The tungsten deposit of Shimensi in Dahutang was studied to explore the source of the ore-forming materials The geochemical characteristics and source of ore-forming materials of Tungsten deposit were studied from field sampling

rock and mineral identification

stable isotope analysis and other aspects. Sulfur isotopes in the samples of the concealed explosive angle conglomerate type and the fine vein disseminated type were determined

and 27 samples were selected for determination. Results show that the value of delta34 S of the concealed explosive angle conglomerate type deposit was higher than the fine vein disseminated type deposit. The delta34 S value of the sample had an obvious characteristic of ower distribution. Sulfur isotopic composition of sulfide deposits in the ore deposit was relatively stable. The total value of delta34 S was close to the mantle source of sulfur

which meant sulfur was mainly derived from the deep magma or the upper mantle.Research results showed that the granite in Shimensi mining area of Yanshan period was a mineral source layer of tungsten.The ore-forming materials were mainly derived from the sulfur type granite magma in the Great Lakes of Yanshan period.However

situation did not exclude that other ore forming materials were extracted in the rising process.