宜昌磷矿殷家沟矿区鱼林溪矿段地质特征及Ph_1~3磷矿层矿石特征研究

Study on Geological Characteristics and Ore Characteristics of Ph_1~3 Phosphate Deposits in Yinjiagou Mining Area at Yulinxi Ore Section of Yichang Phosphate Mine

鱼林溪矿段处于宜昌磷矿田北部殷家沟矿区东段,通过地质勘探工作求获磷矿资源储量约7 700万t,为一大型磷矿床;区域上有6个含磷层位,鱼林溪矿段仅发育樟村坪段(Ph_1),其中Ph_1~3磷矿层具有工业价值。Ph_1~3磷矿层上部为白云质条带磷块岩,中部为块状磷块岩或稠密条带磷块岩,下部为泥质条带磷块岩,即典型的"上贫矿+中富矿+下贫矿"三元结构。该磷层矿石有白云质条带磷块岩、致密块状磷块岩和泥质条带状磷块岩三种类型,主要矿石矿物为氟磷灰石和碳氟磷灰石,矿石中各类化学成分出现规律性变化,P_2O_5一般随CaO、F、I、枸溶性P_2O_5含量的升高而升高,随MgO、SiO_2、酸不溶物等含量升高而相对降低。矿石学研究可指示当时成矿沉积环境,对扩大宜昌磷矿规模、进行深部找矿和资源远景预测具有重要意义。

The Yulinxi section is located in the eastern part of Yinjiagou Mine in the northern part of Yichang phosphorus field. The geological reserves are about 77 million tons of mineral resources,which is a large phosphate deposit. In the 6 phosphate layers of Yichang Phosphorus Field（ Ph1）,the Yulinxi section only develops Zhangcunping Part,of which Ph13 phosphate layer has industrial value. The upper part of the Ph13 phosphate layer is a dolomitic phosphorous rock,the middle is a massive phosphorous rock or a dense band of phosphorus rock,and the lower part is a mudstone band,which is a typical ＂Under the poor ore ＂ternary structure. The phosphate rock has three types： dolomitic phosphate rock,dense block-like phosphate rock and mud-striped phosphate rock. The main ore minerals are fluorapatite and fluorocarbonite. P2O5 generally increases with the contents of CaO,F,I and citric acid P2O5,and decreases with the increase of MgO,SiO2 and acid insolubles. Ore study can indicate the mineralization and depositional environment at that time,which is of great significance to expand the scale of Yichang phosphate rock,carry out deep prospect and resource forecast.