The Resource Evaluation to Boron Element in Eastern Liaoning by the Method of Ore Prospecting Probability-Geochemical Block
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摘要: 利用地球化学块体理论进行矿产资源评价的资源量预测工作中，大多是基于地球化学数据本身，虽考虑了除成矿物源之外的如地层、构造等地质背景因素的影响，但仅限于定性阶段，多用于地球化学块体含矿性的分析及远景区的分级.在充分研究地质背景因素的基础上，认为如地层、构造等富集因素与成矿物质基础是矿床形成的2个必要条件，因此，在资源量计算的工作中，还应考虑富集因素的影响，据此建立了找矿概率-地球化学块体法，并将其应用于辽东硼资源量的定量评价中.结果表明，辽东地区硼矿资源潜力较大并符合客观实际.Abstract: At present, researchers use the geochemical block theory to predict amount of mineral resources based on the geochemical data. Although they take the influences of formation and structure besides the ore material source into account, the application remains in qualitative stage, such as the analysis of the ore potentiality of geochemical block and the classification to prospective area. On the foundation of geological background researches we come to the conclusion that the enrichment factors, namely formation and structure are two necessary conditions for the ore-forming material base. So in the course of calculation of resource extent, we should take their influences into consideration. Finally, we set up the ore prospecting probability-geochemical block ore prospecting method, and use it to quantitatively assess the amount of boron ore in eastern Liaoning. Results show that the eastern Liaoning is of great potential in boron ore, which accords with the facts.
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Key words:
- geochemical block /
- assessment of ore potentiality /
- mineral resources /
- boron deposit
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图 1 辽东地区区域地质略图
Ⅰ.太古宙陆核；Ⅱ.裂谷斜坡区；Ⅲ.裂谷中央凹陷区；1.构造区带范围；2.早元古代里尔峪组；3.条痕状花岗岩4.主要硼矿床
Fig. 1. Geological sketch map in eastern Liaoning
图 2 辽东裂谷硼元素地球化学块体地球化学结构套合
Fig. 2. The internal structure of boron geochemical block in in eastern Liaoning
图 3 Ⅲ号硼地球化学块体谱系
Fig. 3. The family tree of No.3 boron geochemical block in the eastern Liaoning
表 1 含硼岩系硼元素含量及富集系数
Table 1. Composition and concentration coefficients of boron element in boron-bearing rocks
岩石名称 硼矿层位 硼含量(10-6) 富集系数 斜长角闪岩 843 84.3 黑云变粒岩 507 50.7 浅粒岩 1 769 176.9 电气变粒岩 含矿层 5 065 506.5 条痕状花岗岩 1 049 104.9 注：辽东裂谷含硼岩系硼元素含量由中国地质科学院地球物理地球化学勘查研究所分析.硼富集系数=里尔峪组各岩层中硼含量/华北地台地壳硼元素丰度(10×10-6；迟清华，2003). 
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表 2 远景区优选要素组合
Table 2. Factor association of optimally selecting tracts
要素类别 要素说明 地层 处于里尔峪组且厚度大于50 m 构造 褶皱变形的转折端及两翼，背斜构造的核部 岩浆岩 条痕状花岗岩及附近 航磁 中等强度磁异常或一定磁场强度背景下的低缓异常 重力 重力高的线性梯度带或重力梯级带扭曲和舌状突出处 化探 远景区内B元素异常极值点，CaO/MgO＜0.5 矿化 矿点、矿化点
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表 3 辽东硼地球化学块体5级子块体特征
Table 3. Characteristics of geochemical 5 sub-blocks in eastern Liaoning
块体编号 块体面积(km2) 金属量(万t) 矿产地 找矿概率 成矿率 预测资源量(万t) 远景区分级 Ⅰ111-1 77.3 9 459.04 1特大1中型 1.000 Ⅰ112-1 3.68 472.48 0.707 20.034 Ⅱ Ⅰ121-1 17.87 2 565.53 0.587 90.303 Ⅲ Ⅰ211-1 6.22 602.62 0.278 10.049 Ⅰ211-2 2.34 236.19 0.278 3.938 Ⅰ212-1 2.77 282.22 0.707 11.966 Ⅱ111-1 67.5 8 552.98 1大型2小型 1.000 513.179 Ⅰ Ⅱ111-2 30.6 3 230.75 1.000 193.845 Ⅱ112-1 38.45 3 704.27 0.000 0.000 Ⅱ112-2 22.56 2 306.13 0.000 0.000 Ⅱ112-3 13.86 1 390.32 0.000 0.000 Ⅲ111-1 171.23 21 240.55 4中型8小型 1.000 1 274.433 Ⅰ Ⅲ111-2 55.58 8 092.58 1中型 1.000 485.555 Ⅰ Ⅲ111-4 22.57 2 496.47 3小型 0.869 130.128 Ⅱ Ⅲ111-5 2 297.1 1小型 0.718 12.797 Ⅲ112-1 19.45 3 078.28 3大型 1.000 0.06 Ⅲ112-2 3.9 488.38 1中型1小型 0.867 25.392 Ⅲ113-1 16.92 1 881.8 1小型 0.869 98.088 Ⅱ Ⅲ311-1 2.03 318.43 1小型 0.853 16.304 1111-1 19.03 3019.83 0.705 127.686 Ⅲ 2111-1 77.06 10 789.07 0.722 467.438 Ⅲ 2112-1 16.87 2 574.74 0.853 131.828 Ⅱ 注：由于Ⅰ111-1远景区已知矿床为翁泉沟硼铁矿，具有特殊性，故选用Ⅲ112-1远景区作为模型区计算成矿率，并未计算Ⅲ112-1及Ⅰ111-1两个远景区资源量.
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