Changing isotope compositions of Mg, Ca and Sr in bulk crystalline rocks toward the weathering front: Disentangling inputs of geogenic base cations into ecosystems
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F25%3A10169717" target="_blank" >RIV/00025798:_____/25:10169717 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11310/25:10506307 RIV/00216208:11320/25:10506307
Result on the web
<a href="https://doi.org/10.1016/j.apgeochem.2025.106577" target="_blank" >https://doi.org/10.1016/j.apgeochem.2025.106577</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.apgeochem.2025.106577" target="_blank" >10.1016/j.apgeochem.2025.106577</a>
Alternative languages
Result language
angličtina
Original language name
Changing isotope compositions of Mg, Ca and Sr in bulk crystalline rocks toward the weathering front: Disentangling inputs of geogenic base cations into ecosystems
Original language description
Quantification of geogenic inputs of magnesium (Mg) and calcium (Ca) as essential nutrients, and strontium (Sr) as a Ca proxy, into biomass and catchment runoff is indispensable for studies of forest sustainability in an era of persisting acidification and climatic change. Supergene processes control the isotope composition of base cations released from bedrock into solution. Isotope signatures of dissolved Mg2+, Ca2+ and Sr2+ are complementary to the isotope composition of weathered rock because both are derived from the same parent material. We investigated shifts in S26Mg, S44Ca, and 87Sr/86Sr isotope ratios from fresh bedrock toward the weathering front in six common crystalline lithologies, including leucocratic granite, quartz diorite, melasyenite, melagranite, augen gneiss and amphibolite. About 20 cm below the deepest soil horizon, the isotopic composition of Mg, Ca and Sr in weathered rock differed significantly from that of fresh rock in nine out of 18 cases. Bulk-rock S26Mg and S44Ca values were less sensitive to partial dissolution of minerals than 87Sr/86Sr ratios. Statistically significant shifts in 87Sr/86Sr were observed in all six lithologies. Weathered rock had higher 87Sr/86Sr ratios than fresh rock in three cases, and lower 87Sr/86Sr ratios in another three cases. The site-specific 87Sr/86Sr shift was explained by contrasting weathering rates of Rb-rich and Rb-poor minerals in most rocks. Both lower S26Mg and higher S44Ca values of weathered amphibolite were likely related to isotope fractionations accompanying in-situ formation of secondary smectite. Continuing mineral dissolution in overlaying soils may cause additional Mg, Ca and Sr isotope effects.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10505 - Geology
Result continuities
Project
<a href="/en/project/GA21-27420S" target="_blank" >GA21-27420S: Controls of Mg, Ca and Sr isotope signals in catchment runoff: A multiple-site approach</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Applied Geochemistry
ISSN
0883-2927
e-ISSN
1872-9134
Volume of the periodical
193
Issue of the periodical within the volume
106577
Country of publishing house
GB - UNITED KINGDOM
Number of pages
13
Pages from-to
nestránkováno
UT code for WoS article
001590535700001
EID of the result in the Scopus database
2-s2.0-105017764450