The significance of geochemical proxies in corals, does size (age) matter?
The significance of geochemical proxies in corals, does size (age) matter?
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珊瑚中地球化学指标的重要性，大小（年龄）重要吗？
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
D. Hollander
中科院分区：
文献类型：
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作者：
T. Ourbak;K. Delong;H. Kilbourne;S. Caquineau;D. Hollander
本文的主要目标是确定大小（小与大珊瑚头）和年龄（青少年与成人）可能会影响珊瑚骨架中的地球化学指标，广泛用于古气候研究。在确定珊瑚没有受到成岩作用的影响后，对两个研究区的3个岩心进行了Sr/Ca、Mg/Ca、δ 18 O和δ 13 C的分析。我们比较了瓦努阿图相似环境中两种不同大小的珊瑚。较小的珊瑚头，尽管呈现出类似的季节性形状模式，其较大的对应物，提出较高的Sr/Ca，可能被解释为较冷的温度。我们还研究了顶部和基底的约7米高的大规模Porites sp.核心从新喀里多尼亚，揭示现代和后解决时期。地球化学指标在沉降后期有明显的演化。核心之间的差异似乎不太可能是由环境因素单独造成的，我们认为生物差异。这对化石研究很重要，因为珊瑚芯通常是以小块的形式回收的，没有年龄指数（成年或年轻）。地球化学重建应仔细解释为个体发育的影响，很容易偏差的结果。
The main goal of this paper is to determine how size (small vs. large coral heads) and age (juvenile vs. adult) potentially affect geochemical proxies in coral skeleton, widely used in paleoclimate studies. After ensuring that corals are not diagenetically altered, we analyse Sr/Ca, Mg/Ca, δ 18 O and δ 13 C on 3 cores from two study areas. We compare two different size corals from similar environmental setting in Vanuatu. The smaller coral head, despite presenting a similar seasonal shape pattern that its larger counterpart, presents higher Sr/Ca, potentially interpreted as cooler temperatures. We also study the top and the basement of a ~7m-high massive Porites sp. core from New Caledonia that reveal both modern and post-settlement periods. A sharp evolution of the geochemical proxies is seen during the post-settlement period. The differences in between the cores seem unlikely to be caused by environmental factors alone and we argue for biological differences. The implications are important for fossil studies where coral cores are often recovered in small pieces with no age indices (adult or young). Geochemical reconstructions should then be carefully interpreted as ontogenic effects could easily bias the results.
影响因子：
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作者：
E. Hendy;M. Gagan;J. Lough;M. McCulloch;P. deMenocal
通讯作者：
E. Hendy;M. Gagan;J. Lough;M. McCulloch;P. deMenocal