摘要
利用青海杂多地区的1:5万水系沉积物测量资料,分别采用常规统计法和多重分形法获得区内Pb和Zn元素的单元素地球化学异常。引入循证医学领域广泛使用的Meta分析方法对上述异常的找矿有效性进行定量评价。通过实验对用于数据提取的多区域法和多级网格的特点及其适用条件进行分析和总结。研究结果表明:利用Meta分析提取地质数据时应优先采用多区域法,当检验样本数量难以达到Meta分析的要求时方可采用多级网格法;基于Meta分析的找矿有效性评价不但能利用优势比RO对找矿有效性的差异进行定量描述,而且可利用假设检验对有效性比较的结果是否具有统计学意义进行判定;利用Meta分析进行多种勘探方法的找矿有效性定量评价能为找矿预测提供关键、高效的找矿参数,具有较大的找矿应用潜力。
The survey data of stream sediment with the scale of 1：50 000 in Zaduo, Qinghai Province was used to obtain geochemical anomalies of Pb and Zn elements based on the methods of statistics and multifractal. Meta-analysis is a comprehensive statistical method used in evidence-based medicine, which was used to evaluate the prospecting effectiveness of different geochemical anomalies quantitatively. The characteristics and applicable conditions of multi-regional and multi-level grid methods used for data extraction were analyzed and summarized by experiment. The results show that when geological data are extracted based on Meta-analysis, multi-regional method should be used firstly. When the number of test samples is difficult to meet the requirements of the Meta-analysis, multi-level grid can be used as an alternative method. There are two superiorities of using Meta-analysis to evaluate the prospecting effectiveness. Odds ratio（RO） of Meta-analysis can describe the differences of effectiveness quantitatively. In addition, hypothesis testing can be used to judge whether there is a statistically significant for the Meta-analysis result of effectiveness. Meta-analysis is an effective tool for effectiveness evaluation of geophysical and geochemical prospecting techniques. The evaluation results of prospecting effectiveness can provide the critical and efficient prospecting parameters for metallogenic prediction. This method has good application potential.
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2015年第1期180-187,共8页
Journal of Central South University:Science and Technology
基金
中国博士后科学基金资助项目(2012T50832)
湖南省科技计划项目(2012RS4047)
青海省重大科技专项(2010-J-A1)~~
关键词
META分析
化探异常
找矿有效性
定量评价
网格尺度
Meta-analysis
geochemical anomaly
prospecting effectiveness
quantitative evaluation
grid size
