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Статті в журналах з теми "Carbonate weathering"

Автор: Grafiati

Опубліковано: 25 травня 2024

Оновлено: 31 липня 2025

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1

Huang, Kang-Jun, Fang-Zhen Teng, Bing Shen, et al. "Episode of intense chemical weathering during the termination of the 635 Ma Marinoan glaciation." Proceedings of the National Academy of Sciences 113, no. 52 (2016): 14904–9. http://dx.doi.org/10.1073/pnas.1607712113.

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Cryogenian (∼720–635 Ma) global glaciations (the snowball Earth) represent the most extreme ice ages in Earth’s history. The termination of these snowball Earth glaciations is marked by the global precipitation of cap carbonates, which are interpreted to have been driven by intense chemical weathering on continents. However, direct geochemical evidence for the intense chemical weathering in the aftermath of snowball glaciations is lacking. Here, we report Mg isotopic data from the terminal Cryogenian or Marinoan-age Nantuo Formation and the overlying cap carbonate of the basal Doushantuo Forma

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2

Ott, Richard, Sean F. Gallen, and David Helman. "Erosion and weathering in carbonate regions reveal climatic and tectonic drivers of carbonate landscape evolution." Earth Surface Dynamics 11, no. 2 (2023): 247–57. http://dx.doi.org/10.5194/esurf-11-247-2023.

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Abstract. Carbonate rocks are highly reactive and can have higher ratios of chemical weathering to total denudation relative to most other rock types. Their chemical reactivity affects the first-order morphology of carbonate-dominated landscapes and their climate sensitivity to weathering. However, there have been few efforts to quantify the partitioning of denudation into mechanical erosion and chemical weathering in carbonate landscapes such that their sensitivity to changing climatic and tectonic conditions remains elusive. Here, we compile bedrock and catchment-averaged cosmogenic calcite–

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3

Tao, Gang, Rui Liu, Peng Zhang, Yaqin Wang, Lei Zuo, and Xiaoheng Zhang. "Carbonate Nanoparticles Formed by Water–Rock Reactions in Groundwater: Implication of Carbonate Rock Weathering in Carbonate Aquifers." Minerals 14, no. 10 (2024): 980. http://dx.doi.org/10.3390/min14100980.

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Carbonate rocks are highly reactive and exhibit higher ratios of chemical weathering compared to most other rock types. A chemo-mechanical mechanism, which is particularly effective in groundwater due to higher ion concentrations, is common in fine-grained carbonates at the nanoscale. As a result, the weathering of carbonate aquifers produces a substantial number of carbonate nanoparticles (CNPs). In this study, we utilized high-resolution transmission electron microscopy (HRTEM) to analyze CNPs formed by water–rock reactions in two types of groundwater from Shandong Province, China. Our findi

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4

Wu, Huaying, Zhongcheng Jiang, Qibo Huang, et al. "Geochemistry of Weathering Cover and the Main Influencing Factors in Karst Area of Guilin, Southwest China." Water 15, no. 16 (2023): 2944. http://dx.doi.org/10.3390/w15162944.

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The chemical weathering of carbonate rocks is the main form of interaction between earth spheres in the karst critical zone. The karst weathering cover, which is composed by residua from carbonate rocks weathering, contains important information about the climate environment and material cycle. We present the chemical composition of weathering covers in karst area of Guilin, Guangxi province, analyze their weathering process and strength, and compare them with the other weathering covers in other karst area in China, including Yunnan, Guizhou, Hunan, and Qinghai Tibet Plateau. The results show

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5

Jorge Pinto, André, Nuria Sánchez-Pastor, and Angeles Fernández-González. "The Controlling Effect of CaCO3 Supersaturation over Zn Carbonate Assemblages: Co-Crystallization in Silica Hydrogel." Minerals 14, no. 12 (2024): 1274. https://doi.org/10.3390/min14121274.

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Weathering products of sphalerite-bearing ores play an important role in controlling the fate of Zn in the environment. In this framework, the relative stability of Zn carbonates is of special relevance for the common case of ore weathering by carbonated groundwater in the presence of calcium carbonates. We investigated the experimental (co)nucleation and growth of Zn and Ca carbonates at 25 °C in finite double diffusion silica hydrogel media with the purpose of deciphering the system’s reactive pathway and unraveling the major governing factors behind the obtained mineral assemblages. The cry

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6

Chen, Wenwen, Huanfang Huang, Haixiang Li, et al. "Coupled nitrogen transformation and carbon sink in the karst aquatic system: a review." Blue-Green Systems 3, no. 1 (2021): 201–12. http://dx.doi.org/10.2166/bgs.2021.120.

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Abstract Carbonate bedrock regions represent that 14% of Earth's continental surface and carbon (C) sink in karst water plays an important role in the global C cycle due to the CO2 consumption during carbonate mineral weathering. Intensive agriculture and urbanization have led to the excessive input of nitrogen (N) into aquatic systems, while the high concentrations of inorganic C in the karst water might affect the N cycle. This paper summarized the characteristics of water in karst regions and discussed the N transformation coupled with the C cycle in the condition of high Ca2+ content, high

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7

Harbar, Vladyslav, and Andriy Lisovskiy. "Carbonations and carbonate profile forming processes of rendzinas of the Podilski Tovtry." Visnyk of the Lviv University. Series Geography, no. 51 (December 27, 2017): 88–97. http://dx.doi.org/10.30970/vgg.2017.51.8741.

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The peculiarities of content and profile distribution of carbonates in rendzinas and soil-forming rocks of the Podilski Tovtry are investigated. It has been determined that the predominant process of weathering of carbonate rocks is a chemical dissolution, in which carbonates are converted into bicarbonates and, in the case of washing water regime, are applied from the soil (the process of decarbonization) and mechanical grinding and destruction of the remaining carbonate inclusions in the process of soil cultivation. The dissolution of carbonate rocks causes accumulation in the soil profile o

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8

Song, Chao, Changli Liu, Guilin Han, and Congqiang Liu. "Impact of different fertilizers on carbonate weathering in a typical karst area, Southwest China: a field column experiment." Earth Surface Dynamics 5, no. 3 (2017): 605–16. http://dx.doi.org/10.5194/esurf-5-605-2017.

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Abstract. Carbonate weathering, as a significant vector for the movement of carbon both between and within ecosystems, is strongly influenced by agricultural fertilization, since the addition of fertilizers tends to change the chemical characteristics of soil such as the pH. Different fertilizers may exert a different impact on carbonate weathering, but these discrepancies are as yet not well-known. In this study, a field column experiment was conducted to explore the response of carbonate weathering to the addition of different fertilizers. We compared 11 different treatments, including a con

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9

Xie, Yincai, Yupei Hao, Jun Li, Yongli Guo, Qiong Xiao, and Fen Huang. "Influence of Anthropogenic Sulfuric Acid on Different Lithological Carbonate Weathering and the Related Carbon Sink Budget: Examples from Southwest China." Water 15, no. 16 (2023): 2933. http://dx.doi.org/10.3390/w15162933.

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Accurate estimate of carbonate weathering and the related carbon sink flux induced by anthropogenic H2SO4 is of great significance for improving understanding of the hydrogeochemical evolution and the global carbon cycle. Here, to quantitatively evaluate the influence of anthropogenic H2SO4 on different lithological carbonate weathering and the related carbon sink budget, karst spring water in the typical limestone and mixed limestone–dolomite catchments in Yaji and Beidiping affected by acid precipitation in southwest China were sampled monthly for the analysis of hydrochemical and δ13CDIC ch

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10

Cao, Yingjie, Yingxue Xuan, Changyuan Tang, Shuai Guan, and Yisheng Peng. "Temporary and net sinks of atmospheric CO<sub>2</sub> due to chemical weathering in subtropical catchment with mixing carbonate and silicate lithology." Biogeosciences 17, no. 14 (2020): 3875–90. http://dx.doi.org/10.5194/bg-17-3875-2020.

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Abstract. The study provided the major ion chemistry, chemical weathering rates and temporary and net CO2 sinks in the Bei Jiang, which was characterized as a hyperactive region with high chemical weathering rates, carbonate and silicate mixing lithology, and abundant sulfuric acid chemical weathering agent of acid deposition and acid mining drainage (AMD) origins. The total chemical weathering rate of 85.46 t km−2 a−1 was comparable to that of other rivers in the hyperactive zones between the latitudes 0 and 30∘. A carbonate weathering rate of 61.15 t km−2 a−1 contributed to about 70 % of the

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11

DA ROSA, ÁTILA AUGUSTO STOCK, NUNO LAMAS VALENTE PIMENTEL, and UBIRATAN FERRUCIO FACCINI. "Paleoalterações e Carbonatos em Depósitos Aluviais na Região de Santa Maria, Triássico Médio a Superior do Sul do Brasil." Pesquisas em Geociências 31, no. 1 (2004): 3. http://dx.doi.org/10.22456/1807-9806.19561.

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Five types of paleo-weathering and carbonate precipitation were recognized in fine-grained deposits of the Alemoa Member, Santa Maria Formation, Middle to Upper Triassic of southern Brazil. The fauna and flora found in these lithologies are important dating tools, but only in a generic way, misleading the time involved in periods of deposition and non deposition. The identified types of deposits are (i) reddish mudstones, with none or little paleo-weathering, (ii) mottled mudstones, with incipient pedogenesis, mainly mottling, destratification, animal and vegetal colonization, (iii) carbonate

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12

Li, Xiaoqiang, Guilin Han, Man Liu, Kunhua Yang, and Jinke Liu. "Hydro-Geochemistry of the River Water in the Jiulongjiang River Basin, Southeast China: Implications of Anthropogenic Inputs and Chemical Weathering." International Journal of Environmental Research and Public Health 16, no. 3 (2019): 440. http://dx.doi.org/10.3390/ijerph16030440.

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This study focuses on the chemical weathering process under the influence of human activities in the Jiulongjiang River basin, which is the most developed and heavily polluted area in southeast China. The average total dissolved solid (TDS) of the river water is 116.6 mg/L and total cation concentration ( TZ + ) is 1.5 meq/L. Calcium and HCO 3 − followed by Na + and SO 4 2 − constitute the main species in river waters. A mass balance based on cations calculation indicated that the silicate weathering (43.3%), carbonate weathering (30.7%), atmospheric (15.6%) and anthropogenic inputs (10.4%) ar

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13

Zhang, Yuanzheng, Wenlong Huang, Zhuohan Zhuang, et al. "Lithological Controls on Chemical Weathering and CO2 Consumption at Small Watershed Scale: Insights from Hydrochemistry and Stable Carbon Isotope." Water 17, no. 13 (2025): 2008. https://doi.org/10.3390/w17132008.

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Previous investigations into lithology-driven weathering processes have largely emphasized large-scale spatial assessments, while studies targeting small watershed scales remain scarce. This study investigated two adjacent watersheds (Chengjia: CJ; Datan: DT) under comparable climatic conditions in Guangdong, China, using hydrochemistry and stable carbon isotopes. The CJ watershed exhibited low-TDS (20–66 mg/L) HCO3-Na·Ca-type waters dominated by silicate weathering, whereas the DT watershed displayed high-TDS (70–278 mg/L) HCO3-Ca-type waters, indicative of mixed carbonate–silicate weathering

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14

Liu, Zaihua, Wolfgang Dreybrodt, and Huan Liu. "Atmospheric CO2 sink: Silicate weathering or carbonate weathering?" Applied Geochemistry 26 (June 2011): S292—S294. http://dx.doi.org/10.1016/j.apgeochem.2011.03.085.

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15

Roland, M., P. Serrano-Ortiz, A. S. Kowalski, et al. "Atmospheric turbulence triggers pronounced diel pattern in karst carbonate geochemistry." Biogeosciences 10, no. 7 (2013): 5009–17. http://dx.doi.org/10.5194/bg-10-5009-2013.

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Abstract. CO2 exchange between terrestrial ecosystems and the atmosphere is key to understanding the feedbacks between climate change and the land surface. In regions with carbonaceous parent material, CO2 exchange patterns occur that cannot be explained by biological processes, such as disproportionate outgassing during the daytime or nighttime CO2 uptake during periods when all vegetation is senescent. Neither of these phenomena can be attributed to carbonate weathering reactions, since their CO2 exchange rates are too small. Soil ventilation induced by high atmospheric turbulence is found t

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16

Roland, M., P. Serrano-Ortiz, A. S. Kowalski, et al. "Atmospheric turbulence triggers pronounced diel pattern in karst carbonate geochemistry." Biogeosciences Discussions 10, no. 1 (2013): 1207–27. http://dx.doi.org/10.5194/bgd-10-1207-2013.

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Abstract. CO2 exchange between terrestrial ecosystems and the atmosphere is key to understanding the feedbacks between climate change and the land surface. In regions with carbonaceous parent material, CO2 exchange patterns occur that cannot be explained by biological processes, such as disproportionate outgassing during daytime or nighttime CO2 uptake during periods when all vegetation is senescent. Neither of these phenomena can be attributed to carbonate weathering reactions, since their CO2 exchange rates are too small. Soil ventilation induced by high atmospheric turbulence is found to ex

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17

Kaustubh, Hakim. "Positive Weathering Feedback Compensates Carbonates at Shallow Ocean Depths." Proceedings of the International Astronomical Union 18, S382 (2022): 123–25. http://dx.doi.org/10.1017/s1743921323004957.

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AbstractContinental silicate weathering and seafloor carbonate precipitation are key steps in the carbonate-silicate cycle to draw down CO2. Contrary to the classic understanding of negative feedback, silicate weathering can exhibit positive feedback at high temperatures. Taking into account this positive feedback, the compensation depth (CCD) in exoplanet oceans becomes shallower, implying a potential instability in the carbonate-silicate cycle at high temperatures.

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18

Bufe, Aaron, Niels Hovius, Robert Emberson, et al. "Co-variation of silicate, carbonate and sulfide weathering drives CO2 release with erosion." Nature Geoscience 14, no. 4 (2021): 211–16. http://dx.doi.org/10.1038/s41561-021-00714-3.

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AbstractGlobal climate is thought to be modulated by the supply of minerals to Earth’s surface. Whereas silicate weathering removes carbon dioxide (CO2) from the atmosphere, weathering of accessory carbonate and sulfide minerals is a geologically relevant source of CO2. Although these weathering pathways commonly operate side by side, we lack quantitative constraints on their co-variation across erosion rate gradients. Here we use stream-water chemistry across an erosion rate gradient of three orders of magnitude in shales and sandstones of southern Taiwan, and find that sulfide and carbonate

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19

Marinoni, L., M. Setti, C. Salvi, and A. López-Galindo. "Clay minerals in late Quaternary sediments from the south Chilean margin as indicators of provenance and palaeoclimate." Clay Minerals 43, no. 2 (2008): 235–53. http://dx.doi.org/10.1180/claymin.2008.043.2.07.

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AbstractAn investigation of bulk-rock and clay-fraction compositions of two sedimentary cores from southern Chile was performed to evaluate the record of temporal climatic changes during the late Quaternary (11 ky and 30 ky BP). The bulk mineralogy shows an abundance of feldspars, mica and quartz, with lesser chlorite, amphibole and pyroxene, and variable amounts of carbonates. The clay fraction consists of illite, chlorite and scarce smectite. Smectite shows platy morphology, an Al-Fe beidellite chemical composition, and is detrital. Smectite, together with biogenic carbonate, increases in le

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20

Wen, Hang, Pamela L. Sullivan, Gwendolyn L. Macpherson, Sharon A. Billings, and Li Li. "Deepening roots can enhance carbonate weathering by amplifying CO<sub>2</sub>-rich recharge." Biogeosciences 18, no. 1 (2021): 55–75. http://dx.doi.org/10.5194/bg-18-55-2021.

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Abstract. Carbonate weathering is essential in regulating atmospheric CO2 and carbon cycle at the century timescale. Plant roots accelerate weathering by elevating soil CO2 via respiration. It however remains poorly understood how and how much rooting characteristics (e.g., depth and density distribution) modify flow paths and weathering. We address this knowledge gap using field data from and reactive transport numerical experiments at the Konza Prairie Biological Station (Konza), Kansas (USA), a site where woody encroachment into grasslands is surmised to deepen roots. Results indicate that

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21

Chang, Cheng, Howard Omar Beckford, and Hongbing Ji. "Indication of Sr Isotopes on Weathering Process of Carbonate Rocks in Karst Area of Southwest China." Sustainability 14, no. 8 (2022): 4822. http://dx.doi.org/10.3390/su14084822.

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Based on the determination of the major and trace element content, and the Sr isotope composition of soils from limestone and dolomite profiles in the karst area of Southwest (SW) China, this study discussed the distribution and migration characteristics of the elements and the influencing factors of Sr isotope fractionation, in order to better understand the chemical weathering and pedogenesis process, as well as to explore the material source of laterite. The chemical weathering analysis results (Chemical Index of Alteration, mass balance coefficient, and A-CN-K ternary) indicate that the we

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22

BREEMEN, N. VAN, and R. PROTZ. "RATES OF CALCIUM CARBONATE REMOVAL FROM SOILS." Canadian Journal of Soil Science 68, no. 2 (1988): 449–54. http://dx.doi.org/10.4141/cjss88-042.

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Mean annual rates of calcium carbonate removal from soils in a subarctic climate estimated from data on two chronosequences of calcareous storm ridges, appeared to be relatively constant through time. Concentrations of dissolved calcium carbonate in the soil solution in the study sites calculated from the rates of weathering of CaCO3 and of water drainage are in the range expected for equilibrium with calcite. The same conclusion could be drawn from published studies elsewhere. Over a wide range of conditions, the dissolution rate of calcite appears to be high enough to maintain equilibrium co

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23

van der Ploeg, Robin, Bernard P. Boudreau, Jack J. Middelburg, and Appy Sluijs. "Cenozoic carbonate burial along continental margins." Geology 47, no. 11 (2019): 1025–28. http://dx.doi.org/10.1130/g46418.1.

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Abstract Marine carbonate burial represents the largest long-term carbon sink at Earth’s surface, occurring in both deep-sea (pelagic) environments and shallower waters along continental margins. The distribution of carbonate accumulation has varied over geological history and impacts the carbon cycle and ocean chemistry, but it remains difficult to quantitatively constrain. Here, we reconstruct Cenozoic carbonate burial along continental margins using a mass balance for global carbonate alkalinity, which integrates independent estimates for continental weathering and pelagic carbonate burial.

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24

Romero-Mujalli, G., J. Hartmann, and J. Börker. "Temperature and CO2 dependency of global carbonate weathering fluxes – Implications for future carbonate weathering research." Chemical Geology 527 (November 2019): 118874. http://dx.doi.org/10.1016/j.chemgeo.2018.08.010.

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25

Zolkos, Scott, Suzanne E. Tank, Robert G. Striegl, et al. "Thermokarst amplifies fluvial inorganic carbon cycling and export across watershed scales on the Peel Plateau, Canada." Biogeosciences 17, no. 20 (2020): 5163–82. http://dx.doi.org/10.5194/bg-17-5163-2020.

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Abstract. As climate warming and precipitation increase at high latitudes, permafrost terrains across the circumpolar north are poised for intensified geomorphic activity and sediment mobilization that are expected to persist for millennia. In previously glaciated permafrost terrain, ice-rich deposits are associated with large stores of reactive mineral substrate. Over geological timescales, chemical weathering moderates atmospheric CO2 levels, raising the prospect that mass wasting driven by terrain consolidation following thaw (thermokarst) may enhance weathering of permafrost sediments and

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26

Bufe, Aaron, Kristen L. Cook, Albert Galy, Hella Wittmann, and Niels Hovius. "The effect of lithology on the relationship between denudation rate and chemical weathering pathways – evidence from the eastern Tibetan Plateau." Earth Surface Dynamics 10, no. 3 (2022): 513–30. http://dx.doi.org/10.5194/esurf-10-513-2022.

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Abstract. The denudation of rocks in mountain belts exposes a range of fresh minerals to the surface of the Earth that are chemically weathered by acidic and oxygenated fluids. The impact of the resulting coupling between denudation and weathering rates fundamentally depends on the types of minerals that are weathering. Whereas silicate weathering sequesters CO2, the combination of sulfide oxidation and carbonate dissolution emits CO2 to the atmosphere. Here, we combine the concentrations of dissolved major elements in stream waters with 10Be basin-wide denudation rates from 35 small catchment

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27

Ehlmann, Bethany L., John F. Mustard, Scott L. Murchie, et al. "Orbital Identification of Carbonate-Bearing Rocks on Mars." Science 322, no. 5909 (2008): 1828–32. http://dx.doi.org/10.1126/science.1164759.

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Geochemical models for Mars predict carbonate formation during aqueous alteration. Carbonate-bearing rocks had not previously been detected on Mars' surface, but Mars Reconnaissance Orbiter mapping reveals a regional rock layer with near-infrared spectral characteristics that are consistent with the presence of magnesium carbonate in the Nili Fossae region. The carbonate is closely associated with both phyllosilicate-bearing and olivine-rich rock units and probably formed during the Noachian or early Hesperian era from the alteration of olivine by either hydrothermal fluids or near-surface wat

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28

Wang, Di, Guilin Han, Bogen Li, et al. "Characteristics of Ions Composition and Chemical Weathering of Tributary in the Three Gorges Reservoir Region: The Perspective of Stratified Water Sample from Xiaojiang River." Water 14, no. 3 (2022): 379. http://dx.doi.org/10.3390/w14030379.

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River water chemistry offers information on watershed weathering and responds to the global carbon cycle. Watershed weathering processes and water chemistry in stratified water are still unclear in Xiaojiang River, as a major tributary of the Three Gorges Reservoir (TGR) which is the largest reservoir in the world. Major ions of river water at different depths were measured to reveal the ionic composition and chemical weathering properties by principal component analysis and stoichiometry in Xiaojiang River. Ca2+−HCO3− dominated the hydrochemical facies of river. Surface river water had the lo

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29

Zhao, Yanpu, Jan R. Wijbrans, Hua Wang, Pieter Z. Vroon, Jianghao Ma, and Yanqiong Zhao. "Chemical Weathering and CO2 Consumption Inferred from Riverine Water Chemistry in the Xi River Drainage, South China." International Journal of Environmental Research and Public Health 20, no. 2 (2023): 1516. http://dx.doi.org/10.3390/ijerph20021516.

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Hydrochemistry and strontium isotope data were analysed in water samples from the Xi River Drainage system to reveal the spatial and seasonal variations in chemical weathering, associated CO2 consumption fluxes, and their control factors. The main ions were Ca2+, Mg2+, and HCO3−, which are characteristic of a drainage system on carbonate-dominated bedrock. The dissolved loads were derived from four major end-member reservoirs: silicate, limestone, dolomite, and atmosphere. The silicate weathering rates (SWRs) increased downstream from 0.03 t/km2/year to 2.37 t/km2/year. The carbonate weatherin

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30

Kim, John H., Esteban G. Jobbágy, Daniel D. Richter, Susan E. Trumbore, and Robert B. Jackson. "Agricultural acceleration of soil carbonate weathering." Global Change Biology 26, no. 10 (2020): 5988–6002. http://dx.doi.org/10.1111/gcb.15207.

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31

Lehmann, Nele, Hugues Lantuit, Michael Ernst Böttcher, Jens Hartmann, Antje Eulenburg, and Helmuth Thomas. "Alkalinity generation from carbonate weathering in a silicate-dominated headwater catchment at Iskorasfjellet, northern Norway." Biogeosciences 20, no. 16 (2023): 3459–79. http://dx.doi.org/10.5194/bg-20-3459-2023.

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Abstract. The weathering rate of carbonate minerals is several orders of magnitude higher than for silicate minerals. Therefore, small amounts of carbonate minerals have the potential to control the dissolved weathering loads in silicate-dominated catchments. Both weathering processes produce alkalinity under the consumption of CO2. Given that only alkalinity generation from silicate weathering is thought to be a long-term sink for CO2, a misattributed weathering source could lead to incorrect conclusions about long- and short-term CO2 fixation. In this study, we aimed to identify the weatheri

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32

Lehmann, Nele, Hugues Lantuit, Michael Ernst Böttcher, Jens Hartmann, Antje Eulenburg, and Helmuth Thomas. "Alkalinity generation from carbonate weathering in a silicate-dominated headwater catchment at Iskorasfjellet, northern Norway." Biogeosciences 29, no. 16 (2023): 3459–79. https://doi.org/10.5194/bg-20-3459-2023.

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The weathering rate of carbonate minerals is several orders of magnitude higher than for silicate minerals. Therefore, small amounts of carbonate minerals have the potential to control the dissolved weathering loads in silicate-dominated catchments. Both weathering processes produce alkalinity under the consumption of CO2. Given that only alkalinity generation from silicate weathering is thought to be a long-term sink for CO2, a misattributed weathering source could lead to incorrect conclusions about long- and short-term CO2 fixation. In this study, we aimed to identify the weathering sources

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Wu, W. H., H. B. Zheng, and J. D. Yang. "Sr isotopic characteristics in two small watersheds draining typical silicate and carbonate rocks: implication for the studies on seawater Sr isotopic evolution." Hydrology and Earth System Sciences Discussions 10, no. 6 (2013): 8031–69. http://dx.doi.org/10.5194/hessd-10-8031-2013.

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Abstract. We systematically investigated Sr isotopic characteristics of small silicate watershed – the tributary Xishui River of the Yangtze River, and small carbonate watershed – the tributary Guijiang River of the Pearl River. The results show that the Xishui River has relatively high Sr concentrations (0.468–1.70 μmol L−1 in summer and 1.30–3.17 μmol L−1 in winter, respectively) and low 87Sr/86Sr ratios (0.708686–0.709148 in summer and 0.708515–0.709305 in winter), which is similar to the characteristics of carbonate weathering. The Guijiang River has low Sr concentrations (0.124–1.098 μmol

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Yang, Yibo, Xiaomin Fang, Erwin Appel, Albert Galy, Minghui Li, and Weilin Zhang. "Late Pliocene–Quaternary evolution of redox conditions in the western Qaidam paleolake (NE Tibetan Plateau) deduced from Mn geochemistry in the drilling core SG-1." Quaternary Research 80, no. 3 (2013): 586–95. http://dx.doi.org/10.1016/j.yqres.2013.07.007.

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Manganese (Mn) in lake sediments reacts strongly to changes of redox conditions. This study analyzed Mn concentrations in oxides, carbonates, and bulk phases of the calcareous lacustrine sediments of a 938.5-m-long core (SG-1) taken from the western Qaidam Basin, well dated from 2.77 Ma to 0.1 Ma. Comparisons of extractions from diluted hydrochloric acid, acetic acid and citrate"bicarbonate"dithionite demonstrate that variations of Mn concentrations from acetic acid leaching (MnHOAc) are mostly responsible for Mn (II) fluctuations in the carbonate phase. Taking into account the relevant proces

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Liu, Jinke, Guilin Han, Man Liu, Jie Zeng, Bin Liang, and Rui Qu. "Distribution, Sources and Water Quality Evaluation of the Riverine Solutes: A Case Study in the Lancangjiang River Basin, Tibetan Plateau." International Journal of Environmental Research and Public Health 16, no. 23 (2019): 4670. http://dx.doi.org/10.3390/ijerph16234670.

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To examine the chemical composition, potential sources of solutes, and water quality of Lancangjiang River, the concentrations of major ions (Ca2+, Mg2+, Na+, K+, HCO3−, SO42−, Cl− and NO3−) in 45 river water samples collected in July and August 2019 were determined. Ca2+ and HCO3− are the predominant ions in river water. The extremely low K+ and NO3− concentrations and the sparse population suggest that the anthropogenic inputs are limited. The Pearson correlation coefficients and the elemental ratios Ca2+/Na+ versus Mg2+/Na+, Ca2+/Na versus HCO3−/Na+, [Ca2+ + Mg2+]/[HCO3−] versus [SO42−]/[HC

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Anenburg, Michael, and Izzan Nur Aslam. "Calcite-saturated natrocarbonatites: composition, crystal morphology, and weathering." Volcanica 7, no. 2 (2024): 813–33. https://doi.org/10.30909/vol.07.02.813833.

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Interpretation of calcite-dominated fossil carbonatite volcanoes is complicated by the instability of many igneous carbonatite materials on Earth’s surface. One hypothesis suggests that they originate by eruption of alkali-free calcic carbonatite lavas. However, liquid calcite is not thermodynamically stable at atmospheric pressure. A second hypothesis suggests that calcite is secondary and formed after primary nyerereite lost its alkalis to surface water. Here, we experimentally test a combined hypothesis in which solid calcite phenocrysts are suspended in natrocarbonatite lava that solidifie

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Berner, Robert A. "The carbon cycle and carbon dioxide over Phanerozoic time: the role of land plants." Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences 353, no. 1365 (1998): 75–82. http://dx.doi.org/10.1098/rstb.1998.0192.

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A model (GEOCARB) of the long–term, or multimillion year, carbon cycle has been constructed which includes quantitative treatment of (1) uptake of atmospheric CO 2 by the weathering of silicate and carbonate rocks on the continents, and the deposition of carbonate minerals and organic matter in oceanic sediments; and (2) the release of CO 2 to the atmosphere via the weathering of kerogen in sedimentary rocks and degassing resulting from the volcanic–metamorphic–diagenetic breakdown of carbonates and organic matter at depth. Sensitivity analysis indicates that an important factor affecting CO 2

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Liu, Fan, Song Wang, Jia Wang, Fang Guo, Shi Yu, and Ping’an Sun. "The Hydrochemistry Characteristics and Chemical Weathering Intensity of an Anthropogenically Involved Catchment, South China." Water 16, no. 17 (2024): 2444. http://dx.doi.org/10.3390/w16172444.

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The hydrochemical characteristics of watersheds are influenced by many factors, with chemical weathering and human activities exerting the most substantial influence. Performing a quantitative evaluation of the factors contributing to the chemical weathering of rocks is of significant scientific importance. This research zeroes in on the Qingtang River basin to elaborate on the hydrochemical characteristic, explore the origins of ions, and quantify the influence of anthropogenic discharges amidst cation interferences, thus improving the accuracy of chemical weathering rate estimations. The sam

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Linzmeier, Benjamin J., Andrew D. Jacobson, Bradley B. Sageman, et al. "Calcium isotope evidence for environmental variability before and across the Cretaceous-Paleogene mass extinction." Geology 48, no. 1 (2019): 34–38. http://dx.doi.org/10.1130/g46431.1.

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Abstract Carbon dioxide release during Deccan Traps volcanism and the Chicxulub impact likely contributed to the Cretaceous-Paleogene (K-Pg) mass extinction; however, the intensity and duration of CO2 input differed between the two events. Large and rapid addition of CO2 to seawater causes transient decreases in pH, [CO32–], and carbonate mineral saturation states. Compensating mechanisms, such as dissolution of seafloor sediment, reduced biomineralization, and silicate weathering, mitigate these effects by increasing the same parameters. The calcium isotope ratios (δ44/40Ca) of seawater and m

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Moresi, M., and G. Mongelli. "The relation between the terra rossa and the carbonate-free residue of the underlying limestones and dolostones in Apulia, Italy." Clay Minerals 23, no. 4 (1988): 439–46. http://dx.doi.org/10.1180/claymin.1988.023.4.10.

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AbstractA statistical comparison has been made of chemical data for terra rossa and carbonate-free residues of Cretaceous limestones and dolostones in Apulia in order to evaluate the hypothesis that the terra rossa is a product of weathering of the underlying carbonate rocks. It has been shown that the differences in chemical composition between the residue of the carbonate rocks and the terra rossa are consistent with the former being the parent material of the latter. The transformation from carbonate rock residue to terra rossa was governed mainly by chemical weathering which produced a mar

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Kasioptas, A., C. Perdikouri, C. V. Putnis, and A. Putnis. "Pseudomorphic replacement of single calcium carbonate crystals by polycrystalline apatite." Mineralogical Magazine 72, no. 1 (2008): 77–80. http://dx.doi.org/10.1180/minmag.2008.072.1.77.

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AbstractDuring chemical weathering and natural hydrothermal reactions, apatite can form by replacing calcium carbonates. In hydrothermal experiments in which aragonite and calcite single crystals have been reacted with phosphate solutions, the carbonates are replaced by polycrystalline hydroxylapatite (HAP). In both cases the crystals have retained their overall morphology while their compositions have changed significantly. The HAP appears to have a crystallographic relationship to the parent carbonate crystals. The textural relationships are consistent with an interface-coupled dissolution-p

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Négrel, Philippe, Anna Ladenberger, Clemens Reimann, Alecos Demetriades, Manfred Birke, and Martiya Sadeghi. "GEMAS: adaptation of weathering indices for European agricultural soil derived from carbonate parent materials." Geochemistry: Exploration, Environment, Analysis 22, no. 1 (2021): geochem2021–059. http://dx.doi.org/10.1144/geochem2021-059.

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Carbonate rocks are very soluble and export elements in dissolved form, and precipitation of secondary phases can occur on a large scale. They leave a strong chemical signature in soil that can be quantified and classified by geochemical indices, and which is useful for evaluating chemical weathering trends (e.g. the Chemical Index of Alteration (CIA) or the Mafic Index of Alteration (MIA)). Due to contrasting chemical compositions and high Ca content, a special adaptation of classical weathering indices is necessary to interpret weathering trends in carbonate-derived soil. In fact, this adapt

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Liu, Wenjing, Zhifang Xu, Huiguo Sun, Tong Zhao, Chao Shi, and Taoze Liu. "Geochemistry of the dissolved loads during high-flow season of rivers in the southeastern coastal region of China: anthropogenic impact on chemical weathering and carbon sequestration." Biogeosciences 15, no. 16 (2018): 4955–71. http://dx.doi.org/10.5194/bg-15-4955-2018.

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Abstract. The southeastern coastal region is one of the most developed and populated areas in China. Meanwhile, it has been severely impacted by acid rain over many years. The chemical compositions and carbon isotope compositions of dissolved inorganic carbon (δ13CDIC) in river water in the high-flow season were investigated to estimate the chemical weathering and associated atmospheric CO2 consumption rates as well as the acid-deposition disturbance. Mass balance calculations indicated that the dissolved loads of major rivers in the Southeast Coastal River Basin (SECRB) were contributed to by

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Zhang, Liankai, Xiaoqun Qin, Qibo Huang, and Pengyu Liu. "Role of sulfuric acid in chemical weathering of carbonate rocks for evaluating of carbon sinks in the Yangtze River Basin, China." E3S Web of Conferences 98 (2019): 06015. http://dx.doi.org/10.1051/e3sconf/20199806015.

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Chemical weathering of rock by river systems is an important process in the global carbon cycle. Sulfuric acid produced from anthropogenic sources in the Yangtze River basin of China has the potential to change rock weathering processes and the carbon cycle. Monitoring and analysis of the dissolved constituents of the main channel and major tributaries of the Yangtze River indicate that the sulfuric acid has enhanced the carbonate rock weathering rate by an average of 28% and reduced the CO2 consumption rate by 12%. Analysis of dissolved sources for SO42- in the Yangtze River indicates that 36

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LIAN, Bin, Ye CHEN, Lijun ZHU, and Ruidong YANG. "Effect of Microbial Weathering on Carbonate Rocks." Earth Science Frontiers 15, no. 6 (2008): 90–99. http://dx.doi.org/10.1016/s1872-5791(09)60009-9.

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Gaillardet, Jérôme, Damien Calmels, Gibran Romero-Mujalli, Elena Zakharova, and Jens Hartmann. "Global climate control on carbonate weathering intensity." Chemical Geology 527 (November 2019): 118762. http://dx.doi.org/10.1016/j.chemgeo.2018.05.009.

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Godard, Vincent, Vincent Ollivier, Olivier Bellier, et al. "Weathering-limited hillslope evolution in carbonate landscapes." Earth and Planetary Science Letters 446 (July 2016): 10–20. http://dx.doi.org/10.1016/j.epsl.2016.04.017.

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Tang, Pan, Xiangrong Yang, and Detian Yan. "Enhanced Continental Weathering Triggered the Anoxia of Seawater and Mass Extinctions During the Late Ordovician." Journal of Marine Science and Engineering 12, no. 12 (2024): 2237. https://doi.org/10.3390/jmse12122237.

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During the Late Ordovician period, changes in climate and mass extinctions were observed; however, the factors influencing these phenomena have not been fully understood. In order to understand the relationships among redox water conditions, climates, and mass extinctions in the Late Ordovician, this study analyzes the chemical index of alteration (CIA) in shales and 87Sr/86Sr in carbonate leachates as proxies of changes in chemical weathering intensity and chemical weathering rate in the Late Ordovician (mainly from Katian to Hirnantian). The results show that an enhanced chemical weathering

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Mansour, Ahmed, Thomas Gentzis, Ibrahim M. Ied, Mohamed S. Ahmed, and Michael Wagreich. "Paleoenvironmental Conditions and Factors Controlling Organic Carbon Accumulation during the Jurassic–Early Cretaceous, Egypt: Organic and Inorganic Geochemical Approach." Minerals 12, no. 10 (2022): 1213. http://dx.doi.org/10.3390/min12101213.

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The Jurassic–Early Cretaceous was a time of variable organic carbon burial associated with fluctuations of marine primary productivity, weathering intensity, and redox conditions in the pore and bottom water at paleo-shelf areas in north Egypt. This time interval characterized the deposition of, from old to young, the Bahrein, Khatatba, Masajid, and Alam El Bueib Formations in the north Western Desert. Although several studies have been devoted to the excellent source rock units, such as the Khatatba and Alam El Bueib Formations, studies on paleoenvironmental changes in redox conditions, paleo

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Vasarevičius, Saulius, Jurgita Seniūnaitė, and Vaidotas Vaišis. "Impact of Natural Weathering on Stabilization of Heavy Metals (Cu, Zn, and Pb) in MSWI Bottom Ash." Applied Sciences 12, no. 7 (2022): 3419. http://dx.doi.org/10.3390/app12073419.

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Bottom ash (BA) is the main residue left by municipal solid waste incineration (MSWI). As the circular economy is strengthened, the use of BA in civil engineering is increasing, but its successful use is hampered by heavy metal leaching. In this study, we investigated the influence of natural weathering (6 months) on the stabilization of heavy metals (Cu, Zn, and Pb) with different particle sizes in MSWI BA. Natural weathering is the most popular and cost-effective treatment method for BA. During this process, calcium carbonate (CaCO3) is produced, which causes a reduction in heavy metal leach

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