The influence of pH on biotite dissolution and alteration kinetics at low temperature

Acker, James G.; Bricker, Owen P.

doi:10.1016/0016-7037(92)90290-y

Cited by 188 publications

(126 citation statements)

References 34 publications

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“…Nanometre scale observations carried out on mica surfaces indicate that the density of etch pits decreases when pH increases from 1.1 to 5.7. This shows that as pH increases, the available reactive surface decreases confirming previous studies where it was postulated that mica dissolution depends on H + activity (Bales and Morgan, 1985;Carrol-Webb and Walther, 1988;Acker and Bricker, 1992;Casey et al, 1993;Kalinowski and Schweda, 1996;Oelkers et al, 2008). According to the Transition State Theory, when a mica crystal is in contact with solutions, H + may exchange with K + to form an activated complex with surface cations leading to polarisation and instability of cationic bonds with the mineral surface (Stumm and Wollast, 1990).…”

Section: Discussionsupporting

confidence: 73%

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Influence of pH and temperature on the early stage of mica alteration

Pachana¹,

Zuddas²,

Censi³

2012

Applied Geochemistry

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a b s t r a c tMineral dissolution and precipitation reactions actively participate in controlling fluid chemistry during water-rock interaction. In this study, the changes in the biotite and muscovite basal surface nano-morphology were evaluated during interaction with fluids of different pH (pH = 1.1, 3.3 and 5.7) at different temperatures (T = 25°, 120°, and 200°C). Results show that at the nanometre scale resolution of the atomic force microscope (AFM), dissolution generates etch pits with a stair-shaped pattern over the (0 0 1) surface. The flux of dissolved elements decreases when pH increases. However, at pH 5.7, a change was found in the flux after 42 h of reaction when abundant gibbsite and kaolinite coat the dissolving mineral surface. This phenomenon was widely observed at edges of the etch pits by AFM. It was also found that an increase in temperature produces an enhancement in the elemental flux in both micas. Dissolution regime changes after less than one day of interaction at high temperature because of abundant coating formation over the etch pits and edges. The results demonstrate the key role of nanometre size neogenic phases in the control of elemental flux from mica surfaces to solution. The formation of nanometre size coatings, blocking the sites active for dissolution, appears to control the alteration of phyllosilicates even at the early stage of the interaction.

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Section: Discussionsupporting

confidence: 73%

“…Since the K flux may depend on exchange reactions with solution H + , the K flux was not estimated (Acker and Bricker, 1992).…”

Section: Estimation Of the Cation Fluxmentioning

confidence: 99%

Influence of pH and temperature on the early stage of mica alteration

Pachana¹,

Zuddas²,

Censi³

2012

Applied Geochemistry

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“…and increase thereafter with increasing pH (Lin and Clemency, 1981a;Lin and Clemency, 1981b;Acker and Bricker, 1992;Turpault and Trotignon, 1994;Kalinowski and Schweda, 1996;Malmstr m et al, 1996;Malmstr m and Banwart, 1997;Brandt et al, 2003;Balogh-Brunstad et al, 2008;Balland et al, 2010;Haward et al 2011;Cappelli et al, 2013;Voinot et al, 2013). As the pH of minimum biotite dissolution rate (~ pH 7) differs from both pH IEP (3.02) and pH imm (9.66), it is clear that the biotite dissolution rates are not directly related to proton consumption at the surface.…”

Section: Implications Of Biotite Surface Chemistry For Dissolution Kimentioning

confidence: 99%

Biotite surface chemistry as a function of aqueous fluid composition

Bray

Benning

Bonneville

et al. 2014

Geochimica et Cosmochimica Acta

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“…The relatively smaller and the average weathering advance rate, ω, of 43 m Ma -1 (Brown et al, 1995). Other parameters used are φ = 0.095 g g -1 ; specific BET surface area for fresh biotite, s = 0.1 m 2 g -1 (Acker and Bricker, 1992); and β = 0.36 mol Fe(II) mol -1 , which is the stoichiometric coefficient of Fe(II) oxidation ( Table 4). The resulting rate of biotite oxidation within the rindlet sequence is 8.2 x 10 -14 mol m -2 s -1 , or log R = -13.1.…”

Section: Biotite Weatheringmentioning

confidence: 99%