基于证据权重法的海南岛金多金属矿成矿预测研究

吴传军; 许德如; 郭涛; 周迎春; 侯茂洲; 周岳强

基于证据权重法的海南岛金多金属矿成矿预测研究

吴传军^{1, 2,},
许德如^1, ,,
郭涛³,
周迎春⁴,
侯茂洲^{1, 2},
周岳强^{1, 2}

1.
中国科学院广州地球化学研究所矿物学与成矿学重点实验室, 广州 510640
2.
中国科学院大学地球科学学院, 北京 100049
3.
中国地质科学院地质力学研究所, 北京 100081
4.
海南省地质调查院, 海口 570206

基金项目:

国家找矿突破行动计划专项 1212011220710

详细信息

作者简介:
吴传军（1985-），男，博士研究生，构造地质学专业。E-mail：wuchuanjun321@126.com

通讯作者:
许德如（1966-），男，研究员，博士生导师，主要从事大陆边缘与成矿学研究。E-mail：Xuderu@gig.ac.cn

中图分类号: P612
计量
- 文章访问数: 213
- HTML全文浏览量: 125
- PDF下载量: 13
- 被引次数: 0
出版历程
- 收稿日期: 2013-09-28
- 刊出日期: 2014-03-01

STUDY ON METALLOGENIC PROGNOSIS FOR GOLD POLYMETALLIC DEPOSITS IN HAINAN ISLAND BASED ON EVIDENCE WEIGHTING METHOD

WU Chuan-jun^{1, 2
,},
XU De-ru^{1
, ,},
GUO Tao³,
ZHOU Ying-chun⁴,
HOU Mao-zhou^{1, 2},
ZHOU Yue-qiang^{1, 2}

1.
Key Laboratory of Mineralogy and Metallogeny, Guangzhou Institute of Geochemistry, CAS, Guangzhou 510640, China
2.
College of Earth Science, University of Chinese Academy of Sciences, Beijing 100049, China
3.
Institute of Geomechanics, Chinese Academy of Geological Sciences, Beijing 100081, China
4.
Hainan Geological Survey Institute, Haikou 570206, China

摘要

摘要: 在系统总结海南岛金多金属矿区域成矿规律的基础上，分析并提取了包括地层、构造、岩浆岩、航磁、化探、遥感等多元有利找矿证据因子，建立了海南岛金多金属矿证据权重预测模型，并采用MRAS软件证据权重模块对研究区进行2 km×2 km的网格单元划分及后验概率计算。根据网格单元后验概率计算值大小及地质矿产空间分布特征，将研究区分三级进行了成矿远景区圈定：A级成矿远景区3个，B级成矿远景区4个、C级成矿远景区24个。研究结果表明，90%的已知矿床（点）位于成矿远景区，显示了良好的预测效果，其结果为该区的找矿工作提供了重要的科学依据。
- 证据权重法 /
- 成矿预测 /
- 金多金属矿 /
- 海南岛
Abstract: Based on systematical analysis of regional metallogenic regularity of gold polymetallic deposits in Hainan Island, multivariate favorable geological evidences such as strata, structure, magmatic rock, aeromagnetic, geochemical exploration, and remote sensing data were analyzed and extracted. With the help of MRAS, the authors established an evidence weight prediction model for gold polymetallic deposits in this area. The study area was divided into 2 km×2 km grid units at first and then the posterior probability of every grid unit was calculated. According to the magnitude of evidence weight and the distribution characteristics of mineral resources, the study area was classified into 3 A-level prospective targets, 4 B-level prospective targets and 24 C-level prospective targets. Research results showed that about 90% deposits were located in metallogenic prospective area showing a good prediction effect, which provided an important scientific basis for prospecting work in this region.
- evidence weighting method /
- metallogenic prognosis /
- gold polymetallic deposit /
- Hainan Island

HTML全文

图 1 海南岛地质简图^[12]

Figure 1. Generalized geological map of the Hainan Island

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图 2 海南岛地层组合熵异常图

Figure 2. Entropy anomalies of the strata in Hainan Island

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图 3 航磁ΔT化极等值线平面图

Figure 3. A contour map of aeromagnetic ΔT

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图 4 航磁ΔT化极垂向一阶导数平面图

Figure 4. A contour map of vertical first derivative of aeromagnetic ΔT

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图 5 遥感羟基异常蚀变信息图

Figure 5. A hydroxyl alteration anomaly map extracted from ETM data

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图 6 遥感铁染异常蚀变信息图

Figure 6. An iron alteration map extracted from ETM data

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图 7 海南岛金多金属矿预测后验概率色块图

Figure 7. A color block map of posterior probability for gold polymetallic prognosis in Hainan Island

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图 8 海南金多金属矿预测远景区

Figure 8. Prospective areas of gold polymetallic deposits in Hainan Island

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表 1 地质证据因子先验概率及权重值

Table 1. Prior probability and weighing values of geological evidence factors

序号	证据因子名称	条件概率1	条件概率2	条件概率3	条件概率4	正权重值	负权重值	相关系数
1	抱板群	0.234375	0.025034	0.765625	0.974966	2.236696	-0.24171	2.478406
2	古生界浅变质岩	0.078125	0.008250	0.921875	0.991750	2.248125	-0.073062	2.321187
3	白垩纪火山岩	0.078125	0.013015	0.921875	0.986985	1.792229	-0.068245	1.860474
4	地层组合熵	0.953125	0.533604	0.046875	0.466396	0.580093	-2.297551	2.877644
5	深大断裂缓冲区	0.660714	0.404478	0.339285	0.595521	0.490723	-0.562594	1.053317
6	次级断裂缓冲区	0.671875	0.311144	0.328125	0.688856	0.769816	-0.741637	1.511453
7	韧性剪切带	0.109375	0.010952	0.890625	0.989048	2.301235	-0.104819	2.406054
8	褶皱缓冲区	0.187500	0.035275	0.812500	0.964725	1.670608	-0.171727	1.842335
9	印支期中酸性岩体	0.156250	0.048432	0.843750	0.951568	1.171300	-0.120255	1.291555
10	燕山期中酸性岩体	0.203125	0.109309	0.796875	0.890691	0.619639	-0.111299	0.730938
11	航磁异常梯度区	0.046875	0.012019	0.953125	0.987981	1.360991	-0.035917	1.396908
12	金地球化学异常	0.671875	0.095086	0.328125	0.904914	1.955294	-1.014446	2.969740
13	钼地球化学异常	0.406250	0.047792	0.593750	0.952208	2.140115	-0.472325	2.612440
14	铅锌地球化学异常	0.390625	0.044449	0.609375	0.955551	2.173401	-0.449854	2.623255
15	钨地球化学异常	0.203125	0.044947	0.796875	0.955053	1.508337	-0.181069	1.689406
16	铜地球化学异常	0.334375	0.112338	0.665625	0.887661	1.739260	-0.260955	2.000215
17	银地球化学异常	0.390625	0.062087	0.609375	0.937913	1.839217	-0.431224	2.270441
18	遥感羟基蚀变异常	0.171875	0.080009	0.828125	0.919991	0.764634	-0.1052	0.869834
19	遥感铁染蚀变异常	0.421875	0.259228	0.578125	0.740772	0.487002	-0.247903	0.734905
20	遥感环状构造	0.093750	0.025247	0.906250	0.974753	1.311919	-0.072869	1.384788
注:条件概率1—矿点出现时, 证据因子出现的概率; 条件概率2—矿点没出现时, 证据因子出现的概率; 条件概率3—矿点出现时, 证据因子没有出现的概率; 条件概率4—矿点没有出现时, 证据因子没有出现的概率

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