运积物覆盖区地球化学找矿方法——土壤热磁组分测量

doi:10.11720/wtyht.2019.0041

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摘要

针对运积物覆盖区找矿面临的技术难题,引入土壤热磁组分测量方法,以冀北蔡家营热液型铅锌银矿、东天山沙泉子岩浆型铜镍硫化物矿以及野马泉地区矽卡岩型铁铜多金属矿为例,选择运积物覆盖地段开展剖面及面积性方法试验研究。蔡家营与沙泉子研究区实验结果表明,与常规土壤测量方法获得的弱小异常相比,热磁组分测量地表异常显著,能够很好地反映出深部矿体空间位置及展布形态,具有强化弱异常、发现新异常的优势;野马泉地区试验结果表明,在运积物覆盖达百米以上的已知矿区或勘查区,热磁组分测量均有异常显示,异常元素空间套合较好,并为已知区外围覆盖区找矿勘查提供了新的找矿靶区。经实验证实,土壤热磁组分测量技术为解决运积物覆盖区找矿难题提供了一种行之有效的方法。

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	唐世新
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关键词 ：干旱半干旱区, 运积物盖层, 地球化学勘查, 找矿方法, 热磁组分测量

Abstract：

Aimed at the technical problem of ore-prospecting in transported overburden region, the authors carried out experimental studies of the method of thermalmagnetic component measurement in the known mining areas, which included the Caijiaying hydrothermal type lead-zinc-silver deposit in Hebei Province, the Shaquanzi magmatic copper-nickel sulfide deposit in east Tianshan, and the skarn type iron-copper polymetallic deposit in Yemaquan area. The experimental results of Caijiaying and Shaquanzi area show that, compared with the small and weak anomalies obtained by conventional soil measurement, the surface anomalies measured by thermal-magnetic components are significant, which can well reflect the spatial location and distribution pattern of deep orebodies and have the advantages of strengthening weak anomalies and discovering new ones. The results of the experiment in Yemaquan area show that there are anomalies delineated by thermomagnetic component measurement at the known mining areas with transported sediments covering more than 100 meters. And well matched abnormal elements in space provide a new target area for prospecting in the unknown area. It has been proved by experiments that the thermomagnetic component measurement technology provides an effective method for solving the problem of ore-prospecting in the transported covered region.

Key words： arid and semi-arid region transported overburden geochemical exploration prospecting method thermalmagnetic component measurement

收稿日期: 2019-01-18 出版日期: 2019-08-15

P632

基金资助:中国地质科学院基本科研业务费专项经费(YYWF201731);中国地质调查局地质调查项目(DD20160040)

作者简介: 唐世新(1985-),女,工程师,主要从事地球化学勘查方法研究工作。Email: tangshixin@igge.cn

引用本文:

唐世新, 李建军, 马生明, 胡树起. 运积物覆盖区地球化学找矿方法——土壤热磁组分测量[J]. 物探与化探, 2019, 43(4): 749-757.
Shi-Xin TANG, Jian-Jun LI, Sheng-Ming MA, Shu-Qi HU. Thermomagnetic component measurement: A geochemical prospecting method for transported overburden region. Geophysical and Geochemical Exploration, 2019, 43(4): 749-757.

链接本文:

https://www.wutanyuhuatan.com/CN/10.11720/wtyht.2019.0041 或 https://www.wutanyuhuatan.com/CN/Y2019/V43/I4/749

Fig.1 样品焙烧温度(a)与时间试验(b)

Fig.2 热磁组分电磁分选流程示意

Fig.3 蔡家营试验区风成砂覆盖地段常规土壤与热磁组分测量结果对比

Fig.4 沙泉子试验区成矿元素箱式图

Fig.5 沙泉子试验区常规土壤与热磁组分主成矿元素异常分布

Fig.6 野马泉地区土壤热磁组分测量地球化学异常分布

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