Growth of north-east Atlantic cold-water coral reefs and mounds during the Holocene: A high resolution U-series and 14C chronology
Growth of north-east Atlantic cold-water coral reefs and mounds during the Holocene: A high resolution U-series and 14C chronology
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DOI：
10.1016/j.epsl.2013.05.023
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发表时间：
2013-08-01
影响因子：
5.3
通讯作者：
Roberts, J. Murray
中科院分区：
文献类型：
--
作者：
Douarin, Melanie;Elliot, Mary;Roberts, J. Murray
我们用U系列和放射性碳测年方法研究了苏格兰西部近海冷水珊瑚礁的海景--明古拉礁复合体的全新世生长历史。这两个年表都揭示了在全新世晚期，珊瑚礁骨架形成的珊瑚Lophelia pertusa的幕式发生。Downcore U系列测年显示，史无前例的珊瑚礁生长速度高达12 mm a(-1)，平均速度为3-4 mm a(-1)。我们的研究强调了珊瑚出现的持续中断，从1.4ka到现代，尽管目前的条件有利于珊瑚的生长。该杂岩的生长历史至少有两次被增长率降低的时期打断：1.75-2.8ka、3.2-3.6ka，以及较小程度的3.8-4ka和4.2ka。明古莱珊瑚休止期和珊瑚礁生长率下降的时间与整个北欧区域的情况是同步的，这表明这些生态系统与与北大西洋亚极地环流变化有关的古环境制度的大范围变化之间存在密切关系。皇冠版权所有(C)2013由Elsevier B.V.出版。保留所有权利。
We investigated the Holocene growth history of the Mingulay Reef Complex, a seascape of inshore cold-water coral reefs off western Scotland, using U-series and radiocarbon dating methods. Both chronologies revealed episodic occurrences of the reef framework-forming scleractinian coral Lophelia pertusa during the late Holocene. Downcore U-series dating revealed unprecedented reef growth rates of up to 12 mm a(-1) with a mean rate of 3-4 mm a(-1). Our study highlighted a persistent hiatus in coral occurrence from 1.4 ka to modern times despite present day conditions being conducive for coral growth. The growth history of the complex was punctuated at least twice by periods of reduced growth rates: 1.75-2.8 ka, 3.2-3.6 ka and to a lesser extent at 3.8-4 ka and at 4.2 ka. Timing of coral hiatuses and reduced reef growth rates at Mingulay were synchronous with those occurring across the wider northern European region, which suggests a close relationship between these ecosystems and large-scale shifts in palaeoenvironmental regimes associated with changes to the North Atlantic subpolar gyre. Crown Copyright (c) 2013 Published by Elsevier B.V. All rights reserved.