Impact of textural patterns on modeled rock weathering rates and size distribution of weathered grains

Israeli, Y.; Salhov, Eyal; Emmanuel, Simon

doi:10.1002/esp.5093

Cited by 7 publications

(3 citation statements)

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“…Similarly, an experimental study that tested the effects of heating and drying cycles on limestone cladding showed that stylolite-bearing rock was 3.5 times more susceptible to erosion than samples without stylolites (Aly et al 2018). Such enhanced weathering is likely to be the result of both physical and chemical processes: as well as representing planes of mechanical weakness (Simpson 2009;Baud et al 2016;Koehn et al 2016;Israeli et al 2021), stylolites can also serve as conduits for uid ow that facilitate chemical dissolution and the swelling of clay minerals and (Larbi 2003;Wangler et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Impact of stylolite cementation on weathering rates of carbonate rocks

Israeli,

Emmanuel

2023

Carbonates Evaporites

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The weathering of carbonate rocks plays a signi cant role in the evolution of Earth's surface. Such weathering is often accelerated by the presence of stylolites, which are rough, serated surfaces that form by dissolution under burial or tectonic stresses. Stylolites are thought to represent zones of mechanical weakness in rocks, as well as regions in which chemical weathering is enhanced. However, a quantitative framework capable of predicting how stylolites accelerate weathering in carbonates has yet to be achieved. In this study, we rst used scanning electron microscopy and wavelength dispersive spectroscopy to characterize the way in which the two sides of individual stylolites are connected at the microscopic scale. In the samples we examined, we found that micrometer-scale calcite bridges span the opposing sides of the stylolites, effectively cementing the rock together. This cement lled 1%-30% of the stylolite volume. We then used a numerical cellular automaton model to simulate the effect that the degree of carbonate cementation has on stylolitic carbonate rock weathering. Our results show that weathering rates decrease non-linearly as the degree of stylolite cementation increases. The effect on overall rock weathering rates is signi cant: stylolite-bearing rocks with 1% cementation weathered as much as 37 times faster than limestone without stylolites, primarily because of accelerated mechanical erosion. Our results indicate that stylolites could be as important as joints and fractures in accelerating carbonate rock weathering and in the development of karst landscapes, potentially making a major contribution to global carbonate weathering.

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Section: Introductionmentioning

confidence: 99%

Impact of stylolite cementation on weathering rates of carbonate rocks

Israeli,

Emmanuel

2023

Carbonates Evaporites

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“…Weathering of parent rock is an integral part of the Earth’s surface processes of soil formation and plays a critical role in maintaining terrestrial ecosystems ( Dixon et al, 2012 ; Zhu et al, 2013 ; Israeli et al, 2021 ), as well as controlling the long-term chemical composition of groundwaters, rivers, lakes, and oceans ( Duan et al, 2002 ; Godderis et al, 2009 ). The weathering of rocks has long been a research focus in geosciences, as it also plays a critical role in the global carbon cycle ( Li and Elderfield, 2013 ; Torres et al, 2016 ) and in regulating atmospheric CO 2 on geological time scales ( Them et al, 2017 ).…”

Section: Introductionmentioning

confidence: 99%

Effects of nitrogen fertilizers on the bacterial community diversity and the weathering of purple mudstone in Southwest China

Fan

Wang

et al. 2023

Front. Microbiol.

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IntroductionRock weathering is crucial in the development of soil. Yet the role of bacteria in the fine particle-forming process of purple mudstone is not fully understood, especially under nitrogen fertilization.MethodsIn this study, the particles (0.25 mm to 1 mm) of purple mudstone from Penglai Group (J3p) were selected as the test material. Two nitrogen fertilizers, i.e., urea (U) and ammonium bicarbonate (AB), and four application levels (0, 280, 560, and 840 N kg∙ha−1) with 18 replications were designed in an incubation experiment. The weathering indices and bacterial community structure of the purple mudstone particles were investigated after 120 days of incubation.ResultsThe results showed that the weathering indices of purple mudstone particles in the AB treatment were higher than that in the U treatment at the same fertilization levels and a reducing trend was observed with increasing nitrogen fertilizer levels under the same nitrogen fertilizer application types. The diversities of the bacterial community were extremely significantly altered by nitrogen fertilizer application (p < 0.01). The effect of the nitrogen fertilizer application level on the beta diversity of the bacterial community (R2 = 0.34) was greater than that of the nitrogen fertilizer application type (R2 = 0.20). Through stepwise regression analysis, the positive effects of nitrification of Nitrobacter (Nitrolancea) (R2 = 0.36), the Phosphorous-dissolving bacteria (Massilia) (R2 = 0.12), and N-NO3− (R2 = 0.35) on the weathering indices of J3p purple mudstone particles could be observed. Structural equation modelling indicated that nitrogen fertilizer application level affects the abundance of the dominant species at the genus level (Nitrolancea and Massilia), and key environmental factor (N-NO3−), which in turn accelerated the weathering indices (59%).Discussion and ConclusionOur findings imply that the enhancements of nitrification of Nitrobacter (Nitrolancea) and of phosphorus solubilization of Phosphorous-dissolving bacteria (Massilia) by nitrogen fertilization are the key factors affecting the weathering indices of J3p purple mudstone particles.

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Section: Introductionmentioning

confidence: 99%

Impact of stylolite cementation on weathering rates of carbonate rocks

Israeli

Emmanuel

2022

Preprint

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The weathering of carbonate rocks plays a significant role in the evolution of Earth’s surface. Such weathering is often accelerated by the presence of stylolites, which are rough, serated surfaces that form by dissolution under burial or tectonic stresses. Stylolites are thought to represent zones of mechanical weakness in rocks, as well as regions in which chemical weathering is enhanced. However, a quantitative framework capable of predicting how stylolites accelerate weathering in carbonates has yet to be achieved. In this study, we first used scanning electron microscopy and wavelength dispersive spectroscopy to characterize the way in which the two sides of individual stylolites are connected at the microscopic scale. In the samples we examined, we found that micrometer-scale calcite bridges span the opposing sides of the stylolites, effectively cementing the rock together. This cement filled 1%-30% of the stylolite volume. We then used a numerical cellular automaton model to simulate the effect that the degree of carbonate cementation has on stylolitic carbonate rock weathering. Our results show that weathering rates decrease non-linearly as the degree of stylolite cementation increases. The effect on overall rock weathering rates is significant: stylolite-bearing rocks with 1% cementation weathered as much as 37 times faster than limestone without stylolites, primarily because of accelerated mechanical erosion. Our results indicate that stylolites could be as important as joints and fractures in accelerating carbonate rock weathering and in the development of karst landscapes, potentially making a major contribution to global carbonate weathering.

show abstract

Impact of textural patterns on modeled rock weathering rates and size distribution of weathered grains

Cited by 7 publications

References 60 publications

Impact of stylolite cementation on weathering rates of carbonate rocks

Impact of stylolite cementation on weathering rates of carbonate rocks

Effects of nitrogen fertilizers on the bacterial community diversity and the weathering of purple mudstone in Southwest China

Impact of stylolite cementation on weathering rates of carbonate rocks

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