摘要
西准噶尔成矿带地处中亚成矿域核心区,伴随着古生代强烈的构造岩浆活动,发生了广泛的金成矿作用,形成了一系列金矿床、矿点及矿化点,如萨尔托海、哈图、包古图等金矿床,已成为我国重要的黄金开发基地之一.基于该成矿带水系沉积物地球化学数据,采用集成序贯指示模拟技术和多重分形局部奇异性分析方法,开展金异常信息识别及其不确定性定量模拟,有效突出局部异常和弱缓异常,实现金元素富集异常在空间上的概率分布与量化表达.研究结果显示,金奇异性指数小于2的条件下,金元素富集异常的高概率区与已知金矿产地在空间分布上非常吻合,该研究可为西准噶尔成矿带金矿勘查及其不确定性风险评估提供决策依据.
West Junggar belt,located in the core area of the Central Asian metallogenic domain,is one of the most important gold development bases in China.Accompanying intense tectonic and magmatic activities,extensive gold mineralization occurred during Paleozoic and a series of gold deposits/occurrences and mineralized points have been discovered in the West Junggar belt such as Sartohay,Hatu and Baogutu gold deposits.In the present study,the methods of local singularity analysis and sequential indicator simulation were employed to identify gold anomaly and model its uncertainty based on stream sediment geochemical data sampled from West Junggar belt,which allows for enhancing local and weak anomalies effectively.The results of simulation can be used to express probability distribution pattern of gold anomalies characterized by singularity indices less than2.The results indicate that high probability zones of gold anomalies are closely associated with known gold deposits/occurrences,which provides an important decision-making for risk evaluation of gold resource exploration in the West Junggar belt.
作者
刘岳
周可法
Liu Yue;Zhou Kefa(Xinjiang Research Centre for Mineral Resources,Xinjiang Institute of Ecology and Geography,Chinese Academy of Sciences,Urumqi 830011,China;Xinjiang Key Laboratory of Mineral Resources and Digital Geology,Urumqi 830011,China)
出处
《地球科学》
EI
CAS
CSCD
北大核心
2018年第9期3186-3199,共14页
Earth Science
基金
新疆维吾尔自治区自然科学基金项目(No.2017D01A81)
关键词
序贯指示模拟
局部奇异性
不确定性评价
西准噶尔成矿带
金矿异常识别
矿床地质
sequential indicator simulatiom local singularity analysis
uncertainty assessment
West Junggar belt
gold anoma-ly identification
ore deposit geology.
