钙华非经典沉积的纳米生长过程与调控机制初探——以九寨沟—黄龙钙华形成为例

钙华是自然界重要的岩溶碳酸盐沉淀之一，其形成过程往往受到生命活动的影响，弄清钙华生物沉积作用有助于更好地理解钙华微岩相结构和地球化学特征的气候环境指示意义。本文以黄龙-九寨沟钙华形成为例，阐述黄龙-九寨沟现代钙华纳米结晶特征、纳米钙华的生长和集合体形态，分析模拟实验中生物有机质对钙华生长和形貌的调控原因，揭示了生物活动和代谢产物对纳米钙华成核、生长及钙华晶体形貌的调控两途径四阶段机制；为探究钙华成因、碳酸钙生长调控机制、钙华退化的因素及其保护和可持续利用钙华景观具有重要的科学价值。 

Preliminary study on nanometer growth process and regulatory mechanism of travertine nonclassical deposition- A case study of travertine in Jiuzhaigou valley and Huanglong region

Travertine is one of the important karst carbonate precipitates in nature， and its formation process is often affected by life activities. Clarifying the role of travertine biodeposition can help to better understand the climatic and environmental implications of travertine petrographic and geochemical characteristics. Taking travertine in Jiuzhaigou and Huanglong region as example， the characteristics of modern travertine nanocrystalline， the growth and aggregate morphology of travertine in Huanglong and Jiuzhaigou are described. The reasons for the regulation of the growth and morphology of travertine by biological organic matter in simulated experiments was analyzed， and the two-way and four-stage mechanism of biological activity and metabolites regulating the nucleation， growth and crystal appearance of travertine crystals was revealed.This paper is of great scientific value to explore the cause of the formation of travertine， the regulation mechanism of the growth of calcium carbonate，the degradation factors of travertine， and the protection and sustainable utilization of the travertine landscape.