ANALYSIS ON THE GEOLOGY AND ORE-CONTROLLING FACTORS OF AILIN IRON DEPOSIT IN LIAONING PROVINCE
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摘要:
爱林铁矿区内仅发育一条矿体,属小型矿山.矿石类型为磁铁石英岩型,矿体赋存于鞍山群地层捕掳体中,属层控矿床.控矿构造为爱林至蜂蜜沟复背斜,矿体发育于其南翼.由于缺少大规模容矿构造,该矿区不具备成大矿、富矿的构造条件.区域变质及混合岩化作用与该矿床的形成直接相关,尤其是吕梁期混合岩化作用对铁矿的富集和重结晶起到积极作用.矿床成因为典型的沉积变质型,即鞍山式铁矿.
Abstract:The Ailin iron deposit, with a single orebody in the orefield, is a small-scale mine. The orebody of magnetite quartzite type occurs in the xenolith of Anshan Group, belonging to strata-bound deposit. The ore-controlling structure is Ailin-Fengmigou anticlinoria, with the orebody developed in the south wing. Due to the lack of large-scale ore-hosting structure, the orefield does not have the structural conditions for large and rich ores. The regional metamorphism and migmatization are directly related to the formation of deposit, and particularly the migmatization in Luliang period plays a positive role in the enrichment and recrystallization of iron ore. The genesis of deposit is typical sedimentary metamorphism, that is, Anshan-type iron deposit.
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表 1 磁测异常特征-览表
Table 1. Characterristics of magnetic anomaly
磁异常 异常描述 C2017-01 磁异常大致呈北西向分布,南侧磁异常未封闭,以400 nT圈定范围较大,以1000 nT圈定范围明显变小,一般值1000~1400 nT,△Tmax=2500 nT,磁异常梯度变化不均匀 C2017-02 磁异常呈东西向分布,以400 nT圈定范围呈等轴状大面积分布,一般值1000~1400 nT,△Tmax=2300 nT,磁异常西侧未封闭,磁异常梯度变化较缓 C2017-03 磁异常呈东西向,长椭圆状分布,磁异常北侧较南侧梯度变化较大,近对称分布,四周均有负异常伴生,一般值400~1200 nT,△Tmax=2600 nT C2017-04 磁异常以1000 nT圈定范围呈北东向,一般值1000~1200 nT,△Tmax=2000 nT;而以400 nT圈定磁异常范围,磁异常呈南北向,异常两侧梯度变化较大 C2017-05 磁异常大致呈东西向串珠状展布,北侧有明显的负异常,正负异常间梯度变化较大,一般值-1100~+1000 nT,△Tmin=-1800 nT,△Tmax=2300 nT -
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