QUANTITATIVE PREDICTION AND EVALUATION OF POLYMETALLIC SULFIDE MINERAL DEPOSITS ALONG THE CENTRAL INDIAN OCEAN RIDGE
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摘要: 大洋钻探资料证实,现代海底多金属硫化物分布范围广泛、储量大,是具有巨大开发潜力和远景的海底矿产资源。根据水深、地质构造、扩张速率、地球物理以及火山地震等区域性调查数据,分析了印度洋中脊多金属硫化物成矿地质条件、控矿因素和地球物理异常信息,提取了9项找矿证据因子,建立了区域找矿有利条件组合模型。运用证据权重法,对印度洋中脊多金属硫化物资源进行了基于数据驱动的定量预测与评价。研究认为,最有利区(Ⅰ类)占工区面积的29.77%,比较有利区(Ⅱ类)占18.12%。Abstract: The Ocean Drilling Program has proven that the large quantity of seafloor polymetallic sulfide, which is widely distributed in the ocean, has great potential for exploitation. Based on the regional geological data, such as water depth, geological structure, sea flow spreading rate, geophysics, volcanism and earthquake, the authors scrutinized the metallogenetic conditions, ore-controlling factors and geophysical anomalies of the polymetallic sulfide deposits along the Central Indian Ocean Ridge. We extracted 9 evidence factors and established a model of regional ore deposits, and adopted the weights of evidence method to predict and evaluate the polymetallic sulfide along the Central Indian Ocean Ridge. The favorable prospecting areas were delineated by the values of posterior probability. The results of the research will provide a scientific basis for the future exploration and utilization of polymetallic sulfide in Indian Ocean.
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