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• W3204353883 endingPage "110671" @default.
• W3204353883 startingPage "110671" @default.
• W3204353883 abstract "Carbon isotopes of terrestrial gastropod yield insights on age and paleoenvironments for many depositional settings, but questions remain on the carbon source for gastropod carbonate and the climatic significance. This study documented for four terrestrial gastropod species (Rabdotus dealbatus, A. alternata, V. indentata, and Rumina decollata) from central Texas 14C age offsets between shell‑carbonate and corresponding atmosphere values that lived on carbonate- and kerogen-rich Cretaceous bedrock in the 20th and 21st centuries. Also, the ontogenetic variations in 14C content were assessed to better understand carbon cycling between gastropods and the associated reservoirs. The carbon sources were partitioned based on 13C isotopic values to evaluate the possible causes for age anomalies using initially a three-component model that includes contributions from atmosphere, vegetation, and limestone pools, with a new added fourth component, for soil organic carbon. The average (n = 4) of the outer and inner shell samples yielded the respective 14C ages of 550 ± 325 and 1520 ± 525 yr B.P. The apparent linearized 14C distance-age anomaly for an individual gastropod whorl is 4–26 mm/yr calculate from shell 14C ages on apex and aperture material. The smallest gastropod dated, a single V. indentata test (3.9 mg) yielded the oldest 14C age of 2340 yr B.P. The four-component model for the oldest 14C ages indicates that 50–85% of shell carbon may be from ingestion, with a smaller pool from respiration. Up to 30% of the organic carbon in gastropod shell may be derived from soil organic carbon. Terrestrial gastropods that yield anomalously old 14C ages of >500 years may be detritivores and live in soils with sources of labile old carbon either inherited from the bedrock and/or the older pool of soil organic matter common in well-developed calcium-rich soils." @default.
• W3204353883 created "2021-10-11" @default.
• W3204353883 creator A5024962599 @default.
• W3204353883 creator A5054769329 @default.
• W3204353883 creator A5074196742 @default.
• W3204353883 creator A5079265926 @default.
• W3204353883 date "2021-12-01" @default.
• W3204353883 modified "2023-10-16" @default.
• W3204353883 title "Radiocarbon age offsets, ontogenetic effects, and potential old carbon contributions from soil organic matter for pre-bomb and modern detritivorous gastropods from central Texas, USA" @default.
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• W3204353883 doi "https://doi.org/10.1016/j.palaeo.2021.110671" @default.
• W3204353883 hasPublicationYear "2021" @default.

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