Matches in SemOpenAlex for { <https://semopenalex.org/work/W2941102955> ?p ?o ?g. }
- W2941102955 endingPage "489" @default.
- W2941102955 startingPage "467" @default.
- W2941102955 abstract "Abstract The ca . 1.9 Ga Beaverlodge Lake paleosol was studied using redox‐sensitive Cr isotopes in order to determine the isotopic response to paleoweathering of a rhyodacite parent rock 500 million years after the Great Oxidation Event. Redox reactions occurring in modern weathering environments produce Cr(VI) that is enriched in heavy Cr isotopes compared to the igneous inventory. Cr(VI) species are soluble and easily leached from soils into streams and rivers, thus, leaving particle‐reactive and isotopically light Cr(III) species to build up in soils. The Beaverlodge Lake paleosol and two other published weathering profiles of similar age, the Flin Flon and Schreiber Beach paleosols, are not as isotopically light as modern soils, indicating that rivers were not as isotopically heavy at that time. Considering that the global average δ 53 Cr value for the oxidative weathering flux of Cr to the oceans today is just 0.27 ± 0.30‰ (1σ) based on a steady‐state analysis of the modern ocean Cr cycle, the oxidative weathering flux of Cr to the oceans at ca . 1.9 Ga would have likely been shifted to lower δ 53 Cr values, and possibly lower than the igneous inventory (–0.12 ± 0.10‰, 2σ). Mn oxides are the main oxidant of Cr(III) in modern soils, but there is no evidence that they formed in the studied paleosols. Cr(VI) may have formed by direct oxidation of Cr(III) using molecular oxygen or H 2 O 2 , but neither pathway is as efficient as Mn oxides for producing Cr(VI). The picture that emerges from this and other studies of Cr isotope variation in ca . 1.9 Ga paleosols is of atmospheric oxygen concentrations that are high enough to oxidize iron, but too low to oxidize Mn, resulting in low Cr(VI) inventories in Earth surface environments." @default.
- W2941102955 created "2019-05-03" @default.
- W2941102955 creator A5004449689 @default.
- W2941102955 creator A5009960346 @default.
- W2941102955 creator A5012345677 @default.
- W2941102955 creator A5015545603 @default.
- W2941102955 creator A5084243909 @default.
- W2941102955 date "2019-04-21" @default.
- W2941102955 modified "2023-10-14" @default.
- W2941102955 title "Cr isotopic insights into <i>ca</i> . 1.9 Ga oxidative weathering of the continents using the Beaverlodge Lake paleosol, Northwest Territories, Canada" @default.
- W2941102955 cites W1502457072 @default.
- W2941102955 cites W1554646649 @default.
- W2941102955 cites W1654965845 @default.
- W2941102955 cites W1772786931 @default.
- W2941102955 cites W1831713658 @default.
- W2941102955 cites W1967350649 @default.
- W2941102955 cites W1974045653 @default.
- W2941102955 cites W1974414017 @default.
- W2941102955 cites W1975373641 @default.
- W2941102955 cites W1980270634 @default.
- W2941102955 cites W1980361407 @default.
- W2941102955 cites W1980942879 @default.
- W2941102955 cites W1981699699 @default.
- W2941102955 cites W1983714620 @default.
- W2941102955 cites W1985317544 @default.
- W2941102955 cites W1991800138 @default.
- W2941102955 cites W1992068942 @default.
- W2941102955 cites W1992420868 @default.
- W2941102955 cites W1994318444 @default.
- W2941102955 cites W1997885583 @default.
- W2941102955 cites W1997905954 @default.
- W2941102955 cites W1999057913 @default.
- W2941102955 cites W1999816685 @default.
- W2941102955 cites W2003877206 @default.
- W2941102955 cites W2013528197 @default.
- W2941102955 cites W2014831208 @default.
- W2941102955 cites W2019722317 @default.
- W2941102955 cites W2022885774 @default.
- W2941102955 cites W2024004860 @default.
- W2941102955 cites W2030246380 @default.
- W2941102955 cites W2032698695 @default.
- W2941102955 cites W2032707538 @default.
- W2941102955 cites W2036057044 @default.
- W2941102955 cites W2036582486 @default.
- W2941102955 cites W2038631041 @default.
- W2941102955 cites W2039078568 @default.
- W2941102955 cites W2046315400 @default.
- W2941102955 cites W2046573595 @default.
- W2941102955 cites W2046892047 @default.
- W2941102955 cites W2049951224 @default.
- W2941102955 cites W2051137378 @default.
- W2941102955 cites W2053325712 @default.
- W2941102955 cites W2053408325 @default.
- W2941102955 cites W2055723541 @default.
- W2941102955 cites W2056482280 @default.
- W2941102955 cites W2057262327 @default.
- W2941102955 cites W2060563278 @default.
- W2941102955 cites W2062900030 @default.
- W2941102955 cites W2066760610 @default.
- W2941102955 cites W2067958795 @default.
- W2941102955 cites W2067961533 @default.
- W2941102955 cites W2071712391 @default.
- W2941102955 cites W2072891964 @default.
- W2941102955 cites W2073562922 @default.
- W2941102955 cites W2074334185 @default.
- W2941102955 cites W2074414565 @default.
- W2941102955 cites W2085487206 @default.
- W2941102955 cites W208714008 @default.
- W2941102955 cites W2087937118 @default.
- W2941102955 cites W2090027771 @default.
- W2941102955 cites W2098107208 @default.
- W2941102955 cites W2099454424 @default.
- W2941102955 cites W2104224684 @default.
- W2941102955 cites W2105660946 @default.
- W2941102955 cites W2107212167 @default.
- W2941102955 cites W2115164731 @default.
- W2941102955 cites W2121733630 @default.
- W2941102955 cites W2122014250 @default.
- W2941102955 cites W2126424023 @default.
- W2941102955 cites W2128845499 @default.
- W2941102955 cites W2136529701 @default.
- W2941102955 cites W2136617541 @default.
- W2941102955 cites W2154982349 @default.
- W2941102955 cites W2161537617 @default.
- W2941102955 cites W2196178012 @default.
- W2941102955 cites W2202599683 @default.
- W2941102955 cites W2258757233 @default.
- W2941102955 cites W2258839491 @default.
- W2941102955 cites W2259984062 @default.
- W2941102955 cites W2273926423 @default.
- W2941102955 cites W2312569948 @default.
- W2941102955 cites W2337557054 @default.
- W2941102955 cites W2343613602 @default.
- W2941102955 cites W2343689725 @default.
- W2941102955 cites W2402234408 @default.
- W2941102955 cites W2414616403 @default.
- W2941102955 cites W2417936857 @default.
- W2941102955 cites W2472978716 @default.