山东省平度—莱西地区透辉石矿矿床地质特征

Geological Characteristics of Diopside Depositin Pingdu—Laixi Area in Shandong Province

摘要:

平度—莱西地区透辉石矿成矿带西起平度长乐镇东至莱西市南墅镇，全长约50km，宽约5km，总体分布方向近EW向。矿体控制长度为510～1873.5m,厚度为45.72～67.59m,最大延伸约200m。矿石矿物透辉石含量一般为80%～98%。有害组分Fe2O3含量一般为0.22%～0.31%，MnO+TiO2含量一般为0.02%～0.07%，含量极低。矿石自然白度69.2%～87.9%，差热分析曲线基本为一直线，无吸热、放热效应。矿体赋存于在早元古代荆山群野头组定国寺段，其产出空间严格受地层层位控制。成矿原岩为硅质白云岩，为浅海相沉积环境硅质碳酸盐沉积，属中温中压沉积变质类型矿床。

Abstract:

Diopside ore-forming belt in Pingdu—Laixi area is from Changle town in Pingdu city to Nanshu town in Laixi city from west to east. The total length is about 50km and the width is about 5km. The overall distribution direction is approximately EW trend. The ength of ore body is 510~1873.5m, the thickness is 45.72~67.59m, and the maximum extension is about 200m. The content of diopside is generally 80%~98%. The content of Fe2O3 is generally 0.22%～0.31%, and the content of MnO+TiO2 is generally 0.02%～0.07%. The natural whiteness of the ore is 69.2%～87.9%, and the differential thermal analysis curve is a straight line with no endothermic and exothermic effects. The ore body is distributed in Dingguosi section of the early Proterozoic Jingshan group. Its production space is strictly controlled by the stratum. The ore-forming original rock is siliceous dolomite, which is a siliceous carbonate deposit in the shallow marine sedimentary environment. It is a medium-temperature and medium-pressure sedimentary metamorphic type deposit.