地质通报2017，Vol.36Issue(7)：1294-1304,11.
云南禄劝噜鲁铅锌矿床铷-锶同位素年代学与硫、铅同位素地球化学特征
Rb-Sr isotopic geochronology and geochemical characteristics of S and Pb iso?topes of the Lulu Pb-Zn deposit in Luquan, Yunnan Province
摘要
Abstract
The Lulu Pb-Zn deposit is located on the western margin of Yangtze Block and is hosted in the dolostone of Cambrian Meishucun Formation. Ore minerals are mainly galena, sphalerite and pyrite, Gangue minerals are mainly quartz, calcite and barite. The 87Sr/86Sr ratios of sulfides are 0.7112~0.7115, indicating that the ore-forming materials were derived from basements. Rb-Sr iso?chron age of sphalerite is 223.5 ± 2.9Ma, suggesting Late Indosinian to Early Yanshanian period. The δ34S ratios of S isotope of sul?fides in the deposit range from 9.72‰ to 22.44‰. The δ34S values of S isotope of barite in the deposit range from 26.08‰ to 29.34‰. These data suggest that the reduced sulfur in the ore-forming fluids was the product of thermo-chemical sulfate reduction. The range of 206Pb/204Pb, 207Pb/204Pb and 208Pb/204Pb are respectively from 18.259 to 18.342, from 15.608 to 15.639, and from 38.460 to 38.821. Pb isotope compositions lie in the region between the upper crust and the orogenic Pb area and fall into the field of base?ment rocks, which indicates that the crust source of ore-forming metals was mainly supplied by basement rocks. All the geological and geochemical information shows that the source of ore-forming metals and the fluid of the Lulu Pb-Zn deposit were the mixed products derived mainly from basement strata. The mineralization was caused by strong driving force of Indosinian movement, which prompted activation, migration, mixture and spatial emplacement of the ore-containing basement strata with ore-forming elements, thus forming industrial deposit.关键词
矿床地质特征/成矿物质/S-Pb同位素/Rb-Sr同位素/成矿机制/噜鲁铅锌矿床Key words
geological characteristics/source of ore-forming metals/S-Pb isotopes/Rb-Sr isotopic dating/metallogenic mecha⁃nism/Lulu Pb-Zn deposit分类
天文与地球科学引用本文复制引用
王文元,高建国,侬阳霞,陈欣彬..云南禄劝噜鲁铅锌矿床铷-锶同位素年代学与硫、铅同位素地球化学特征[J].地质通报,2017,36(7):1294-1304,11.基金项目
国家自然科学基金项目《滇中碳酸盐岩型铅锌矿床流体混合成矿机理研究》(批准号:41272111) （批准号:41272111）
