Advantages and Disadvantages in Delineating Geochemical Anomalies by Lithologic Zoning Anomaly Based on Lower Limit Contrast Method: A Case Study in Jinshan, Jiangsu Province
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摘要:
笔者以金山地区1∶10 000土壤地球化学调查数据为例，利用岩性分区异常下限衬值法圈定异常，通过与传统方法对比，发现岩性分区异常下限衬值法可以有效避免岩性对异常的控制作用，消除背景的影响，圈定的化探异常能提供更有效的找矿信息。通过野外踏勘和异常查证，并对有找矿意义的重点异常进行槽探、钻探验证，发现具工业价值钨矿体和铅锌矿脉。研究表明，利用岩性分区异常下限衬值法在岩性较复杂区确定异常下限的有效性，该方法可以推广使用。
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关键词:
- 化探异常圈定 /
- 异常下限衬值法 /
- 岩性分区 /
- MAPGIS异常图绘制 /
- 江苏金山
Abstract:Based on the data of geochemical soil surveys at the scale of 1∶
10000 in Jinshan, geochemical anomalies were delineated by lower limit on lithological zone in the study. Compared to traditional methods, it can effectively avoid the control of lithology on the anomaly and eliminate the influence of geological background. Moreover, geochemical anomalies, delineated by lower limit, can provide more effective information in prospecting. Through field exploration and anomaly verification, as well as trenching and drilling verification of key anomalies with prospecting significance, industrial valuable tungsten ore bodies and lead-zinc ore veins were discovered. It suggest that lithology zoning anomaly lower limit contrast method is viable in areas with complex lithology, and therefore can be widely used. -
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表 1 研究区两种方法统计的元素背景值（X）与异常下限（Ca）
Table 1. Element background value (X) and anomaly lower limit (Ca) of two statistical methods in Jinshan area
分类参数 W Mo Pb Cu Sn 岩性分区异常
下限衬值法第四系
（n=1381 ）X 2.66 0.6 24.2 21.2 3.35 Ca 3.64 0.90 31.2 28.9 4.53 火山岩
（n=618）X 10.18 0.93 25.6 22.2 3.19 Ca 27.77 1.52 34.5 31.8 4.34 侵入岩
（n=57）X 18.59 1.35 33.3 17.4 3.47 Ca 40.57 2.19 50.5 24.8 4.54 碳酸盐岩
（n=771）X 7.85 1.06 29.0 21.5 3.28 Ca 19.38 1.81 41.5 30.7 4.35 传统方法（n= 2827 ）X 2.82 0.79 25.4 21.4 3.30 Ca 4.16 1.41 34.0 29.9 4.45 算术均值（n= 2827 ）7.78 0.96 28.09 22.2 3.37 江苏土壤丰度 1.85 0.53 22.6 24.0 3.16 浓集比率 4.21 1.80 1.24 0.93 1.07 注：元素含量为10−6；n为样品数；X为背景值；Ca为异常下限；江苏土壤丰度据廖启林等，2013；浓集比率=算术均值/江苏土壤丰度。 
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