物探化探计算技术2026，Vol.48Issue(3)：404-421,18.DOI:10.12474/wthtjs.20250327-0001
扬子西缘小石桥新型锂矿的地球化学低弱异常信息提取及地质意义
Extraction of weak geochemical anomalies and geological significance of the Xiaoshiqiao new-type lithium deposit on the western margin of the Yangtze Block
摘要
Abstract
Due to the complexity of geological processes and metallogenic systems,geochemical anomalies in exploration often exhibit weak and subdued characteristics,as well as complexities arising from the superposition of multiple distribution patterns.This limits the effectiveness of identification methods based on the normal distribution.To improve the recognition of weak and subtle anomalies,this study systematically compares various geochemical anomaly identification methods,using the Xiaoshiqiao new-type lithium deposit in central Yunnan as an example.To address the issues of weak interpretability and low convergence efficiency of Self-Organizing Maps(SOM),as well as the sensitivity of k-means++to initial cluster centers,a hybrid clustering algorithm combining SOM and k-means++is proposed for geochemical anomaly identification in the study area.Comparison with Gaussian Mixture Models,the concentration-area fractal method,and local singularity analysis shows that the hybrid method can effectively identify weak anomalies in high-dimensional data,and the delineated anomaly areas correspond well spatially with known lithium ore bodies.Fry analysis based on five sets of target anomaly points further reveals that lithium enrichment exhibits a north-south trend at multiple scales and is closely related to negative topography,suggesting that north-south-trending linear structures may be the main factors controlling the spatial localization of lithium deposits in this area.This understanding provides insights into the reinterpretation of the metallogenic mechanism of lithium deposits on the western margin of the Yangtze Block and offers a scientific basis for subsequent prospecting and exploration.关键词
勘查地球化学异常识别/分形奇异性/SOM-k-means++/扬子西缘/碳酸盐黏土型锂矿Key words
identification of exploration geochemical anomalies/fractal singularity/SOM-k-means++/western margin of the Yangtze Block/carbonate clay-type lithium deposit分类
天文与地球科学引用本文复制引用
蔺子健,朱平平,刘岳,张向飞..扬子西缘小石桥新型锂矿的地球化学低弱异常信息提取及地质意义[J].物探化探计算技术,2026,48(3):404-421,18.基金项目
深地国家科技重大专项(2024ZD1001605) （2024ZD1001605）
国家自然科学基金重点项目(42430111) （42430111）
云南省"兴滇英才支持计划"青年人才项目(KKRD202221051) （KKRD202221051）
云南省应用基础研究基金-面上项目(202301AT070447) （202301AT070447）
云南省高层次科技人才及创新团队选拔专项(202305AT350004) （202305AT350004）
