Tube structure and original composition of Sinotubulites:: shelly fossils from the late Neoproterozoic in southern Shaanxi, China
Tube structure and original composition of Sinotubulites:: shelly fossils from the late Neoproterozoic in southern Shaanxi, China
复制标题
中管岩的管状结构和原始成分：陕西南部新元古代晚期的贝壳化石
DOI：
10.1111/j.1502-3931.2007.00040.x
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发表时间：
2008-03-01
期刊：
影响因子：
1.5
通讯作者：
Yue, Zhao
中科院分区：
文献类型：
--
作者：
Chen, Zhe;Bengtson, Stefan;Yue, Zhao
陕西宁强晚新元古代灯影组上部产有丰富的保存完好的华管石贝壳化石。与共生的Cloudina壳的“漏斗中漏斗”结构不同，Sinotubulites的管是近圆柱形的，由几个薄层组成，具有“管中管”结构的特征。管体具有明显的纵向雕塑和/或不规则环纹，这些雕塑和/或环纹是由管体层的褶皱形成的，并且向内层逐渐减弱。外层不规则的褶皱装饰显示了Sinotubulites管的塑性特征，这可能进一步暗示生物分泌弹性和柔性的有机物占主导地位的壁，矿化，可能是文石。详细的薄片和扫描电镜研究表明，硅化发生早于磷块岩。湖北原位保存的华管虫标本及剖面的表面平行性和多边形特征表明，华管虫可能是以海底浅底生物的形式生活的。
Abundant well-preserved shelly fossils of Sinotubulites occur in the upper part of the late Neoproterozoic Dengying Formation in Ningqiang County, Shaanxi Province, China. Unlike 'funnel-in-funnel' structures of co-occurring Cloudina shells, the tube of Sinotubulites is nearly cylindrical, composed of several thin layers and characterized by 'tube-in-tube' structure. The tube bears prominent longitudinal sculptures and/or irregular annulations, which were formed by the wrinkles of tube layers, and weaken gradually towards the inner layers. The irregular wrinkle ornament of the outer layer shows plastic feature of the Sinotubulites tubes, which may further imply that the organisms secrete the elastic and flexible organic-dominated walls with mineralization, possibly aragonitic. Detailed thin section and SEM studies indicate that the silicification occurred earlier than phosphatation. Specimens preserved in situ from Hubei and surface ornamentation and polygonal shape of the cross-section suggest that Sinotubulites probably lived as an epibenthos lying on the sea floor.