陕南寒武系底部宽川铺组不仅保存了大量的小壳化石, 还以磷酸盐化的方式立体保存了多种软躯体动物的胚胎和成体化石, 为研究早期动物矿化模式、个体发育方式以及动物躯体构型的早期辐射过程提供了非常关键的信息。然而宽川铺生物群的研究大多聚焦于化石系统分类及亲缘关系探索, 对生物群的沉积背景、埋藏过程和保存模式的分析甚少。本文以宽川铺生物群的核心产出层位——陕西省西乡县大河镇宽川铺组下部磷质碎屑灰岩为研究对象, 对其中的一类管状化石圆管螺及其围岩进行了显微结构学和显微谱学综合分析, 获得了化石显微结构和关键结构对应的元素、矿物成份等信息, 讨论了管状化石圆管螺的埋藏过程和保存模式, 并在此基础上对其生物学特征进行了初步探讨。该研究对理解宽川铺生物群的埋藏机制提供了新的线索。
The early Cambrian Kuanchuanpu Formation in south Shaanxi Province yields not only abundant phosphatized small shelly fossils, but also various soft-bodied animals at embryonic and adult stages with three-dimensional preservation, providing a crucial taphonomic window to explore the diversity of biomineralization of early metazoans, the early evolution of develop-ment of metazoans, as well as the early evolutionary radiation process of metazoan body plans. However, the majority of previous investigations on the Kuanchuanpu Biota have been focusing on phylogenetic affinities of animal fossils, detailed taphonomic analyses of post-mortem and diagenetic processes are relatively rare. In this study, we targeted the host rocks of the Kuanchuanpu biota, phosphatic limestones from the Kuanchuanpu Formation in Dahe Town, Xixiang County, Shaaxi Province, and conducted comprehensive microscopic and spectroscopic analyses on the microtubular fossils and the rock matrix. The results including information of spatial distribution of elements and minerals within microtubular fossils and rock matrix, spatial distribution of microtubular fossils within the rock, as well as microstructures of the microtubular fossils, provide new insights not only into the biology of these microtubular fossils, but also the preservation mechanism of the Kuanchuanpu biota.