Magnetic minerals in sediments at the Cretaceous/Paleogene boundary (the Gams Section, Eastern Alps)

Grachev, A. F.; Pechersky, D. M.; Borisovskii, S. E.; Tselmovich, V. A.

doi:10.1134/s1069351308100078

Cited by 6 publications

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“…Since both pyrite oxidation and gypsum dissolution lead to an increase of SO 4 − in river waters (e.g., Berner and Berner, 1996), distinguishing between the gypsum and pyrite sources of SO 4 − in river waters is important for a reliable estimation of the fluxes of atmospheric CO 2 consumed by chemical weathering (Moon et al, 2007). We know that the presence of pyrite in the Alps is well documented (e.g., Kappler and Zeeh, 2000;Lavrič and Spangenberg, 2003;Rantitsch, 2007;Gainon et al, 2007;Grachev et al, 2008;Bernard et al, 2010;Herlec et al, 2010;Sanders et al, 2010;Sabatino et al, 2011;Pálfy and Zajzon, 2012). In addition, in the river waters sampled by Donnini et al (2016), the samples with a relevant sulfate enrichment were located in the southwest French Alps (Roia, Var, Isere, Durance) and in the southeastern Italian Alps (Tagliamento).…”

Section: Atmospheric Co 2 Consumption In Alpine Basinsmentioning

confidence: 99%

A new Alpine geo-lithological map (Alpine-Geo-LiM) and global carbon cycle implications

2020

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The chemical composition of river waters gives a measure of the atmospheric CO2 fixed by chemical weathering processes. Since the dominating factors controlling these processes are lithology and runoff, as well as uplift and erosion, we introduce a new simplified geo-lithological map of the Alps (Alpine-Geo-LiM) that adopted a lithological classification compliant with the methods most used in literature for estimating the consumption of atmospheric CO2 by chemical weathering. The map was used together with published alkalinity data of the 33 main Alpine rivers (1) to investigate the relationship between bicarbonate concentration in the sampled waters and the lithologies of the corresponding drained basins, and (2) to quantify the atmospheric CO2 consumed by chemical weathering. The analyses confirm (as known by the literature) that carbonates are lithologies highly prone to consuming atmospheric CO2. Moreover, the analyses show that sandstone (which could have a nonnegligible carbonate component) plays an important role in consuming atmospheric CO2. Another result is that in multilithological basins containing lithologies more prone to consuming atmospheric CO2, the contribution of igneous rocks to the atmospheric CO2 consumption is negligible. Alpine-Geo-LiM has several novel features when compared with published global lithological maps. One novel feature is due to the attention paid in discriminating metamorphic rocks, which were classified according to the chemistry of protoliths. The second novel feature is that the procedure used for the definition of the map was made available on the Web to allow the replicability and reproducibility of the product.

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