莒县天宝钛铁矿地质特征及矿床成因探讨

Study on Geological Characteristics and Its Origin of Tianbao Ilmenite Deposit in Juxian County

莒县棋山天宝钛铁矿是山东省发现并评价的第一个大型钛铁矿矿山，矿区位于沂沐断裂带汞丹山凸起的东部。矿体为褐黑色含钛磁铁角闪石岩，围岩为占元古代吕梁期傲徕山超单元条花峪单元弱片麻状中粗粒,长花岗岩。矿区已发现钛铁矿矿体2个，均呈NE向脉状产生。Ⅰ号矿体长l600m，地表平均宽180m，控制延深204in；Ⅱ号矿体长880m，地表宽150～200m，延深100m以上。2矿体平均品位分别为T1O28．77％，8．33％；TFe18．47％，17．07％。两矿体合计矿石资源量为（331）＋（332）＋（333）10461．6万t，T1O2资源量905．2万t。矿体规模大，易开采，钛、铁及其他有益元素可以综合利用。

Tianbao ilmenite deposit is the first large type ilmenite deposit which is found and evaluated in Shandong province. It locates in east part of Gongdanshan uplift in Yishu fault belt. Ore bodies are brown --black ilmenite--bearing magne--horblendite, while country rocks are poor gneissic coarse monzonitic granite in Tiaohuayu unit of Aolaishan superunit in Mecezoic Luliang formation. 2 ilmenite deposits have been found occurring with the trend of NE. The length of Ⅰ deposit is 1600m, average width is 180m, and controlling depteh is 204m. The length of Ⅱ deposit is 880m, surface width is 150-200m, and the depth is over 100m. Average degree of the two deposits is. TiO2 is 8.77% and 8.33%; TFe is 18.47% and 17. 07%. Resource amount of the two deposits with the type of （331）＋（332） ＋（333） is 10461.6×10^4t, TiO2 is 905.2×10^4t. The scale of the deposit is large and is easy to explore, and ilmenite, iron and other elements can be used synthentically.