后仙峪硼矿区硼矿地质特征及其成因探讨

A DISCUSSION ON THE GEOLOGY AND GENESIS OF THE BORON DEPOSITS IN HOUXIANYU ORE-FIELD

应用美国GoldenSoftware公司最近出品的Surfer8三维软件包将后仙峪硼矿区钻孔及坑道资料编成含矿层B2O3含量等值线图、含矿层厚度等值线图以及底板等高线图等图件,并相互比较,综合研究,得出该硼矿区硼矿含矿层具有分带性与分段性,厚度受方向控制,矿体受构造上的转折端控制等地质特征.结合分析该硼矿区的地质成因,将该硼矿区划分为3个带,又将第3带划分出3个段作为预测区(A、B、C).基于此,将B预测区作为重点远景区,于2002年钻探验证中,在数百米的角闪质混合岩盖层下发现了品位高、厚度大的隐伏硼矿,即二道沟硼矿,取得了寻找隐伏矿体的重大突破,且为在该区进一步寻找隐伏硼矿打下了良好的基础,极大地扩大了该区的找矿前景.

The Houxianyu boron ore field,tectonically located in the west of Yingkou Kuandian paleo uplift,East Liaoning anteclise,North China platform,is an important component of the East Liaoning South Jilin boron belt.The ore bearing serpentinized peridotite is covered by thick inverted amphibolitic migmatite.Based on the geologic information gained from drill holes and mining tunnels,a 3 D software Surfer8 is applied to draw up some isopleth maps of the B2O3 contents,thickness and floor levels of ore bearing beds for the boron deposits in the ore field.Analysis shows that the ore bearing beds in the boron ore field are distributed zonationally and sectionally.The thickness is changed with directions.The ore bodies are controlled by the structural axes.Genesis study suggests that the boron deposits be formed by submarine volcanic eruption,when the ore forming materials deposited along the crater in bands.Then regional metamorphism and compression made the ore bearing beds distributed at the axes of synform or antiform.