Bioturbation plays a critical role in sediment mixing and biogeochemical cycling between sediment and seawater. An abundance of bioturbation structures, dominated by Thalassinoides, occurs in carbonate rocks of the Cambrian Series 2 Zhushadong Formation in the Dengfeng area of western Henan Province, North China. Determination of elemental geochemistry can help to establish the influence of burrowing activities on sediment biogeochemical cycling, especially on changes in oxygen concentration and nutrient regeneration. Results show that there is a dramatic difference in the bioturbation intensity between the bioturbated limestone and laminated dolostone of the Zhushadong Formation in terms of productivity proxies (Ba ex , Cu, Ni, Sr/Ca) and redox proxies (V/Cr, V/Sc, Ni/Co). These changes may be related to the presence of Thalassinoides bioturbators, which alter the particle size and permeability of sediments, while also increase the oxygen concentration and capacity for nutrient regeneration. Comparison with modern studies shows that the sediment mixing and reworking induced by Thalassinoides bioturbators significantly changed the primary physical and chemical characteristics of the Cambrian sediment, triggering the substrate revolution and promoting biogeochemical cycling between sediment and seawater.

中文翻译：

---

河南登封地区下寒武统竹沙洞组海藻生物扰动

生物扰动在沉积物与海水之间的沉积物混合和生物地球化学循环中起着至关重要的作用。豫西登封地区寒武系2朱沙洞组碳酸盐岩中发育丰富的生物扰动构造，以海藻为主导。元素地球化学的测定有助于确定穴居活动对沉积物生物地球化学循环的影响，特别是对氧浓度和养分再生的变化。结果表明，珠沙东组生物扰动灰岩和层状白云岩的生物扰动强度在生产力指标（Ba ex 、Cu、Ni、Sr/Ca）和氧化还原指标（V/Cr、V/ Sc，镍/钴）。这些变化可能与 Thalassinoides 生物扰动器的存在有关，它们改变了沉积物的粒径和渗透性，同时也增加了氧气浓度和养分再生能力。与现代研究对比表明，海藻生物扰动器引起的沉积物混合和再加工显着改变了寒武系沉积物的主要物理和化学特征，引发了底物革命，促进了沉积物与海水之间的生物地球化学循环。