西秦岭泥盆系的白云岩主要分布在碌曲—迭部地区,尤以下泥盆统尕拉组发育。由于这里的中、上泥盆统与下泥盆统的白云岩具有相似的沉积条件和成因类型,现选择具有代表性的下泥盆统尕拉组白云岩为例,对其沉积特征和成因进行讨论。在七十年代以前,白云岩之泻湖成因说占据了主导地位,随着现代海洋地质调查工作的进展,白云岩的泻湖成因说发生了动摇。在苏联的巴尔喀什东部阿拉库司湾浅水沉 The Devonian dolomites in West Qinling are mainly distributed in the Luqu-Diebu area, especially in the Devonian Formation of the Lower Devonian. Because the middle-upper Devonian and the Lower Devonian dolostones have similar sedimentary conditions and genetic types, the Lower Devonian dolomite of the Lower Devonian is selected as an example. Its sedimentary characteristics and genesis have a discussion. Before the 1970s, the cause of the lagoon in the Dolomites dominates. With the progress of the modern marine geological survey, the cause of the lagoon in the dolomites has been shaken. Shallow sinks in the mouth of the Aracluse Bay in eastern Balkhash, the Soviet Union