吉林省敦化尔站矿区地球化学异常与钼矿体的相关性分析北大核心CSCD

吉林省敦化尔站矿区位于吉黑东部多金属成矿带中南部,以往资料表明有Mo、Cu等元素地球化学异常和斑岩体存在。为查明该区成矿条件,明确勘探思路,开展了水系沉积物、土壤元素地球化学和地物化综合剖面测量工作。通过对各元素分布、相关性和异常特征研究,发现水系和土壤地球化学异常具有较好重现性,R型聚类分析表明Mo与As、W元素相关性较好,主成矿元素为Mo元素,在地球化学高异常和低阻高极化率区域进行异常查证,发现钼矿体6条。钼矿体产于晚二叠世蚀变似斑状二长花岗岩体及其与围岩接触带,主要受北东向构造带控制,Mo和As等元素地球化学异常与矿体和蚀变带的辉钼矿、黄铁矿等关系密切。综合分析尔站矿区成矿地质条件,在已发现矿体北东和南东圈定靶区2个,区域上含前寒武系残片呈北东向展布的晚古生代花岗岩区是重点找矿地段。

Correlation between Geochemical Anomalies and Molybdenum Ore Bodies in the Erzhan Ore District of Dunhua City,Jilin Province

The Erzhan ore district in Dunhua City of Jilin Province is located in the central-southern part of the eastern Jihei polymetallic metallogenic belt. Previous study has confirmed geochemical anomalies of Mo and Cu elements and the presence of porphyry bodies in this ore district. This work conducted stream sediment and soil geochemical surveys, as well as composite geological-geophysical-geochemical measurements, in order to ascertain the metallogenic conditions and clarify exploration ideas. The element distribution, element correlation and element anomalies reveal that stream sediment anomalies agree well with the soil geochemical anomalies. R-type clustering analysis indicates a good correlation of Mo with As and W elements, with Mo as the main ore-forming element. Six molybdenum ore bodies were delineated by anomaly inspection in area that has strong geochemical anomalies, low resistance and high polarization. The molybdenum ore bodies are mainly hosted in the Late Permian altered porphyritic monzonitic granite and its contact zone with surrounding metamorphic rock, and are controlled by NE-trending structural belt. The geochemical Mo and As anomalies are closely related to molybdenite and pyrite in ore bodies and alteration zones. In combination with the ore-forming conditions, two target areas have been delineated in the northeast and southeast of the discovered ore bodies, and the Late Paleozoic NE-trending granite area containing Precambrian strata is the key prospecting area.