Shell of the Great Scallop Pecten maximus as a high-frequency archive of paleoenvironmental changes -: art. no. Q08001
Shell of the Great Scallop Pecten maximus as a high-frequency archive of paleoenvironmental changes -: art. no. Q08001
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DOI：
10.1029/2004gc000890
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发表时间：
2005-08-02
影响因子：
3.5
通讯作者：
Mucciarone, D
中科院分区：
文献类型：
--
作者：
Chauvaud, L;Lorrain, A;Mucciarone, D
我们调查的环境和生物控制的氧同位素比值在现代Pecten maximus双壳类活在布雷斯特湾（法国）收集的贝壳。季节性三角洲O-18配置文件，通过钻孔的每日方解石脊沉积在表面的左阀，进行了比较，在现场测量的温度和盐度。我们发现，P. maximus三角洲O-18值准确地跟踪底层水温的季节变化。壳生长速率对壳Δ O-18值没有显著影响。我们的研究表明，水温的日变化可以在约0.5摄氏度内重建。用本研究建立的古温度方程估算的温度与以前发表的方程得出的温度进行了比较。比较表明，生物成因方解石最常用的古温度方程（Epstein等人，1953年）提供了不准确的温度估计，但Kim和O 'Neil（1997年）方程，建立了非生物成因的方解石沉淀，提供的结果非常类似于我们的，因此应该用于扇贝个体来自人口的适当的经验校准无法完成。Pecten maximus biblets沉淀方解石与海水的同位素平衡，产生大的日常生长条纹，是狭盐性的，并保存良好的考古和地质沉积，使他们成为一个很好的高频率的古环境变化档案。
We investigate the environmental and biological controls on oxygen isotope ratios in the shells of modern Pecten maximus bivalves collected alive in the Bay of Brest (France). Seasonal delta O-18 profiles, obtained by drilling the daily calcite ridges deposited at the surface of the left valve, were compared with in situ measurements of temperature and salinity. We show that P. maximus delta O-18 values accurately track seasonal variations in bottom water temperature. Shell growth rate has no significant effect on shell delta O-18 values. Our study demonstrates that daily variations in water temperature can be reconstructed within about 0.5 degrees C. Temperatures estimated with the paleotemperature equation established in this study were compared with temperatures derived from previously published equations. The comparison indicates that the most commonly used paleotemperature equation for biogenic calcite (Epstein et al., 1953) provides inaccurate temperature estimates, but the Kim and O'Neil (1997) equation, established from abiogenic calcite precipitation, provides results very similar to ours and should therefore be used for scallop individuals coming from populations where proper empirical calibration cannot be done. Pecten maximus bivalves precipitate calcite in isotopic equilibrium with seawater, produce large daily growth striae, are stenohaline, and are well preserved in archeological and geological deposits, making them an excellent high-frequency archive of paleoenvironmental change.