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高知県の鮮新統穴内層産二枚貝チョウセンハマグリの酸素同位体比

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(1)òžÛ6şĿƠÖƭţćƯǚŸ\oNYvdkSq 6ĉšƥ{űƺ ƐǤů ĆƗǥń 1ÈơëŐ 1,2 1 òžŶ¥Ŷ¥ Ŧôń¬ęŠ–¥Ú½–Ǯ¥Řì2 òžŶ¥ęŠ–¥ÐǮ¥Džǡ. Oxygen Isotope Ratios of the Bivalve Meretrix lamarcki from the Pliocene Ananai Formation, Kochi Yuta Yamaoka 1, Yuto Yamada 1, Yasuo Kondo 1,2. 1. Studies in Sciences, Graduate School of Integrated Arts and Sciences, Kochi University; 2. Sciences Unit, Natural Sciences Cluster, Kochi University. Abstract Oxygen isotope ratios were analyzed for two individuals of Meretrix lamarcki from the Late Pliocene Ananai Formation on the northeastern coast of Tosa Bay and one individual of the same species from Tosa Bay.. Meretrix lamarcki lives in shallow sea off sandy beaches, away from the influence of freshwater. 18O value of this species can, therefore, be safely used for the estimation of water temperature. One individual shows a wide range of 18O value from -4.1 to 0.5 ‰, indicating seasonal change in water temperature of 21. a smaller range of. 18O,. Another individual shows. corresponding to the seasonal change in water temperature of 15. 18O data of a modern. specimen from Tosa Bay are intermediate between the two fossil individuals, showing seasonal change in water temperature of 18.. Thus, there appears to be no significant difference in temperature seasonality between the. Late Pliocene (3.1 Ma) and the present in Tosa Bay.. Qu`: \oNYvdkSqĉšƥ{űƺ´ŖŋÖƭţşĿʼn Keyword: Meretrix lamarcki, oxygen isotope ratios, seasonality, Ananai Formation, Pliocene. 1.

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