| 任宏艳.基于证据权重模型的张八岭构造带北段金矿的成矿预测[J].甘肃地质,2024,(4):33-40 |
| 基于证据权重模型的张八岭构造带北段金矿的成矿预测 |
| Metallogenic Prediction of Gold Deposit in Northern Section of Zhangbaling Tectonic Belt Based on Evidence Weight Model |
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| DOI： |
| 中文关键词: 成矿预测 证据权重模型 靶区圈定 金矿 张八岭构造带北段 |
| 英文关键词:metallogenic prediction evidence weight model target area delineation gold mine the northern part of Zhangbaling tectonic belt |
| 基金项目:山西工程职业学院2024年度揭榜挂帅课题“基于证据权重法的成矿预测研究”（ＫＹ２０２４－８） |
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| 中文摘要: |
| 张八岭构造带位于华北板块与扬子板块的接合部位，具有较好的金矿成矿地质背景条件。经过控矿因素综合分析，提取构置了地层、断裂0. 8 km缓冲区、岩浆岩2 km缓冲区、与Au有关的蚀变带、1 ∶ 20万水系沉积物Au元素化探综合异常共5个预测变量，基于GIS的证据权重模型，对各预测变量进行先验概率计算、权重值计算和后验概率，最终对该区金矿进行了成矿靶区圈定和成矿远景区块预测。根据证据权重模型计算得出的后验概率和该区金矿地质特征，圈出了I级找矿远景区3处、Ⅱ级找矿远景区3处和Ⅲ级靶区1处。经与已有矿点套合，分析得出：证据权重模型得到的预测结果比较可靠，与成矿带吻合度高。I级和II级找矿远景区后验概率值高，表明金矿找矿潜力高。落入远景预测区但还未被发现和开采的金矿床（点）是张八岭北段地区今后金矿勘查的重点区域。因此，本次研究为张八岭构造带金矿床（点）的进一步勘查提供了科学依据。 |
| 英文摘要: |
| Zhangbaling tectonic belt, located at the junction of North China Plate and Yangtze Plate, has a good geological background for gold mineralization. After comprehensive analysis of ore-controlling factors, Ten predictors including the formation, fault 0. 8 km buffer zone, magmatic rock 2 km buffer zone, alteration zone related to Au, Geochemical synthesis anomaly related to Au element in 1 ∶ 200 000 stream sediment were extracted. Based on the evidence weight model of GIS, the prior probability, weight value and a backward probability of each predictor are calculated. Finally, the metallogenic target area is delineated and the metallogenic prospect block is predicted in this area. According to the posterior probability calculated by the evidence weight model and the geological characteristics of the gold deposit in this area, 3 prospecting prospects of grade I, 3 prospecting prospects of grade II and 1 target of grade III are rounded out. It is concluded that the prediction results obtained by the evidence weight model are more reliable, the agreement with the metallogenic belt is high. The high posterior probability values of Grade I and Grade II prospecting prospects indicate high gold prospecting potential. The gold deposits （points） which fall into the prospective prediction area but have not yet been discovered and exploited are the key areas for future gold exploration in the north Zhangbaling section. Therefore, this study provides a scientific basis for further exploration of gold deposits（points） in Zhangbaling tectonic belt. |
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