Weathering of Viamão granodiorite, South Brazil: Part 1 – Clay minerals formation and increase in total porosity

Bonnet, M.; Caner, Laurent; Siitari-Kauppi, Marja; Mazurier, Arnaud; Mexias, André Sampaio; Dani, Norberto; Sardini, Paul

doi:10.1016/j.geoderma.2022.115968

Cited by 2 publications

(12 citation statements)

References 46 publications

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“…The bulk density decreases from 2.66 kg dm − 3 in the un-weathered rock to 2.40 kg dm − 3 in the top of the saprolite. The quite high values of bulk densities measured for saprolite samples may be related to the fact that the analysed profile presents low chemical weathering intensity (Bonnet et al, 2022). The grain density remains similar in all the layers (2.68-2.71 kg dm − 3 ).…”

Section: Water Saturation/immersionmentioning

confidence: 90%

“…The un-weathered granodiorite has a mean total porosity of 1.73 % that falls in the typical range of porosity for fresh granitic rocks (Rossi and Graham, 2010;Mazurier et al 2016). The total porosity increases upward in the saprock from 3.57 % to 10.5 % due to an increase in physical fragmentation and chemical weathering (Bonnet et al, 2022). The increase is progressive with weathering of biotite and increases sharply with the weathering of feldspars.…”

Section: Water Saturation/immersionmentioning

confidence: 94%

“…Location, geological setting, and environmental conditions are described in Bonnet et al (2022). The weathering profile of an average thickness of 20 m is divided into four parts: the un-weathered rock, the saprock of ~2 m thickness with spheroidal weathering, a ~15 m thick saprolite and the soil of ~2 m thickness (Bonnet et al, 2022). The unweathered rock appears as large boulders of dark grey color in the bottom of the profile underlain by the granodiorite outcrops.…”

Section: Methodsmentioning

confidence: 99%

“…The soil, on the top of the weathering profile forms a 2 m thick and clay-rich layer with reddish-ochre colour which is due to the presence of iron oxy-hydroxides. More detailed description is given in Bonnet et al (2022).…”

Section: Methodsmentioning

confidence: 99%

“…These evolutions are complex to understand because they require the coupling between geochemistry, transport, and structural evolution of pore space with time (Putnis, 2002;2009;Jamtveit, 2009Jamtveit, , 2011. This contribution is the companion paper of Bonnet et al (2022). The present paper aims to characterize the transformation of the pore network of Viamão granodiorite (Rio Grande do Sul, Brazil) during weathering.…”

Section: Introductionmentioning

confidence: 99%

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Weathering of Viamão granodiorite, south Brazil: Part 2 – Initial porosity of un-weathered rock controls porosity development in the critical zone

et al. 2023

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Section: Water Saturation/immersionmentioning

confidence: 90%

Section: Water Saturation/immersionmentioning

confidence: 94%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Weathering of Viamão granodiorite, south Brazil: Part 2 – Initial porosity of un-weathered rock controls porosity development in the critical zone

et al. 2023

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Characteristics and Influencing Factors of the Granite Weathering Profile: A Case Study of a High Latitude Area in Northeastern China

Liu,

Chi,

Xie

et al. 2023

Minerals

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Rock weathering, an important geological process on the earth’s surface, plays a key role in shaping surface morphology, providing nutrients needed by the ecosystem, and regulating the global climate. However, the regimes for controlling rock weathering in different regions are still controversial. In this respect, the heavy minerals, elements, Sr-Nd isotope, magnetic susceptibility, and chromaticity of the granite weathering profile in Harbin, a high latitude area of China, were analyzed for understanding the weathering characteristics and mechanisms of the granite weathering profile in the cold area. The results indicate that the profile underwent strengthened physical weathering (large volumes of cracks in the granite parent rock) and low–moderate chemical weathering (CIA = 56~68). However, the chemical weathering does not clearly affect the composition of the weathering products, making the weathering products a good inheritance from the parent rocks, as evidenced by the binary diagram (e.g., TiO2-Zr, and La/Sc-Co/Th) and geochemical genes (LG01 and LG03). The development process of the weathering profile has been affected by the input of external materials and biological activities, as evidenced by the Sr-Nd isotopic composition, Th/Zr values, chemical depletion fractions, ΔAl/Ti ratios, χfd%, and geochemical genes (LG03). Notably, a progressively decreasing weathering degree with a reduced depth is observed in the profile, which is likely to be related to an addition of external materials and/or effects of biological activities. In addition, the weathering regime of the profile does not vary in geology time, characterized by a kinetic-limited weathering regime with a limited supply.

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Weathering of Viamão granodiorite, South Brazil: Part 1 – Clay minerals formation and increase in total porosity

Cited by 2 publications

References 46 publications

Weathering of Viamão granodiorite, south Brazil: Part 2 – Initial porosity of un-weathered rock controls porosity development in the critical zone

Weathering of Viamão granodiorite, south Brazil: Part 2 – Initial porosity of un-weathered rock controls porosity development in the critical zone

Characteristics and Influencing Factors of the Granite Weathering Profile: A Case Study of a High Latitude Area in Northeastern China

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