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GEOCHEMICAL FEATURES OF THE YEJINGABO GOLD DEPOSIT IN LANKAZI COUNTY, TIBET

LI Yu-song;ZHENG You-lin;ZHANG Nan;Institute of Geophysical and Geochemical Survey Technology of Anhui Province;No.311 Unit of Bureau of Geology and Mineral Exploration of Anhui Province;Tibet Baibihe Industrial Ltd.;  
Located in the Gangdese metallogenic belt, the Yejingabo gold deposit was found out by tracing Au,As multielement assemblage anomalies discovered by regional geochemical survey, and belonged to hydrothermal gold deposit. The abundances of Au, As, Sb, W, Hg, Ag, Bi and Pb in various rocks in the area are times higher than those in China in average, indicating that the area has abundant material sources. Petrogeochemical study showed that there are assemblage anomalies of more than 10 elements such as Au, As and Sb identified around the surface of the deposit. Of the elements, Au is ore-forming indicator, As, Sb and W are closely associated elements, and Bi, Ag, Pb and Hg are commonly associated elements. The multielement assemblage anomaly concentration zones are developed, with the overlaps of concentration centers indicating the place of gold ore(mineralization) body. Ore body element indicators(Au, As, Sb, W, Hg, Bi, Ag, Pb) anomalies occur at the contact of rock mass and stratum, and the meeting place of structures, implying that gold ore is associated with magmatism, hydrothermalism and faulted structure, and is a product of multiple stages of superimposition of tectonism, magmatism and hydrothermalism, and of enrichment. This deposit lies in the Gangdese metallogenic belt and this study is helpful to identification and test of gold anomalies, and prospecting of new gold deposits along the belt.
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