DU Sheng-jiang1,2, WEN Han-jie1, QIN Chao-jian1, YAN Yong-feng3, YANG Guang-shu3, FENG Peng-yu3
(1. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;
2. University of Chinese Academy of Sciences, Beijing 100049, China;
3. Kunming University of Science and Technology, Kunming 650000, China)
Abstract: Beryllium is one of the rarest metals and its content is about 6×10-4 in the earth's crust. There are more than 50 mineral species that contain Be at present. However, the main minerals with economic value are alexandrite, phenacite, helvine and beryl (the most common among them). A new Be resource has recently been discovered in the Maka tungsten polymetallic deposit, north of Laojunshan ore concentration area, southeastern Yunnan Province. Significant is the finding that the occurrence of Be at this deposit is helvine, which is different from other Be beryl-type deposits in the ore concentration area. Furthermore, we observes an intergrowth of helvine, scheelite and fluorite using a scanning electron microscope. Our research shows that Be associated with quartz-vein-type W ore is often beryl and that helvine mainly originates from skarn. Therefore, the significance of the discovery of helvine in the Maka tungsten polymetallic deposit is not only a new type of occurrence for this resource but it can also provide indications of the ore-forming spatial model in which the quartz-vein-type W ore is distributed nearer to the surface and the skarn-type tungsten deposit is located deeper.
Key words: helvine; Beryllium ore; Laojunshan ore concentration area; Maka tungsten polymetallic deposit; Tungsten mineralization
ACTA MINERALOGICA SINICA Vol. 34, No. 4, 2014, Page 446-450
