GOLD MINERALIZATOIN FEATURES OF SUOILINH – SONGMADA (LINH SPRING – MADA RIVER) AREA AND ITS PROSPECTS
Abstract
Suoilinh–Songmada area is situated in Vinhan ore region, in the SW of Dalat zone. Gold mineralization in this region occurred mainly in granitoid of Dinhquan complex, some of them are found in terrigenous-carbonate sedimentary rocks of formations: Dakrong and Mada. The host rocks were strongly altered mainly by sericitization, quartization, chloritization, and epidotization. The ores deposits were formed in veins, zones of veins that their direction is different: mainly in NE-SW, and NW-SE; secondary in sub-longitude and sub-latitude. They are related to main fault in NW-SE direction. The mineral associations are mainly presented by pyrite, arsenopyrite, galena, sphalerite, chalcopyrite, native gold, and electrum, occupying 10-20%. The gold mineralization genesis is low-medium temperature hydrothermal, (125÷2670C) related to calc-alkaline granitoid which was formed in magmatic arc of active continental margin of ancient East Asia type, developed in Late Mesozoic. The ore deposit type is vein-shaped gold-quartz-sulfide; mineral types are: gold-quart-pyrite-arsenopyrite and gold-quartz-polymetallic sulfide. With the above-mentioned features of spatial distribution and mineralization, gold mineralization of the Suoilinh–Songmada area has high potential which should be studied more.