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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Calibrations for benthic foraminiferal Mg/Ca paleothermometry and the carbonate ion hypothesis
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Calibrations for benthic foraminiferal Mg/Ca paleothermometry and the carbonate ion hypothesis

机译：底栖有孔虫Mg / Ca古温度计的校准和碳酸盐离子假说

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Benthic foraminiferal magnesium/calcium ratios were determined on one hundred and forty core-top samples from the Atlantic Ocean, the Norwegian Sea, the Indian Ocean, the Arabian Sea and the Pacific Ocean, mostly at sites with bottom water temperatures below 5 degrees C. Mg/Ca ratios are consistently lower, by similar to 0.2 mmol/mol, in samples cleaned using oxidative and reductive steps than using oxidative cleaning. Differences between Cibicidoides species have been identified: Mg/Ca of Cibicidoides robertsonianus>Cibicidoides kullenbergi>Cibicidoides wuellerstorfi. Comparison with bottom water temperatures support observations of lowered Mg/Ca of C. wuellerstorfi at temperature below similar to 3 degrees C compared with values predicted by published calibrations and from other Cibicidoides species. Hydrographic data shows that carbonate ion saturation (Delta[CO32-]) decreases rapidly below this temperature. An empirical sensitivity of Delta[CO32-] on Mg/Ca has been established for C. wuellerstorfi of 0.0086 +/- 0.0006 mmol/mol/mu mol/kg. A novel application using modem temperatures and Last Glacial Maximum temperatures derived via pore fluid modelling supports a carbonate ion saturation state effect on Mg incorporation. This may significantly affect calculated delta O-18(seawater) obtained from foraminiferal delta O-18 and Mg/Ca temperature. (c) 2006 Elsevier B.V. All rights reserved.
机译：在大西洋，挪威海，印度洋，阿拉伯海和太平洋的140个岩心顶样品上确定了底栖有孔虫的镁/钙比，主要是在底水温度低于5摄氏度的地点进行的。在使用氧化和还原步骤清洁的样品中，与使用氧化清洁方法相比，Mg / Ca比值始终较低，约低至0.2 mmol / mol。已鉴定出刺柏亚种之间的差异：罗氏刺柏（Cibicidoides robertsonianus）>库氏白屈菌（Cibicidoides kullenbergi）>乌勒氏菌（Cibicidoides wuellerstorfi）的镁/钙。与底部水温的比较支持观察到，在低于约3摄氏度的温度下，乌勒氏梭菌的Mg / Ca降低，与已公布的校准值和其他Cibicidoides物种预测的值相比。水文数据表明，在此温度以下，碳酸根离子饱和度（Delta [CO32-]）迅速降低。已经建立了对于乌氏梭菌的0.0086 +/- 0.0006mmol / mol /μmol/ kg的Δ[CO32-]对Mg / Ca的经验敏感性。使用现代温度和通过孔隙流体模型得出的最后冰期最高温度的新型应用支持碳酸根离子饱和状态对镁的引入的影响。这可能会严重影响从有孔虫δO-18和Mg / Ca温度获得的计算δO-18（海水）。 （c）2006 Elsevier B.V.保留所有权利。

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