气候变化领域集成服务门户(CCPortal): Ultra-high-resolution stable isotope sampling of slow-growing and fragile coral skeletons

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DOI	10.1016/j.palaeo.2020.109992
	Ultra-high-resolution stable isotope sampling of slow-growing and fragile coral skeletons
	Spreter P.; Reuter M.; Brachert T.C.; Kersting D.K.
发表日期	2020
ISSN	0031-0182
卷号	560
英文摘要	The calcareous (CaCO3) 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 μm. 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. © 2020
英文关键词	Carbon isotopes; Cladocora; Micromilling; Oxygen isotopes; Palaeoclimatology; Porites
语种	英语
scopus关键词	biochronology; carbon isotope; coral; fossil record; historical record; oxygen isotope; proxy climate record; sampling; skeleton; spatial resolution; stable isotope; Anthozoa; Cladocora; Cladocora caespitosa; Porites; Scleractinia
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150311
作者单位	Institut für Geophysik und Geologie, Universität Leipzig, Talstraße 35, Leipzig, 04103, Germany; Institute of Geological Sciences, Freie Universität Berlin, Malteserstraße 74-100, Berlin, 12249, Germany; Departament de Biologia Evolutiva, Ecologia i Ciències Ambientals, Facultat de Biologia, Institut de Recerca de la Biodiversitat (IRBIO), Universitat de Barcelona, Avda. Diagonal 643, Barcelona, 08028, Spain
推荐引用方式 GB/T 7714	Spreter P.,Reuter M.,Brachert T.C.,et al. Ultra-high-resolution stable isotope sampling of slow-growing and fragile coral skeletons[J],2020,560.
APA	Spreter P.,Reuter M.,Brachert T.C.,&Kersting D.K..(2020).Ultra-high-resolution stable isotope sampling of slow-growing and fragile coral skeletons.Palaeogeography, Palaeoclimatology, Palaeoecology,560.
MLA	Spreter P.,et al."Ultra-high-resolution stable isotope sampling of slow-growing and fragile coral skeletons".Palaeogeography, Palaeoclimatology, Palaeoecology 560(2020).