广东凡口铅锌矿床含矿地层沉积相特征分析

Study on Sedimentary Facies in the Ore-bearing Stratum at Fankou Lead-zinc Deposit in Guangdong

凡口矿区主要赋矿地层为泥盆系,岩石类型以碳酸盐岩为主.主要沉积相类型有滨海相、局限台地相、浅海陆棚相.沉积环境为一套碎屑岩-碳酸盐岩过渡带沉积,沉积厚度在矿区内部自西向东变化不大,显示出矿区沉积环境比较稳定的特征.沉积相总体上经历了早泥盆世滨海相-中晚泥盆世半局限台地相-浅海陆棚相的演化过程,这一演化过程中,海水的深度和水动力强度经历了由浅到深再到浅的演化过程,构成了一个完整的海进-海退沉积旋回.

The main ore bearing stratum is Devonian, and the main rock type is carbonatite rock. Fankou Deposit can be divided into littoral, restricted platform, and neritic shelf facies. Sedimentary environment is a clastic rock and carbonatite transition zone deposition. From the lateral view, the deposition thickness of sedimentary facies has not changed from the west to the east, showing the stable sedimentary environment in the mining area. Look from the longitudinal, the sedimen- tary facies has generally experienced the Early Devonian littoral, Middle-Late Devonian semi-restricted platform, shelf faci- es. The evolution process, the depth and strength of the seawater have experiellced the shallow to deep to shallow, comple- ting the transgression-regressive deposition cycle.