Growth Kinetics and Distribution of Trace Elements in Precious Corals
Growth Kinetics and Distribution of Trace Elements in Precious Corals
复制标题
DOI：
10.3389/feart.2018.00167
复制
发表时间：
2018-10-18
影响因子：
2.9
通讯作者：
Floquet, Nicole
中科院分区：
文献类型：
--
作者：
Vielzeuf, Daniel;Gagnon, Alexander C.;Floquet, Nicole
研究了不同珊瑚骨骼中常量元素（Ca、Mg）和微量元素（Na、Sr、S、Li、Ba、Pb和U）的含量和空间分布。rubrum、红毛隐翅虫C. japonicum、日本刺蛾C. elatius、C. konojoi）进行了研究电子探针（EMP）和激光烧蚀电感耦合等离子体质谱（LA-ICPMS）。EMP数据显示所有骨骼中的Na-Mg正相关和Na-S和Mg-S负相关。LA-ICPMS数据显示了额外的Sr-Mg、Li-Mg和U-Mg正相关。骨髓区的骨骼，对应于快速增长区，是系统丰富的镁，钠，锶，锂，和U和贫S比周围的缓慢增长区。这些空间分布主要根据生长动力学结合影响生物成因方解石中杂质掺入的空间效应来解释。这种解释是在协议与现有的实验数据的动力学效应的元素在方解石中的结合。在不同的尺度上，环形缓慢生长带的年轮中Mg、Na、Sr和S的含量都有振荡。这些化学振荡可能是由于生长速率的变化：快速生长会产生富含Mg，Sr和Na的环，而缓慢生长会产生富含Ca，S和有机物的环。根据以往的研究，在C。在红层中，富Mg环在春秋季形成，富S环在秋末和冬季形成。在不同的珊瑚骨骼的环形区进行分析遍历表明，镁，钠，锶，锂，和U减少从核心到边缘。这一观察结果表明，径向生长速率随着殖民地变老而降低。相反，镁，钠，锶，锂，硫，和U，钡和铅的浓度是相同的髓和环形区，并出现独立的生长动力学。因此，珊瑚骨骼中的浓度可以提供海洋中Ba和Pb含量的指示。地中海珍贵珊瑚中钡和铅的含量高于太平洋珍贵珊瑚，这两种元素可用于鉴别C。rubrum从C. japonicum，并有助于执行对珍贵珊瑚贸易的规定。
The concentration and spatial distribution of major (Ca, Mg) and trace elements (Na, Sr, S, Li, Ba, Pb, and U) in different Corallium skeletons (C. rubrum, C. japonicum, C. elatius, C. konojoi) have been studied by electron microprobe (EMP) and laser ablation inductively coupled plasma mass spectrometry (LA-ICPMS). EMP data show positive Na-Mg and negative Na-S and Mg-S correlations in all skeletons. LA-ICPMS data display additional Sr-Mg, Li-Mg, and U-Mg positive correlations. Medullar zones in the skeletons, corresponding to fast growing zones, are systematically richer in Mg, Na, Sr, Li, and U and poorer in S than the surrounding slow growing zones. These spatial distributions are mostly interpreted in terms of growth kinetics combined with steric effects influencing the incorporation of impurities in biogenic calcites. This interpretation is in agreement with available experimental data on kinetic effects on the incorporation of elements in calcite. At a different scale, annual growth rings in annular slow growing zones show oscillations in Mg, Na, Sr, and S. These chemical oscillations probably result from growth rate variations: fast growth would produce rings enriched in Mg, Sr, and Na, while slow growth would produce rings enriched in Ca, S and organic matter. From previous studies in C. rubrum, the Mg-rich rings would develop during the spring to fall period while the S-rich rings would form immediately after (late fall and winter). Analytical traverses performed in annular zones of different Corallium skeletons indicate that Mg, Na, Sr, Li, and U decrease from core to rim. This observation indicates that radial growth rate decreases as the colony gets older. Contrary to Mg, Na, Sr, Li, S, and U, barium and lead concentrations are identical in medullar and annular zones and appear independent of growth kinetics. Thus, concentrations in Corallium skeletons could provide indications on Ba and Pb contents in the oceans. Barium and lead concentrations are higher in Mediterranean than in Pacific precious corals, these two elements can be used to discriminate C. rubrum from C. japonicum, and contribute enforcing regulations on the trade of precious corals.