老挝塞公省达克金矿区水系沉积物地球化学特征及找矿预测

Geochemical characteristics of stream sediment and prospecting forecast in Dak gold mining area,Sekong Province,Laos

达克金矿区位于老挝长山—岘港成矿带南缘,区域地质工作程度较低,为明确研究区找矿方向,首次对该地区开展了1∶50000水系沉积物地球化学测量,共采集836件样品,分析测试19种元素,通过相关性分析和因子分析将元素异常分成4类组合:F1(Cu-Cr-V-Ti)、F2(W-Mo-Bi)、F3(Au)、F4(Sn)。圈定综合异常17个,其中DJ5、DJ12、DJ10、DJ14、DJ6异常套合好、强度高、规模大、找矿潜力大。综合区内矿床地质特征及水系沉积物地球化学特征,圈定了岩浆热液型钨锡铋钼矿、铜铬镍钒钛矿及浅成低温热液型金矿3处找矿靶区,指明了下一步找矿方向,也为老挝南部地区开展此类工作积累了宝贵经验。

The Dak gold mine is located in southern margin of the Truong Son-Da Nang Metallogenic Belt in Laos,in which few regional geological work is carried out.In order to clarify the prospecting direction of the study area,the geochemical survey of 1∶50,000 river sediment was carried out for the first time in this area,and a total of 836 samples were collected,of which 19 elements were analyzed and tested.Through correlation and factor analysis,the element anomalies were divided into four groups:F1(Cu-Cr-V-Ti),F2(W-Mo-Bi),F3(Au)and F4(Sn).Meanwhile 17 comprehensive anomalies are delineated,among which DJ5,DJ12,DJ10,DJ14,and DJ6 anomalies have the features of high intensity,large scale,well-lapped forms and great prospecting potential.Based on the geological characteristics of ore deposits and the geochemical characteristics of river sediments in the area,three prospecting target areas were delineated,including magmatic hydrothermal tungsten-snbismuth-molybdenum deposit,copper-chromium-nickel-vanadium-titanium deposit,and epithermal low-temperature gold deposit.This indicates the next direction for mineral exploration and provides a reference for future work in the southern region of Laos.