Biostratinomic analysis of Lycoptera beds from the Early Cretaceous Yixian Formation, western Liaoning, China
Biostratinomic analysis of Lycoptera beds from the Early Cretaceous Yixian Formation, western Liaoning, China
复制标题
DOI：
10.1111/pala.12160
复制
发表时间：
2015-05
期刊：
影响因子：
2.6
通讯作者：
Yan-Hong Pan;F. Fürsich;Jiangyong Zhang;Yaqiong Wang;Xiaoting Zheng
中科院分区：
文献类型：
--
作者：
Yan-Hong Pan;F. Fürsich;Jiangyong Zhang;Yaqiong Wang;Xiaoting Zheng
对辽西早白垩世湖泊的古环境知之甚少。特别是在水深、水温和年温度波动方面存在不确定性。在这里，我们分析了湖泊中最丰富的鱼类--硬骨石龙鱼的保存情况，这些硬骨鱼的铰接骨骼大量出现，暗示着大规模死亡。骨骼元素的脱节程度、取向模式和移位等节理特征显示出明显的保存模式。它们表明，冬季水温较低，并表现出明显的季节性波动。湖的深度并不深。讨论了鱼类死亡的可能原因，其中以缺氧为主。这导致了这些古湖更精确的古环境模型，这些古湖是最重要的中生代拉格斯特湖之一的港湾。
Little is known about the palaeoenvironments of the Early Cretaceous lakes of western Liaoning. Uncertainties exist especially about the water depth, water temperatures and annual temperature fluctuations. Here, we analyse the preservation of the most abundant fish of the lakes, the teleost Lycoptera, articulated skeletons of which occur in large concentrations suggestive of mass mortality. Taphonomic features such as degree of disarticulation, orientation patterns and displacement of skeletal elements reveal distinct preservational patterns. They suggest that the water temperature was low during winter and exhibited pronounced seasonal fluctuations. The depth of the lakes was not deep. Possible causes of the fish mortality are discussed, of which anoxia is favoured. This leads to a more refined palaeoenvironmental model for these palaeolakes, which harbour one of the most important Mesozoic Lagerstätten.