The production of basalt is characterized by two types of eruptions.
Fissure eruptions
Often forming large areas of flood basalt, fissure eruption channels often manifest as groups of walls of similar composition to basalt, but they are often buried by later flows and not easily found. The Emei Mountain basalt, which was formed in the Late Permian and covers an area of about 260,000 km2, is generally 600-1500 m thick, with a thickness of 3000 m or more in the west**, and is a type of labradorite basalt, significantly enriched in TiO2. In the flood basalts, the average thickness of individual flows is about 10-100 m, and the flow distance can be 100-150 km or more. Basalts in a region are often formed by several or dozens of eruptions, and the interval between eruptions can be long or short, some up to hundreds of thousands of years.
Central eruption
constitutes a basaltic volcanic cone and its adjacent lava flows and volcanic debris rocks. Eastern China, a vast area from Heilongjiang in the north to Hainan Island in the south, is a complex rock area dominated by alkaline basalt and also labradorite basalt, erupted in the Cenozoic, with central eruptions, and hundreds of volcanic cones, especially abundant in Heilongjiang-Jilin, Inner Mongolia Plateau, Jining-Datong, Nanjing area, Tengchong in Yunnan, Leichung area in Guangdong, and Taiwan.