Aggradation and carbonate accumulation of Holocene Norwegian cold‐water coral reefs
Aggradation and carbonate accumulation of Holocene Norwegian cold‐water coral reefs
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全新世挪威冷水珊瑚礁的沉积作用和碳酸盐堆积
DOI：
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
A. Freiwald
中科院分区：
文献类型：
--
作者：
J. Titschack;D. Baum;R. De Pol‐Holz;M. López Correa;Nina Forster;S. Flögel;D. Hebbeln;A. Freiwald
冷水珊瑚生态系统代表着大西洋大陆边缘常见的碳酸盐工厂，在那里它们可以形成大型珊瑚礁结构。关于它们的生态学、分子遗传学、环境控制和威胁的知识越来越多。然而，关于它们的碳酸盐生产和积累的信息仍然非常有限，尽管这些信息对于它们作为碳酸盐汇的评估是必不可少的。这项研究的目的是提供挪威冷水珊瑚礁不同环境(Sunds、内陆架和陆架边缘)的高分辨率珊瑚礁沉积和碳酸盐累积速率。此外，还介绍了一种利用CT分析评价冷水珊瑚沉积物中冷水珊瑚保存性的新方法。这种方法允许根据其宏观化石碎屑大小和方位特征来区分各种冷水珊瑚沉积。结果表明，较高的珊瑚礁沉积率有利于冷水珊瑚骨架的保存，而适中的珊瑚礁沉积率有利于珊瑚碎屑的保存。宏观化石的高度碎片化表明存在浓缩的区间或不整合面。到目前为止，在冷水珊瑚礁观测到的高达1500厘米的KYR−1的沉积速率是最高的。研究岩心内的生物礁堆积仅限于全新世早期和晚期。挪威冷水珊瑚的现有年代数据支持其他峡湾的这种年龄模式，而在大陆架上，冷水珊瑚的年龄是从中全新世早期开始额外报告的。获得的平均碳酸盐累积速率高达103g cm−2KYR−1，比以前对冷水珊瑚礁的估计高出两到三倍，对邻近的沉积环境(陆架、斜坡和深海)几乎高出一个数量级。只有局部峡湾盆地在冷水珊瑚礁范围内表现出碳酸盐堆积速率。此外，冷水珊瑚礁碳酸盐堆积速率在热带珊瑚礁碳酸盐堆积速率范围内。这些结果清楚地表明，冷水珊瑚礁作为局部碳酸盐汇的重要性，可能是区域性的，也可能是全球的。
Cold‐water coral ecosystems present common carbonate factories along the Atlantic continental margins, where they can form large reef structures. There is increasing knowledge on their ecology, molecular genetics, environmental controls and threats available. However, information on their carbo‐nate production and accumulation is still very limited, even though this information is essential for their evaluation as carbonate sinks. The aim of this study is to provide high‐resolution reef aggradation and carbonate accumulation rates for Norwegian cold‐water coral reefs from various settings (sunds, inner shelf and shelf margin). Furthermore, it introduces a new approach for the evaluation of the cold‐water coral preservation within cold‐water coral deposits by computed tomography analysis. This approach allows the differentiation of various kinds of cold‐water coral deposits by their macrofossil clast size and orientation signature. The obtained results suggest that preservation of cold‐water coral frameworks in living position is favoured by high reef aggradation rates, while preservation of coral rubble prevails by moderate aggradation rates. A high degree of macrofossil fragmentation indicates condensed intervals or unconformities. The observed aggradation rates with up to 1500 cm kyr−1 exhibit the highest rates from cold‐water coral reefs so far. Reef aggradation within the studied cores was restricted to the Early and Late Holocene. Available datings of Norwegian cold‐water corals support this age pattern for other fjords while, on the shelf, cold‐water coral ages are reported additionally from the early Middle Holocene. The obtained mean carbonate accumulation rates of up to 103 g cm−2 kyr−1 exceed previous estimates of cold‐water coral reefs by a factor of two to three and by almost one order of magnitude to adjacent sedimentary environments (shelf, slope and deep sea). Only fjord basins locally exhibit carbonate accumulation rates in the range of the cold‐water coral reefs. Furthermore, cold‐water coral reef carbonate accumulation rates are in the range of tropical reef carbonate accumulation rates. These results clearly suggest the importance of cold‐water coral reefs as local, maybe regional to global, carbonate sinks.
分支珊瑚 Acropora pulchra 顶端孔隙度和骨骼元素特征的空间变化（Brook 1891）
影响因子：
3.5
作者：
Roche R
通讯作者：
Roche R
DOI：
10.1111/j.1439-0485.2010.00359.x
发表时间：
2010-03-01
影响因子：
1.1
作者：
Buhl-Mortensen, Lene;Vanreusel, Ann;Raes, Maarten
通讯作者：
Raes, Maarten
毛里塔尼亚附近冷水珊瑚丘的沉积模式
DOI：
10.1016/j.dsr2.2013.07.004
发表时间：
2013
影响因子：
3
作者：
Eisele M;Frank N;Wienberg C;Titschack J;Mienis F;Beuck L;Tisnerat‐Laborde N;Hebbeln D
通讯作者：
Hebbeln D