A review of in situ carbon mineralization in basalt
Carbon mineralization process can be divided into three steps, including CO 2 dissolution and dissociation, silicate dissolution and carbonate precipitation. The dissolution and dissociation of CO 2 is a function of temperature, pressure and salinity (Mohammadian et al., 2023), while the dissolution and precipitation processes of …
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Rayleigh fractionation of iron isotopes during pedogenesis along …
1. Introduction. The weathering reactions of iron (Fe) intersect with many aspects of the biogeochemical functioning of soils (Crews et al., 1995, Torn et al., 1997, Darke and Walbridge, 2000, Miller et al., 2001, Küsel et al., 2002).Thermodynamic transformation of initially ferrous-bearing primary basalt minerals in oxic environments is …
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Iron isotope fractionation during leaching of granite and …
Iron fractionation by precipitation and/or adsorption in the oxalate systems. The pH of the oxalic acid solution was approximately. 2.2. On addition to the rock powders, the pH immediately rose to ...
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Dissolution and secondary mineral precipitation in basalts …
Aluminosilicates (clay or zeolite) also precipitated as secondary mineral phases. For our samples, rock dissolution mechanisms dominate secondary mineral precipitation, during the CO 2-water-rock reactions, thereby creating new pores. In addition, rock dissolution was found to affect the rigidity of the basalt samples negatively.
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Fractionation of iron and titanium isotopes by ilmenite and …
High-precision, non-traditional stable isotope analyses of lunar samples can provide new constraints to test hypotheses regarding the nature of mare basalt sources. Resolvable differences in iron, titanium, and magnesium isotopic compositions exist …
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The rates of dissolution of olivine, plagioclase, and quartz in …
The dissolution rates of spheres of two magnesian olivines, two plagioclases, and quartz in tholeiitic basalt have been determined at three super-liquidus temperatures and one-atmosphere pressure. There are considerable differences in the rates among the minerals, e.g. at 1210°, 12° above the liquidus temperature of the basalt, labradorite ...
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Dissolution of primary minerals of basalt in natural waters: I
The reduced products, which are rich in titanium oxycarbide, Ti 2 O 3 and iron, were prepared after reacting at 1550 °C for 3 h. The Fe content in the reduced …
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(PDF) An experimental study of crystalline basalt dissolution from …
(a) The crystalline basalt before dissolution experiments, (b) the basalt after it was dissolved in dissolution experiments at pH 10 at 25, 50, and 75 °C for total of 623 h.
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Effects of high-temperature treatment and iron reduction …
Continuous basalt fibers with diameters ranging from 9 μm to 11 μm could be produced by basalt with 0.83~4.64 wt% TiO2.The basalt with 6.44% TiO2 could not be prepared into continuous fiber ...
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Iron isotope fractionation during leaching of granite and basalt …
However, with basalt, the rate of change of Δ 56 Fe solution–rock early during the dissolution was greater compared to the granite. Although we have no data at 10 h, extrapolation of early and late trends suggests that isotopic values were stable in both hydrochloric and oxalic acid leachate solutions by ∼20 h ( Fig. 4 b), significantly ...
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Incongruent dissolution of silicates and its impact on the
The paper analyzes the process of incongruent dissolution of silicates taking place in close proximity to a talc mine. The chemical and phase composition as well as the concentrations and mobility ...
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The dissolution rates of naturally altered basalts at pH 3 and …
The findings of the present study suggest that the dissolution rates of altered basalts are approximately independent of their degree of alteration and that they …
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The rates of dissolution of olivine, plagioclase, and …
There are considerable differences in the rates among the minerals, e.g. at 1210 ~ 12 ~ above the liquidus temperature of the basalt, labradorite dissolves at 86 #m/h. and the magnesian olivines at 9 and 14/~m/h. The rates are not time dependent and this, coupled with the existence of concentration gradients in the composition of quenched melt ...
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Laboratory and field studies of colloidal iron oxide dissolution as
Protozoan-mediated dissolution of the same iron oxide phase proceeds at a rate ranging from 1–6% per day, depending on grazing turnover rates. Thus, while photolysis should dominate the redox cycling of refractory iron solids in near-surface waters under bright daytime conditions, phagotrophy is likely to be a more important process overall ...
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Chapter 6: Weathering and Soil Practice Flashcards | Quizlet
Study with Quizlet and memorize flashcards containing terms like Which of the following is/are most susceptible to chemical weathering by dissolution? A) quartz B) clay minerals C) iron oxides D) calcite, What two factors speed up rates of chemical reaction and weathering in rocks and soils? A) low temperatures; very dry B) low temperatures; very …
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Iron isotope fractionation during leaching of granite and basalt …
Semantic Scholar extracted view of "Iron isotope fractionation during leaching of granite and basalt by hydrochloric and oxalic acids" by J. Chapman et al. ... We studied stable iron isotope fractionation during dissolution of a biotite and chlorite enriched mineral fraction from granite by HCl and 5 mM oxalic acid in a pH range of 4-5.9.
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The geochemical evolution of basalt Enhanced Rock
The dissolution rate, r, of this glass can be estimated taking account of (Oelkers and Gislason, 2001, Gislason and Oelkers, 2003) (3) r = 1 A geo d m basalt dm water dm water dt where A geo corresponds to the total geometric surface area of basalt in the soil column, d m basalt dm water designates the mass of basalt dissolved into each ...
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FRACTIONATION OF IRON AND TITANIUM ISOTOPES BY …
produced low- and high-Ti mare basalt suites. Though ilmenite-bearing lunar magma ocean cumulates have often been invoked as the source of titanium enrichment in the lunar …
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Dissolution behaviour of model basalt fibres studied by …
The model fibres out of subalkaline rocks show dissolution kinetic, which is two-staged, whereas the more alkaline fibre reflects a linear one. The complex composition of basalt fibre is detected by EDX and XPS. The surface of basalt fibres is rich in Si and Al. XPS high resolution spectra provide information on oxidation state of iron.
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The release of iron-bearing minerals and dissolution of …
Dissolution of aluminosilicates and Fe-oxyhydroxide minerals from granitic eluvium using bacteria of Bacillus genus was monitored with solution chemistry, granulometric and X-ray analyses as well ...
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Sulfide oxidation and iron dissolution kinetics during the reaction …
1. Introduction. Iron is one of the few major elements to undergo extensive redox cycling in surface and near-surface environments. The iron present in the form of (oxyhydr)oxides represents an important component of rocks and soils, and accounts for approximately 2.1 wt.% of the oxidized sediments transported to lacustrine and marine …
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Dissolution and secondary mineral precipitation in basalts …
One of the leading hydrothermal alteration processes in volcanic environments is when rock-forming minerals with high concentrations of iron, magnesium, and calcium react with CO 2 and water to form carbonate minerals. This is used to the advantage of geologic sequestration of anthropogenic CO 2.Here we experimentally …
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Carbon mineralization and geological storage of CO2 in basalt
This rapid dissolution of Mg suggests that altered basalt is a promising feedstock for CO2 mineralization. This study provides theoretical support for developing technologies to utilize altered ...
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Leaching of ilmenite to produce titanium based materials: a …
The maximum dissolution of ilmenite was obtained on agitating ilmenite with HCl at a speed of 400 rpm for 300 min resulting in 96.37% and 92.87%, leaching of iron and titanium, respectively. The rate of dissolution could be controlled by two different mechanisms, mainly solid or product layer diffusion and chemical reaction.
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Basalt | Properties, Formation, Composition, Uses
Basalt is known for its dark color, typically ranging from black to dark gray, and its fine-grained texture. It is composed mostly of minerals such as pyroxene, plagioclase feldspar, and sometimes …
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Titanium-rich basaltic melts on the Moon modulated by …
Abstract. The origin of titanium-rich basaltic magmatism on the Moon remains enigmatic. Ilmenite-bearing cumulates in the lunar mantle are often credited as the source, but their partial melts are ...
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(PDF) Mechanisms of dissolution of iron oxides in aqueous …
The mechanism of dissolution of pure iron oxides by means of organic acids comprises two different chemical pathways: (a) non-reductive dissolution and (b) reductive dissolution. In this paper, the thermodynamic analysis of these pathways for the iron oxides-oxalic acid system is presented. In low acid solutions (pH higher than 3) the only ...
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Reactivity and Dissolution Characteristics of Naturally …
This study investigates the reactivity and dissolution behaviors of altered basalt during the reaction with CO 2 -rich fluids and compares it with unaltered basalt …
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Dissolution and secondary mineral precipitation in basalts …
The reactive mineral surface accessibility and flow intensity would also enhance, and even pos-. sibly control, the leaching rate in rocks when interacting with aqueous carbonic acid. Hydrogen ...
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Dissolution of primary minerals of basalt in natural waters: I
Dissolution reactions of primary minerals of basalt The dissolution reactions for primary minerals of basalt in aqueous solution used in the present study are given in Table 1. They have been expressed in terms of those aqueous species that were generally found to be dominant in natural waters in the basaltic terrain of Iceland (see …
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