carbon Dioxide Storage in Deep Geological Porous Reservoirs, a United Kingdom Perspective

Do clay mineral dissolution rates reach steady state?

Evaluating sensitivity of silicate mineral dissolution rates to physical weathering using a soil evolution model (SoilGen2.25)

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