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云开地块位于广东和广西两省的毗邻地带，经历了基底形成和改造两个阶段。基底形成包括了古中元古代高州杂岩的沉积与变质、晚元古代云开群的沉积与变质、震旦系和早古生代地层的沉积和变质，在早古生代晚期作为整体转化为稳定地块。基底改造发生在加里东期之后，包括海西－印支期与燕山－喜山期两个阶段，基底岩石经历了断裂变质、重熔改造和构造活动。在基底演化过程中，物质进行了重新分布，一些元素得以富集成矿，使云开地区成为我国重要的银金-多金属矿床集中区。
Located in the adjacent area between Guangdong and Guangxi provinces, Yunkai Plot has undergone two phases of basement formation and transformation. The basement formation includes the sedimentation and metamorphism of the Paleoproterozoic Gaozhou complex, the sedimentation and metamorphism of the Late Proterozoic Yunkai Group, the sedimentation and metamorphism of the Sinian and Early Paleozoic strata, and the transformation into a stable mass in the early Paleozoic as a whole . The basement alteration occurred after the Caledonian period, including the two phases of Hercynian-Indosinian and Yanshan-Himalayan periods. The basement rocks underwent faults metamorphism, remelting and tectonic activities. During the evolution of the basement, the matter is redistributed and some elements are enriched for mineralization, making the Yunkai area an important silver-gold-polymetallic deposit concentration area in China.