Chemical labelling of oyster shells used for time-calibrated high-resolution Mg/Ca ratios: A tool for estimation of past seasonal temperature variations
Chemical labelling of oyster shells used for time-calibrated high-resolution Mg/Ca ratios: A tool for estimation of past seasonal temperature variations
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用于时间校准的高分辨率镁/钙比率的牡蛎壳化学标记：用于估计过去季节温度变化的工具
DOI：
10.1016/j.palaeo.2012.05.023
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
É. Verrecchia
中科院分区：
文献类型：
--
作者：
V. Mouchi;M. Rafélis;F. Lartaud;M. Fialin;É. Verrecchia
生物碳酸盐的地球化学成分越来越多地被用于古环境重建。骨骼δ18O的温度关系依赖于水的盐度，所以最近的许多研究都集中在镁/钙和锶/钙的比值上，因为这些比值在短时间尺度上变化不大。因此，在许多生物矿物中，这些元素比例被认为是良好的古温度指标，尽管它们在双壳类贝壳中的用途仍然不明确。在这里，我们介绍了两种现代牡蛎幼贝和成年牡蛎壳的高分辨率镁/钙比，长牡蛎和牡蛎。这些标本在受控条件下在两个不同的地点生长了一年多。贝壳的现场月度锰标记已用于日校准。用电子探针测量了贝壳中每日的镁/钙比。所有样品的镁/钙高频变化与月球周期具有良好的同步性，表明潮汐强烈地影响了镁/钙在贝壳中的结合。只有幼鱼样品的镁/钙比与海水温度的相关系数达到极显著水平(0.70R<；0.83，p<；0.0001)，而镁/钙结合的代谢控制和较低的贝壳生长速度排除了将成贝的镁/钙比用作古温度计的可能性。选择了两个研究地点的三个幼鱼贝壳的数据，建立了一个关系式：T=3.77 mg/Ca+1.88，其中T表示°C，Mg/Ca表示mmol/mol。
The geochemical compositions of biogenic carbonates are increasingly used for palaeoenvironmental reconstructions. The skeletal δ18O temperature relationship is dependent on water salinity, so many recent studies have focused on the Mg/Ca and Sr/Ca ratios because those ratios in water do not change significantly on short time scales. Thus, those elemental ratios are considered to be good palaeotemperature proxies in many biominerals, although their use remains ambiguous in bivalve shells. Here, we present the high-resolution Mg/Ca ratios of two modern species of juvenile and adult oyster shells, Crassostrea gigas and Ostrea edulis. These specimens were grown in controlled conditions for over one year in two different locations. In situ monthly Mn-marking of the shells has been used for day calibration. The daily Mg/Ca ratios in the shell have been measured with an electron microprobe. The high frequency Mg/Ca variation of all specimens displays good synchronism with lunar cycles, suggesting that tides strongly influence the incorporation of Mg/Ca into the shells. Highly significant correlation coefficients (0.70<R<0.83, p<0.0001) between the Mg/Ca ratios and the seawater temperature are obtained only for juvenile C. gigas samples, while metabolic control of Mg/Ca incorporation and lower shell growth rates preclude the use of the Mg/Ca ratio in adult shells as a palaeothermometer. Data from three juvenile C. gigas shells from the two study sites are selected to establish a relationship: T=3.77Mg/Ca+1.88, where T is in °C and Mg/Ca in mmol/mol.
大西洋东北部巨型深海牡蛎 Neopycnodonte zibrowii sp n 的壳结构、元素组成和稳定同位素特征
DOI：
10.1016/j.dsr.2008.10.002
发表时间：
2009
期刊：
影响因子：
--
作者：
Wisshak M;López Correa M;Gofas S;Salas C;Taviani M;Jakobsen J ;Freiwald A
通讯作者：
Freiwald A