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- W2742224512 abstract "The δ13C and δ18O values of fossil brachiopod shells have been widely used as paleoenvironmental proxies. In this study, we investigated intrashell and intraspecific variations in the isotopic and minor element concentrations of well-preserved shells of the brachiopod Kikaithyris hanzawai (Yabe) from the last glacial period (∼20 ka [Last Glacial Maximum; LGM] and ∼70 ka [Marine Isotope Stage 4; MIS4]), collected in the Central Ryukyus, and used these data to estimate the paleoceanographic conditions (seawater temperature, concentration of dissolved inorganic carbon [DIC], and δ13C value of DIC [δ13CDIC]). The δ13C and δ18O profiles along the maximum growth axis, obtained from the inner shell surface, show three distinct intervals, corresponding to changes in shell morphology. These results suggest that the bulk isotopic compositions of brachiopods with complex shell morphologies are unsuitable for paleoenvironmental reconstructions. Nevertheless, there exists a specific shell portion with relatively small intrashell and intraspecific variations. The past seawater temperatures derived from the δ18O values of this portion are consistent with the alkenone- and planktic foraminiferal Mg/Ca-based past seawater temperatures reported in previous studies. The past δ13CDIC values estimated from the δ13C values of the specific shell portion are within the range of the past δ13CDIC values calculated from known atmospheric and oceanographic parameters. The past DIC concentrations reconstructed from the brachiopod-based δ13CDIC values are lower than the present concentrations in the East China Sea, which can be explained by low partial pressure of CO2 during the last glacial period. These results indicate that the δ13C and δ18O values obtained from K. hanzawai shells are potential paleoenvironmental indicators. The intrashell and intraspecific variations in the K. hanzawai shells are different for each minor element. Some anomalously high Mn and Fe concentrations in the shells are probably caused by metabolic factor(s), not by meteoric diagenesis. This suggests that the minor element concentrations are useful but not perfect for distinguishing diagenetically altered and unaltered portions of the shells of K. hanzawai in the studied succession." @default.
- W2742224512 created "2017-08-17" @default.
- W2742224512 creator A5003398694 @default.
- W2742224512 creator A5009517322 @default.
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- W2742224512 creator A5021091713 @default.
- W2742224512 creator A5023122619 @default.
- W2742224512 creator A5051741523 @default.
- W2742224512 date "2017-10-01" @default.
- W2742224512 modified "2023-09-24" @default.
- W2742224512 title "Paleoceanographic conditions at approximately 20 and 70 ka recorded in Kikaithyris hanzawai (Brachiopoda) shells" @default.
- W2742224512 cites W121857346 @default.
- W2742224512 cites W1227686512 @default.
- W2742224512 cites W1524241931 @default.
- W2742224512 cites W1538017559 @default.
- W2742224512 cites W1548489509 @default.
- W2742224512 cites W1550730432 @default.
- W2742224512 cites W1563991132 @default.
- W2742224512 cites W1568764956 @default.
- W2742224512 cites W1571909543 @default.
- W2742224512 cites W1576815048 @default.
- W2742224512 cites W1596936224 @default.
- W2742224512 cites W1610109451 @default.
- W2742224512 cites W1635474492 @default.
- W2742224512 cites W1682777677 @default.
- W2742224512 cites W1962995471 @default.
- W2742224512 cites W1966701580 @default.
- W2742224512 cites W1969746988 @default.
- W2742224512 cites W1970285508 @default.
- W2742224512 cites W1972423795 @default.
- W2742224512 cites W1974045235 @default.
- W2742224512 cites W1974194861 @default.
- W2742224512 cites W1976843455 @default.
- W2742224512 cites W1978338754 @default.
- W2742224512 cites W1979857281 @default.
- W2742224512 cites W1981207728 @default.
- W2742224512 cites W1981687253 @default.
- W2742224512 cites W1983864770 @default.
- W2742224512 cites W1984363591 @default.
- W2742224512 cites W1994027801 @default.
- W2742224512 cites W1995104316 @default.
- W2742224512 cites W1996662904 @default.
- W2742224512 cites W2002412491 @default.
- W2742224512 cites W2003868383 @default.
- W2742224512 cites W2005635856 @default.
- W2742224512 cites W2005749071 @default.
- W2742224512 cites W2010301432 @default.
- W2742224512 cites W2011306277 @default.
- W2742224512 cites W2014796857 @default.
- W2742224512 cites W2015486378 @default.
- W2742224512 cites W2018258520 @default.
- W2742224512 cites W2022266893 @default.
- W2742224512 cites W2024837562 @default.
- W2742224512 cites W2026455754 @default.
- W2742224512 cites W2026918283 @default.
- W2742224512 cites W2027755356 @default.
- W2742224512 cites W2028384412 @default.
- W2742224512 cites W2030604405 @default.
- W2742224512 cites W2031171042 @default.
- W2742224512 cites W2032180578 @default.
- W2742224512 cites W2034575670 @default.
- W2742224512 cites W2040662071 @default.
- W2742224512 cites W2046698450 @default.
- W2742224512 cites W2051137249 @default.
- W2742224512 cites W2053883873 @default.
- W2742224512 cites W2054665748 @default.
- W2742224512 cites W2055611952 @default.
- W2742224512 cites W2058304931 @default.
- W2742224512 cites W2060233543 @default.
- W2742224512 cites W2074430415 @default.
- W2742224512 cites W2076327546 @default.
- W2742224512 cites W2077826221 @default.
- W2742224512 cites W2078443211 @default.
- W2742224512 cites W2080455717 @default.
- W2742224512 cites W2081243991 @default.
- W2742224512 cites W2081466015 @default.
- W2742224512 cites W2081869643 @default.
- W2742224512 cites W2082422470 @default.
- W2742224512 cites W2082460606 @default.
- W2742224512 cites W2083986366 @default.
- W2742224512 cites W2086406468 @default.
- W2742224512 cites W2087827426 @default.
- W2742224512 cites W2090237682 @default.
- W2742224512 cites W2090946879 @default.
- W2742224512 cites W2093142430 @default.
- W2742224512 cites W2095605097 @default.
- W2742224512 cites W2096295282 @default.
- W2742224512 cites W2097369737 @default.
- W2742224512 cites W2101665356 @default.
- W2742224512 cites W2104767656 @default.
- W2742224512 cites W2106722441 @default.
- W2742224512 cites W2108438564 @default.
- W2742224512 cites W2109836886 @default.
- W2742224512 cites W2113610808 @default.
- W2742224512 cites W2114142149 @default.
- W2742224512 cites W2115264871 @default.
- W2742224512 cites W2118108326 @default.
- W2742224512 cites W2119689998 @default.