SU Hang1,2, WANG Xiao-juan3,4, CHEN Zhi-ming1,2, LI Shan-zhi1,2
(1. Yunnan Hualian mineral Resource Exploration Lt. Co., Qujing 655000, China;
2. 317 Team, Bureau of Nonferrous Metal Geology of Yunnan Province, Qujing 655000, China;
3. State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002, China;
4. Henan Institute of Geological Survey, Zhengzhou 450001，China)
Abstract: Dulong Sn-Zn polymetallic ore deposit, Maguan area, Yunnan Province, China is one of most important producing areas of Sn and Zn resource in China, and its wall rock alteration is dominated by skarn. Vesuvianit, being ignored by researchers, has been discovered during recent geological exploring. The mineral occurs in the transition part between anhydrous skarn and hydrous skarn, belonging to the product in hydrous skarn stage, and is relate closely to Zn-Cu mineralization. It is suggested that vesuvianit is a prospecting indicator for Zn-Cu. Researched by LA-ICP-MS, it shows that vesuvianit is rich in Zn, Sn, W and Bi; those ore-forming elements replace Mg2+ and Fe2+ in the crystal lattice of vesuvianit, and present as isomorphism, implying that the ore-forming fluid is rich in metallogenic elements during hydrous skarn stage, which is beneficial to the mineralization. Furthermore, the chondrite-normalized REE patterns of vesuvianit belong to the LREE- rich type, and Y/Ho ratio value is between 22.3 and 34.4, corresponding to that of Later Yanshanian concealed granite, and suggesting that the formation of vesuvianit is related closely to the rock mass.
Keywords: Vesuvianit; Skarn mineral; LA-ICP-MS; Metallogenic element; Dulong
ACTA MINERALOGICA SINICA Vol. 36, No. 4, 2016, Page 529-534
