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Ultra-high-resolution stable isotope sampling of slow-growing and fragile coral skeletons

机译：超高分辨率稳定同位素采样缓慢生长和脆弱的珊瑚骨架

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The calcareous (CaCO_3) skeleton of massive scleractinian corals represents a reliable archive for environmental proxy data. Stable carbon and oxygen isotope records built from series of powder samples drilled along the axis of maximum growth represent the backbone of most coral sclerochronologies. Because isotope analyses require a certain minimum amount of sample powder, commonly used drill bit diameters are ≥400 μm. In order to achieve monthly (or higher) sampling resolution, annual upward growth of the corals must therefore exceed 5 mm. While this threshold represents no limitation for most coral sclerochronologies of massive corals from the tropics, it hampers the preparation of significant datasets from slow-growing and delicate corals from subtropical and temperate regions and the fossil record. Here, we present a modified milling technique, which allows sampling carbonate powder from slow-growing, very porous and delicate corals with a minimum spatial resolution of 50 /ira. By using dental composite resin as a stabilising medium in combination with a newly developed mounting apparatus, accurate high-resolution sampling along straight growth axes becomes feasible. With two case studies, we demonstrate applications of this method to two different kinds of slow-growing corals: A recent phaceloid Cladocora caespitosa from the Columbretes Islands (Spain, Mediterranean Sea) and a middle Miocene massive Porites sp. from the Vienna Basin (Austria, Central Paratethys Sea). Compared to conventional milling-based methods, the modified sampling design allows minimizing averaging effects caused by the integration over skeletal elements formed at different times, and enhancing the highest spatial resolution hitherto achieved by factor 1.5 for Porites and even factor 4 for Cladocora. In this respect, the herein presented method represents a significant step forward for exploring also sub-annually resolved proxy time-series from slow-growing and delicate corals (extant and fossil), thus allowing the broadening of sclerochronology to so far underexplored environmental coral archives.
机译：大规模核心珊瑚珊瑚的钙质（Caco_3）骨架代表了环境代理数据的可靠档案。由沿着最大增长轴钻的一系列粉末样品构建的稳定的碳和氧同位素记录代表大多数珊瑚核心的骨干。因为同位素分析需要某个最小量的样品粉末，所以常用的钻头直径≥400μm。为了实现每月（或更高）的抽样解决，因此珊瑚的年向上增长必须超过5毫米。虽然该阈值对于来自热带的大多数珊瑚核心核心量没有限制，但它妨碍了从亚热带和温带地区和化石记录的缓慢生长和精致珊瑚的重要数据集。在这里，我们介绍了一种改性铣削技术，它允许从缓慢生长，非常多孔和精致的珊瑚中取样，具有50 / IRA的最小空间分辨率。通过使用牙科复合树脂作为稳定介质与新开发的安装装置组合使用，沿着直的生长轴的精确高分辨率取样变得可行。通过两种案例研究，我们向两种不同种类的缓慢种植珊瑚证明了这种方法的应用：来自苏姆布雷斯群岛（西班牙，地中海）和中间内部普通柱SP的近期磷依裂氏植物癌菌。来自维也纳盆地（奥地利，中央ParateShys海）。与基于常规的铣削的方法相比，改进的采样设计允许最小化由在不同时间形成的骨骼元件上的集成引起的平均效果，并且增强了迄今为止迄今为止的最高空间分辨率，以便为普罗茨为普罗茨甚至因子4而实现的迄今为止。在这方面，本文呈现的方法代表了从生长缓慢和精致珊瑚（现存和化石）的次每年探索的重要步骤，从而允许到目前为止未引人注目的环境珊瑚档案拓展。

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  • 来源
    《Oceanographic Literature Review》 |2020年第10期|2158-2158|共1页
  • 作者

    P. Spreter; M. Reuter; T.C. Brachert; D.K. Kersting;

  • 作者单位

    Institut fuer Geophysik und Geologie Universitaet Leipzig Talstrasse 35 Leipzig 04103 Germany;

    Institut fuer Geophysik und Geologie Universitaet Leipzig Talstrasse 35 Leipzig 04103 Germany;

    Institut fuer Geophysik und Geologie Universitaet Leipzig Talstrasse 35 Leipzig 04103 Germany;

    Institut fuer Geophysik und Geologie Universitaet Leipzig Talstrasse 35 Leipzig 04103 Germany;

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