δ18O values of coexisting brachiopods and fish: Temperature differences and estimates of paleo–water depths
δ18O values of coexisting brachiopods and fish: Temperature differences and estimates of paleo–water depths
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共存腕足动物和鱼类的 δ18O 值：温度差异和古水深度估计
DOI：
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发表时间：
1998
期刊：
影响因子：
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通讯作者：
C. Emig
中科院分区：
文献类型：
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作者：
S. Picard;Jean;C. Lécuyer;S. Sheppard;H. Cappetta;C. Emig
为了估计海洋平台的垂直热梯度和古水深，我们提出了一种基于同时期腕足动物碳酸盐岩和鱼类磷酸盐δ 18o值差异的新方法。从表面到海底，已知生态的现代海洋动物群记录的同位素温度与测量温度一致。我们预测了采样策略、盆地形态和动物生态导致的同位素数据分布，并讨论了局限性。将该方法应用于侏罗纪巴黎-伦敦盆地，可以得到深度从几米到170±30米的垂直温度变化，最高可达14°C。估计的深度是最小值，并且大于该古陆表海的沉积学标准估计的深度。
To estimate vertical thermal gradients and paleo–water depths to marine platforms we present a new method based on the difference between δ 18 O values of contemporaneous brachiopod carbonate and fish phosphate. Present-day marine fauna of well-known ecology from the surface to the sea floor record isotopic temperatures that agree with measured temperatures. We predict distributions of isotopic data that result from sampling strategy, basin morphology, and fauna ecology and discuss limitations. Application of the method to the Jurassic Paris-London basin gives vertical thermal variations of up to 14 °C associated with depths varying from a few meters to 170 ± 30 m. The estimated depths are minimum values and are greater than those estimated from sedimentological criteria for this ancient epicontinental sea.