地质与勘探2011，Vol.47Issue(2)：170-179,10.
滇西北衙金多金属矿床成矿地球化学特征
Geochemical Characteristics of Metallogenesis in the Gold-Polymetallic Deposit in Beiya, Western Yunnan Province
摘要
Abstract
The Beiya gold-polymetallic deposit is one of the typical deposits related to Cenozoic alkali-rich porphyry along the Jingsha River-Ailaoshan-Red river fault system in western Yunnan Province. This presents measurements on the trace elements of fluid inclusions and S-Pb isotopes of ores,and discusses the characteristics of ore-forming fluids and the material sources of ore formation. The results show that the total REE abundance is relatively low, with a range from 5. 19 to 9.0×10-6, whilst LREE/HREE and (La/Yb)N reflecting fraction between LREE and HREE vary from 4.121 to 11.249 and from 9.563 to 17.651, respectively. The distribution patterns of REE display a LREE-enriched trend, which is roughly consistent with that of alkali-rich porphyries. The δ34 S values are in the range of -2.4 ～ 4.5‰ and the 208Pb/2O4 Pb, 207 Pb/204Pb and 206Pb/2O4 Pb values range from 38.256 to 39.0394, from 15.457 to 15.703, and from 18.380 to 18.673, respectively. There is no obvious variation in the suffur and lead isotopic composition for different sulfides ( pyrite, galena and chalcopyrite) from different ore blocks, and the S-Pb isotopic compositions are also very similar to that of alkali-rich porphyries. In combination with the previous studies of fluid inclusions, it could be concluded that alkali-rich porphyry magma not only provides a driving force and heat for the risc of ore-beating fluids, but also acts as the main source and carrier for the ore-forming material and mineralization fluid.关键词
金多金属矿/稀土微量元素/硫、铅同位素/滇西北衙Key words
gold polymetallie deposit/ trace elements and rare earth elements/ sulfur and lead isotope/ Beiya in western Yunnan分类
天文与地球科学引用本文复制引用
肖晓牛,喻学惠,莫宣学,李勇,黄行凯..滇西北衙金多金属矿床成矿地球化学特征[J].地质与勘探,2011,47(2):170-179,10.基金项目
国家重点基础研发发展规划项目《三江岩浆作用与壳幔交换成矿制约》编号:2009CB42100及自然科学基金(编号:40972049,40572046). （编号:40972049,40572046）
