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大新县榄圩磷矿主要产于下石炭统岩关阶笫一岩段及上泥盆统三里组第四岩段灰岩之间的岩溶粘土中,含矿岩溶粘土往往埋藏在地下水位之下较深的位置,具有岩溶(特别是深岩溶)成矿的特点。 矿区岩关阶和上泥盆统上部含磷岩石发育是其有利的矿源层;而岩关阶底部和上泥盆统上部灰岩则是岩溶发育的良好条件;矿区向斜褶曲形成的承压水盆地有利于层内深岩溶的形成。因此,在气候和水文条件有利的情况下,矿源层的含磷岩石遭受分解,磷酸盐随着地下水的补给源源不断地迁移到岩溶成矿空间。在碱性的岩溶水中聚集,当达到饱和后,便和其他岩溶物质一起沉积下来,形成磷矿床。
The Lixu phosphate rock in Daxin County is mainly produced in the karst clay between the limestone of the Lower Carboniferous Guanjingtai and the limestone of the fourth member of the Upper Devonian Sanli Formation, and the ore-bearing karst clay is often buried in the groundwater level Under the deeper position, with karst (especially deep karst) mineralization characteristics. The lithofacies of the mines and the development of upper phosphoriferous rocks in the Upper Devonian are favorable source rocks. The bottom of the rocks and the Upper Devonian limestone are favorable conditions for the development of karst. Water basins are good for the formation of deep karsts in the layers. As a result, phosphorus-bearing rocks in the source beds are decomposed under favorable climatic and hydrological conditions, and phosphates continue to migrate into the karst mineralization space with groundwater recharge. Aggregated in alkaline karst water, when it reaches saturation, it is deposited with other karst materials to form a phosphate deposit.