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• W2790753625 endingPage "335" @default.
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• W2790753625 abstract "Little is known about the fractionation of Li isotopes during formation of biogenic carbonates, which form the most promising geological archives of past seawater composition. Here we investigated the Li isotope composition (δ7Li) and Li/Ca ratios of organisms that are abundant in the Phanerozoic record: mollusks (mostly bivalves), echinoderms, and brachiopods. The measured samples include (i) modern calcite and aragonite shells from various species and natural environments (13 mollusk samples, 5 brachiopods and 3 echinoderms), and (ii) shells from mollusks grown under controlled conditions at various temperatures. When possible, the mollusk shell ultrastructure was micro-sampled in order to assess intra-shell heterogeneity. In this paper, we systematically characterize the influence of mineralogy, temperature, and biological processes on the δ7Li and Li/Ca of these shells and compare with published data for other taxa (foraminifera and corals). Aragonitic mollusks have the lowest δ7Li, ranging from +16 to +22‰, echinoderms have constant δ7Li of about +24‰, brachiopods have δ7Li of +25 to +28‰, and finally calcitic mollusks have the largest range and highest δ7Li values, ranging from +25‰ to +40‰. Measured brachiopods have similar δ7Li compared to inorganic calcite precipitated from seawater (δ7Li of +27 to +29‰), indicating minimum influence of vital effects, as also observed for other isotope systems and making them a potentially viable proxy of past seawater composition. Calcitic mollusks, on the contrary, are not a good archive for seawater paleo–δ7Li because many samples have significantly higher δ7Li values than inorganic calcite and display large inter-species variability, which suggests large vital effects. In addition, we observe very large intra-shell variability, in particular for mixed calcite-aragonite shells (over 20‰ variability), but also in mono-mineralic shells (up to 12‰ variability). Aragonitic bivalves have less variable δ7Li (7‰ variability) compared to calcitic mollusks, but with significantly lower δ7Li compared to inorganic aragonite, indicating the existence of vital effects. Bivalves grown at various temperatures show that temperature has only a minor influence on fractionation of Li isotopes during shell precipitation. Interestingly, we observe a strong correlation (R2 = 0.83) between the Li/Mg ratio in bivalve Mytilus edulis and temperature, with potential implications for paleo-temperature reconstructions. Finally, we observe a negative correlation between the δ7Li and both the Li/Ca and Mg/Ca ratio of calcite mollusks, which we relate to biomineralization processes. To explain this correlation, we propose preferential removal of 6Li from the calcification site of calcite mollusks by physiological processes corresponding to the regulation of the amount of Mg in the calcifying medium. We calculate that up to 80% of the initial Li within the calcification site is removed by this process, leading to high δ7Li and low Li/Ca in some calcite mollusk specimens. Collectively, these results suggest that Mg (and thus [Li]) is strongly biologically controlled within the calcifying medium of calcite mollusks. Overall, the results of this study show that brachiopods are likely to be suitable targets for future work on the determination of paleo-seawater Li isotope composition—an emerging proxy for past weathering and hydrothermal processes." @default.
• W2790753625 created "2018-03-29" @default.
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• W2790753625 date "2018-09-01" @default.
• W2790753625 modified "2023-10-17" @default.
• W2790753625 title "The Li isotope composition of marine biogenic carbonates: Patterns and mechanisms" @default.
• W2790753625 cites W1487040053 @default.
• W2790753625 cites W1550422395 @default.
• W2790753625 cites W1584611723 @default.
• W2790753625 cites W1625363718 @default.
• W2790753625 cites W1682777677 @default.
• W2790753625 cites W1707332795 @default.
• W2790753625 cites W1825541612 @default.
• W2790753625 cites W1894009859 @default.
• W2790753625 cites W1964132446 @default.
• W2790753625 cites W1967824732 @default.
• W2790753625 cites W1970285508 @default.
• W2790753625 cites W1970336648 @default.
• W2790753625 cites W1972423795 @default.
• W2790753625 cites W1976984111 @default.
• W2790753625 cites W1977918184 @default.
• W2790753625 cites W1981687253 @default.
• W2790753625 cites W1984117161 @default.
• W2790753625 cites W1989106425 @default.
• W2790753625 cites W1989201701 @default.
• W2790753625 cites W1991442438 @default.
• W2790753625 cites W1992161729 @default.
• W2790753625 cites W1993792503 @default.
• W2790753625 cites W1997901347 @default.
• W2790753625 cites W2002673413 @default.
• W2790753625 cites W2010301432 @default.
• W2790753625 cites W2010637391 @default.
• W2790753625 cites W2011556233 @default.
• W2790753625 cites W2015234718 @default.
• W2790753625 cites W2016118157 @default.
• W2790753625 cites W2017276220 @default.
• W2790753625 cites W2018224707 @default.
• W2790753625 cites W2021027346 @default.
• W2790753625 cites W2023235007 @default.
• W2790753625 cites W2023238257 @default.
• W2790753625 cites W2025127065 @default.
• W2790753625 cites W2030750129 @default.
• W2790753625 cites W2032127570 @default.
• W2790753625 cites W2032187872 @default.
• W2790753625 cites W2034673247 @default.
• W2790753625 cites W2035377063 @default.
• W2790753625 cites W2044080168 @default.
• W2790753625 cites W2046088045 @default.
• W2790753625 cites W2047706879 @default.
• W2790753625 cites W2048417758 @default.
• W2790753625 cites W2048444857 @default.
• W2790753625 cites W2054610126 @default.
• W2790753625 cites W2054654112 @default.
• W2790753625 cites W2058183493 @default.
• W2790753625 cites W2058721748 @default.
• W2790753625 cites W2058875888 @default.
• W2790753625 cites W2063574244 @default.
• W2790753625 cites W2073036011 @default.
• W2790753625 cites W2077757183 @default.
• W2790753625 cites W2080503734 @default.
• W2790753625 cites W2080775337 @default.
• W2790753625 cites W2082434006 @default.
• W2790753625 cites W2084280680 @default.
• W2790753625 cites W2084825481 @default.
• W2790753625 cites W2086543217 @default.
• W2790753625 cites W2086782132 @default.
• W2790753625 cites W2094438399 @default.
• W2790753625 cites W2099506904 @default.
• W2790753625 cites W2107531399 @default.
• W2790753625 cites W2112267421 @default.
• W2790753625 cites W2112370094 @default.
• W2790753625 cites W2115234977 @default.
• W2790753625 cites W2116484408 @default.
• W2790753625 cites W2117619613 @default.
• W2790753625 cites W2121157063 @default.
• W2790753625 cites W2126156012 @default.
• W2790753625 cites W2132932554 @default.
• W2790753625 cites W2136852811 @default.
• W2790753625 cites W2137591482 @default.
• W2790753625 cites W2149482874 @default.
• W2790753625 cites W2151893686 @default.
• W2790753625 cites W2155783817 @default.
• W2790753625 cites W2156694865 @default.
• W2790753625 cites W2159371299 @default.
• W2790753625 cites W2163205899 @default.
• W2790753625 cites W2163941217 @default.

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