论文摘要
Northwest Guizhou is located in the southwestern margin of Yangtze Plate, which is an important part of the Sichuan-Yunnan-Guizhou（SYG） Pb-Zn metallogenic province（Hu R Z,2016）. More than 140 lead-zinc deposits have been discovered（Jin, 2016）. The Fulaichang Pb-Zn deposit is located in the southwest of Jiangzishan-Mangdong lead-zinc metallogenic belt in Northwest Guizhou, and is one of the Pb-Zn deposits representatives of the NW-trending Ziyun-Yadu fault zone. Faults are well developed, and the NWW-NE-trending faults together constitute the tectonic framework of "chessboard structure " in the mining area. In addition, a small number of SN and EW-trending faults are developed, and secondary folds are developed in the surrounding rocks beside the footwall of NWtrending faults. The exposure strata in the mining area are mainly Carboniferous, followed by the Permian, and the ore bodies are all present in the coarse-grained dolomite in the third member of the Upper Carboniferous Huanglong Formation（C2h）. The mineralization-alteration fine measurement is carried out by using the FLD8 section of the tunnel as a typical representative（Han R S, 2016）, and the characteristics of altered mineral type, color, symbiotic combination, alteration intensity, and fabric are summarized. The main alteration types are dolomitization, calcitization and pyritization. Mineralization mainly includes sphalerite and galena. It is found that mineralization-alteration has obvious zonation in space, from the surrounding rock to the ore body, there exists calcite-dolomitization zone（Ⅰ）, strong pyritization-dolomitization zone（Ⅱ）, lead-zinc mineralizationstrong calcification zone（Ⅲ）, lead-zinc ore zone（Ⅳ）. Lead-zinc mineralization and alteration strength are gradually enhanced, and dolomitization is most closely related to mineralization. The migration amoun of main elements（Wang, 2008） and the mineralization-alteration index（Haeussinger H, 1993） in each mineralization-alteration zones are calculated to determine the regularity of mineralization-alteration zoning and the degree of mineralization-alteration. The research may show as follows: 1) Based on the variation of major elements and Pb and Zn elements in the mineralization-alteration zones, it is considered that during the migration process from the original rock to Ⅰ zone, Ⅰ to Ⅱ zone, Ⅱ to Ⅲ zone, such elements as Zn、Pb、TFe、MgO, which have a close relationship with ore-forming of Zn-Pb, migrate in as a whole. Meanwile, both iron and Pro iron elements markedly enriched accompanying by the oreformingfluids elements,which indicates that different alteration facies were reformed by the hydrothermal fluids.Among them, the stage of Ⅱ to Ⅲ is the main enrichment alteration stage of each element. 2) The value of the mineralization-alteration index（MAI） was positively correlated with the intensity of mineralization-alteration, with high mineralization-alteration index, strong alteration and strong mineralization. This study con
论文目录
文章来源
类型: 国际会议
作者: ZHOU Xuanling,HAN Runsheng,CHENG Chen
来源: 第九届世界华人地质科学研讨会 2019-06-01
年度: 2019
分类: 基础科学,工程科技Ⅰ辑
专业: 地质学,矿业工程
单位: Kunming University of Science and TechnologySouthwest Institute of Geological Survey, Geological Survey Center for Non-ferrous Metals Resources
分类号: P618.4
DOI: 10.26914/c.cnkihy.2019.028525
页码: 435-436
总页数: 2
文件大小: 59k
下载量: 4