Abstract

The genesis of dolomite is a century-old mystery in sedimentology. The ‘microbial dolomite model’ proposed in recent years provides new insight into the study of dolomite genesis. However, the lack of research on the precipitation rate makes it difficult to judge whether the microbial dolomite can be deposited as a thick dolomite formation alone. In this review, the precipitation rates (about 10⁻¹² to 10⁻⁹cm · s⁻¹) and productivity (about 1.3–7.9 × 10⁻⁷cm · s⁻¹) are estimated preliminarily, the results of cold seeps (10 ^−11.7 to 10 ^−12.5cm · s⁻¹) and previous modeling work (10^−11.8cm · s⁻¹) were collected, and the possible precipitation rates of ancient (6.1–7.5 × 10⁻¹¹cm · s⁻¹) and modern sabkha (5.9 × 10⁻¹⁰ to 1.3 × 10⁻⁹cm · s⁻¹) were calculated. To some extent, it does be possible that microbial dolomite can form a thick layer alone (because of the high productivity), but increasing order is a long process with the transformation of diagenesis. In terms of precipitation rate, there is less possibility in Sabkha, but more in cold seeps. The study on the precipitation rate of microbial dolomite may bring new enlightenment to the dolomite genesis and other fields, such as the reconstruction of paleoenvironment and study of the origin of life, but more elaborate culture experiments and modeling works are needed.

摘要

白云岩的成因是沉积学一个世纪的谜团。近年来提出的“微生物白云岩模型”为白云岩成因的研究提供了新的见识。然而，缺乏对沉淀速率的研究使得难以判断微生物白云石是否可以单独沉积为厚的白云岩地层。在这篇评论中，初步估算了降水速率（约10 ^-12至10 ^-9 cm·s ^-1）和生产力（约1.3–7.9×10 ^-7 cm·s ^-1），冷渗漏的结果（10 ^-11.7至10 ^-12.5 cm·s ^-1）和先前的建模工作（10 ^-11.8 cm·s ^-1）进行收集，古可能沉淀速率（6.1-7.5×10 ^-11厘米·S ^-1）和现代盐沼（5.9×10 ^-10〜1.3×10 ^-9厘米·秒^-1）进行了计算。在某种程度上，微生物白云石有可能单独形成一个厚层（由于高生产率），但是随着成岩作用的转变，增加阶数是一个漫长的过程。就降水率而言，萨布哈火山的可能性较小，而冷渗漏的可能性更大。对微生物白云石降水速率的研究可能会对白云岩的成因和其他领域，如古环境的重建和生命起源的研究等产生新的启示，但还需要进行更加精细的培养实验和建模工作。