摘要
山东省济宁磁异常是一个重、磁同源体，面积大于100km^2，磁异常峰值为3800nT。钻探验证在孔深1041．57～1796．54m位置发现铁矿体，矿体总厚度74．04～220m，磁性铁平均品位15．89％～25．19％。矿石类型有条带状方解磁铁石英岩和条带状磁铁石英大理岩，矿石的主要组成矿物为石英、方解石、磁铁矿、磁赤铁矿、菱铁矿。矿体产于济宁岩群浅变质岩系中，矿床特征与条带状铁建造（BIF）铁矿或鞍山式铁矿有明显区别，铁矿成因类型属与千枚岩、变质中酸性火山岩、大理岩有关的沉积变质型铁矿床。该区铁矿资源潜力巨大。
Jining magnetic anomaly area, located in Shandong province and covering an area of more than 100km^2 , is a composite unit of gravity anomaly and magnetic anomaly, with magnetic anomaly peaking at 3800nT. Drilling core reveals that iron orebodies present at depth of 1041. 57 - 1796. 54m, and total thickness of orebody is between 74.04-220m, and an average grade of magnetite is 15.89%-25.19%. Ore occurs as banded calcite-magnetite quartzite and magnetite-quartz-marble, mainly consisting of quartz, calcite, magnetite, maghemite and siderite. Orebodies occur in low-degree metamorphic rocks of the Jining Group, and are distinctly different from the banded iron formation or Anshan-type iron deposit. The genesis of this iron deposit belongs to sedimentary metamorphic iron deposits related to phyllite, metamorphic intermediate and acid volcanic rocks and marble. Therefore, it is of great exploration potential.
出处
《地质学报》
CAS
CSCD
北大核心
2008年第9期1285-1291,I0004,共8页
Acta Geologica Sinica
基金
国家自然科学基金(编号40672139)资助的成果
关键词
济宁磁异常
沉积变质铁矿
磁铁矿
浅变质岩系
钻探验证
Jining magnetic anomaly
metamorphosed sedimentary iron deposit
epizonal metamorphic rocks
bore test
