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首页> 外文OA文献 >Stable isotope (δ18O and δ13C) sclerochronology of Callovian (Middle Jurassic) bivalves (Gryphaea (Bilobissa) dilobotes) and belemnites (Cylindroteuthis puzosiana) from the Peterborough Member of the Oxford Clay Formation (Cambridgeshire, England): Evidence of palaeoclimate, water depth and belemnite behaviour
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Stable isotope (δ18O and δ13C) sclerochronology of Callovian (Middle Jurassic) bivalves (Gryphaea (Bilobissa) dilobotes) and belemnites (Cylindroteuthis puzosiana) from the Peterborough Member of the Oxford Clay Formation (Cambridgeshire, England): Evidence of palaeoclimate, water depth and belemnite behaviour

机译：来自牛津粘土地层的彼得伯勒成员（英格兰剑桥郡）的卡洛维（中侏罗世）双壳类（Gryphaea（Bilobissa）双叶类）和贝兰尼特（Cylindroteuthis puzosiana）的稳定同位素年代学（δ18O和δ13C）：贝伦石行为

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Incremental δ18O and δ13C signals were obtained from three well-preserved specimens of Cylindroteuthis puzosiana and from three well-preserved specimens of Gryphaea (Bilobissa) dilobotes from the Peterborough Member of the Oxford Clay Formation (Cambridgeshire, England). Through-ontogeny (sclerochronological) δ18O data from G. (B.) dilobotes appear to faithfully record seasonal temperature variations in benthic Callovian waters of the study area, which range from c. 14 °C to c. 17 °C (arithmetic mean temperature c. 15 °C). Water depth is estimated to have been in the region of c. 50 m, based upon comparisons between these data, previously published non-incremental sea surface δ18O values, and a modern analogue situation. Productivity in Callovian waters was comparable with that in modern seas, based upon δ13C data from G. (B.)dilobotes, with 13C depletion occurring during warmer periods, possibly related to an interaction between plankton blooms and intra-annual variations in mixing across a thermocline. Incremental δ18O data from C.puzosiana provide temperature minima of c.11 °C for all specimens but with maxima varying between c.14 °C and c.16 °C for different individuals (arithmetic mean values c. 13 °C). Temperatures for late ontogeny, when the C. puzosiana individuals must have been living close to the study site and hence the analysed specimens of G. (B.) dilobotes, are closely comparable to those indicated by the latter. However, for significant portions of ontogeny C. puzosiana experienced temperatures between c. 2 °C and c. 3 °C cooler than the winter minimum as recorded by co-occurring G. (B.) dilobotes. Comparisons with modern seas suggest that descent to a depth of c. 1000 m would be necessary to explain such cool minimum temperatures. This can be discounted due to the lack of deep waters locally and due to estimates of the depth tolerance of belemnites. The most likely cause of cool δ18O signals from C. puzosiana is a cosmopolitan lifestyle including migration to more northerly latitudes. Mean δ13C values from C. puzosiana are comparable with those from G.(B.)dilobotes. However, the incrementally acquired data are highly variable and probably influenced by metabolic effects.The probable identification of migratory behaviour in C. puzosiana calls into question the reliability of some belemnite species as place-specific palaeoenvironmental archives and highlights the benefits of adopting a sclerochronological approach.
机译：增量δ18O和δ13C信号是从三个保存完好的Cylindroteuthis puzosiana标本和三个保存完好的从牛津黏土地层的Peterborough成员（英格兰剑桥郡）的Gryphaea（Bilobissa）双叶标本中获得的。来自G.（B.）双叶虫的贯穿个体发育（年代记述）的δ18O数据似乎忠实地记录了研究区域底栖卡洛夫水域的季节性温度变化，范围从c。 14°C至c。 17°C（算术平均温度c。15°C）。估计水深在c左右。根据这些数据之间的比较，先前公布的非增量海面δ18O值和现代模拟情况，得出50 m。根据G.（B.）双叶生物的δ13C数据，卡洛夫河水域的生产力与现代海洋相当，在较暖的时期发生13C损耗，这可能与浮游生物的开花和跨海混合的年内变化之间的相互作用有关。温跃层。来自C.puzosiana的增量δ18O数据为所有样品提供了约11°C的最低温度，但不同个体的最大值在约14°C和约16.C之间变化（算术平均值为约13°C）。后期个体发育的温度，当C. puzosiana个人必须一直生活在研究地点附近，因此所分析的G.（B.）双叶植物标本与后者所表明的温度具有可比性。但是，对于个体发育显着的部分，C。puzosiana的温度在c之间。 2°C和c。根据共同出现的G.（B.）双叶植物记录，比冬季最低温度低3°C。与现代海洋的比较表明下降到c深度。需要1000 m来解释这样凉爽的最低温度。由于当地缺乏深水，并且由于估计了贝留尼姆的深度耐受性，因此可以不予考虑。来自Puzosiana的δ18O信号凉爽的最可能原因是国际化的生活方式，包括向更北纬的地区迁移。来自C. puzosiana的平均δ13C值与来自G.（B。）双叶植物的δ13C值相当。但是，增量获取的数据变化很大，可能受代谢影响。美洲豹C游移行为的可能识别使人们怀疑某些贝朗石物种作为特定地点的古环境档案的可靠性，并强调了采用年代学方法的好处。 。

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